.NET和C ++互操作性

Question

I'm having a C++ dll which has an exported function having the following signature...

__declspec(dllexport) __stdcall
 void Paint(LPDISPATCH& disp, VARIANT& x, VARIANT& y, VARIANT& z);

I want to call the this exported function from C#.NET. For this is used the following prototype...

[DllImport("xyz.dll", 
CallingConvention = CallingConvention.StdCall)
public static extern void Paint(
            [MarshalAs(UnmanagedType.IDispatch), In, Out] ref object which,
            [MarshalAs(UnmanagedType.I4), In, Out] ref object x,
            [MarshalAs(UnmanagedType.I4), In, Out] ref object y,
            [MarshalAs(UnmanagedType.I4), In, Out] ref object x);

When i tried to invoke the call, it is throwing an exception saying that Attempted to read/write memory which is invalid.

Please advise me on this, on how to P/invoke this C++ API from .NET.

Much Thanks, Sundareswaran Senthilvel

Answer 1

您有不同的返回类型，它声明为返回void ，但是您使用bool导入了它。