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QImageIOHandler
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com.trolltech.qt.gui</FONT>
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Class QImageIOHandler</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../com/trolltech/qt/QSignalEmitter.html" title="class in com.trolltech.qt">com.trolltech.qt.QSignalEmitter</A>
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<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../com/trolltech/qt/QtJambiInterface.html" title="interface in com.trolltech.qt">QtJambiInterface</A></DD>
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<DT><PRE>public abstract class <B>QImageIOHandler</B><DT>extends <A HREF="../../../../com/trolltech/qt/QtJambiObject.html" title="class in com.trolltech.qt">QtJambiObject</A></DL>
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<P>
<p>The <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> class defines the common image I/O interface for all image formats in Qt.</p>
<p>Qt uses <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> for reading and writing images through <a href="QImageReader.html"><tt>QImageReader</tt></a> and <a href="QImageWriter.html"><tt>QImageWriter</tt></a>. You can also derive from this class to write your own image format handler using Qt's plugin mechanism.</p>
<p>Call <a href="QImageIOHandler.html#setDevice(com.trolltech.qt.core.QIODevice)"><tt>setDevice</tt></a> to assign a device to the handler, and <a href="QImageIOHandler.html#setFormat(com.trolltech.qt.core.QByteArray)"><tt>setFormat</tt></a> to assign a format to it. One <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> may support more than one image format. <a href="QImageIOHandler.html#canRead()"><tt>canRead</tt></a> returns true if an image can be read from the device, and <a href="QImageIOHandler.html#read(com.trolltech.qt.gui.QImage)"><tt>read</tt></a> and <a href="QImageIOHandler.html#write(com.trolltech.qt.gui.QImage)"><tt>write</tt></a> return true if reading or writing an image was completed successfully.</p>
<p><a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> also has support for animations formats, through the functions <a href="QImageIOHandler.html#loopCount()"><tt>loopCount</tt></a>, <a href="QImageIOHandler.html#imageCount()"><tt>imageCount</tt></a>, <a href="QImageIOHandler.html#nextImageDelay()"><tt>nextImageDelay</tt></a> and <a href="QImageIOHandler.html#currentImageNumber()"><tt>currentImageNumber</tt></a>.</p>
<p>In order to determine what options an image handler supports, Qt will call <a href="QImageIOHandler.html#supportsOption(com.trolltech.qt.gui.QImageIOHandler.ImageOption)"><tt>supportsOption</tt></a> and <a href="QImageIOHandler.html#setOption(com.trolltech.qt.gui.QImageIOHandler.ImageOption, java.lang.Object)"><tt>setOption</tt></a>. Make sure to reimplement these functions if you can provide support for any of the options in the <a href="QImageIOHandler.html#ImageOption-enum"><tt>ImageOption</tt></a> enum.</p>
<p>To write your own image handler, you must at least reimplement <a href="QImageIOHandler.html#canRead()"><tt>canRead</tt></a> and <a href="QImageIOHandler.html#read(com.trolltech.qt.gui.QImage)"><tt>read</tt></a>. Then create a QImageIOPlugin that can create the handler. Finally, install your plugin, and <a href="QImageReader.html"><tt>QImageReader</tt></a> and <a href="QImageWriter.html"><tt>QImageWriter</tt></a> will then automatically load the plugin, and start using it.</p>
<P>
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<DL>
<DT><B>See Also:</B><DD><tt>QImageIOPlugin</tt>,
<a href="QImageReader.html"><tt>QImageReader</tt></a>,
<a href="QImageWriter.html"><tt>QImageWriter</tt></a></DL>
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<CODE>static class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.ImageOption.html" title="enum in com.trolltech.qt.gui">QImageIOHandler.ImageOption</A></B></CODE>
<BR>
This enum describes the different options supported by <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a>.</TD>
