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I'm running into a runtime check failure when I attempt to use functions that have been mapped to the functions in the SD2.dll.  It seems like this only happens when using a function that contains 1 or more parameters, so SD_Create is returning a valid handle, but as soon as I attempt to call SD_Destroy or SD_Set, this error appears.  The specific error is:

Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call.  This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.

 

How have you declared the function pointers that are being returned by GetProcAddress?  The functions are exported from the SD2.dll using the __stdcall calling convention.  If the function parameters are declared using a different calling convention, there is a good chance that you will receive this error.

Thanks that was exactly what I was missing, I just changed my function pointer from:

 int (*OPWrapper::SD_Destroy)(int Handle) = NULL;

to

int (__stdcall *OPWrapper::SD_Destroy)(int Handle) = NULL;

and now all the function calls appear to be working perfectly.