完成端口最最最基本的理解

完成端口最最最基本的理解

// IOCP_Learn.cpp : Defines the entry point for the console application.

//

#include "stdafx.h"

#include <iostream>

#include <WinSock2.h>

// 根据某结构体中一个成员的地址，计算出外层结构体的地址

//CONTAINING_RECORD

class CTest_CONTAINING_RECORD

{

public:

    void Test()

    {

        CTest_CONTAINING_RECORD* pTest = CONTAINING_RECORD(&m_i, CTest_CONTAINING_RECORD, m_i);

        std::cout << reinterpret_cast<unsigned int>(this) << std::endl;

        std::cout << reinterpret_cast<unsigned int>(pTest) << std::endl;

    }

private:

    int m_i;

};

//OVERLAPPED

namespace iocp

{

enum EM_IOCP_OP_TYPE

{

    emIOCP_POST_SEND = 0, 

    emIOCP_POST_ASYNC_RECV,

    emIOCP_POST_ACCEPT,

    emIOCP_DISSCONNECT

};

};//~ end of namespace iocp

// 直接继承OVERLAPPED，根据C++对象的内存布局可以确定stIOCP_OVERLAPPED和static_cast<OVERLAPPED>(obj_stIOCP_OVERLAPPED)

// 是一样的

struct stIOCP_OVERLAPPED : public OVERLAPPED

{

    WSABUF wsabuf;

    EM_IOCP_OP_TYPE optype;

};

// 还有一个是关联的key，没有提到，以及关联socket句柄和完成提示

int _tmain(int argc, _TCHAR* argv[])

{

    CTest_CONTAINING_RECORD test;

    test.Test();

return 0;

}