我一直在使用从传感器读取测量数据并使用用 C++ 编写的库来分析该数据的接口。
该功能大致如下：
- 在 C++ 库上设置测量参数
- 从传感器获取数据（总共 1200 次测量）
- 将数据写入 C++ 库
- 在 C++ 库中处理所有 1200 个测量值
- 从 C++ 库中读取结果
Calling this C++ library from C#-code 之前处理过这个问题：Calling unmanaged C++ library (dll) from C# create an access violation error (0xc0000005)。
现在看来，C++ 库要么
- 无法正确获取数据
- 无法保存数据
- 无法将结果正确返回到我的 C# 代码。
不好的是，我无法调试这个 C++ 库。
我的代码有什么问题？
1) 设置测量参数
namespace PdWaveApi
{
[StructLayout(LayoutKind.Sequential)]
public struct PDDataInfo
{
public int nPings;
public int nDataRate;
public int nSamples;
public float fFrequency;
public float fBeamAngle;
public int nInstrument;
public int nCoordSystem;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 9)]
public short[] hBeamToXYZ;
public short hWaveT1;
// Constructor
public static PDDataInfo Create()
{
PDDataInfo DataStruct = new PDDataInfo();
DataStruct.hBeamToXYZ = new short[9];
return DataStruct;
}
}
}
public class PdWaveBaseLWrapper
{
[DllImport("PdWaveBase.dll", EntryPoint = "PDSetInstrumentConfig")]
public static extern int PDSetInstrumentConfig(ref PDDataInfo pDataInfo);
}
public void SetInstrumentConfiguration()
{
PdWaveApi.PDDataInfo InstrumentConfiguration = new PdWaveApi.PDDataInfo();
.................
Initializing the InstrumentConfiguration structure
...............
PdWaveBaseLWrapper.PDSetInstrumentConfig(ref InstrumentConfiguration);
}
3) 从传感器读取数据并将数据写入 C++ 库
namespace PdWaveApi
{
[StructLayout(LayoutKind.Sequential)]
public struct PDWaveSample
{
[MarshalAs(UnmanagedType.I1)]
public bool Valid;
public float fPressure;
public float fDistance;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = Constants.PD_MAX_WAVEBEAMS)]
public float[] fVel;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = Constants.PD_MAX_WAVEBEAMS)]
public ushort[] nAmp;
// Constructor
public static PDWaveSample Create()
{
PDWaveSample DataStruct = new PDWaveSample();
DataStruct.fVel = new float[Constants.PD_MAX_WAVEBEAMS];
DataStruct.nAmp = new ushort[Constants.PD_MAX_WAVEBEAMS];
return DataStruct;
}
}
}
public class PdWaveBaseLWrapper
{
[DllImport("PdWaveBase.dll", EntryPoint = "PDSetWaveSample")]
public static extern int PDSetWaveSample(ref PDWaveSample pWaveSample);
}
namespace SensorInterface
{
public partial class frmSensorInterface : Form
{
public PdWaveApi.PDWaveSample WaveSampleData = PdWaveApi.PDWaveSample.Create();
private void OnNewData(object sender, OnNewDataEvent e)
{
ReadWaveSample(ref WaveSampleData);
SetWaveSample(ref WaveSampleData);
}
public void ReadWaveSample(ref PdWaveApi.PDWaveSample WaveSampleData)
{
DateTime MeasurementTimeStamp;
float[] dVel = new float[4];
float dTemperature = new float();
float dPitch = new float();
float dRoll = new float();
float dHeading = new float();
float dPressure = new float();
short[] sAmp = new short[4];
// Read some of the latest data from the control
GetVelocity(ref dVel[0], ref dVel[1], ref dVel[2], ref dVel[3]);
GetAmplitude(ref sAmp[0], ref sAmp[1], ref sAmp[2], ref sAmp[2]);
..............
// Set other data to the structure
}
public void SetWaveSample(ref PdWaveApi.PDWaveSample WaveSampleData)
{
PdWaveBaseLWrapper.PDSetWaveSample(ref WaveSampleData);
}
}
}
4) 在 C++ 库中处理所有 1200 个测量值
[StructLayout(LayoutKind.Sequential)]
public struct PDWaveBurst
{
[MarshalAs(UnmanagedType.ByValArray , SizeConst = Constants.PD_MAX_WAVEMEAS_AST)]
public float[] fST;
public float fWinFloor;
public float fWinCeil;
[MarshalAs(UnmanagedType.I1)]
public bool bUseWindow;
[MarshalAs(UnmanagedType.I1)]
public bool bSTOk;
[MarshalAs(UnmanagedType.I1)]
public bool bGetRawAST;
[MarshalAs(UnmanagedType.I1)]
public bool bValidBurst;
public static PDWaveBurst Create()
{
PDWaveBurst DataStruct = new PDWaveBurst();
DataStruct.fST = new float[Constants.PD_MAX_WAVEMEAS_AST];
return DataStruct;
}
}
[DllImport("PdWaveBase.dll", EntryPoint = "PDPreProcess")]
public static extern int PDPreProcess(int nSample, ref PDWaveBurst pWaveBurst);
[DllImport("PdWaveBase.dll", EntryPoint = "PDProcessReturnInt")]
public static extern int PDProcessReturnInt();
public void PreprocessBurstData(int nSamples)
{
PdWaveApi.PDWaveBurst WaveBurstData = PdWaveApi.PDWaveBurst.Create();
WaveBurstData.fST = new float[4096];
WaveBurstData.fWinFloor = (float)1.25;
WaveBurstData.fWinCeil = 2;
WaveBurstData.bUseWindow = false;
WaveBurstData.bSTOk = false;
WaveBurstData.bGetRawAST = false;
WaveBurstData.bValidBurst = false;
PdWaveBaseLWrapper.PDPreProcess(nSamples, ref WaveBurstData);
}
public void ProcessData()
{
int ProcessError = PdWaveBaseLWrapper.PDProcessReturnInt();
}
5) 从 C++ 库中读取结果
[StructLayout(LayoutKind.Sequential)]
public struct PDWavePar {
public float fTm02;
public float fTp;
public float fDirTp;
public float fSprTp;
public float fMainDir;
public float fUI;
public float fHm0;
public float fH3;
public float fT3;
public float fH10;
public float fT10;
public float fHmax;
public float fTmax;
public float fTz;
public float fMeanPres;
public int nNumNoDet;
public int nNumBadDet;
public int nErrCode;
public int nSpectrum;
public float fMeanAST;
}
[DllImport("PdWaveBase.dll", EntryPoint = "PDGetWavePar")]
public static extern int PDGetWavePar(ref PDWavePar pwWavePar);
public void GetOutput()
{
PdWaveApi.PDWavePar WaveParameters = new PdWaveApi.PDWavePar();
PdWaveBaseLWrapper.PDGetWavePar(ref WaveParameters);
}
所以，作为结论：
我应该在我的代码中进行哪些更改 - 将数据正确传递给非托管 dll - 让 dll 保存并处理其内部结构中的数据 - 将结果从非托管代码正确读取到我的 C# 程序？
（对不起我的问题的长度。）