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copied!<p>A couple of things jump out at me. First of all I don't see why you need to use unsafe. Secondly, you probably have a calling convention mismatch, cdecl in the C++ and stdcall in the C#.</p> <p>I'd do it like this:</p> <p><strong>C++</strong></p> <pre><code>struct RESOURCE_PARAMETERS{ unsigned int uSurfaceHeight; unsigned int uSurfaceDepth; unsigned int uSurfaceWidth; unsigned int uMSAAHeight; unsigned int uMSAAWidth; unsigned int uArraySize; unsigned int uNumSamples; unsigned int uMaxLod; unsigned int uBpp; unsigned int uprefFlag; unsigned int uusageFlag; RESOURCE_TYPE_REC ResourceType; int ResourceFormat; int iBuildNumber; }; int function(RefPar &parameters) { } </code></pre> <p><strong>C#</strong></p> <pre><code>[StructLayout(LayoutKind.Sequential)] public struct RESOURCE_PARAMETERS { uint uSurfaceHeight; uint uSurfaceDepth; uint uSurfaceWidth; uint uMSAAHeight; uint uMSAAWidth; uint uArraySize; uint uNumSamples; uint uMaxLod; uint uBpp; uint uprefFlag; uint uusageFlag; [MarshalAs(UnmanagedType.U4)] ResourceType ResourceType; int ResourceFormat; int iBuildNumber; } [DllImport("VistaGMMDLL.dll", CallingConvention = CallingConvention.Cdecl)] static extern int function(ref RESOURCE_PARAMETERS parameters); RESOURCE_PARAMETERS parameters = new RESOURCE_PARAMETERS(); int result = function(ref parameters); </code></pre> <p>I'm not sure how big the enum is on the C++ size. That's why I've put an explicit MarshalAs in the C# code. If it's just a single byte, then use UnmanagedType.U1 instead. I trust you get the idea.</p> <p>If your C++ function treats its parameter as an in/out parameter then using ref on the C# side is correct. If its actually an out parameter then change the code to be like this:</p> <pre><code>[DllImport("VistaGMMDLL.dll", CallingConvention = CallingConvention.Cdecl)] static extern int function(out RESOURCE_PARAMETERS parameters); RESOURCE_PARAMETERS parameters; int result = function(out parameters); </code></pre>

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