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<TD><CODE><A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal0.html" title="class in com.trolltech.qt">QSignalEmitter.Signal0</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal1.html" title="class in com.trolltech.qt">QSignalEmitter.Signal1</A><<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal1.html" title="type parameter in QSignalEmitter.Signal1">A</A>>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal2.html" title="class in com.trolltech.qt">QSignalEmitter.Signal2</A><<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal2.html" title="type parameter in QSignalEmitter.Signal2">A</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal2.html" title="type parameter in QSignalEmitter.Signal2">B</A>>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal3.html" title="class in com.trolltech.qt">QSignalEmitter.Signal3</A><<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal3.html" title="type parameter in 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QSignalEmitter.Signal7">C</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">D</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">E</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">F</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal7.html" title="type parameter in QSignalEmitter.Signal7">G</A>>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="class in com.trolltech.qt">QSignalEmitter.Signal8</A><<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in QSignalEmitter.Signal8">A</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in QSignalEmitter.Signal8">B</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal8.html" title="type parameter in 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QSignalEmitter.Signal9">B</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">C</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">D</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">E</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">F</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">G</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">H</A>,<A HREF="../../../../com/trolltech/qt/QSignalEmitter.Signal9.html" title="type parameter in QSignalEmitter.Signal9">I</A>></CODE></TD>
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<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#QImageIOHandler()">QImageIOHandler</A></B>()</CODE>
<BR>
Constructs a <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> object.</TD>
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<CODE>abstract boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#canRead()">canRead</A></B>()</CODE>
<BR>
Returns true if an image can be read from the device (i.e., the image format is supported, the device can be read from and the initial header information suggests that the image can be read); otherwise returns false.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#currentImageNumber()">currentImageNumber</A></B>()</CODE>
<BR>
For image formats that support animation, this function returns the sequence number of the current image in the animation.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/trolltech/qt/core/QRect.html" title="class in com.trolltech.qt.core">QRect</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#currentImageRect()">currentImageRect</A></B>()</CODE>
<BR>
Returns the rect of the current image.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/trolltech/qt/core/QIODevice.html" title="class in com.trolltech.qt.core">QIODevice</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#device()">device</A></B>()</CODE>
<BR>
Returns the device currently assigned to the <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a>.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/trolltech/qt/core/QByteArray.html" title="class in com.trolltech.qt.core">QByteArray</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#format()">format</A></B>()</CODE>
<BR>
Returns the format that is currently assigned to <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a>.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html" title="class in com.trolltech.qt.gui">QImageIOHandler</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#fromNativePointer(com.trolltech.qt.QNativePointer)">fromNativePointer</A></B>(<A HREF="../../../../com/trolltech/qt/QNativePointer.html" title="class in com.trolltech.qt">QNativePointer</A> nativePointer)</CODE>
<BR>
This function returns the QImageIOHandler instance pointed to by nativePointer</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#imageCount()">imageCount</A></B>()</CODE>
<BR>
