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copied!<p>If I had to wager a guess, you're trying to taken the address of a MANAGED function and pass it as a NATIVE function pointer. That won't work at all. Either write a native bridge (harder and probably no advantage), or (and this is the easier approach), create a delegate and use <a href="http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.getfunctionpointerfordelegate.aspx" rel="noreferrer">Marshal.GetFunctionPointerForDelegate</a>. Don't forget that the delegate has to stay alive for the duration that the native code expects to call back, so you most likely need to store it somewhere.</p> <p>Oh, and all functions inside a ref class or value class are managed functions, in case that wasn't clear.</p> <p>[EDIT] Expanding answer to cover questions in comments. The first step is to create a matching delegate. For the function you provided, it's going to look like this:</p> <pre><code>public delegate void CallbackFuncDelegate(DWORD ddStatus, LPVOID lpParam); </code></pre> <p>Then, you'll need to create one:</p> <pre><code>CallbackFuncDelegate del = gcnew CallbackFuncDelegate(CallbackFunc); </code></pre> <p>And as noted previously, you should store that IN your class as a member in order to make sure it doesn't vanish. Lastly, you need to get the function pointer and pass it down:</p> <pre><code>MyCo_Device_Register_CallbackFunc((MyCo_Device_CallbackProc) Marshal::GetFunctionPointerForDelegate(del).ToPointer(), 0, 0); </code></pre> <p>I think that covers everything. All you need is using namespace System; and you should be fine.</p>

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