IOCP _2

最新推荐文章于 2021-02-24 06:42:27 发布

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最新推荐文章于 2021-02-24 06:42:27 发布

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分类专栏： c++ 文章标签： socket buffer io winapi struct null

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本文详细介绍了使用iocpServer2进行Windows Socket编程的方法，包括初始化套接字库、创建完成端口对象、处理完成端口事件、创建监听套接字、绑定本地地址、开始监听并处理进来的连接等核心步骤。

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// iocpServer2.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include <WinSock2.h>
//#include <MSWSock.h>
#pragma comment(lib,"Ws2_32.lib")

#define BUFFER_SIZE 1024

void InitSocket(BYTE minorVer = 2, BYTE majorVer = 2)
{
	//初始化 WS2_32.dll
	WSADATA wsaData;
	WORD sockVertion = MAKEWORD(minorVer, majorVer);
	if (::WSAStartup(sockVertion, &wsaData) != 0)
	{
		exit(0);
	}
}

void ClearSocket()
{
	::WSACleanup();
}

typedef struct _PER_HANDLE_DATA //per-handle 数据
{
	SOCKET s;//对应的套接字句柄
	sockaddr_in addr;//客户方地址
} PER_HANDLE_DATA, *PPER_HANDLE_DATA;

typedef struct _PER_IO_DATA //per-I/O 数据
{
	OVERLAPPED ol; //重叠数据结构
	char buf[BUFFER_SIZE]; //数据缓冲区
	int nOperationType; //操作类型
#define OP_READ   1
#define OP_WRITE  2
#define OP_ACCEPT 3
}PER_IO_DATA, *PPER_IO_DATA;

DWORD WINAPI ServerThread(LPVOID lpParam)
{
	//得到完成端口句柄
	HANDLE hCompletion = (HANDLE)lpParam;
	DWORD dwTrans;
	PPER_HANDLE_DATA pPerHandle;
	PPER_IO_DATA pPerIO;
	while (TRUE)
	{
		//在关联到此端口的所有套接字上等待I/O完成
		BOOL bOK = ::GetQueuedCompletionStatus(hCompletion, &dwTrans, (LPDWORD)&pPerHandle, (LPOVERLAPPED*)&pPerIO, WSA_INFINITE);
		if (!bOK)//在此套接字上有错
		{
			::closesocket(pPerHandle->s);
			::GlobalFree(pPerHandle);
			::GlobalFree(pPerIO);
			continue;
		}

		if (dwTrans == 0 && (pPerIO->nOperationType == OP_READ || pPerIO->nOperationType ==OP_WRITE))//套接字被对方关闭
		{
			::closesocket(pPerHandle->s);
			::GlobalFree(pPerHandle);
			::GlobalFree(pPerIO);
			continue;
		}
		switch(pPerIO->nOperationType) //通过 per-I/O数据中的nOperationType 域
		{
		case OP_READ://完成一个接收请求
			{
				pPerIO->buf[dwTrans] = '\0';
				printf(pPerIO->buf);
				//继续投递接收I/O请求
				WSABUF buf;
				buf.buf = pPerIO->buf;
				buf.len = BUFFER_SIZE;
				pPerIO->nOperationType = OP_READ;
				DWORD nFlags = 0;
				::WSARecv(pPerHandle->s, &buf, 1, &dwTrans, &nFlags, &pPerIO->ol, NULL);
				break;
			}
		case OP_WRITE://
		case OP_ACCEPT:
			break;
		}
	}
	return 0;
}
int _tmain(int argc, _TCHAR* argv[])
{
	InitSocket();//初始化套接字库
	int nPort = 4567;
	//创建完成端口对象，创建工作线程处理完成端口事件
	HANDLE hCompletion = ::CreateIoCompletionPort(INVALID_HANDLE_VALUE, 0, 0,0);
	::CreateThread(NULL, 0, ServerThread, (LPVOID)hCompletion, 0, 0);
	//创建监听套接字，绑定本地地址，开始监听
	SOCKET sListen = ::socket(AF_INET, SOCK_STREAM, 0);
	SOCKADDR_IN si;
	si.sin_family = AF_INET;
	si.sin_port = ::ntohs(nPort);
	si.sin_addr.S_un.S_addr = INADDR_ANY;
	::bind(sListen, (sockaddr*)&si, sizeof(si));
	::listen(sListen, 5);
	//循环处理进来的连接
	while(TRUE)
	{
		//等待接受未决的连接请求
		SOCKADDR_IN saRemote;
		int nRemoteLen = sizeof(saRemote);
		SOCKET sNew = ::accept(sListen, (sockaddr*)&saRemote, &nRemoteLen);
		//接受到新连接之后，为它创建一个per-handle 数据，并将它们关联到完成端口对象
		PPER_HANDLE_DATA pPerHandle = (PPER_HANDLE_DATA)::GlobalAlloc(GPTR,sizeof(PPER_HANDLE_DATA));
		pPerHandle->s = sNew;
		memcpy(&pPerHandle->addr, &saRemote, nRemoteLen);
		::CreateIoCompletionPort((HANDLE)pPerHandle->s, hCompletion, (DWORD)pPerHandle, 0);
		//投递一个接收请求
		PPER_IO_DATA pPerIO = (PPER_IO_DATA)::GlobalAlloc(GPTR, sizeof(PER_IO_DATA));
		pPerIO->nOperationType = OP_READ;
		WSABUF buf;
		buf.buf = pPerIO->buf;
		buf.len = BUFFER_SIZE;
		DWORD dwRecv;
		DWORD dwFlags = 0;
		::WSARecv(pPerHandle->s, &buf, 1, &dwRecv, &dwFlags, &pPerIO->ol, NULL);
	}
	return 0;
}