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I have had this problem with C# when I was using DotNet1.1 The problem is this. I have an unmanaged dll, which has a function which takes a function pointer (among other arguments). When I declare the DLLImport in C# code, I pass a delegate. But the delegates in C# have stdcall calling convention whereas the unmanaged function expects a cdecl function pointer. Thus my naive approach resulted in crashes. Then I found the following: http://www.codeproject.com/KB/cs/cdeclcallback.aspx Some guy wrote an excellent library that enables changing calling convention of the delegate by, as I understood, MSIL-hacking. Things went well, until... I migrated to VS2008 and the new version of .NET. Under this version the abovementioned library doesn't work. I am not really a C# or .NET expert, and, to tell the truth, I barely understand what his library does (although it's open-source), so I don't even want to try to adapt it to new .NET. However I am hoping that newer version of C# has some better solution available for my problem. So, SO experts, please help me with my pain in the buttocks :)

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