Windows not appearing in XP.

[beardybloke]

How complex are these windows? AFAIR there's some limit of HWNDs you can have, but you shouldn't run out of them with just three windows.

These windows are fairly complex and allocate a load of memory.

I havent had a chance to look at generating a code snippet to demonstrate this any further as I've been assigned to look at something else in the meantime.

An extra piece of information that I did discover yesterday - I'm beginning to think its simply a resource issue on the PC rather than a Qt issue per se, while i was recreating this I had a small compile for something else going in the background, the compile failed with a win32 error 1114 whilst trying to load user32.dll. With that in mind I tried to load the taskmanager & a performance meter and they failed to load (reported by Event Viewer). Another less complex window within the app, which doesnt have the problem on its own will also redraw on the screen background rather than within the dialog once I get to this state. I'll dig around when I get back to this problem probably tomorrow.

Thanks again for all your help so far.

[jacek]

I'm beginning to think its simply a resource issue on the PC rather than a Qt issue per se, while i was recreating this I had a small compile for something else going in the background, the compile failed with a win32 error 1114 whilst trying to load user32.dll.

You can use Process Explorer to see how much resources your application uses (esp. it can display the number of open handles).

[beardybloke]

You can use Process Explorer to see how much resources your application uses (esp. it can display the number of open handles).

Thanks for that - this showed that the window was consuming about 3K User Handles. Everything goes screwy after 10K which appears to be the limit.

Thanks for the pointers....