如何将双精度数组从C#传递到C ++(DLL) [英] How to pass Array of doubles from C# to C++ (DLL)

问题描述

C ++函数签名为:

the C++ function signature is:

int Eye_GetPositionSC2(std::string fname_mob, double sensors[9], int &map_x, int &map_y)

C#函数签名为:

[DllImport(@"eyeWhere.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode)]
public static extern int Eye_GetPositionSC2([MarshalAs(UnmanagedType.LPWStr)]string filename, [In , MarshalAs(UnmanagedType.LPArray)]double[] sensors)

代码编译良好，但是在将double数组传递给函数时存在"AccessViolationexception".

the code is compiling good but there is an "AccessViolationexception" while passing the double array to the function.

推荐答案

您不能从C#调用该函数.它接受不能用于互操作的std::string.您还从C#转换中省略了两个参数.

You cannot call that function from C#. It accepts a std::string which cannot be used for interop. You also omitted two parameters from your C# translation.

C ++代码应为:

int Eye_GetPositionSC2(
    const wchar_t* filename, 
    double sensors[9], 
    int &map_x, 
    int &map_y
)

C#代码应为:

[DllImport(@"eyeWhere.dll", CallingConvention = CallingConvention.Cdecl,
    CharSet = CharSet.Unicode)]
public static extern int Eye_GetPositionSC2(
    string filename, 
    [In, MarshalAs(UnmanagedType.LPArray, SizeConst = 9)]
    double[] sensors,
    ref int map_x,
    ref int map_y
)

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