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594 lines
37 KiB
594 lines
37 KiB
13 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/network/qhttp.cpp:1010 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQHttp Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQHttp Class Reference<br><small>[<a href="network.html">network module</a>]</small></h1>
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<p>The TQHttp class provides an implementation of the HTTP protocol.
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<a href="#details">More...</a>
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13 years ago
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<p><tt>#include <<a href="qhttp-h.html">ntqhttp.h</a>></tt>
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<p>Inherits <a href="ntqnetworkprotocol.html">TQNetworkProtocol</a>.
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<p><a href="qhttp-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQHttp"><b>TQHttp</b></a> ()</li>
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<li class=fn><a href="#TQHttp-2"><b>TQHttp</b></a> ( TQObject * parent, const char * name = 0 )</li>
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<li class=fn><a href="#TQHttp-3"><b>TQHttp</b></a> ( const TQString & hostname, Q_UINT16 port = 80, TQObject * parent = 0, const char * name = 0 )</li>
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<li class=fn>virtual <a href="#~TQHttp"><b>~TQHttp</b></a> ()</li>
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<li class=fn>enum <a href="#State-enum"><b>State</b></a> { Unconnected, HostLookup, Connecting, Sending, Reading, Connected, Closing }</li>
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<li class=fn>enum <a href="#Error-enum"><b>Error</b></a> { NoError, UnknownError, HostNotFound, ConnectionRefused, UnexpectedClose, InvalidResponseHeader, WrongContentLength, Aborted }</li>
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<li class=fn>int <a href="#setHost"><b>setHost</b></a> ( const TQString & hostname, Q_UINT16 port = 80 )</li>
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<li class=fn>int <a href="#get"><b>get</b></a> ( const TQString & path, TQIODevice * to = 0 )</li>
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<li class=fn>int <a href="#post"><b>post</b></a> ( const TQString & path, TQIODevice * data, TQIODevice * to = 0 )</li>
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<li class=fn>int <a href="#post-2"><b>post</b></a> ( const TQString & path, const TQByteArray & data, TQIODevice * to = 0 )</li>
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<li class=fn>int <a href="#head"><b>head</b></a> ( const TQString & path )</li>
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<li class=fn>int <a href="#request"><b>request</b></a> ( const TQHttpRequestHeader & header, TQIODevice * data = 0, TQIODevice * to = 0 )</li>
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<li class=fn>int <a href="#request-2"><b>request</b></a> ( const TQHttpRequestHeader & header, const TQByteArray & data, TQIODevice * to = 0 )</li>
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<li class=fn>int <a href="#closeConnection"><b>closeConnection</b></a> ()</li>
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<li class=fn>Q_ULONG <a href="#bytesAvailable"><b>bytesAvailable</b></a> () const</li>
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<li class=fn>Q_LONG <a href="#readBlock"><b>readBlock</b></a> ( char * data, Q_ULONG maxlen )</li>
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<li class=fn>TQByteArray <a href="#readAll"><b>readAll</b></a> ()</li>
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<li class=fn>int <a href="#currentId"><b>currentId</b></a> () const</li>
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<li class=fn>TQIODevice * <a href="#currentSourceDevice"><b>currentSourceDevice</b></a> () const</li>
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<li class=fn>TQIODevice * <a href="#currentDestinationDevice"><b>currentDestinationDevice</b></a> () const</li>
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<li class=fn>TQHttpRequestHeader <a href="#currentRequest"><b>currentRequest</b></a> () const</li>
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<li class=fn>bool <a href="#hasPendingRequests"><b>hasPendingRequests</b></a> () const</li>
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<li class=fn>void <a href="#clearPendingRequests"><b>clearPendingRequests</b></a> ()</li>
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<li class=fn>State <a href="#state"><b>state</b></a> () const</li>
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<li class=fn>Error <a href="#error"><b>error</b></a> () const</li>
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<li class=fn>TQString <a href="#errorString"><b>errorString</b></a> () const</li>
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</ul>
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<h2>Public Slots</h2>
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<ul>
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<li class=fn>void <a href="#abort"><b>abort</b></a> ()</li>
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</ul>
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<h2>Signals</h2>
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<ul>
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<li class=fn>void <a href="#stateChanged"><b>stateChanged</b></a> ( int state )</li>
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<li class=fn>void <a href="#responseHeaderReceived"><b>responseHeaderReceived</b></a> ( const TQHttpResponseHeader & resp )</li>
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<li class=fn>void <a href="#readyRead"><b>readyRead</b></a> ( const TQHttpResponseHeader & resp )</li>
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<li class=fn>void <a href="#dataSendProgress"><b>dataSendProgress</b></a> ( int done, int total )</li>
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<li class=fn>void <a href="#dataReadProgress"><b>dataReadProgress</b></a> ( int done, int total )</li>
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<li class=fn>void <a href="#requestStarted"><b>requestStarted</b></a> ( int id )</li>
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<li class=fn>void <a href="#requestFinished"><b>requestFinished</b></a> ( int id, bool error )</li>
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<li class=fn>void <a href="#done"><b>done</b></a> ( bool error )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQHttp class provides an implementation of the HTTP protocol.
