Question

我正在为C＃实现C ++ Dll。但是当我运行我的程序时，会发生AccessViolationException。这是代码。在C ++中：

extern "C" DLLIMPORT double __cdecl ErrorCalculate(double* pBufferA, double* pBufferB,__int32 length)
{
    __m128d xfdLoadA;
    __m128d xfdLoadB;
    const double* pA = pBufferA;
    const double* pB = pBufferB;

    //do somthing

    for(int i=0;i<length/2;i++)
    {

        xfdLoadA = _mm_load_pd(pA);//error occur at this line
        xfdLoadB = _mm_load_pd(pB);

        pA+=2;
        pB+=2;
        //  do somthing
    }
    //  do somthing
}

在C＃中

：

[DllImport("test.dll", EntryPoint = "ErrorCalculate", CallingConvention = CallingConvention.Cdecl)]
    static extern double ErrorCalculate(double[] pBufferA, double[] pBufferB, int length);

public void frameProcessing(Image<Gray, byte> frame){
    //do something

    SSE4 sse4 = new SSE4();
    unsafe
    {
        //length of samplePoint is the same as tempPoint
        fixed (double* sample = samplePoint)
        {
            fixed (double* test = tempPoint)
            {
                errorSum = sse4.ErrorCalc(sample, test, length);
            }
        }
    }

    if(errorSum<=threshold)
    {//do something}
}

frameProcessing将被多次调用。有时错误将在我第一次调用frameProcessing时发生，有时是第二次。我发现错误发生在_mm_load_pd（pA）。我确定pA和pB不为空（可以打印出两个数组的值）。任何帮助将不胜感激。

在C＃上调用C ++ dll时出现AccessViolationException

0 个答案: