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How can I debug, step through a C++ DLL that I pinvkie?

Posted on 2006-11-07
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Last Modified: 2010-04-16
Hi, I'm getting that now source code is avialbe when I want to step into my C++ DLL that I pinvok in my C# application.  How can I so this?  I'm using vs2005, .net 2.0  Thanks.
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Question by:lapucca
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AlexFM earned 2000 total points
ID: 17896000
Open C++ Dll project, set C# client as executable for debugging: Project - Properties - Configuration Properties - Debugging - Command. Type here C# executable name. Set breakpoint in unmanaged function and select "Start Debugging".
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by:lapucca
ID: 17900532
I followed your insstructions and the calling appl starts but I didn't stop at my breakpoin in the unmagaed code and I'm just getting the error message as if I'm just running the C# application directly.  What else can I check?  Thank you.
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LVL 48

Expert Comment

by:AlexFM
ID: 17900615
What error message? Are you sure that unmanaged function is called? If there is some interoperability problem, aplication can crash before unmanaged function is called.
To test this, add OutputDebugString call to the beginning of unmanaged function, and run with DebugView program:
http://www.microsoft.com/technet/sysinternals/utilities/DebugView.mspx
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Author Comment

by:lapucca
ID: 17900649
It calls the  the unMaged function for sure.  I stepped through the c# application and got the same error message when the unmanaged function is called.  It doesn't crash the application.  The error message just says Login fail: unknown userid and password.  This is what I'm trying to locate in the unmanaged function as where is this happening.   The error message is put out from the unmanaged function definitely.  Thanks.
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Author Comment

by:lapucca
ID: 17902055
I have no idea what I did but I am now able to step through the Unmanaged code from my C# application.  I swear that I wasn't able to do this last night and this morning.  Thanks.
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