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<p>
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<p> This class provides two different interfaces: one is the
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<a href="ntqnetworkprotocol.html">TQNetworkProtocol</a> interface that allows you to use HTTP through the
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<a href="ntqurloperator.html">TQUrlOperator</a> abstraction. The other is a direct interface to HTTP
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that allows you to have more control over the requests and that
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allows you to access the response header fields.
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<p> Don't mix the two interfaces, since the behavior is not
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well-defined.
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<p> If you want to use TQHttp with the TQNetworkProtocol interface, you
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do not use it directly, but rather through a TQUrlOperator, for
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example:
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<p> <pre>
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<a href="ntqurloperator.html">TQUrlOperator</a> op( "http://www.trolltech.com" );
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op.<a href="ntqurloperator.html#get">get</a>( "index.html" );
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13 years ago
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</pre>
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<p> This code will only work if the TQHttp class is registered; to
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register the class, you must call <a href="ntqurloperator.html#qInitNetworkProtocols">qInitNetworkProtocols</a>() before
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using a TQUrlOperator with HTTP.
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<p> The TQNetworkProtocol interface for HTTP only supports the
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operations <a href="ntqnetworkprotocol.html#operationGet">operationGet</a>() and <a href="ntqnetworkprotocol.html#operationPut">operationPut</a>(), i.e.
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<a href="ntqurloperator.html#get">TQUrlOperator::get</a>() and <a href="ntqurloperator.html#put">TQUrlOperator::put</a>(), if you use it with a
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<a href="ntqurloperator.html">TQUrlOperator</a>.
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<p> The rest of this descrption describes the direct interface to
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HTTP.
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<p> The class works asynchronously, so there are no blocking
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functions. If an operation cannot be executed immediately, the
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function will still return straight away and the operation will be
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scheduled for later execution. The results of scheduled operations
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are reported via signals. This approach depends on the event loop
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being in operation.
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<p> The operations that can be scheduled (they are called "requests"
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in the rest of the documentation) are the following: <a href="#setHost">setHost</a>(),
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<a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#head">head</a>() and <a href="#request">request</a>().
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<p> All of these requests return a unique identifier that allows you
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to keep track of the request that is currently executed. When the
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execution of a request starts, the <a href="#requestStarted">requestStarted</a>() signal with
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the identifier is emitted and when the request is finished, the
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<a href="#requestFinished">requestFinished</a>() signal is emitted with the identifier and a bool
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that indicates if the request finished with an error.
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<p> To make an HTTP request you must set up suitable HTTP headers. The
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following example demonstrates, how to request the main HTML page
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from the Trolltech home page (i.e. the URL
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http://www.trolltech.com/index.html):
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<p> <pre>
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<a href="qhttprequestheader.html">TQHttpRequestHeader</a> header( "GET", "/index.html" );
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header.<a href="qhttpheader.html#setValue">setValue</a>( "Host", "www.trolltech.com" );
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http->setHost( "www.trolltech.com" );
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http->request( header );
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</pre>
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<p> For the common HTTP requests <tt>GET</tt>, <tt>POST</tt> and <tt>HEAD</tt>, TQHttp
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provides the convenience functions <a href="#get">get</a>(), <a href="#post">post</a>() and <a href="#head">head</a>(). They
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already use a reasonable header and if you don't have to set
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special header fields, they are easier to use. The above example
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can also be written as:
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<p> <pre>
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http->setHost( "www.trolltech.com" ); // id == 1
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http->get( "/index.html" ); // id == 2
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</pre>
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<p> For this example the following sequence of signals is emitted
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(with small variations, depending on network traffic, etc.):
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<p> <pre>
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<a href="#requestStarted">requestStarted</a>( 1 )
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<a href="#requestFinished">requestFinished</a>( 1, FALSE )
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<a href="#requestStarted">requestStarted</a>( 2 )
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<a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Connecting</a> )
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<a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Sending</a> )
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<a href="#dataSendProgress">dataSendProgress</a>( 77, 77 )
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<a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Reading</a> )
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<a href="#responseHeaderReceived">responseHeaderReceived</a>( responseheader )
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<a href="#dataReadProgress">dataReadProgress</a>( 5388, 0 )
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<a href="#readyRead">readyRead</a>( responseheader )
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<a href="#dataReadProgress">dataReadProgress</a>( 18300, 0 )
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<a href="#readyRead">readyRead</a>( responseheader )
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<a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Connected</a> )
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<a href="#requestFinished">requestFinished</a>( 2, FALSE )
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<a href="#done">done</a>( FALSE )
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<a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Closing</a> )
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<a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Unconnected</a> )
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</pre>
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<p> The <a href="#dataSendProgress">dataSendProgress</a>() and <a href="#dataReadProgress">dataReadProgress</a>() signals in the above
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example are useful if you want to show a <a href="ntqprogressbar.html">progressbar</a> to inform the user about the progress of the
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download. The second argument is the total size of data. In
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certain cases it is not possible to know the total amount in
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advance, in which case the second argument is 0. (If you connect
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to a <a href="ntqprogressbar.html">TQProgressBar</a> a total of 0 results in a busy indicator.)
