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copied!<p>You probably need to use the <a href="http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.getdelegateforfunctionpointer.aspx" rel="nofollow"><code>Marshal.GetDelegateForFunctionPointer</code> function</a></p> <p>This takes an <code>IntPtr</code> pointing to a native method and gives you back a delegate you can call.</p> <pre><code>public struct test { IntPtr API_GetUID; IntPtr API_GetChipType; } [DllImport(@"GDevice.dll")] public static extern void GetAPIObject(ref test test_a); delegate void GetUID_Delegate(IntPtr pData, uint dataLen); delegate uint GetChipType_Delegate(); test a = new test(); GetAPIObject(ref a); GetUID_Delegate getUID = Marshal.GetDelegateForFunctionPointer<GetUID_Delegate>(a.API_GetUID); GetChipType_Delegate getChipType = Marshal.GetDelegateForFunctionPointer<GetChipType_Delegate>(a.API_GetChipType); uint chipType = getChipType(); </code></pre> <h1>Edit</h1> <p>Alternatively use <a href="http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.unmanagedfunctionpointerattribute.aspx" rel="nofollow">UnmanagedFunctionPointerAttribute</a>. </p> <pre><code>public struct test { GetUID_Delegate API_GetUID; GetChipType_Delegate API_GetChipType; [UnmanagedFunctionPointer(CallingConvention.Cdecl)] delegate void GetUID_Delegate(IntPtr pData, uint dataLen); [UnmanagedFunctionPointer(CallingConvention.Cdecl)] delegate uint GetChipType_Delegate(); } [DllImport(@"GDevice.dll")] public static extern void GetAPIObject(ref test test_a); test a = new test(); GetAPIObject(ref a); uint chipType = a.API_GetChipType(); </code></pre>

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