We help IT Professionals succeed at work.

WinNT and Generic Thunks

reichj
reichj asked
on
Medium Priority
346 Views
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
Comment
Watch Question

Commented:
Check articles Q125710 and Q104009 from the MS knowledge base.

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts

Author

Commented:
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.

Commented:
No.  But you can check the "OS" environment variable.
On NT should be: OS=Windows_NT

Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.