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<p> When the response header is read, it is reported with the
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<a href="#responseHeaderReceived">responseHeaderReceived</a>() signal.
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<p> The <a href="#readyRead">readyRead</a>() signal tells you that there is data ready to be
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read. The amount of data can then be queried with the
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<a href="#bytesAvailable">bytesAvailable</a>() function and it can be read with the <a href="#readBlock">readBlock</a>()
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or <a href="#readAll">readAll</a>() functions.
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<p> If an error occurs during the execution of one of the commands in
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a sequence of commands, all the pending commands (i.e. scheduled,
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but not yet executed commands) are cleared and no signals are
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emitted for them.
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<p> For example, if you have the following sequence of reqeusts
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<p> <pre>
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http->setHost( "www.foo.bar" ); // id == 1
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http->get( "/index.html" ); // id == 2
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http->post( "register.html", data ); // id == 3
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</pre>
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<p> and the <a href="#get">get</a>() request fails because the host lookup fails, then
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the <a href="#post">post</a>() request is never executed and the signals would look
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like this:
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<p> <pre>
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<a href="#requestStarted">requestStarted</a>( 1 )
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<a href="#requestFinished">requestFinished</a>( 1, FALSE )
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<a href="#requestStarted">requestStarted</a>( 2 )
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<a href="#stateChanged">stateChanged</a>( <a href="#State-enum">HostLookup</a> )
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<a href="#requestFinished">requestFinished</a>( 2, TRUE )
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<a href="#done">done</a>( TRUE )
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<a href="#stateChanged">stateChanged</a>( <a href="#State-enum">Unconnected</a> )
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</pre>
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<p> You can then get details about the error with the <a href="#error">error</a>() and
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<a href="#errorString">errorString</a>() functions. Note that only unexpected behaviour, like
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network failure is considered as an error. If the server response
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contains an error status, like a 404 response, this is reported as
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a normal response case. So you should always check the <a href="qhttpresponseheader.html#statusCode">status code</a> of the
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response header.
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<p> The functions <a href="#currentId">currentId</a>() and <a href="#currentRequest">currentRequest</a>() provide more
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information about the currently executing request.
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<p> The functions <a href="#hasPendingRequests">hasPendingRequests</a>() and <a href="#clearPendingRequests">clearPendingRequests</a>()
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allow you to query and clear the list of pending requests.
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<p> <p>See also <a href="network.html">TQt Network Documentation</a>, <a href="ntqnetworkprotocol.html">TQNetworkProtocol</a>, <a href="ntqurloperator.html">TQUrlOperator</a>, <a href="ntqftp.html">TQFtp</a>, and <a href="io.html">Input/Output and Networking</a>.
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13 years ago
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="Error-enum"></a>TQHttp::Error</h3>
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<p> This enum identifies the error that occurred.
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<ul>
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<li><tt>TQHttp::NoError</tt> - No error occurred.
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<li><tt>TQHttp::HostNotFound</tt> - The host name lookup failed.
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<li><tt>TQHttp::ConnectionRefused</tt> - The server refused the connection.
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<li><tt>TQHttp::UnexpectedClose</tt> - The server closed the connection unexpectedly.
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<li><tt>TQHttp::InvalidResponseHeader</tt> - The server sent an invalid response header.
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<li><tt>TQHttp::WrongContentLength</tt> - The client could not read the content correctly
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because an error with respect to the content length occurred.
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<li><tt>TQHttp::Aborted</tt> - The request was aborted with <a href="#abort">abort</a>().
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<li><tt>TQHttp::UnknownError</tt> - An error other than those specified above
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occurred.
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</ul><p> <p>See also <a href="#error">error</a>().
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<h3 class=fn><a name="State-enum"></a>TQHttp::State</h3>
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<p> This enum is used to specify the state the client is in:
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<ul>
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<li><tt>TQHttp::Unconnected</tt> - There is no connection to the host.
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<li><tt>TQHttp::HostLookup</tt> - A host name lookup is in progress.
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<li><tt>TQHttp::Connecting</tt> - An attempt to connect to the host is in progress.
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<li><tt>TQHttp::Sending</tt> - The client is sending its request to the server.
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<li><tt>TQHttp::Reading</tt> - The client's request has been sent and the client
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is reading the server's response.
