xlookupcolor.html
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<HTML><HEAD><TITLE>Xlib Programming Manual: XLookupColor</TITLE></HEAD><BODY><H1 ALIGN=center>XLookupColor</H1><H2>Syntax</H2><!.IN "Color" "naming"><!.IN "XLookupColor" "" "@DEF@"><CODE><PRE><B><A HREF="../introduction/errors.html#Status">Status</A></B> XLookupColor(<B>display</B>, <B>colormap</B>, <B>color_name</B>, <B>exact_def_return</B>, <B>screen_def_return</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; <A HREF="./#colormap">Colormap</A> <B>colormap</B>; char *<B>color_name</B>; <A HREF="structures.html">XColor</A> *<B>exact_def_return</B>, *<B>screen_def_return</B>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>display</B><TD> Specifies the connection to the X server.<TR><TD> <B>colormap</B><TD> Specifies the colormap.<TR><TD> <B>color_name</B><TD> Specifies the color name string (for example, red) whose color definition structure you want returned.<TR><TD> <B>exact_def_return</B><TD> Returns the exact RGB values.<TR><TD> <B>screen_def_return</B><TD> Returns the closest RGB values provided by the hardware.</TABLE><H2>Description</H2>The<B>XLookupColor()</B>function looks up the string name of a color with respect to the screenassociated with the specified colormap.It returns both the exact color values andthe closest values provided by the screen with respect to the visual type of the specified colormap.If the color name is not in the Host Portable Character Encoding, the result is implementation dependent.Use of uppercase or lowercase does not matter.<B>XLookupColor()</B>returns nonzero if the name is resolved;otherwise, it returns zero.<P><B>XLookupColor()</B>can generate a<B>BadColor</B> error.<H2>Diagnostics</H2><TABLE><TR><TD><B>BadColor</B><TD> A value for a Colormap argument does not name a defined Colormap.</TABLE><H2>See also</H2><B><A HREF="XAllocColor.html">XAllocColor()</A></B>,<B><A HREF="XCreateColormap.html">XCreateColormap()</A></B>,<B><A HREF="XLookupColor.html">XLookupColor()</A></B>,<B><A HREF="XParseColor.html">XParseColor()</A></B>,<B><A HREF="XQueryColor.html">XQueryColor()</A></B>,<B><A HREF="XQueryColors.html">XQueryColors()</A></B>,<B><A HREF="XStoreColors.html">XStoreColors()</A></B>,"<A HREF="mapping-names-to-values.html">Mapping Color Names to Values</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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