yosemite x64 qt lazarus r48632
I get this error, when I click to close border icon of "breakpoitns" form. I get same error, when my application's form close from border icon.

"QtObjectFromWidgetH: QObject_property returned a variant which is not TQtWidget."
press OK to....................

I get this error, when click to Ok button.

Press "Ignore" to continue debugging. This may NOT be safe. Press "Abort" to stop the debugger.

Exception: Exception with message "QtObjectFromWidgetH: QObject_property returned a variant which is not TQtWidget."

Context: TGDBMIDebugger. State: dsRun

$00000001001BE074

$00000001001BE140

$00000001001BFEFD

$0000000106B41C2E

$0000000105BE19AD

$0000000105BE9720

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Good to know somebody else can also reproduce this. Zeljko cannot reproduce. We both have 64-bit systems while Zeljko has a 32-bit system. Maybe that makes the difference.

Juha
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I cannot reproduce it on 64bit Fedora 19 too, but I'm still using fpc-2.6.4.Freeman is using 3.xx and probably you, so that can make difference. Anyway, I didn't try to close debugger windows, just using lazarus and my apps.

zeljko

What is "border" icon ? Close button in title bar ?

zeljko

Cannot reproduce with fixes_3_0 + lazarus trunk too, qt-4.8.6, Fedora 19 64bit, KDE.
For you and freeman: pls. before raising exception add IsValidHandle(HWND(Obj)) and check result. That could be destroyed handle inside event.

zeljko

Now I can reproduce each time. Non modal, non Application.MainForm Form which does not have OnCloseQuery assigned will raise such exception if it's closed via close button in title bar.
Exception is raised from FocusChanged in qtobject.inc, since OldWidget is probably destroyed. IMO, we should not raise exception there, just check IsValidHandle(), and if it isn't return Nil.

zeljko

Fixed. That exception comes from nil object.

zeljko

zeljko wrote

What is "border" icon ? Close button in title bar ? zeljko

Yes. Close button in title bar ?
while answering, came fixed message

Fixed. That exception comes from nil object. zeljko

I'm sorry, I been late and couldn't answer,( headache) I'll test in a few seconds, and let you know
Thank you.
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lazarus r48634 fpc r30419 yosemite x64 qt
fixed.
Thank you

zeljko wrote

Fixed. That exception comes from nil object. zeljko

FreeMan wrote

lazarus r48634 fpc r30419 yosemite x64 qt fixed. Thank you

Thanks. I'll leave exception there "just in case", but doubt that it'll trigger.

zeljko