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|
|
<li><tt>TQHttp::Connected</tt> - The connection to the host is open, but the client is
|
||
|
|
neither sending a request, nor waiting for a response.
|
||
|
|
<li><tt>TQHttp::Closing</tt> - The connection is closing down, but is not yet
|
||
|
|
closed. (The state will be <a href="#State-enum">Unconnected</a> when the connection is
|
||
|
|
closed.)
|
||
|
|
</ul><p> <p>See also <a href="#stateChanged">stateChanged</a>() and <a href="#state">state</a>().
|
||
|
|
|
||
|
|
<hr><h2>Member Function Documentation</h2>
|
||
|
|
<h3 class=fn><a name="TQHttp"></a>TQHttp::TQHttp ()
|
||
|
|
</h3>
|
||
|
|
Constructs a TQHttp object.
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a name="TQHttp-2"></a>TQHttp::TQHttp ( <a href="ntqobject.html">TQObject</a> * parent, const char * name = 0 )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Constructs a TQHttp object. The parameters <em>parent</em> and <em>name</em>
|
||
|
13 years ago
|
are passed on to the <a href="ntqobject.html">TQObject</a> constructor.
|
||
|
13 years ago
|
|
||
|
13 years ago
|
<h3 class=fn><a name="TQHttp-3"></a>TQHttp::TQHttp ( const <a href="ntqstring.html">TQString</a> & hostname, Q_UINT16 port = 80, <a href="ntqobject.html">TQObject</a> * parent = 0, const char * name = 0 )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Constructs a TQHttp object. Subsequent requests are done by
|
||
|
|
connecting to the server <em>hostname</em> on port <em>port</em>. The
|
||
|
13 years ago
|
parameters <em>parent</em> and <em>name</em> are passed on to the <a href="ntqobject.html">TQObject</a>
|
||
|
13 years ago
|
constructor.
|
||
|
|
<p> <p>See also <a href="#setHost">setHost</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a name="~TQHttp"></a>TQHttp::~TQHttp ()<tt> [virtual]</tt>
|
||
|
|
</h3>
|
||
|
|
Destroys the TQHttp object. If there is an open connection, it is
|
||
|
|
closed.
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="abort"></a>TQHttp::abort ()<tt> [slot]</tt>
|
||
|
|
</h3>
|
||
|
|
Aborts the current request and deletes all scheduled requests.
|
||
|
|
<p> For the current request, the <a href="#requestFinished">requestFinished</a>() signal with the <tt>error</tt> argument <tt>TRUE</tt> is emitted. For all other requests that are
|
||
|
|
affected by the <a href="#abort">abort</a>(), no signals are emitted.
|
||
|
|
<p> Since this slot also deletes the scheduled requests, there are no
|
||
|
|
requests left and the <a href="#done">done</a>() signal is emitted (with the <tt>error</tt>
|
||
|
|
argument <tt>TRUE</tt>).
|
||
|
|
<p> <p>See also <a href="#clearPendingRequests">clearPendingRequests</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>Q_ULONG <a name="bytesAvailable"></a>TQHttp::bytesAvailable () const
|
||
|
|
</h3>
|
||
|
|
Returns the number of bytes that can be read from the response
|
||
|
|
content at the moment.
|
||
|
|
<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), <a href="#readyRead">readyRead</a>(), <a href="#readBlock">readBlock</a>(), and <a href="#readAll">readAll</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="clearPendingRequests"></a>TQHttp::clearPendingRequests ()
|
||
|
|
</h3>
|
||
|
|
Deletes all pending requests from the list of scheduled requests.
|
||
|
|
This does not affect the request that is being executed. If
|
||
|
|
you want to stop this this as well, use <a href="#abort">abort</a>().
|
||
|
|
<p> <p>See also <a href="#hasPendingRequests">hasPendingRequests</a>() and <a href="#abort">abort</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="closeConnection"></a>TQHttp::closeConnection ()
|
||
|
|
</h3>
|
||
|
|
Closes the connection; this is useful if you have a keep-alive
|
||
|
|
connection and want to close it.
|
||
|
|
<p> For the requests issued with <a href="#get">get</a>(), <a href="#post">post</a>() and <a href="#head">head</a>(), TQHttp sets
|
||
|
|
the connection to be keep-alive. You can also do this using the
|
||
|
|
header you pass to the <a href="#request">request</a>() function. TQHttp only closes the
|
||
|
13 years ago
|
connection to the HTTP server if the response header requires it
|
||
|
13 years ago
|
to do so.
|
||
|
|
<p> The function does not block and returns immediately. The request
|
||
|
|
is scheduled, and its execution is performed asynchronously. The
|
||
|
|
function returns a unique identifier which is passed by
|
||
|
|
<a href="#requestStarted">requestStarted</a>() and <a href="#requestFinished">requestFinished</a>().
|
||
|
|
<p> When the request is started the requestStarted() signal is
|
||
|
|
emitted. When it is finished the requestFinished() signal is
|
||
|
|
emitted.
|
||
|
|
<p> If you want to close the connection immediately, you have to use
|
||
|
|
<a href="#abort">abort</a>() instead.