For image formats that support animation, this function returns the number of images in the animation.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#jumpToImage(int)">jumpToImage</A></B>(int imageNumber)</CODE>
<BR>
For image formats that support animation, this function jumps to the image whose sequence number is <tt>imageNumber</tt>.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#jumpToNextImage()">jumpToNextImage</A></B>()</CODE>
<BR>
For image formats that support animation, this function jumps to the next image.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#loopCount()">loopCount</A></B>()</CODE>
<BR>
For image formats that support animation, this function returns the number of times the animation should loop.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#nextImageDelay()">nextImageDelay</A></B>()</CODE>
<BR>
For image formats that support animation, this function returns the number of milliseconds to wait until reading the next image.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#option(com.trolltech.qt.gui.QImageIOHandler.ImageOption)">option</A></B>(<A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.ImageOption.html" title="enum in com.trolltech.qt.gui">QImageIOHandler.ImageOption</A> option)</CODE>
<BR>
Returns the value assigned to <tt>option</tt> as a <a href="%2E%2E/porting4.html#qvariant"><tt>QVariant</tt></a>.</TD>
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<CODE>abstract boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#read(com.trolltech.qt.gui.QImage)">read</A></B>(<A HREF="../../../../com/trolltech/qt/gui/QImage.html" title="class in com.trolltech.qt.gui">QImage</A> image)</CODE>
<BR>
Read an image from the device, and stores it in <tt>image</tt>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#setDevice(com.trolltech.qt.core.QIODevice)">setDevice</A></B>(<A HREF="../../../../com/trolltech/qt/core/QIODevice.html" title="class in com.trolltech.qt.core">QIODevice</A> device)</CODE>
<BR>
Sets the device of the <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> to <tt>device</tt>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#setFormat(com.trolltech.qt.core.QByteArray)">setFormat</A></B>(<A HREF="../../../../com/trolltech/qt/core/QByteArray.html" title="class in com.trolltech.qt.core">QByteArray</A> format)</CODE>
<BR>
Sets the format of the <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> to <tt>format</tt>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#setOption(com.trolltech.qt.gui.QImageIOHandler.ImageOption, java.lang.Object)">setOption</A></B>(<A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.ImageOption.html" title="enum in com.trolltech.qt.gui">QImageIOHandler.ImageOption</A> option,
java.lang.Object value)</CODE>
<BR>
Sets the option <tt>option</tt> with the value <tt>value</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#supportsOption(com.trolltech.qt.gui.QImageIOHandler.ImageOption)">supportsOption</A></B>(<A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.ImageOption.html" title="enum in com.trolltech.qt.gui">QImageIOHandler.ImageOption</A> option)</CODE>
<BR>
Returns true if the <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> supports the option <tt>option</tt>; otherwise returns false.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html#write(com.trolltech.qt.gui.QImage)">write</A></B>(<A HREF="../../../../com/trolltech/qt/gui/QImage.html" title="class in com.trolltech.qt.gui">QImage</A> image)</CODE>
<BR>
Writes the image <tt>image</tt> to the assigned device.</TD>
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<A NAME="methods_inherited_from_class_com.trolltech.qt.QtJambiObject"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class com.trolltech.qt.<A HREF="../../../../com/trolltech/qt/QtJambiObject.html" title="class in com.trolltech.qt">QtJambiObject</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/trolltech/qt/QtJambiObject.html#dispose()">dispose</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#disposed()">disposed</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#finalize()">finalize</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#reassignNativeResources(com.trolltech.qt.QtJambiObject, java.lang.Class)">reassignNativeResources</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#tr(java.lang.String)">tr</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#tr(java.lang.String, java.lang.String)">tr</A>, <A HREF="../../../../com/trolltech/qt/QtJambiObject.html#tr(java.lang.String, java.lang.String, int)">tr</A></CODE></TD>
