Using a C++ DLL with C#

[Dave C]

I have a 3rd party dll written in VC6.0 that I want to use within a C# application. When I call one of the exported functions I get a can't find entry point exception.

The dll is called diodrv.dll and there are 4 exported functions. Dumpbin and Depends both report this:

File Type: DLL

Section contains the following exports for diodrv.dll

ordinal hint RVA name

1 0 00001110 ?CloseDio@@YGXXZ
2 1 00001040 ?CreateDio@@YGKXZ
3 2 00001080 ?ReadDioReg@@YGKK@Z
4 3 000010D0 ?WriteDioReg@@YGXKK@Z

I have the source code and VC6 project for the dll. The function definitions are like this:

#define DIODRV_API __declspec(dllexport)

DIODRV_API DWORD __stdcall CreateDio(void);

My C# for importing the functions is this:

[DllImport("diodrv.dll")]
static extern Int32 CreateDio();

What's the best way to get access to these functions?

Thanks

[S_M_A]

This isn't really my area but you might try setting ExactSpelling to false. See http://msdn.microsoft.com/en-us/library/7b93s42f.aspx

[Arjay]

The name mangling is messing you up.

[Dave C]

The name mangling is messing you up.

OK.. Is there some way to rebuild the dll such that the names aren't mangled?

[Arjay]

OK.. Is there some way to rebuild the dll such that the names aren't mangled?

I would use a .def file.

http://msdn.microsoft.com/en-US/libr...(v=vs.80).aspx

[Dave C]

Thank you Arjay - the DEF file worked.