＜winsock＞重叠IO模型

 基于事件判断io完成

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send程序

#include <stdio.h>
#include <winsock2.h>#pragma comment(lib, "Ws2_32.lib")
#pragma warning(disable : 4996)int main()
{WSADATA wsaData;if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0){printf("WSAStartup 失败\n");system("pause");return 1;}// 创建 重叠模型的套接字SOCKET HSocket = WSASocket(PF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);if (HSocket == INVALID_SOCKET){printf("WSASocket 失败\n");WSACleanup();system("pause");return -1;}//和往常一样创建客户端连接sockaddr_in SendAddr;memset(&SendAddr, 0, sizeof(SendAddr));SendAddr.sin_family = AF_INET;SendAddr.sin_port = htons(4567); // 服务器端口SendAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); // 服务器 IP本地还回地址if (connect(HSocket, (LPSOCKADDR)&SendAddr, sizeof(SendAddr)) == SOCKET_ERROR){printf("WSASocket 失败\n");WSACleanup();system("pause");return -1;}//创建一个初始无信号手动重置的事件对象WSAEVENT evobj = WSACreateEvent();//创建一个WSAOVERLAPPED 结构体变量WSAOVERLAPPED overlapped;memset(&overlapped, 0, sizeof(overlapped));overlapped.hEvent = evobj;//保存待传输的数据大小 和数据存储的地址WSABUF dataBuf;char msg[] = "网络编程";dataBuf.buf = msg;dataBuf.len = strlen(msg) + 1;//保存实际发送字节数DWORD sendedBytes = 0;//开始传输数据//如果不返回SOCKET_ERROR,说明数据已经传输完成了if (WSASend(HSocket, &dataBuf, 1, &sendedBytes, 0, &overlapped, NULL) == SOCKET_ERROR){   //判断错误码是不是WSA_IO_PENDING,说明数据没有传输完成if (WSAGetLastError() == WSA_IO_PENDING){puts("正在后台传输数据中");//永久等待 一个事件WSAWaitForMultipleEvents(1, &evobj, TRUE, WSA_INFINITE, FALSE);//事件有信号了,用这个函数获得io处理的结果.如果fwait设置为true,将等待io的完成,函数阻塞;如果设置为false并且调用时io的未完成 ,函数立即返回falseBOOL isok= WSAGetOverlappedResult(HSocket, &overlapped, &sendedBytes, FALSE, NULL);if(!isok){printf("WSAGetOverlappedResult 失败 %d\n",WSAGetLastError());}}else{printf("WSASend 失败 %d\n", WSAGetLastError());}}printf("发送了%d 个字节\n", sendedBytes);WSACloseEvent(evobj);closesocket(HSocket);WSACleanup();return 0;
}

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recvicer程序

#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "Ws2_32.lib")
#pragma warning(disable : 4996)
#define BUFFER_SIZE 1024
int main(int argc, char* argv[])
{WSADATA initsock;if (WSAStartup(MAKEWORD(2, 2), &initsock) != 0){printf("WSAStartup失败		");return -1;}//创建重叠模型套接字SOCKET s = WSASocket(PF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);if (s == INVALID_SOCKET){printf("socket失败");return -1;}
#pragma region 经典起手式 设置端口和ip 并绑定服务器套接字,进入监听,并允许连接//设置ip和端口sockaddr_in servAddr;servAddr.sin_family = AF_INET;servAddr.sin_port = htons(4567);servAddr.sin_addr.S_un.S_addr = INADDR_ANY;//绑定套接字if (bind(s, (LPSOCKADDR)&servAddr, sizeof(servAddr)) == SOCKET_ERROR){printf("bind失败");closesocket(s);WSACleanup();return -1;}//进入监听if (listen(s, 5) == SOCKET_ERROR){printf("listen失败%d\n",WSAGetLastError());closesocket(s);WSACleanup();return -1;}sockaddr_in clintAddr;int lenOfclintAddr= sizeof(clintAddr);SOCKET hClintSock = accept(s, (LPSOCKADDR)&clintAddr, &lenOfclintAddr);if (hClintSock == INVALID_SOCKET){printf("accept失败%d\n", WSAGetLastError());closesocket(s);WSACleanup();return -1;}
#pragma endregion//创建手动重置初始无信号的事件对象,将地址保存到OVERLAPPED结构变量中WSAEVENT evObj = WSACreateEvent();OVERLAPPED overlapped;memset(&overlapped, 0, sizeof(overlapped));overlapped.hEvent = evObj;//保存数据的缓冲区WSABUF dataBuf;char buf[BUFFER_SIZE] = { 0 };dataBuf.len = BUFFER_SIZE;dataBuf.buf = buf;//WSARecv函数返回时,接收的数据字节数DWORD recvBytes = 0;//传输特性 DWORD flags = 0;if (WSARecv(hClintSock, &dataBuf, 1, &recvBytes, &flags, &overlapped, NULL) == SOCKET_ERROR){if (WSAGetLastError() == WSA_IO_PENDING){puts("后台接收数据中");WSAWaitForMultipleEvents(1, &evObj, true, WSA_INFINITE, false);WSAGetOverlappedResult(hClintSock, &overlapped, &recvBytes, FALSE, NULL);}else{printf("WSARecv失败%d\n", WSAGetLastError());WSACloseEvent(evObj);closesocket(s);WSACleanup();return -1;}}printf("接收到消息:%s\n", buf);WSACloseEvent(evObj);closesocket(s);WSACleanup();return 0;
}

