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标题:
一个简单的C语言的socket服务器和客户端程序
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作者:
admin
时间:
2020-5-9 02:14
标题:
一个简单的C语言的socket服务器和客户端程序
程序很简单,windows环境下的,客户端和服务器程序都在本机运行,在客户端输入发送给服务器的字符串,服务器收到字符串后会打印出来,同时与"abc"比较,与"abc"相同就会返给客户端,输入的是正确的,不同会告诉客户端输入时错误的。
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客户端程序:client.cpp
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#include <winsock2.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define DEFAULT_PORT 5150
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#define DEFAULT_BUFFER 2048
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char szServer[128],
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szMessage[1024];
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int iPort = DEFAULT_PORT;
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int main()
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{
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WSADATA wsd;
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SOCKET sClient;
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char szBuffer[DEFAULT_BUFFER];
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int ret;
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struct sockaddr_in server;
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struct hostent *host = NULL;
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if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
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{
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printf("Failed to load Winsock library!\n");
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return 1;
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}
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printf("Enter a string to send to server:\n");
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gets(szMessage);
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// Create the socket, and attempt to connect to the server
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sClient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (sClient == INVALID_SOCKET)
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{
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printf("socket() failed: %d\n", WSAGetLastError());
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return 1;
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}
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server.sin_family = AF_INET;
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server.sin_port = htons(iPort);
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server.sin_addr.s_addr = inet_addr("127.0.0.1");
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if (connect(sClient, (struct sockaddr *)&server,
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sizeof(server)) == SOCKET_ERROR)
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{
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printf("connect() failed: %d\n", WSAGetLastError());
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return 1;
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}
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// Send and receive data
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ret = send(sClient, szMessage, strlen(szMessage), 0);
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if (ret == SOCKET_ERROR)
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{
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printf("send() failed: %d\n", WSAGetLastError());
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}
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else{
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printf("Send '%s' \n", szMessage);
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ret = recv(sClient, szBuffer, DEFAULT_BUFFER, 0);
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if (ret == SOCKET_ERROR){
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printf("recv() failed: %d\n", WSAGetLastError());
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}
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else{
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szBuffer[ret] = '\0';
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printf("RECV: '%s'\n",szBuffer);
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}
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}
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closesocket(sClient);
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WSACleanup();
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return 0;
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}
复制代码
服务器程序:server.cpp
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#include <winsock2.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define DEFAULT_PORT 5150
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#define DEFAULT_BUFFER 4096
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int iPort = DEFAULT_PORT;
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char szAddress[128];
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DWORD WINAPI ClientThread(LPVOID lpParam)
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{
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SOCKET sock=(SOCKET)lpParam;
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char szBuff[DEFAULT_BUFFER];
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int ret;
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while(1)
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{
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ret = recv(sock, szBuff, DEFAULT_BUFFER, 0);
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if (ret == 0)
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break;
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else if (ret == SOCKET_ERROR)
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{
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printf("recv() failed: %d\n", WSAGetLastError());
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break;
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}
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szBuff[ret] = '\0';
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printf("RECV: '%s'\n", szBuff);
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if(strcmp(szBuff,"abc")==0){
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memcpy(szBuff,"Send the correct string!",25);
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}
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else{
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memcpy(szBuff,"Send the wrong string!",23);
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}
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ret = send(sock, szBuff, strlen(szBuff), 0);
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if (ret == SOCKET_ERROR){
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printf("send() failed: %d\n", WSAGetLastError());
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}
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}
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return 0;
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}
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int main()
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{
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WSADATA wsd;
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SOCKET sListen,
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sClient;
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int iAddrSize;
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HANDLE hThread;
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DWORD dwThreadId;
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struct sockaddr_in local,
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client;
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if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
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{
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printf("Failed to load Winsock!\n");
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return 1;
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}
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// Create our listening socket
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sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
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if (sListen == SOCKET_ERROR)
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{
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printf("socket() failed: %d\n", WSAGetLastError());
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return 1;
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}
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local.sin_addr.s_addr = htonl(INADDR_ANY);
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local.sin_family = AF_INET;
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local.sin_port = htons(iPort);
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if (bind(sListen, (struct sockaddr *)&local,
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sizeof(local)) == SOCKET_ERROR)
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{
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printf("bind() failed: %d\n", WSAGetLastError());
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return 1;
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}
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listen(sListen, 8);
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// In a continous loop, wait for incoming clients. Once one
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// is detected, create a thread and pass the handle off to it.
