.NET and C++ interoperability

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

Part of the problem may be in how you are calling the method, can you show some code that attempts to call the method from .Net. — morechilli
– morechilli, Commented Mar 26, 2012 at 11:14

Martin · Accepted Answer · 2012-03-26 09:10:56Z

1

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

answered Mar 26, 2012 at 9:10

Martin

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Eshwar Over a year ago

Yeah now it is corrected, please provide me an answer for my problem.

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