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<A NAME="methods_inherited_from_class_com.trolltech.qt.QSignalEmitter"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class com.trolltech.qt.<A HREF="../../../../com/trolltech/qt/QSignalEmitter.html" title="class in com.trolltech.qt">QSignalEmitter</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#blockSignals(boolean)">blockSignals</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#disconnect()">disconnect</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#disconnect(java.lang.Object)">disconnect</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#signalsBlocked()">signalsBlocked</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#signalSender()">signalSender</A>, <A HREF="../../../../com/trolltech/qt/QSignalEmitter.html#thread()">thread</A></CODE></TD>
</TR>
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<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_com.trolltech.qt.QtJambiInterface"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from interface com.trolltech.qt.<A HREF="../../../../com/trolltech/qt/QtJambiInterface.html" title="interface in com.trolltech.qt">QtJambiInterface</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../com/trolltech/qt/QtJambiInterface.html#disableGarbageCollection()">disableGarbageCollection</A>, <A HREF="../../../../com/trolltech/qt/QtJambiInterface.html#nativeId()">nativeId</A>, <A HREF="../../../../com/trolltech/qt/QtJambiInterface.html#nativePointer()">nativePointer</A>, <A HREF="../../../../com/trolltech/qt/QtJambiInterface.html#reenableGarbageCollection()">reenableGarbageCollection</A>, <A HREF="../../../../com/trolltech/qt/QtJambiInterface.html#setJavaOwnership()">setJavaOwnership</A></CODE></TD>
</TR>
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<P>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<B>Constructor Detail</B></FONT></TH>
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<A NAME="QImageIOHandler()"><!-- --></A><H3>
QImageIOHandler</H3>
<PRE>
public <B>QImageIOHandler</B>()</PRE>
<DL>
<DD><p>Constructs a <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> object.</p>
<P>
</DL>
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<B>Method Detail</B></FONT></TH>
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<A NAME="device()"><!-- --></A><H3>
device</H3>
<PRE>
public final <A HREF="../../../../com/trolltech/qt/core/QIODevice.html" title="class in com.trolltech.qt.core">QIODevice</A> <B>device</B>()</PRE>
<DL>
<DD><p>Returns the device currently assigned to the <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a>. If not device has been assigned, 0 is returned.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QImageIOHandler.html#setDevice(com.trolltech.qt.core.QIODevice)"><tt>setDevice</tt></a></DL>
</DD>
</DL>
<HR>
<A NAME="format()"><!-- --></A><H3>
format</H3>
<PRE>
public final <A HREF="../../../../com/trolltech/qt/core/QByteArray.html" title="class in com.trolltech.qt.core">QByteArray</A> <B>format</B>()</PRE>
<DL>
<DD><p>Returns the format that is currently assigned to <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a>. If no format has been assigned, an empty string is returned.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QImageIOHandler.html#setFormat(com.trolltech.qt.core.QByteArray)"><tt>setFormat</tt></a></DL>
</DD>
</DL>
<HR>
<A NAME="setDevice(com.trolltech.qt.core.QIODevice)"><!-- --></A><H3>
setDevice</H3>
<PRE>
public final void <B>setDevice</B>(<A HREF="../../../../com/trolltech/qt/core/QIODevice.html" title="class in com.trolltech.qt.core">QIODevice</A> device)</PRE>
<DL>
<DD><p>Sets the device of the <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> to <tt>device</tt>. The image handler will use this device when reading and writing images.</p>
<p>The device can only be set once and must be set before calling <a href="QImageIOHandler.html#canRead()"><tt>canRead</tt></a>, <a href="QImageIOHandler.html#read(com.trolltech.qt.gui.QImage)"><tt>read</tt></a>, <a href="QImageIOHandler.html#write(com.trolltech.qt.gui.QImage)"><tt>write</tt></a>, etc. If you need to read multiple files, construct multiple instances of the appropriate <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> subclass.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QImageIOHandler.html#device()"><tt>device</tt></a></DL>