|
||
|
|
<p> <p>See also <a href="#stateChanged">stateChanged</a>(), <a href="#abort">abort</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqiodevice.html">TQIODevice</a> * <a name="currentDestinationDevice"></a>TQHttp::currentDestinationDevice () const
|
||
|
13 years ago
|
</h3>
|
||
|
13 years ago
|
Returns the <a href="ntqiodevice.html">TQIODevice</a> pointer that is used as to store the data of the HTTP
|
||
|
13 years ago
|
request being executed. If there is no current request or if the request
|
||
|
|
does not store the data to an IO device, this function returns 0.
|
||
|
|
<p> This function can be used to delete the TQIODevice in the slot connected to
|
||
|
|
the <a href="#requestFinished">requestFinished</a>() signal.
|
||
|
|
<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), and <a href="#request">request</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="currentId"></a>TQHttp::currentId () const
|
||
|
|
</h3>
|
||
|
|
Returns the identifier of the HTTP request being executed or 0 if
|
||
|
|
there is no request being executed (i.e. they've all finished).
|
||
|
|
<p> <p>See also <a href="#currentRequest">currentRequest</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qhttprequestheader.html">TQHttpRequestHeader</a> <a name="currentRequest"></a>TQHttp::currentRequest () const
|
||
|
|
</h3>
|
||
|
|
Returns the request header of the HTTP request being executed. If
|
||
|
|
the request is one issued by <a href="#setHost">setHost</a>() or <a href="#closeConnection">closeConnection</a>(), it
|
||
|
|
returns an invalid request header, i.e.
|
||
|
|
<a href="qhttpheader.html#isValid">TQHttpRequestHeader::isValid</a>() returns FALSE.
|
||
|
|
<p> <p>See also <a href="#currentId">currentId</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqiodevice.html">TQIODevice</a> * <a name="currentSourceDevice"></a>TQHttp::currentSourceDevice () const
|
||
|
13 years ago
|
</h3>
|
||
|
13 years ago
|
Returns the <a href="ntqiodevice.html">TQIODevice</a> pointer that is used as the data source of the HTTP
|
||
|
13 years ago
|
request being executed. If there is no current request or if the request
|
||
|
|
does not use an IO device as the data source, this function returns 0.
|
||
|
|
<p> This function can be used to delete the TQIODevice in the slot connected to
|
||
|
|
the <a href="#requestFinished">requestFinished</a>() signal.
|
||
|
|
<p> <p>See also <a href="#currentDestinationDevice">currentDestinationDevice</a>(), <a href="#post">post</a>(), and <a href="#request">request</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="dataReadProgress"></a>TQHttp::dataReadProgress ( int done, int total )<tt> [signal]</tt>
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> This signal is emitted when this object reads data from a HTTP
|
||
|
|
server to indicate the current progress of the download.
|
||
|
|
<p> <em>done</em> is the amount of data that has already arrived and <em>total</em> is the total amount of data. It is possible that the total
|
||
|
|
amount of data that should be transferred cannot be determined, in
|
||
|
13 years ago
|
which case <em>total</em> is 0.(If you connect to a <a href="ntqprogressbar.html">TQProgressBar</a>, the
|
||
|
13 years ago
|
progress bar shows a busy indicator if the total is 0).
|
||
|
|
<p> <b>Warning:</b> <em>done</em> and <em>total</em> are not necessarily the size in
|
||
|
|
bytes, since for large files these values might need to be
|
||
|
|
"scaled" to avoid overflow.
|
||
|
13 years ago
|
<p> <p>See also <a href="#dataSendProgress">dataSendProgress</a>(), <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), and <a href="ntqprogressbar.html#progress-prop">TQProgressBar::progress</a>.
|
||
|
13 years ago
|
|
||
|
|
<h3 class=fn>void <a name="dataSendProgress"></a>TQHttp::dataSendProgress ( int done, int total )<tt> [signal]</tt>
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> This signal is emitted when this object sends data to a HTTP
|
||
|
|
server to inform it about the progress of the upload.
|
||
|
|
<p> <em>done</em> is the amount of data that has already arrived and <em>total</em> is the total amount of data. It is possible that the total
|
||
|
|
amount of data that should be transferred cannot be determined, in
|
||
|
13 years ago
|
which case <em>total</em> is 0.(If you connect to a <a href="ntqprogressbar.html">TQProgressBar</a>, the
|
||
|
13 years ago
|
progress bar shows a busy indicator if the total is 0).
|
||
|
|
<p> <b>Warning:</b> <em>done</em> and <em>total</em> are not necessarily the size in
|
||
|
|
bytes, since for large files these values might need to be
|
||
|
|
"scaled" to avoid overflow.
|
||
|
13 years ago
|
<p> <p>See also <a href="#dataReadProgress">dataReadProgress</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), and <a href="ntqprogressbar.html#progress-prop">TQProgressBar::progress</a>.
