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copied!<p>I tried your struct in two projects (C++/C#) and it seems to work correctly.</p> <p>I use this in C++:</p> <pre><code>#include "stdafx.h" #include "windows.h" #pragma pack(1) // pack the following structures on one-byte boundaries // Bird position structure typedef struct tagBIRDPOSITION { short nX; // x-coordinate short nY; // y-coordinate short nZ; // z-coordinate } BIRDPOSITION; // Bird angles structure typedef struct tagBIRDANGLES { short nAzimuth; // azimuth angle short nElevation; // elevation angle short nRoll; // roll angle } BIRDANGLES; // Bird matrix structure typedef struct tagBIRDMATRIX { short n[3][3]; // array of matrix elements } BIRDMATRIX; // Bird quaternion structure typedef struct tagBIRDQUATERNION { short nQ0; // q0 short nQ1; // q1 short nQ2; // q2 short nQ3; // q3 } BIRDQUATERNION; #pragma pack() // resume normal packing of structures typedef struct tagBIRDREADING { BIRDPOSITION position; // position of receiver BIRDANGLES angles; // orientation of receiver, as angles BIRDMATRIX matrix; // orientation of receiver, as matrix BIRDQUATERNION quaternion; // orientation of receiver, as quaternion WORD wButtons; // button states } BIRDREADING; #define BIRD_MAX_DEVICE_NUM 126 // Bird frame structure // // NOTE: In stand-alone mode, the bird reading is stored in reading[0], and // all other array elements are unused. In master/slave mode, the "reading" // array is indexed by bird number - for example, bird #1 is at reading[1], // bird #2 is at reading[2], etc., and reading[0] is unused. typedef struct tagBIRDFRAME { DWORD dwTime; // time at which readings were taken, in msecs BIRDREADING reading[BIRD_MAX_DEVICE_NUM + 1]; // reading from each bird } BIRDFRAME; extern "C" __declspec( dllexport ) BOOL birdGetMostRecentFrame(int nGroupID, BIRDFRAME *pframe) { pframe->dwTime = GetTickCount(); for (int i = 0; i < sizeof(pframe->reading)/sizeof(*pframe->reading); i++) { pframe->reading[i] = BIRDREADING(); pframe->reading[i].position.nX = (short)i; pframe->reading[i].position.nY = (short)i + 1; pframe->reading[i].position.nZ = (short)i + 2; } return TRUE; } </code></pre> <p>And this in C#:</p> <pre><code> [StructLayout(LayoutKind.Sequential, Pack = 1)] public struct BIRDPOSITION { public short nX; public short nY; public short nZ; } [StructLayout(LayoutKind.Sequential, Pack = 1)] public struct BIRDANGLES { public short nAzimuth; // azimuth angle public short nElevation; // elevation angle public short nRoll; // roll angle } [StructLayout(LayoutKind.Sequential, Pack = 1)] public unsafe struct BIRDMATRIX { public fixed short n[9]; } [StructLayout(LayoutKind.Sequential, Pack = 1)] public struct BIRDQUATERNION { public short nQ0; // q0 public short nQ1; // q1 public short nQ2; // q2 public short nQ3; // q3 } [StructLayout(LayoutKind.Sequential, Pack = 0)] public struct BIRDREADING { public BIRDPOSITION position; public BIRDANGLES angles; public BIRDMATRIX matrix; public BIRDQUATERNION quaternion; public ushort wButtons; } [StructLayout(LayoutKind.Sequential, Pack = 0)] public struct BIRDFRAME { public uint dwTime; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 127)] public BIRDREADING[] readings; } public partial class Form1 : Form { [DllImport(@"Bird.dll", CallingConvention = CallingConvention.Cdecl)] public static extern bool birdGetMostRecentFrame(int nGroupID, ref BIRDFRAME frame); public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { BIRDFRAME bf = new BIRDFRAME(); if (checkBox1.Checked) { bf.readings = new BIRDREADING[127]; } if (birdGetMostRecentFrame(0, ref bf)) { listBox1.Items.Add(bf.dwTime.ToString()); Console.WriteLine(bf.dwTime.ToString()); for (int k = 1; k <= 3; k++) { var reading = bf.readings[k]; Console.WriteLine(String.Format(" [{0}][{1}][{2}]", reading.position.nX.ToString(), reading.position.nY.ToString(), reading.position.nZ.ToString())); listBox1.Items.Add(String.Format(" [{0}][{1}][{2}]", reading.position.nX.ToString(), reading.position.nY.ToString(), reading.position.nZ.ToString())); } } } } </code></pre> <p>In both cases (reading initialized as new in C#, or not it gives back meaningful data:</p> <pre><code>40067905 [1][2][3] [2][3][4] [3][4][5] 40068653 [1][2][3] [2][3][4] [3][4][5] 40069418 [1][2][3] [2][3][4] [3][4][5] 40072585 [1][2][3] [2][3][4] [3][4][5] </code></pre> <p>Did it on Windows7 64 bit. I'm attaching a ZIP with both projects for VS2010.</p> <p>Here is the link:</p> <p><a href="http://hotfile.com/dl/115296617/9644496/testCS.zip.html" rel="nofollow">http://hotfile.com/dl/115296617/9644496/testCS.zip.html</a></p> <p>It seems that you are setting wrong values inside that position struct :/</p>

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