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<HTML><HEAD><TITLE>Xlib Programming Manual: XGetGCValues</TITLE></HEAD><BODY><H1 ALIGN=center>XGetGCValues</H1><H2>Syntax</H2><!.IN "XGetGCValues" "" "@DEF@"><CODE><PRE><B><A HREF="../introduction/errors.html#Status">Status</A></B> XGetGCValues(<B>display</B>, <B>gc</B>, <B>valuemask</B>, <B>values_return</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; <A HREF="manipulating.html">GC</A> <B>gc</B>; unsigned long <B>valuemask</B>; <A HREF="manipulating.html#XGCValues">XGCValues</A> *<B>values_return</B>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>display</B><TD> Specifies the connection to the X server.<TR><TD> <B>gc</B><TD> Specifies the GC.<TR><TD> <B>valuemask</B><TD> Specifies which components in the GC are to be returned in the values_return argument. This argument is the bitwise inclusive OR of zero or more of the validGC component mask bits.<TR><TD> <B>values_return</B><TD> Returns the GC values in the specified<A HREF="manipulating.html#XGCValues">XGCValues</A> structure.</TABLE><H2>Description</H2>The<B>XGetGCValues()</B>function returns the components specified by valuemask for the specified GC.If the valuemask contains a valid set of GC mask bits(<B>GCFunction</B>,<B>GCPlaneMask</B>,<B>GCForeground</B>,<B>GCBackground</B>,<B>GCLineWidth</B>,<B>GCLineStyle</B>,<B>GCCapStyle</B>,<B>GCJoinStyle</B>,<B>GCFillStyle</B>,<B>GCFillRule</B>,<B>GCTile</B>,<B>GCStipple</B>,<B>GCTileStipXOrigin</B>,<B>GCTileStipYOrigin</B>,<B>GCFont</B>,<B>GCSubwindowMode</B>,<B>GCGraphicsExposures</B>,<B>GCClipXOrigin</B>,<B>GCCLipYOrigin</B>,<B>GCDashOffset</B>,or<B>GCArcMode</B>)and no error occurs,<B>XGetGCValues()</B>sets the requested components in values_return and returns a nonzero status.Otherwise, it returns a zero status.Note that the clip-mask and dash-list (represented by the<B>GCClipMask</B>and <B>GCDashList</B>bits, respectively, in the valuemask)cannot be requested.Also note that an invalid resource ID (with one or more of the threemost-significant bits set to 1) will be returned for<B>GCFont</B>,<B>GCTile</B>,and<B>GCStipple</B>if the component has never been explicitly set by the client.<H2>See also</H2><B><A HREF="../display/display-macros.html#AllPlanes">AllPlanes()</A></B>,<B><A HREF="XChangeGC.html">XChangeGC()</A></B>, <B><A HREF="../graphics/XCopyArea.html">XCopyArea()</A></B>,<B><A HREF="XCopyGC.html">XCopyGC()</A></B>, <B><A HREF="XCreateGC.html">XCreateGC()</A></B>,<B><A HREF="XCreateRegion.html">XCreateRegion()</A></B>,<B><A HREF="XDrawArc.html">XDrawArc()</A></B>,<B><A HREF="XDrawLine.html">XDrawLine()</A></B>,<B><A HREF="XDrawRectangle.html">XDrawRectangle()</A></B>,<B><A HREF="XDrawText.html">XDrawText()</A></B>,<B><A HREF="XFillRectangle.html">XFillRectangle()</A></B>,<B><A HREF="XFreeGC.html">XFreeGC()</A></B>, <B><A HREF="XGContextFromGC.html">XGContextFromGC()</A></B>,<B><A HREF="convenience-functions/XQueryBestSize.html">XQueryBestSize()</A></B>,<B><A HREF="convenience-functions/XSetArcMode.html">XSetArcMode()</A></B>,<B><A HREF="convenience-functions/XSetClipOrigin.html">XSetClipOrigin()</A></B>,"<A HREF="manipulating.html">Manipulating Graphics Context/State</A>".<HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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