CODEWITHSUNDEEP
c++dllloadlibrary
user236520
user236520

Reputation:

LoadLibrary failing on Win7 32 bit, succeeding on Win XP 32 bit

I am trying to load a 3rd party dll (i.e. I have no source code) into my application. On a windows xp 32 bit system, it loads fine, but on a windows 7 system it fails to load, citing error #998 from GetLastError()

I used a dll export viewer to view the imported and exported symbols of the dll, and observed that all but 3 dlls listed in the import table came from this 3rd party vendor. The ones that didn't are:
kernel32.dll
mingwm10.dll
msvcrt.dll

Here is the code I am using to do the import:

SetDllDirectory(L"c:\\dlls");
HMODULE tempDLL = LoadLibrary(L"mydll.dll");
DWORD err = GetLastError();

Any tips on how to go about debugging this, please?

Edit: My thanks to everyone for the answers, and this is what I have discovered so far:
a) The application toolkit package did not prove to be that useful (see below)
b) Colleague A can get the dll to load on his win 7 machine and colleague B cannot, so it something sporadic
c) Running as admin did not change anything

Upvotes: 0

Views: 2870

Answers (2)

Roddy
Roddy

Reputation: 68053

Have you tried with Data Execution Prevention (DEP) disabled?

This is normally enabled by default on Vista and above, but disabled on XP. If your DLL has a bug causing it to execute data, this could show up during the LoadLibrary call.

Upvotes: 1

Kirill V. Lyadvinsky
Kirill V. Lyadvinsky

Reputation: 99605

Try to use Microsoft Application Compatibility Toolkit (it is a free toolset) to find out why it fails on Windows 7. Hope this will help, it looks like a compatibility issue.

Upvotes: 5

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