C++ data types into C# datatypes

Question

I know these aren't correct but I'm stumped as to how I should go about importing 2 functions I compiled into a dll from a post from www.ring3circus.com ; into a C# application. I've never tried importing functions from a non-C# dll before so I've been googleing all day but to no avail. In C# app: [ DllImport ( R_3D_BYOND.dll  CharSet = CharSet .None)] public static extern int Initialise( int h); [ DllImport ( R_3D_BYOND.dll  CharSet = CharSet .None)] public static extern int Release( /*What parameter do I use? Null?*/ ); //what's the equivalent of a DWORD in c#? is this where I MarshalAs something? In C++ dll: DWORD WINAPI Initialise(__in LPVOID lpParameter) DWORD WINAPI Release( void * parameter) The overall project I'm working on is a little wild because it incorporates 3 overall languages but the resulting effect would be neat so I'd appreciate any help I can get.

Alan · Answer

DWORD is a 4 byte unsigned integer in C++ and so the C# equivalent is uint. void* means a pointer to an unknown type (in effect a generic pointer) and so it's usually translated as IntPtr in C#. The same applies to LPVOID. __in just means that it's an input only parameter. WINAPI is the default calling convention for .NET so no need for any adjustment there. So I'd use the following C# signatures: [DllImport(R_3D_BYOND.dll)] public static extern int Initialise(IntPtr parameter); [DllImport(R_3D_BYOND.dll)] public static extern int Release(IntPtr parameter);