第9篇c#调用c++动态库报错处理

txwtech2025-09-02 8:38

1.报错System.DllNotFoundException

编译c++库如果是x64,c#项目也选x64

c++

c#项目

2.报错System.BadImageFormatException

c#项目属性设置：目标平台x64

编译后，bin目录生成x64文件夹

拷贝c++库到此目录,c++如果依赖其它库也一并拷贝

3.System.AccessViolationException

c#传参数：string给c++函数，或接收返回字符串时，字符串需转换

c++的函数

std::string转char*

td::string str_data = "abcdefg";

char* charArr = new char $str_data.length() + 1$ ;

strcpy(charArr, str_data.c_str());

char*转std:string

char* aa ="abdefg";

std::string str = aa;

char*可直接接收c# string

复制代码

char* __stdcall ImgRotate(char* charstr, int degree)
    {
        std::string imgPath = charstr;
       //const char* chardata = c_Obj.ImgRotate(imgPath, degree).c_str();
        std::string str_data = c_Obj.ImgRotate(imgPath, degree);
        char* charArr = new char[str_data.length() + 1];
        strcpy(charArr, str_data.c_str());
      //  strcpy_s(charArr, sizeof(charArr), str_data.c_str());

        return charArr;
        
    }

c#调用

复制代码

[DllImport("CdtxwVisionLibNet.dll")]
        private static extern int Add(int n1, int n2);
        [DllImport("CdtxwVisionLibNet.dll",EntryPoint = "ImgRotate",CharSet=CharSet.Ansi,CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr ImgRotate(string path,int degree);

c#IntPtr对应c++的char*

调用方法: