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141 lines
2.9 KiB
141 lines
2.9 KiB
15 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title>KSquirrel: development</title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name='Author' content='Baryshev Dmitry/Krasu'>
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<link rel="stylesheet" href="styles.css" type="text/css">
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</head>
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<body>
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For reading and writing data I use the following classes, inherited from ifstream and ofstream.
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<table cellpadding="2" cellspacing="2" width="70%" align="center">
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<tbody>
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<tr>
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<td valign="top" bgcolor="#CCCCCC">
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<pre>
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<b>Class for reading binary data</b>
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class ifstreamK : public ifstream
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{
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public:
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ifstreamK();
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<b>Read 'size' bytes of binary data and store it into 'data'.
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Returns true if reading was successful, and false otherwise</b>
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bool readK(void *data, int size);
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<b>Read string from file</b>
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bool getS(char *, const int);
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<b>Read ascii hex value from file (like "0xFFFF00")</b>
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bool readCHex(u32 &hex);
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<b>big-endian-oriented reading</b>
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bool be_getchar(u8 *c);
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bool be_getshort(u16 *s);
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bool be_getlong(u32 *l);
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};
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<b>Class for writing binary data</b>
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class ofstreamK : public ofstream
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{
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public:
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ofstreamK();
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bool writeK(void *data, int size);
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};
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</pre>
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</td>
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</tr>
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</tbody>
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</table>
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<b><u>Examples</u></b>
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<ul>
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<li> Read structure from binary file
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<br><br>
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<table cellpadding="2" cellspacing="2" width="70%" align="center">
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<tbody>
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<tr>
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<td valign="top" bgcolor="#CCCCCC">
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<pre>
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typedef struct
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{
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int a;
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short b;
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char c;
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}Data;
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...
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class::class()
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{
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fs.open("file.bin", ios::in | ios::binary);
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}
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int class::readstruct(Data *s)
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{
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bool b = fs.readK(s, sizeof(Data));
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cerr << "Reading " << (b ? "OK" : "Failed") << endl;
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}
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</pre>
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</td>
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</tr>
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</tbody>
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</table>
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<br><br>
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<li> Write structure to binary file
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<br><br>
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<table cellpadding="2" cellspacing="2" width="70%" align="center">
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<tbody>
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<tr>
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<td valign="top" bgcolor="#CCCCCC">
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<pre>
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typedef struct
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{
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int a;
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short b;
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char c;
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}Data;
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...
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class::class()
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{
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fs.open("file.bin", ios::out | ios::binary);
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}
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int class::writestruct(Data *s)
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{
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bool b = fs.writeK(s, sizeof(Data));
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cerr << "Writing " << (b ? "OK" : "Failed") << endl;
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}
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</pre>
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</td>
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</tr>
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</tbody>
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</table>
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<br>
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<b><u>Note:</u></b> remember, that reading and writing structures in binary mode is not doog idea. This is just example. See <a href='http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#7'>http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#7</a> and <a href='http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#3'>http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#3</a> for more.
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<br><br>
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</ul>
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</body>
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</html>
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