Delegates in C++/CLI

[cowabunga]

Hi,

I have the following callback registration function in my Native dll

typedef        void    (*IpOptMsg)(LPARAM lParam, int ipoptMsg, LPARAM lParamStruct);

 void NLPRegisterCallback( IpOptMsg        fnMsg);

And in my managed C++ code I write,

public ref class LibWrap
{
public:
   delegate void EvaluateObjective(IntPtr lParam, int ipoptMsg, IntPtr lParamStruct);

    [DllImport("demo.dll", CallingConvention = CallingConvention::Cdecl)]
	static void IpOptNLPRegisterCallback(IntPtr lParam, EvaluateObjective^ fnMsg, IntPtr lParamStruct);
};
int main(array<System::String ^> ^args)
{
LibWrap::EvaluateObjective^ evalObjective;
LibWrap::IpOptNLPRegisterCallback(handle,evalObjective, IntPtr::Zero);
}

I don't get any compilation error, my after running my code I get an exception saying the memory is corrupt.

In C# I do the same thing as - and it works fine!

[UnmanagedFunctionPointerAttribute(CallingConvention.Cdecl)]
public delegate void EvaluateObjective(IntPtr lParam, uint ipoptMsg, IntPtr lParamStruct);

[DllImport("demo.dll", CallingConvention = CallingConvention.Cdecl)]
unsafe public static extern void IpOptNLPRegisterCallback(IntPtr lParam, EvaluateObjective fnMsg, IntPtr lParamStruct);

Thanks in advance!