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WinNT and Generic Thunks

Posted on 1997-12-02
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Last Modified: 2013-12-03
I am using Generic Thunks in order to have a 16 bit App use a 32 bit DLL. First, from the 16 bit App I call GetVersion() to verify it is running in a 32 bit OS (Jeff Richter in his book 'Advanced WIndows' claims both Win95 & WinNT are hard coded to return 3.95, pgs 30, 31). Second, I use LoadLibraryEx32W() to load the 32 bit DLL, etc.
This has all been coded and debuged in Win95 and all works as expected. I have recently ported it to WinNT (ver 4.0) and this is where everything breaks down. First of all, the 16 bit GetVersion() call returns 3.1, then the LoadLibraryEx32W() fails (returns NULL).
What is going on here? It appears WinNT is simulating a 16 bit 'Win3.1' enviornment for the 16 bit App. According to all the documentation I have read this should have behaved exactly as in Win95. Also, I cannot find a way to determine why LoadLibraryEx32W() failed because I have not found a 16 bit API equivalent to the Win32 GetLastError() function.

Thanks for any help.
Jeff Reich
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Question by:reichj
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alexo earned 300 total points
ID: 1409045
Check articles Q125710 and Q104009 from the MS knowledge base.

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by:reichj
ID: 1409046
Been there, done that.

Actually, forget the Generic Thunks, Do you know why the 16 bit App's GetVersion() function is not returning 3.95 when running under WinNT (it returns 3.1)?

Thanks.

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by:alexo
ID: 1409047
No.  But you can check the "OS" environment variable.
On NT should be: OS=Windows_NT

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