</DD>
</DL>
<HR>
<A NAME="setFormat(com.trolltech.qt.core.QByteArray)"><!-- --></A><H3>
setFormat</H3>
<PRE>
public final void <B>setFormat</B>(<A HREF="../../../../com/trolltech/qt/core/QByteArray.html" title="class in com.trolltech.qt.core">QByteArray</A> format)</PRE>
<DL>
<DD><p>Sets the format of the <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> to <tt>format</tt>. The format is most useful for handlers that support multiple image formats.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QImageIOHandler.html#format()"><tt>format</tt></a></DL>
</DD>
</DL>
<HR>
<A NAME="canRead()"><!-- --></A><H3>
canRead</H3>
<PRE>
public abstract boolean <B>canRead</B>()</PRE>
<DL>
<DD><p>Returns true if an image can be read from the device (i.e., the image format is supported, the device can be read from and the initial header information suggests that the image can be read); otherwise returns false.</p>
<p>When reimplementing <a href="QImageIOHandler.html#canRead()"><tt>canRead</tt></a>, make sure that the I/O device (<a href="QImageIOHandler.html#device()"><tt>device</tt></a>) is left in its original state (e.g., by using peek() rather than <a href="QImageIOHandler.html#read(com.trolltech.qt.gui.QImage)"><tt>read</tt></a>).</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QImageIOHandler.html#read(com.trolltech.qt.gui.QImage)"><tt>read</tt></a>,
<tt>QIODevice::peek</tt></DL>
</DD>
</DL>
<HR>
<A NAME="currentImageNumber()"><!-- --></A><H3>
currentImageNumber</H3>
<PRE>
public int <B>currentImageNumber</B>()</PRE>
<DL>
<DD><p>For image formats that support animation, this function returns the sequence number of the current image in the animation. If the image format does not support animation, or if it is unable to determine the current sequence number, 0 is returned.</p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="currentImageRect()"><!-- --></A><H3>
currentImageRect</H3>
<PRE>
public <A HREF="../../../../com/trolltech/qt/core/QRect.html" title="class in com.trolltech.qt.core">QRect</A> <B>currentImageRect</B>()</PRE>
<DL>
<DD><p>Returns the rect of the current image. If no rect is defined for the image, and empty QRect() is returned.</p>
<p>This function is useful for animations, where only parts of the frame may be updated at a time.</p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="imageCount()"><!-- --></A><H3>
imageCount</H3>
<PRE>
public int <B>imageCount</B>()</PRE>
<DL>
<DD><p>For image formats that support animation, this function returns the number of images in the animation. If the image format does not support animation, or if it is unable to determine the number of images, 0 is returned.</p>
<p>The default implementation returns 1 if <a href="QImageIOHandler.html#canRead()"><tt>canRead</tt></a> returns true; otherwise 0 is returned.</p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="jumpToImage(int)"><!-- --></A><H3>
jumpToImage</H3>
<PRE>
public boolean <B>jumpToImage</B>(int imageNumber)</PRE>
<DL>
<DD><p>For image formats that support animation, this function jumps to the image whose sequence number is <tt>imageNumber</tt>. The next call to <a href="QImageIOHandler.html#read(com.trolltech.qt.gui.QImage)"><tt>read</tt></a> will attempt to read this image.</p>
<p>The default implementation does nothing, and returns false.</p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="jumpToNextImage()"><!-- --></A><H3>
jumpToNextImage</H3>
<PRE>
public boolean <B>jumpToNextImage</B>()</PRE>
<DL>
<DD><p>For image formats that support animation, this function jumps to the next image.</p>
<p>The default implementation does nothing, and returns false.</p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="loopCount()"><!-- --></A><H3>
loopCount</H3>
<PRE>
public int <B>loopCount</B>()</PRE>
<DL>
<DD><p>For image formats that support animation, this function returns the number of times the animation should loop. If the image format does not support animation, 0 is returned.</p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="nextImageDelay()"><!-- --></A><H3>
nextImageDelay</H3>
<PRE>
public int <B>nextImageDelay</B>()</PRE>
<DL>
<DD><p>For image formats that support animation, this function returns the number of milliseconds to wait until reading the next image. If the image format does not support animation, 0 is returned.</p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="option(com.trolltech.qt.gui.QImageIOHandler.ImageOption)"><!-- --></A><H3>
