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POC++/C# Float issues
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  1. POC++/C# Float issues
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    copied!<p>I have a problem when trying to read a struct from C++ in C#. I did this more times and it worked always, but i never used floating point numbers.</p> <p>These are the structs i use on the C# side:</p> <pre><code>[StructLayout(LayoutKind.Sequential)] public struct ImageData { public UInt32 Width; public UInt32 Height; public UInt32 Length; public IntPtr PixelPointer; } [StructLayout(LayoutKind.Sequential)] public struct UserData { public UInt32 misc; public Boolean IsValid; public VirtualPosition RightHand; public VirtualPosition LeftHand; public VirtualPosition Head; } [StructLayout(LayoutKind.Sequential)] public struct VirtualPosition { public Position3D RealPosition; public Position3D ProjectedPosition; } [StructLayout(LayoutKind.Sequential)] public struct Position3D { public float X; public float Y; public float Z; } </code></pre> <p>This are the structs i use on the C++ side:</p> <pre><code> typedef struct XnVector3D { XnFloat X; XnFloat Y; XnFloat Z; } XnVector3D; class VirtualPosition { public: XnVector3D RealPosition; XnVector3D ProjectedPosition; VirtualPosition(void) { } VirtualPosition(XnVector3D real, XnVector3D projected) { RealPosition = real; ProjectedPosition = projected; } }; class UserData { public: int misc; // Misc number to check if i have the correct pointer ( debug only ) bool Valid; VirtualPosition RightHand; VirtualPosition LeftHand; VirtualPosition Head; }; </code></pre> <p>Now the C# part which has been used to get the data:</p> <pre><code>public unsafe UserData GetUserData(UInt32 user) { IntPtr pos = GetData(_Index, user); UserData* ptr = ((UserData*)pos.ToPointer()); UserData result = *ptr; return result; } [DllImport("KinectNative.dll", CallingConvention = CallingConvention.Cdecl)] private static extern IntPtr GetData(Int32 index, UInt32 user); </code></pre> <p>And finally the part which is used to retrieve data( C++ ):</p> <pre><code>EXPORT UserData* GetData(int index, XnUserID user) { if (_LastData != NULL) _LastData-&gt;~UserData(); system("cls"); _LastData = new UserData(_Context-&gt;GetDevice(index)-&gt;GetData(user)); std::cout &lt;&lt; "X: " &lt;&lt; (int)_LastData-&gt;Head.ProjectedPosition.X &lt;&lt; " Y:" &lt;&lt; (int)_LastData-&gt;Head.ProjectedPosition.Y &lt;&lt; std::endl; return _LastData; } </code></pre> <p>The misc number is correct when reading it in C# and the Console tells me the correct numbers, but all floats are corrupted and when i get different numbers in C++ and C#. Anyway the difference is to large to accept it. ( Got 340 in C++ and around 0.xxxxxxx in C# ).</p> <p>Any help would be welcome. Thanks.</p>
 

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