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while (1)
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{
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iAddrSize = sizeof(client);
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sClient = accept(sListen, (struct sockaddr *)&client,
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&iAddrSize);
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if (sClient == INVALID_SOCKET)
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{
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printf("accept() failed: %d\n", WSAGetLastError());
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break;
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}
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printf("Accepted client: %s:%d\n",
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inet_ntoa(client.sin_addr), ntohs(client.sin_port));
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hThread = CreateThread(NULL, 0, ClientThread,
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(LPVOID)sClient, 0, &dwThreadId);
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if (hThread == NULL)
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{
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printf("CreateThread() failed: %d\n", GetLastError());
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break;
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}
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CloseHandle(hThread);
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}
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closesocket(sListen);
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WSACleanup();
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return 0;
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}
复制代码
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作者:
admin
时间:
2020-5-9 02:16
作为服务器,你要绑定【bind】到本地的IP地址上进行监听【listen】,但是你的机器上可能有多块网卡,也就有多个IP地址,这时候你要选择绑定在哪个IP上面,如果指定为INADDR_ANY,那么系统将绑定默认的网卡【即IP地址】。
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作为客户端,你要连接【connect】到远端的服务器,也是要指定远端服务器的(ip, port)对。
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当然,在这种情况下,不可能将IP地址指定为INADDR_ANY,系统会疯掉的。
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Server:
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#include <winsock2.h>
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#pragma comment(lib, "WS2_32.lib")
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#include <stdio.h>
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void main()
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{
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WORD wVersionRequested;//版本号
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WSADATA wsaData;
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int err;
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wVersionRequested = MAKEWORD(2, 2);//2.2版本的套接字
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//加载套接字库,如果失败返回
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err = WSAStartup(wVersionRequested, &wsaData);
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if (err != 0)
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{
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return;
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}
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//判断高低字节是不是2,如果不是2.2的版本则退出
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if (LOBYTE(wsaData.wVersion) != 2 ||
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HIBYTE(wsaData.wVersion) != 2)
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{
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return;
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}
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//创建流式套接字,基于TCP(SOCK_STREAM)
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SOCKET socSrv = socket(AF_INET, SOCK_STREAM, 0);
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//Socket地址结构体的创建
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SOCKADDR_IN addrSrv;
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addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);//转换Unsigned long型为网络字节序格
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addrSrv.sin_family = AF_INET;//指定地址簇
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addrSrv.sin_port = htons(6000);
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//指定端口号,除sin_family参数外,其它参数都是网络字节序,因此需要转换
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//将套接字绑定到一个端口号和本地地址上
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bind(socSrv, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));//必须用sizeof,strlen不行
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listen(socSrv, 5);
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SOCKADDR_IN addrClient;//字义用来接收客户端Socket的结构体
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int len = sizeof(SOCKADDR);//初始化参数,这个参数必须进行初始化,sizeof
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//循环等待接受客户端发送请求
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while (1)
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{
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//等待客户请求到来;当请求到来后,接受连接请求,
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//返回一个新的对应于此次连接的套接字(accept)。
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//此时程序在此发生阻塞
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SOCKET sockConn = accept(socSrv, (SOCKADDR*)&addrClient, &len);
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char sendBuf[100];
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sprintf(sendBuf, "Welcome %s to JoyChou",
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inet_ntoa(addrClient.sin_addr));//格式化输出
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//用返回的套接字和客户端进行通信
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send(sockConn, sendBuf, strlen(sendBuf)+1, 0);//多发送一个字节
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//接收数据
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char recvBuf[100];
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recv(sockConn, recvBuf, 100, 0);
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printf("%s\n", recvBuf);
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closesocket(sockConn);
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}
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}
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Client:
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#include <winsock2.H>
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#pragma comment(lib, "Ws2_32.lib")
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#include <stdio.h>
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#include <string.h>
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void main()
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{
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WORD wVersionRequested;
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WSADATA wsaData;
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int err;
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wVersionRequested = MAKEWORD( 2, 2 );
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err = WSAStartup( wVersionRequested, &wsaData );
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if ( err != 0 ) {
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return;
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}
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if ( LOBYTE( wsaData.wVersion ) != 2 ||
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HIBYTE( wsaData.wVersion ) != 2 )
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{
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WSACleanup( );
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return;
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}
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SOCKET socketClient = socket(AF_INET, SOCK_STREAM, 0);
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SOCKADDR_IN addrSrv;
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addrSrv.sin_family = AF_INET;
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addrSrv.sin_port = htons(6000);
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addrSrv.sin_addr.S_un.S_addr = inet_addr("192.168.1.101");//服务器端的IP地址
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connect(socketClient, (SOCKADDR *)&addrSrv, sizeof(SOCKADDR));
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char recvBuf[256];
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char sendBuf[] = "This is Joychou";
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recv(socketClient, recvBuf, 256, 0);
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printf("%s\n", recvBuf);
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send(socketClient, sendBuf, strlen(sendBuf) + 1, 0);
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closesocket(socketClient);
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WSACleanup();
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}
复制代码
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