|
||
|
13 years ago
|
|
||
|
|
<h3 class=fn>void <a name="done"></a>TQHttp::done ( bool error )<tt> [signal]</tt>
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> This signal is emitted when the last pending request has finished;
|
||
|
|
(it is emitted after the last request's <a href="#requestFinished">requestFinished</a>() signal).
|
||
|
|
<em>error</em> is TRUE if an error occurred during the processing;
|
||
|
|
otherwise <em>error</em> is FALSE.
|
||
|
|
<p> <p>See also <a href="#requestFinished">requestFinished</a>(), <a href="#error">error</a>(), and <a href="#errorString">errorString</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqhttp.html#Error-enum">Error</a> <a name="error"></a>TQHttp::error () const
|
||
|
13 years ago
|
</h3>
|
||
|
|
Returns the last error that occurred. This is useful to find out
|
||
|
|
what happened when receiving a <a href="#requestFinished">requestFinished</a>() or a <a href="#done">done</a>()
|
||
|
|
signal with the <tt>error</tt> argument <tt>TRUE</tt>.
|
||
|
|
<p> If you start a new request, the error status is reset to <a href="#Error-enum">NoError</a>.
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="errorString"></a>TQHttp::errorString () const
|
||
|
13 years ago
|
</h3>
|
||
|
|
Returns a human-readable description of the last error that
|
||
|
|
occurred. This is useful to present a error message to the user
|
||
|
|
when receiving a <a href="#requestFinished">requestFinished</a>() or a <a href="#done">done</a>() signal with the <tt>error</tt> argument <tt>TRUE</tt>.
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>int <a name="get"></a>TQHttp::get ( const <a href="ntqstring.html">TQString</a> & path, <a href="ntqiodevice.html">TQIODevice</a> * to = 0 )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Sends a get request for <em>path</em> to the server set by <a href="#setHost">setHost</a>() or
|
||
|
|
as specified in the constructor.
|
||
|
|
<p> <em>path</em> must be an absolute path like <tt>/index.html</tt> or an
|
||
|
|
absolute URI like <a href="http://www.trolltech.com/index.html">http://www.trolltech.com/index.html</a>.
|
||
|
|
<p> If the IO device <em>to</em> is 0 the <a href="#readyRead">readyRead</a>() signal is emitted
|
||
|
|
every time new content data is available to read.
|
||
|
|
<p> If the IO device <em>to</em> is not 0, the content data of the response
|
||
|
|
is written directly to the device. Make sure that the <em>to</em>
|
||
|
|
pointer is valid for the duration of the operation (it is safe to
|
||
|
|
delete it when the <a href="#requestFinished">requestFinished</a>() signal is emitted).
|
||
|
|
<p> The function does not block and returns immediately. The request
|
||
|
|
is scheduled, and its execution is performed asynchronously. The
|
||
|
|
function returns a unique identifier which is passed by
|
||
|
|
<a href="#requestStarted">requestStarted</a>() and requestFinished().
|
||
|
|
<p> When the request is started the requestStarted() signal is
|
||
|
|
emitted. When it is finished the requestFinished() signal is
|
||
|
|
emitted.
|
||
|
|
<p> <p>See also <a href="#setHost">setHost</a>(), <a href="#post">post</a>(), <a href="#head">head</a>(), <a href="#request">request</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="hasPendingRequests"></a>TQHttp::hasPendingRequests () const
|
||
|
|
</h3>
|
||
|
|
Returns TRUE if there are any requests scheduled that have not yet
|
||
|
|
been executed; otherwise returns FALSE.
|
||
|
|
<p> The request that is being executed is <em>not</em> considered as a
|
||
|
|
scheduled request.
|
||
|
|
<p> <p>See also <a href="#clearPendingRequests">clearPendingRequests</a>(), <a href="#currentId">currentId</a>(), and <a href="#currentRequest">currentRequest</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>int <a name="head"></a>TQHttp::head ( const <a href="ntqstring.html">TQString</a> & path )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Sends a header request for <em>path</em> to the server set by <a href="#setHost">setHost</a>()
|
||
|
|
or as specified in the constructor.
|
||
|
|
<p> <em>path</em> must be an absolute path like <tt>/index.html</tt> or an
|
||
|
|
absolute URI like <a href="http://www.trolltech.com/index.html">http://www.trolltech.com/index.html</a>.
|
||
|
|
<p> The function does not block and returns immediately. The request
|
||
|
|
is scheduled, and its execution is performed asynchronously. The
|
||
|
|
function returns a unique identifier which is passed by
|
||
|
|
<a href="#requestStarted">requestStarted</a>() and <a href="#requestFinished">requestFinished</a>().
|
||
|
|
<p> When the request is started the requestStarted() signal is
|
||
|
|
emitted. When it is finished the requestFinished() signal is
|
||
|
|
emitted.
