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Re: XQueryColor() failing on dual monitor system

Cross-posted to 2 groups.

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On 10/27/23 04:18, Muttley@dastardlyhq.com wrote:
> Hi
> 
> I'm hoping to write some code to save the contents of a window clicked on by
> the mouse to a file and my plan was to get its image, save the pixels then
> reload them into an image created by XCreateImage. However on one of the 3
> systems I'm using the XQueryColor() call fails in the following code (but never
> fails on the other 2). The only difference is the one it crashes on is a dual
> monitor system:
> 
> :
> :
>          screen = DefaultScreen(display);
>          cmap = DefaultColormap(display,screen);
> :
> :
>          win = event.xbutton.subwindow ?
>                event.xbutton.subwindow : event.xbutton.window;
> 
>          XGetWindowAttributes(display,win,&att);
>          printf("Window %ld, width = %d, height = %d\n",
>                  win,att.width,att.height);
> 
>          puts("Grabbing image...");
>          oldimg = XGetImage(
>                  display,win,
>                  0,0,att.width,att.height,AllPlanes,XYPixmap);
> 
>          puts("Pixels...");
>          for(x=0;x < att.width;++x)
>          {
>                  for(y=0;y < att.height;++y)
>                  {
>                          printf("X,Y = %d,%d\n",x,y);
>                          pixel = XGetPixel(oldimg,x,y);
>                          col.pixel = pixel;
>                          XQueryColor(display,cmap,&col);
> 
> 
> $ ./a.out
> Window 54532344, width = 786, height = 1037
> Grabbing image...
> Pixels...
> :
> :
> X,Y = 12,26
> X,Y = 12,27
> X,Y = 12,28
> X,Y = 12,29
> X,Y = 12,30
> X Error of failed request:  BadValue (integer parameter out of range for operati
> on)
>    Major opcode of failed request:  91 (X_QueryColors)
>    Value in failed request:  0x1000000
>    Serial number of failed request:  11
>    Current serial number in output stream:  11
> 
> 
> Is there some obvious mistake I'm making?
> 
> Thanks for any help
> 

You could always try looking at the source code for xcolor and copy that.
-- 
user <candycane> is generated from /dev/urandom

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XQueryColor() failing on dual monitor system Muttley@dastardlyhq.com - 2023-10-27 09:18 +0000
  Re: XQueryColor() failing on dual monitor system Marco Moock <mm+usenet-es@dorfdsl.de> - 2023-10-27 11:59 +0200
    Re: XQueryColor() failing on dual monitor system Muttley@dastardlyhq.com - 2023-10-27 14:51 +0000
      Re: XQueryColor() failing on dual monitor system scott@slp53.sl.home (Scott Lurndal) - 2023-10-27 15:57 +0000
        Re: XQueryColor() failing on dual monitor system Muttley@dastardlyhq.com - 2023-10-27 16:07 +0000
  Re: XQueryColor() failing on dual monitor system scott@slp53.sl.home (Scott Lurndal) - 2023-10-27 13:52 +0000
  Re: XQueryColor() failing on dual monitor system candycanearter07 <no@thanks.net> - 2023-10-28 19:17 -0500
  Re: XQueryColor() failing on dual monitor system Spiros Bousbouras <spibou@gmail.com> - 2023-10-29 13:28 +0000

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