XFixesFetchRegion() crashes app
My application attaches a XFixes created reactangle to a window.
Therefore it does a XOpenDisplay() + XFixesCreateRegion() +
XCloseDisplay() inside one short function and done.
After the above outlined function resturns a call to XFixesFetchRegion()
from a outside observer forces the application to quit:
PropertyNotify : _NET_COLOR_REGIONSv 679x580+642+245 2
X Error of failed request: 179
Major opcode of failed request: 155 (XFIXES)
Minor opcode of failed request: 19 (XFixesFetchRegion)
Serial number of failed request: 7927
Current serial number in output stream: 7927
Any idea how to avoid a quit from XFixesFetchRegion()? A error message
would be enough. A exit in not acceptable to the application.
A minimal example application source code is attached.
kind regards
Kai-Uwe Behrmann
--
developing for colour management
www.behrmann.name + www.oyranos.org
/* !cc -Wall -g -o test_XFixes test_XFixes.c -lXfixes -lX11 */
#include X11/Xlib.h
#include X11/extensions/Xfixes.h
#include stdio.h
int main(int argc, char * argv[])
{
Display * display = XOpenDisplay(0);
XRectangle rec[2] = { { 0,0,0,0 }, { 0,0,0,0 } },
* rect = 0;
int nRect = 0;
XserverRegion reg = 0;
rec[0].x = 10;
rec[0].y = 20;
rec[0].width = 30;
rec[0].height = 40;
reg = XFixesCreateRegion( display, rec, 1);
rect = XFixesFetchRegion( display, reg, nRect );
if(!nRect)
printf( no region to be found %d\n, (int)reg );
else
printf( rect found[%d]: %dx%d+%d+%d\n, (int)reg,
rect-width, rect-height, rect-x, rect-y );
XCloseDisplay( display ); display = 0;
printf( close display\n\n );
/* reopen */
printf( reopening display and fetching the same region[%d]\n\n, (int)reg );
display = XOpenDisplay(0);
nRect = 0;
rect = XFixesFetchRegion( display, reg, nRect );
if(!nRect)
printf( no region to be found %d\n, (int)reg );
else
printf( rect found: %dx%d+%d+%d\n,
rect-width, rect-height, rect-x, rect-y );
XCloseDisplay( display ); display = 0;
return 0;
}
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Re: XFixesFetchRegion() crashes app
Common sense (and the fact that the error says BadRegion here) suggest that reg = XFixesCreateRegion( display, rec, 1); This region number is no longer valid after you close the display. Doing this a 2nd time after setting nRect = 0 will fix it. Maarten. ___ xorg mailing list xorg@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/xorg
Re: XFixesFetchRegion() crashes app
Am 23.06.09, 11:35 +0200 schrieb Maarten Maathuis: Common sense (and the fact that the error says BadRegion here) suggest that reg = XFixesCreateRegion( display, rec, 1); This region number is no longer valid after you close the display. Doing this a 2nd time after setting nRect = 0 will fix it. Other than I expected XFixesCreateRegion()/XFixesFetchRegion() is not useful for inter application communication. Thanks for the quick answere. kind regards Kai-Uwe Behrmann -- developing for colour management www.behrmann.name + www.oyranos.org ___ xorg mailing list xorg@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/xorg
Re: XFixesFetchRegion() crashes app
Please don't think i know what you are actually trying to do, i solved this like you would a puzzle. First guess happened to work. Maarten. ___ xorg mailing list xorg@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/xorg
Re: XFixesFetchRegion() crashes app
And this region is some property of the root window? ___ xorg mailing list xorg@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/xorg
Re: XFixesFetchRegion() crashes app
Kai-Uwe Behrmann k...@gmx.de writes: My application attaches a XFixes created reactangle to a window. Therefore it does a XOpenDisplay() + XFixesCreateRegion() + XCloseDisplay() inside one short function and done. After the above outlined function resturns a call to XFixesFetchRegion() from a outside observer forces the application to quit: PropertyNotify : _NET_COLOR_REGIONSv 679x580+642+245 2 X Error of failed request: 179 Major opcode of failed request: 155 (XFIXES) Minor opcode of failed request: 19 (XFixesFetchRegion) Serial number of failed request: 7927 Current serial number in output stream: 7927 Any idea how to avoid a quit from XFixesFetchRegion()? A error message would be enough. A exit in not acceptable to the application. My memory is rather unclear on this point, but if the default error handler exits the program, the solution could be to install your own error handler with XSetErrorHandler() eirik ___ xorg mailing list xorg@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/xorg
Re: XFixesFetchRegion() crashes app
Am 23.06.09, 13:10 +0200 schrieb Eirik Byrkjeflot Anonsen: Kai-Uwe Behrmann k...@gmx.de writes: Any idea how to avoid a quit from XFixesFetchRegion()? A error message would be enough. A exit in not acceptable to the application. My memory is rather unclear on this point, but if the default error handler exits the program, the solution could be to install your own error handler with XSetErrorHandler() man XSetErrorHandler is the right pointer. Thanks. kind regards Kai-Uwe Behrmann -- developing for colour management www.behrmann.name + www.oyranos.org ___ xorg mailing list xorg@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/xorg
