Calling methods of a class in a Win32 Dll

Question

I know that you can call functions of a Win32 library from C#. So if you have the following function: void Foo(unsigned short msg unsigned int param); You can write in C# the following P/Invoke code: [DllImport(whatever.dll CharSet=CharSet.Auto SetLastError=true)] public static extern uint Foo(ushort messge uint param); The problem is how can I call methods of an exported class inside a Win32 Library for example: class Foo { public: void Method1() { /* ... */ } }; Thanks in advance.

shimtanny · Answer

Hi With p/invoke this is the only way. Maybe it is possible to create a wrapper with MCC. Instantiate unmanaged classes in managed code is possible with COM interop. Cheers Simon

ZanettiEsteban · Answer

Thanks simon. The problem is that Method1 is not an static method of the class Foo. I requiere to create an object of Foo in C# and then call Method1. The solution that you describe would be ok if Method1 were static. Thanks anyway.

shimtanny · Answer

Hi It is possible to call unmanaged code from managed. But only with some bridging technologies. For example P/Invoke (as you already have mentioned) or creating some wrappers with managed c++. There is also a mechanism of interoperability between .net com (unmanaged code also). **************** In your case you have to export Method1 of the whatever.dll. Then you can use it with P/Invoke the following way (this is just one possiible way): public class Win32Wrapper { [DllImport(whatever.dll CharSet=CharSet.Auto SetLastError=true)] public static extern uint Method1(ushort messge uint param); } public class MainClass { public static void Main(string[] args) { uint result = Win32Wrapper.Method1(2 5); } } I hope i helped a little bit. Cheers Simon

ZanettiEsteban · Answer

Somebody tell me that is impossible to make a call to a not managed methods of a class coded in C++. Away of how to make it Does anybody know if at least is possible?