如何通过DllImport将双精度数组从C＃传递到C ++

您不能与C ++类（例如std::vector）进行互操作，而只能与基本的C样式数据类型和指针进行互操作。（作为旁注）这是Microsoft发明COM时试图解决的问题之一。

为了使其工作，您应该导出一个不同的函数，该函数接收纯C数组及其各自的长度：

C ++方面

extern "C" __declspec(dllexport) int MyExternMethod(
    double *tissue, int tissueLen, 
    double *bg, int bgLen,
    /* ... the rest ... */
);

// implementation
int MyExternMethod(
    double* tissue, int tissueLen, 
    double* bg, int bgLen,
    /* ... the rest ... */ )
{
    // call your original method from here:

    std::vector<double> tissueData(tissue, tissue + tissueLen);
    std::vector<double> bgData(bg, bg + bgLen);
    /* ... the rest ... */

    return MyMethod(tissueData, bgData, /* ...the rest... */);
}

C＃端的互操作导入为：

C＃面

public static class MyLibMethods
{
    [DllImport("MyLib.dll", CallingConvention = CallingConvention.Cdecl)]
    public static extern int MyExternMethod(
        double[] tissue, int tissueLen,
        double[] bg, int bgLen,
        /*...the rest...*/
    );
}

您可以像这样在C＃中调用它：

C＃面

public int CallMyExternMethod(double[] tissue, double[] bg, /*... the rest ...*/)
{
    return MyLibMethods.MyExternMethod(
        tissue, tissue.Length,
        bg, bg.Length,
        /*...the rest...*/
    );
}