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C# implemenation of IDL declaration with an INT_PTR
[id(7), helpstring("method SomeFunction")] HRESULT SomeFunction([in] INT_PTR windowHandle, [out, retval] VARIANT_BOOL* dlgResult);

public bool SomeFunction(int windowHandle)

#if WIN64
     long handle;
     public bool SomeFunction(long windowHandle)
#else
     int handle;
     public bool SomeFunction(int windowHandle)
#endif

public bool SomeFunction(IntPtr windowHandle)
{
    // Implementation here.
    // If you need the value of the pointer in the implementation,
    // you can use:
    // long actualValue = windowHandle.ToInt64();
}

long actualHandle = 1234;
IntPtr handlePtr = new IntPtr(actualHandle);
bool returnValue = SomeFunction(windowHandle);