|
||
|
|
<p> <p>See also <a href="#setHost">setHost</a>(), <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>int <a name="post"></a>TQHttp::post ( const <a href="ntqstring.html">TQString</a> & path, <a href="ntqiodevice.html">TQIODevice</a> * data, <a href="ntqiodevice.html">TQIODevice</a> * to = 0 )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Sends a post request for <em>path</em> to the server set by <a href="#setHost">setHost</a>() or
|
||
|
|
as specified in the constructor.
|
||
|
|
<p> <em>path</em> must be an absolute path like <tt>/index.html</tt> or an
|
||
|
|
absolute URI like <a href="http://www.trolltech.com/index.html">http://www.trolltech.com/index.html</a>.
|
||
|
|
<p> The incoming data comes via the <em>data</em> IO device.
|
||
|
|
<p> If the IO device <em>to</em> is 0 the <a href="#readyRead">readyRead</a>() signal is emitted
|
||
|
|
every time new content data is available to read.
|
||
|
|
<p> If the IO device <em>to</em> is not 0, the content data of the response
|
||
|
|
is written directly to the device. Make sure that the <em>to</em>
|
||
|
|
pointer is valid for the duration of the operation (it is safe to
|
||
|
|
delete it when the <a href="#requestFinished">requestFinished</a>() signal is emitted).
|
||
|
|
<p> The function does not block and returns immediately. The request
|
||
|
|
is scheduled, and its execution is performed asynchronously. The
|
||
|
|
function returns a unique identifier which is passed by
|
||
|
|
<a href="#requestStarted">requestStarted</a>() and requestFinished().
|
||
|
|
<p> When the request is started the requestStarted() signal is
|
||
|
|
emitted. When it is finished the requestFinished() signal is
|
||
|
|
emitted.
|
||
|
|
<p> <p>See also <a href="#setHost">setHost</a>(), <a href="#get">get</a>(), <a href="#head">head</a>(), <a href="#request">request</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>int <a name="post-2"></a>TQHttp::post ( const <a href="ntqstring.html">TQString</a> & path, const <a href="qbytearray.html">TQByteArray</a> & data, <a href="ntqiodevice.html">TQIODevice</a> * to = 0 )
|
||
|
13 years ago
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> <em>data</em> is used as the content data of the HTTP request.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qbytearray.html">TQByteArray</a> <a name="readAll"></a>TQHttp::readAll ()
|
||
|
|
</h3>
|
||
|
|
Reads all the bytes from the response content and returns them.
|
||
|
|
<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), <a href="#readyRead">readyRead</a>(), <a href="#bytesAvailable">bytesAvailable</a>(), and <a href="#readBlock">readBlock</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>Q_LONG <a name="readBlock"></a>TQHttp::readBlock ( char * data, Q_ULONG maxlen )
|
||
|
|
</h3>
|
||
|
|
Reads <em>maxlen</em> bytes from the response content into <em>data</em> and
|
||
|
|
returns the number of bytes read. Returns -1 if an error occurred.
|
||
|
|
<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), <a href="#readyRead">readyRead</a>(), <a href="#bytesAvailable">bytesAvailable</a>(), and <a href="#readAll">readAll</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="readyRead"></a>TQHttp::readyRead ( const <a href="qhttpresponseheader.html">TQHttpResponseHeader</a> & resp )<tt> [signal]</tt>
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> This signal is emitted when there is new response data to read.
|
||
|
|
<p> If you specified a device in the request where the data should be
|
||
|
|
written to, then this signal is <em>not</em> emitted; instead the data
|
||
|
|
is written directly to the device.
|
||
|
|
<p> The response header is passed in <em>resp</em>.
|
||
|
|
<p> You can read the data with the <a href="#readAll">readAll</a>() or <a href="#readBlock">readBlock</a>() functions
|
||
|
|
<p> This signal is useful if you want to process the data in chunks as
|
||
|
|
soon as it becomes available. If you are only interested in the
|
||
|
|
complete data, just connect to the <a href="#requestFinished">requestFinished</a>() signal and
|
||
|
|
read the data then instead.
|
||
|
|
<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#request">request</a>(), <a href="#readAll">readAll</a>(), <a href="#readBlock">readBlock</a>(), and <a href="#bytesAvailable">bytesAvailable</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>int <a name="request"></a>TQHttp::request ( const <a href="qhttprequestheader.html">TQHttpRequestHeader</a> & header, <a href="ntqiodevice.html">TQIODevice</a> * data = 0, <a href="ntqiodevice.html">TQIODevice</a> * to = 0 )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Sends a request to the server set by <a href="#setHost">setHost</a>() or as specified in
|
||
|
|
the constructor. Uses the <em>header</em> as the HTTP request header.
|
||
|
|
You are responsible for setting up a header that is appropriate
|
||
|
|
for your request.
|
||
|
|
<p> The incoming data comes via the <em>data</em> IO device.
|
||
|
|
<p> If the IO device <em>to</em> is 0 the <a href="#readyRead">readyRead</a>() signal is emitted
|
||
|
|
every time new content data is available to read.
