Compare VC++ to C# w.r.t loading a DLL

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Dear All,

Yesterday, I tried to load the third party dll of my device to C# using PIO calls .. like DLLIMPORT command. Whenever I run the application, build failed because of Loading the dll failed. I thought that, that given dll was corrupted.

In the next, I thought that wants to load from VC++ using __stdCall command. There I got a message as zlib1.dll is not able to refer ..

I am not getting a similar kind of error message in C# / VS 2008 IDE ? Please suggest me the related settings to my IDE.

Thanks & Regards,
Kota V Subrahmanyam,
CMC Ltd, Hyderabad.

Posted 27-Jan-11 22:54pm

SKOTAJI

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Ryan Zahra 28-Jan-11 5:08am

Could you post the error message that you got both from the C++ and C# environments?

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Richard MacCutchan · Answer 1 · 2011-01-27T23:24:00

Solution 1

You need to check the documentation for the dll to make sure your DLLImport attributes are correct. This has nothing to do with VS 2008 IDE as the dll is only referenced when you actually run your program. Make sure the DLL is also accessible either in the same directory as the exe file or in one of the directories accessible via the PATH environment variable.

Posted 27-Jan-11 23:24pm

Richard MacCutchan

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SKOTAJI 28-Jan-11 7:34am

Thanks Richard for your immediate reply. As you said, documentation should specify those dependencies. Finally I am able to run the application by placing those two DLLs from BIN directory. But here my doubt is why this VS 2008 is not able to tell the dependency dll error ? Why from VC++ - VS 6.0 ?

Richard MacCutchan 28-Jan-11 8:40am

As I said before, Visual Studio does not check DLL dependencies for C# since the library is only referenced at run time. The actual mechanism is similar to the Win32 LoadLibrary() method, where the library is not linked to the project when it is built.

SKOTAJI 3-Feb-11 6:13am

I am clear now. Thanx Richard.