C++ 以引用作为参数的函数原型：
Int paramscal(double *vsrc,double *csrc,double& Volt_freq,double&Volt_RMS,double&Curren_freq,double&Current_RMS,double&thata);
别人在C++中调用示例：
     double *tempV=new double[2500];
     double *tempC=new double[2500];
     tempV=filtereddata(m_Power_V,1);
     tempC=filtereddata(m_Power_C,1);
    double Volt_freq;
    double Volt_RMS;
    double Curren_freq;
    double Current_RMS;
    double thata;
int aa=paramscal(tempV,tempC,Volt_freq,Volt_RMS,Curren_freq,Current_RMS,thata);
  如果 aa==1则成功。
我在C#中的调用：
 [DllImport("sigproc.dll", EntryPoint = "paramscal", SetLastError = true, CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
  unsafe public static extern int paramscal(double* vsrc, double* csrc, ref double Volt_freq, ref double Volt_RMS, ref double Curren_freq, ref double Current_RMS, ref double thata);

 double[] tempV = ClassGetData.GetData(d,1);
 double[] tempI = ClassGetData.GetData(d, 1);

 fixed (double* k = &tempV[0])
            {
                fixed (double* k1 = &tempI[0])
                {
                    //定义变量
                    double Volt_freq=50;
                    double Volt_RMS=50;
                    double Curren_freq=100;
                    double Current_RMS=10;
                    double thata=0;
                    int aa = paramscal(k, k1, ref Volt_freq, ref Volt_RMS, ref Curren_freq, ref Current_RMS, ref thata);
                }

            }
       出现错误见附件：

 

这种写法完全通过测试，返回值就是对应的 Volt_freq，Volt_RMS，Curren_freq，Current_RMS，thata；