基于apc的回调函数通知io完成 的recvicer

#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "Ws2_32.lib")
#pragma warning(disable : 4996)
#define BUFFER_SIZE 1024
//WSARecv函数返回时,接收的数据字节数
DWORD g_recvBytes = 0;
char g_buf[BUFFER_SIZE];
void  CompRoutine(IN DWORD dwError,IN DWORD cbTransferred,IN LPWSAOVERLAPPED lpOverlapped,IN DWORD dwFlags
);
int main(int argc, char* argv[])
{WSADATA initsock;if (WSAStartup(MAKEWORD(2, 2), &initsock) != 0){printf("WSAStartup失败		");system("pause");return -1;}//创建重叠模型套接字SOCKET s = WSASocket(PF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);if (s == INVALID_SOCKET){printf("socket失败");system("pause");return -1;}
#pragma region 经典起手式 设置端口和ip 并绑定服务器套接字,进入监听,并允许连接//设置ip和端口sockaddr_in servAddr;servAddr.sin_family = AF_INET;servAddr.sin_port = htons(4567);servAddr.sin_addr.S_un.S_addr = INADDR_ANY;//绑定套接字if (bind(s, (LPSOCKADDR)&servAddr, sizeof(servAddr)) == SOCKET_ERROR){printf("bind失败");closesocket(s);WSACleanup();system("pause");return -1;}//进入监听if (listen(s, 5) == SOCKET_ERROR){printf("listen失败%d\n", WSAGetLastError());closesocket(s);WSACleanup();system("pause");return -1;}sockaddr_in clintAddr;int lenOfclintAddr = sizeof(clintAddr);SOCKET hClintSock = accept(s, (LPSOCKADDR)&clintAddr, &lenOfclintAddr);if (hClintSock == INVALID_SOCKET){printf("accept失败%d\n", WSAGetLastError());closesocket(s);WSACleanup();system("pause");return -1;}
#pragma endregion//这个事件只是为了让当前线程进入可警报状态WSAEVENT evObj = WSACreateEvent();OVERLAPPED overlapped;memset(&overlapped, 0, sizeof(overlapped));//保存数据的缓冲区WSABUF dataBuf;dataBuf.len = BUFFER_SIZE;dataBuf.buf = g_buf;//传输特性 DWORD flags = 0;if (WSARecv(hClintSock, &dataBuf, 1, &g_recvBytes, &flags, &overlapped,(LPWSAOVERLAPPED_COMPLETION_ROUTINE)CompRoutine) == SOCKET_ERROR){if (WSAGetLastError() == WSA_IO_PENDING){puts("后台接收数据中");}}//只是为了假装自己进入了等待状态,,,,,APC函数将唤醒 这个线程//因为我在等待/*DWORD ret=WSAWaitForMultipleEvents(1, &evObj, FALSE, WSA_INFINITE, TRUE);if (ret == WAIT_IO_COMPLETION){printf("io传输已完成");}*/DWORD ret = SleepEx(INFINITE, TRUE);if (ret == WAIT_IO_COMPLETION){printf("io传输已完成");}WSACloseEvent(evObj);closesocket(s);WSACleanup();system("pause");return 0;
}
//本程序  将会由于调用约定错误  而引发c0005异常
// vs中设置的调用约定默认为 __cdecl (/Gd)
void  CompRoutine(IN DWORD dwError,IN DWORD cbTransferred,IN LPWSAOVERLAPPED lpOverlapped,IN DWORD dwFlags
)
{if (dwError!=0){printf("完成回调函数失败\n");}else{g_recvBytes = cbTransferred;printf("接收到的消息:%s",g_buf);}
}