C#与OpenCVC++导出DLL调用与数据交互

第一：在VS中建立一个C++ DLL空项目第二：构建C++ DLL的代码或者类库第三：声明导出函数接口与实现

#pragma once
#ifdef _DLL_EXPORTS#define DLL_API _declspec(dllexport)#else#define DLL_API _declspec(dllimport)#endif
#include 
//=========导出函数C++调用接口============class DLL_API MyTestDLL {public:  int addData(int a, int b);  ~MyTestDLL();};

#define _DLL_EXPORTS#include 
MyTestDLL::~MyTestDLL() {std::cout << "destory instance done!" << std::endl;}
int MyTestDLL::addData(int a, int b) {  int sum = 0;  sum = a + b;  std::cout << "sum: " << sum << std::endl;  return sum;}

extern "C" __declspec(dllexport) void* __stdcall createInstance();extern "C" __declspec(dllexport) bool __stdcall addData(void* p, int a, int b);

extern "C" __declspec(dllexport) bool __stdcall mergeImg(uchar * src, int w, int h);

[DllImport("your_test_name.dll")]static extern bool mergeImg(IntPtr src, int w, int h);

extern "C" __declspec(dllexport) int __stdcall addData(int a, int b);

[DllImport("your_test_name.dll")]static extern int addData(int a, int b);

struct MyStruct {  int age = 23;  bool gender=false;};

extern "C" __declspec(dllexport) void __stdcall getYourStructInfos(MyStruct* infos);

struct MyStruct {  public int age;  public bool gender;};

[DllImport("your_test_name.dll")]static extern void getYourStructInfos([In, Out] MyStruct[] infos);

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