option</H3>
<PRE>
public java.lang.Object <B>option</B>(<A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.ImageOption.html" title="enum in com.trolltech.qt.gui">QImageIOHandler.ImageOption</A> option)</PRE>
<DL>
<DD><p>Returns the value assigned to <tt>option</tt> as a <a href="%2E%2E/porting4.html#qvariant"><tt>QVariant</tt></a>. The type of the value depends on the option. For example, option(Size) returns a <a href="%2E%2E/core/QSize.html"><tt>QSize</tt></a> variant.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QImageIOHandler.html#setOption(com.trolltech.qt.gui.QImageIOHandler.ImageOption, java.lang.Object)"><tt>setOption</tt></a>,
<a href="QImageIOHandler.html#supportsOption(com.trolltech.qt.gui.QImageIOHandler.ImageOption)"><tt>supportsOption</tt></a></DL>
</DD>
</DL>
<HR>
<A NAME="read(com.trolltech.qt.gui.QImage)"><!-- --></A><H3>
read</H3>
<PRE>
public abstract boolean <B>read</B>(<A HREF="../../../../com/trolltech/qt/gui/QImage.html" title="class in com.trolltech.qt.gui">QImage</A> image)</PRE>
<DL>
<DD><p>Read an image from the device, and stores it in <tt>image</tt>. Returns true if the image is successfully read; otherwise returns false.</p>
<p>For image formats that support incremental loading, and for animation formats, the image handler can assume that <tt>image</tt> points to the previous frame.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QImageIOHandler.html#canRead()"><tt>canRead</tt></a></DL>
</DD>
</DL>
<HR>
<A NAME="setOption(com.trolltech.qt.gui.QImageIOHandler.ImageOption, java.lang.Object)"><!-- --></A><H3>
setOption</H3>
<PRE>
public void <B>setOption</B>(<A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.ImageOption.html" title="enum in com.trolltech.qt.gui">QImageIOHandler.ImageOption</A> option,
java.lang.Object value)</PRE>
<DL>
<DD><p>Sets the option <tt>option</tt> with the value <tt>value</tt>.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QImageIOHandler.html#option(com.trolltech.qt.gui.QImageIOHandler.ImageOption)"><tt>option</tt></a>,
<a href="QImageIOHandler.html#ImageOption-enum"><tt>ImageOption</tt></a></DL>
</DD>
</DL>
<HR>
<A NAME="supportsOption(com.trolltech.qt.gui.QImageIOHandler.ImageOption)"><!-- --></A><H3>
supportsOption</H3>
<PRE>
public boolean <B>supportsOption</B>(<A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.ImageOption.html" title="enum in com.trolltech.qt.gui">QImageIOHandler.ImageOption</A> option)</PRE>
<DL>
<DD><p>Returns true if the <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> supports the option <tt>option</tt>; otherwise returns false. For example, if the <a href="QImageIOHandler.html#QImageIOHandler()"><tt>QImageIOHandler</tt></a> supports the <a href="QImageIOHandler.html#ImageOption-enum">Size</tt></a> option, <a href="QImageIOHandler.html#supportsOption(com.trolltech.qt.gui.QImageIOHandler.ImageOption)"><tt>supportsOption</tt></a>(Size) must return true.</p>
<P>
<DD><DL>
<DT><B>See Also:</B><DD><a href="QImageIOHandler.html#setOption(com.trolltech.qt.gui.QImageIOHandler.ImageOption, java.lang.Object)"><tt>setOption</tt></a>,
<a href="QImageIOHandler.html#option(com.trolltech.qt.gui.QImageIOHandler.ImageOption)"><tt>option</tt></a></DL>
</DD>
</DL>
<HR>
<A NAME="write(com.trolltech.qt.gui.QImage)"><!-- --></A><H3>
write</H3>
<PRE>
public boolean <B>write</B>(<A HREF="../../../../com/trolltech/qt/gui/QImage.html" title="class in com.trolltech.qt.gui">QImage</A> image)</PRE>
<DL>
<DD><p>Writes the image <tt>image</tt> to the assigned device. Returns true on success; otherwise returns false.</p>
<p>The default implementation does nothing, and simply returns false.</p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="fromNativePointer(com.trolltech.qt.QNativePointer)"><!-- --></A><H3>
fromNativePointer</H3>
<PRE>
public static <A HREF="../../../../com/trolltech/qt/gui/QImageIOHandler.html" title="class in com.trolltech.qt.gui">QImageIOHandler</A> <B>fromNativePointer</B>(<A HREF="../../../../com/trolltech/qt/QNativePointer.html" title="class in com.trolltech.qt">QNativePointer</A> nativePointer)</PRE>
<DL>
<DD>This function returns the QImageIOHandler instance pointed to by nativePointer
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>nativePointer</CODE> - the QNativePointer of which object should be returned.</DL>
</DD>
</DL>
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