AccessViolationException when PInvoking C++ DLL (cdecl calling convention problem?) [closed]

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I've spent all day researching this, and I'm none the wiser:

I have a C# DLL which PInvokes a method in a C++ DLL. I have had no problems doing this when compiling in Debug mode, but when compiling in Release mode I get an AccessViolationException. Googling this problem tells me that it's probably an issue with incompliant calling conventions. The code now looks like this in C#:

[return: M开发者_运维百科arshalAs(UnmanagedType.U1)]
[DllImport("Native.dll", CallingConvention = CallingConvention.Cdecl)]
internal static extern Boolean AMethod(Int32 mode, byte frame);

and in C++:

extern "C" {
     DLL_EXPORT bool AMethod(int mode, BYTE frame)
     {
      ...
     }
}

I've set the C++ project to compile with the __cdecl calling convention in VS2010, but I still get the AccessViolationException and I have no idea what more I can do. I should note that my C++ DLL uses third-party DLLs, and I do not know what calling convention they use.

Any help would be appreciated!

Oh, and I don't get the exception on my development machine, only on my target system.

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Try with this reordering of statements :

[DllImport("Native.dll", CallingConvention = CallingConvention.Cdecl)]
[return: MarshalAs(UnmanagedType.U1)]
internal static extern Boolean AMethod(Int32 mode, byte frame);