CODEWITHSUNDEEP
c++.netinterop
Eshwar
Eshwar

Reputation: 37

.NET and C++ interoperability

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

Upvotes: 0

Views: 117

Answers (1)

Martin
Martin

Reputation: 181

You have different return types, it is declared to return void, but you import it with bool.

Upvotes: 1

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