[fpc-devel] Windows 64bit SEH exception handling

Sergei Gorelkin sergei_gorelkin at mail.ru
Wed Jun 20 06:19:18 CEST 2012

19.06.2012 23:43, tomek пишет:
> Hello,
> with reference to http://bugs.freepascal.org/view.php?id=12742 about random crash with Windows
> OpenDialog Box only on Win7 64bit.
> Today I compile trunk-fpc with TEST_WIN64_SEH support and it seems that this bug is resolved with SEH.
> I checked a few times to make sure that this is due to SEH support.
> My question is, why? how is it possible that support for SEH exceptions handling fix OpenDialog issue ?
> or perhaps an exception is hidden ? as described in http://support.microsoft.com/kb/976038
> do have you any suggestions ?
Non-SEH exception handling on Win64 is known to handle exceptions too early, bypassing frame-based 
handlers and therefore disrupting the intended control flow. Most probably the exception under 
question was meant to be handled within OS libraries and not passed to the application.


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