qimageformattype.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/src/kernel/qasyncimageio.cpp:581 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QImageFormatType Class</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QImageFormatType Class Reference</h1><p>The QImageFormatType class is a factory that makes QImageFormat objects.<a href="#details">More...</a><p><tt>#include <<a href="qasyncimageio-h.html">qasyncimageio.h</a>></tt><p><a href="qimageformattype-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn>virtual <a href="#~QImageFormatType"><b>~QImageFormatType</b></a> ()</div></li><li><div class=fn>virtual QImageFormat * <a href="#decoderFor"><b>decoderFor</b></a> ( const uchar * buffer, int length ) = 0</div></li><li><div class=fn>virtual const char * <a href="#formatName"><b>formatName</b></a> () const = 0</div></li></ul><h2>Protected Members</h2><ul><li><div class=fn><a href="#QImageFormatType"><b>QImageFormatType</b></a> ()</div></li></ul><hr><a name="details"></a><h2>Detailed Description</h2>The QImageFormatType class is a factory that makes <a href="qimageformat.html">QImageFormat</a> objects.<p> <p> Whereas the <a href="qimageio.html">QImageIO</a> class allows for <em>complete</em> loading ofimages, QImageFormatType allows for <em>incremental</em> loading ofimages.<p> New image file formats are installed by creating objects ofderived classes of QImageFormatType. They must implement<a href="#decoderFor">decoderFor</a>() and <a href="#formatName">formatName</a>().<p> QImageFormatType is a very simple class. Its only task is torecognize image data in some format and make a new object,subclassed from QImageFormat, which can decode that format.<p> The factories for formats built into Qt are automatically definedbefore any other factory is initialized. If two factories wouldrecognize an image format, the factory created last will overridethe earlier one; you can thus override current and future built-informats.<p>See also <a href="graphics.html">Graphics Classes</a>, <a href="images.html">Image Processing Classes</a> and <a href="multimedia.html">Multimedia Classes</a>.<hr><h2>Member Function Documentation</h2><h3 class=fn><a name="QImageFormatType"></a>QImageFormatType::QImageFormatType ()<tt> [protected]</tt></h3>Constructs a factory. It automatically registers itself with<a href="qimagedecoder.html">QImageDecoder</a>.<h3 class=fn><a name="~QImageFormatType"></a>QImageFormatType::~QImageFormatType ()<tt> [virtual]</tt></h3>Destroys a factory. It automatically unregisters itself from<a href="qimagedecoder.html">QImageDecoder</a>.<h3 class=fn><a href="qimageformat.html">QImageFormat</a> * <a name="decoderFor"></a>QImageFormatType::decoderFor ( const uchar * buffer, int length )<tt> [pure virtual]</tt></h3><p> Returns a decoder for decoding an image that starts with the bytesin <em>buffer</em>. The length of the data is given in <em>length</em>. Thisfunction should only return a decoder if it is certain that thedecoder applies to data with the given header. Returns 0 if thereis insufficient data in the header to make a positiveidentification or if the data is not recognized.<h3 class=fn>const char * <a name="formatName"></a>QImageFormatType::formatName () const<tt> [pure virtual]</tt></h3><p> Returns the name of the format supported by decoders from thisfactory. The string is statically allocated.<!-- eof --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<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 © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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