各位，C++的dll 在C#中的调用总是出错！
C++中调用的代码，可以正常实现：

//PCO_SensorInfo 是一个结构体
  PCO_SensorInfo strsensorinf;
  
  memset((void*)&strsensorinf.wSize, 0, sizeof(PCO_SensorInfo));
  strsensorinf.wSize = sizeof(PCO_SensorInfo);// Set size of structure
  strsensorinf.iConversionFactor = 8;  // Set conversion factor of camera
  strsensorinf.iDarkOffset = 32;       // Set dark offset of camera 
  strsensorinf.iDataBits = 12;         // Set bit resolution of camera
  //// Set color type and alignment of image data.
  strsensorinf.iSensorInfoBits = CONVERT_SENSOR_COLORIMAGE;// Set color camera type; 
  m_hLut = NULL;  //m_hLut 是void* 型的
  //调用dll
  int err = PCO_ConvertCreate(&m_hLut, (PCO_SensorInfo*)&strsensorinf.wSize, 2);

C++ dll

int PCOCONVERT_API PCO_ConvertCreate(HANDLE* ph, PCO_SensorInfo *strSensor, int iConvertType);

上面可以正常实现！

C#代码：

   CSharpDemo.sc2_cam.PCO_SensorInfo strsensorinf = new sc2_cam.PCO_SensorInfo();
            strsensorinf.wSize =(ushort)(Marshal.SizeOf(typeof(CSharpDemo.sc2_cam.PCO_SensorInfo)));// Set size of structure
            strsensorinf.iConversionFactor = 8;  // Set conversion factor of camera
            strsensorinf.iDarkOffset = 32;       // Set dark offset of camera
            strsensorinf.iDataBits = 12;         // Set bit resolution of camera
             //Set color type and alignment of image data.
            strsensorinf.iSensorInfoBits = 1;// Set color camera type; 
            strsensorinf.dwzzDummy1 = new uint[38];
            m_hLut = new IntPtr();
            //这里该怎么调用？
            int err = sc2_cam.PCO_ConvertCreate(ref m_hLut, ref strsensorinf, 2);

C#dll:

[DllImport("PCO_Conv.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
        public static extern  int PCO_ConvertCreate(ref IntPtr hdriver, ref PCO_SensorInfo sensorInfo, int iConvertType);

(这样引用对吗？)
上述C++代码是可以正常调用的！请大家指教一下，看看C#的地方怎么弄？总是调用不成功！先谢过了！

[解决办法]
前提是要先把PCO_Conv.dll给注册了
[解决办法]
这个不好说，必须有导出函数的原型才知道。

另外是不是调用约定搞错了，默认是stdcall的，你的C++默认是cdecl的。

贴出具体的错误信息。
[解决办法]
没注意到你是传结构
这样就要修改一下了?

如下?

[StructLayout(LayoutKind.Sequential)]
public struct PCO_SensorInfo
{
 ...
  // 你的定义
}

[DllImport("PCO_Conv.dll", EntryPoint = "PCO_ConvertCreate", CharSet = CharSet.Ansi)]
 public static extern int PCO_ConvertCreate(IntPtr hdriver, ref PCO_SensorInfo sensorInfo, int iConvertType);
 };