|
||
|
|
<p> If the IO device <em>to</em> is not 0, the content data of the response
|
||
|
|
is written directly to the device. Make sure that the <em>to</em>
|
||
|
|
pointer is valid for the duration of the operation (it is safe to
|
||
|
|
delete it when the <a href="#requestFinished">requestFinished</a>() signal is emitted).
|
||
|
|
<p> The function does not block and returns immediately. The request
|
||
|
|
is scheduled, and its execution is performed asynchronously. The
|
||
|
|
function returns a unique identifier which is passed by
|
||
|
|
<a href="#requestStarted">requestStarted</a>() and requestFinished().
|
||
|
|
<p> When the request is started the requestStarted() signal is
|
||
|
|
emitted. When it is finished the requestFinished() signal is
|
||
|
|
emitted.
|
||
|
|
<p> <p>See also <a href="#setHost">setHost</a>(), <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#head">head</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>int <a name="request-2"></a>TQHttp::request ( const <a href="qhttprequestheader.html">TQHttpRequestHeader</a> & header, const <a href="qbytearray.html">TQByteArray</a> & data, <a href="ntqiodevice.html">TQIODevice</a> * to = 0 )
|
||
|
13 years ago
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> <em>data</em> is used as the content data of the HTTP request.
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="requestFinished"></a>TQHttp::requestFinished ( int id, bool error )<tt> [signal]</tt>
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> This signal is emitted when processing the request identified by
|
||
|
|
<em>id</em> has finished. <em>error</em> is TRUE if an error occurred during
|
||
|
|
the processing; otherwise <em>error</em> is FALSE.
|
||
|
|
<p> <p>See also <a href="#requestStarted">requestStarted</a>(), <a href="#done">done</a>(), <a href="#error">error</a>(), and <a href="#errorString">errorString</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="requestStarted"></a>TQHttp::requestStarted ( int id )<tt> [signal]</tt>
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> This signal is emitted when processing the request identified by
|
||
|
|
<em>id</em> starts.
|
||
|
|
<p> <p>See also <a href="#requestFinished">requestFinished</a>() and <a href="#done">done</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="responseHeaderReceived"></a>TQHttp::responseHeaderReceived ( const <a href="qhttpresponseheader.html">TQHttpResponseHeader</a> & resp )<tt> [signal]</tt>
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> This signal is emitted when the HTTP header of a server response
|
||
|
|
is available. The header is passed in <em>resp</em>.
|
||
|
|
<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#head">head</a>(), <a href="#request">request</a>(), and <a href="#readyRead">readyRead</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>int <a name="setHost"></a>TQHttp::setHost ( const <a href="ntqstring.html">TQString</a> & hostname, Q_UINT16 port = 80 )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Sets the HTTP server that is used for requests to <em>hostname</em> on
|
||
|
|
port <em>port</em>.
|
||
|
|
<p> The function does not block and returns immediately. The request
|
||
|
|
is scheduled, and its execution is performed asynchronously. The
|
||
|
|
function returns a unique identifier which is passed by
|
||
|
|
<a href="#requestStarted">requestStarted</a>() and <a href="#requestFinished">requestFinished</a>().
|
||
|
|
<p> When the request is started the requestStarted() signal is
|
||
|
|
emitted. When it is finished the requestFinished() signal is
|
||
|
|
emitted.
|
||
|
|
<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#head">head</a>(), <a href="#request">request</a>(), <a href="#requestStarted">requestStarted</a>(), <a href="#requestFinished">requestFinished</a>(), and <a href="#done">done</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqhttp.html#State-enum">State</a> <a name="state"></a>TQHttp::state () const
|
||
|
13 years ago
|
</h3>
|
||
|
|
Returns the current state of the object. When the state changes,
|
||
|
|
the <a href="#stateChanged">stateChanged</a>() signal is emitted.
|
||
|
|
<p> <p>See also <a href="#State-enum">State</a> and <a href="#stateChanged">stateChanged</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="stateChanged"></a>TQHttp::stateChanged ( int state )<tt> [signal]</tt>
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> This signal is emitted when the state of the TQHttp object changes.
|
||
|
|
The argument <em>state</em> is the new state of the connection; it is
|
||
|
|
one of the <a href="#State-enum">State</a> values.
|
||
|
|
<p> This usually happens when a request is started, but it can also
|
||
|
|
happen when the server closes the connection or when a call to
|
||
|
|
<a href="#closeConnection">closeConnection</a>() succeeded.
|
||
|
|
<p> <p>See also <a href="#get">get</a>(), <a href="#post">post</a>(), <a href="#head">head</a>(), <a href="#request">request</a>(), <a href="#closeConnection">closeConnection</a>(), <a href="#state">state</a>(), and <a href="#State-enum">State</a>.
|
||
|
|
|
||
|
|
<!-- eof -->
|
||
|
|
<hr><p>
|
||
|
|
This file is part of the <a href="index.html">TQt toolkit</a>.
|
||
|
|
Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|