XQueryColor(3X11)   X Version 11 (Release 4)    XQueryColor(3X11)



  NAME
       XQueryColor, XQueryColors, XLookupColor - obtain color
       values

  SYNTAX
       XQueryColor(display, colormap, def_in_out)
             Display *display;
             Colormap colormap;
             XColor *def_in_out;

       XQueryColors(display, colormap, defs_in_out, ncolors)
             Display *display;
             Colormap colormap;
             XColor defs_in_out[];
             int ncolors;

       Status XLookupColor(display, colormap, color_name,
       exact_def_return, screen_def_return)
             Display *display;
             Colormap colormap;
             char *color_name;
             XColor *exact_def_return, *screen_def_return;

  ARGUMENTS
       colormap  Specifies the colormap.

       color_name
                 Specifies the color name string (for example, red)
                 whose color definition structure you want
                 returned.

       def_in_out
                 Specifies and returns the RGB values for the pixel
                 specified in the structure.

       defs_in_out
                 Specifies and returns an array of color definition
                 structures for the pixel specified in the
                 structure.



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       display   Specifies the connection to the X server.

       exact_def_return
                 Returns the exact RGB values.

       ncolors   Specifies the number of XColor structures in the
                 color definition array.

       screen_def_return
                 Returns the closest RGB values provided by the
                 hardware.

  DESCRIPTION
       The XQueryColor function returns the hardware-specific RGB
       values for each pixel in the XColor structures and sets the
       DoRed, DoGreen, and DoBlue flags.  The XQueryColors function
       returns the RGB values for each pixel in the XColor
       structures and sets the DoRed, DoGreen, and DoBlue flags.

       XQueryColor and XQueryColors can generate BadColor and
       BadValue errors.

       The XLookupColor function looks up the string name of a
       color with respect to the screen associated with the
       specified colormap.  It returns both the exact color values
       and the closest values provided by the screen with respect
       to the visual type of the specified colormap.  You should
       use the ISO Latin-1 encoding; uppercase and lowercase do not
       matter.  XLookupColor returns nonzero if the name existed in
       the color database or zero if it did not exist.

  DIAGNOSTICS
       BadColor  A value for a Colormap argument does not name a
                 defined Colormap.

       BadValue  Some numeric value falls outside the range of
                 values accepted by the request.  Unless a specific
                 range is specified for an argument, the full range
                 defined by the argument's type is accepted.  Any
                 argument defined as a set of alternatives can


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                 generate this error.

  SEE ALSO
       XAllocColor(3X11), XCreateColormap(3X11), XStoreColors(3X11)
       Xlib - C Language X Interface





































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