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X Window query
Hello! I am developing a software to monitor the X Window applications in Linux, using C and Xlib. I am able to find out which
applications (windows) are open and even get some of the events that occur in those applications. My problem is that when I close any window while the system is being monitored, a message like this appears at the terminal.
X Error of failed request: BadWindow (invalid Window parameter)
Major opcode of failed request: 20 (X_GetProperty)
Resource id in failed request: 0x20002bb
Serial number of failed request: 33677
Current serial number in output stream: 33677
Immediately, the monitoring stops and the command prompt appears. I use the XFetchName and XQueryTree functions for finding out the open windows. How can I suppress the above error message and *continue monitoring*?
More still, how can I find out if a window has been closed? It does not work if I use a flag to mark a closed window. (I set this flag in the event handler for DestroyNotify).
if (node->dflag == 2)
/* monitoring part */
where node is a structure variable storing details about this window.
The problem is compounded because the program is recursive to find out all the windows spawned by each window. I think the program terminates even before the check is performed the next time through the code.
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