Windows下C语言的Socket编程例子（TCP和UDP）
一。 <TCP>
server端：
1 #include "stdafx.h" 2 #include <stdio.h> 3 #include <winsock2.h> 4 5 #pragma comment(lib,"ws2_32.lib") 6 7 int main(int argc, char* argv[]) 8 { 9 //初始化WSA 10 WORD sockVersion = MAKEWORD(2,2); 11 WSADATA wsaData; 12 if(WSAStartup(sockVersion, &wsaData)!=0) 13 { 14 return 0; 15 } 16 17 //创建套接字 18 SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 19 if(slisten == INVALID_SOCKET) 20 { 21 printf("socket error !"); 22 return 0; 23 } 24 25 //绑定IP和端口 26 sockaddr_in sin; 27 sin.sin_family = AF_INET; 28 sin.sin_port = htons(8888); 29 sin.sin_addr.S_un.S_addr = INADDR_ANY; 30 if(bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR) 31 { 32 printf("bind error !"); 33 } 34 35 //开始监听 36 if(listen(slisten, 5) == SOCKET_ERROR) 37 { 38 printf("listen error !"); 39 return 0; 40 } 41 42 //循环接收数据 43 SOCKET sClient; 44 sockaddr_in remoteAddr; 45 int nAddrlen = sizeof(remoteAddr); 46 char revData[255]; 47 while (true) 48 { 49 printf("等待连接...\n"); 50 sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen); 51 if(sClient == INVALID_SOCKET) 52 { 53 printf("accept error !"); 54 continue; 55 } 56 printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr)); 57 58 //接收数据 59 int ret = recv(sClient, revData, 255, 0); 60 if(ret > 0) 61 { 62 revData[ret] = 0x00; 63 printf(revData); 64 } 65 66 //发送数据 67 char * sendData = "你好，TCP客户端！\n"; 68 send(sClient, sendData, strlen(sendData), 0); 69 closesocket(sClient); 70 } 71 72 closesocket(slisten); 73 WSACleanup(); 74 return 0; 75 }
client端：
1 #include "stdafx.h" 2 #include <WINSOCK2.H> 3 #include <STDIO.H> 4 5 #pragma comment(lib,"ws2_32.lib") 6 7 8 int main(int argc, char* argv[]) 9 { 10 WORD sockVersion = MAKEWORD(2,2); 11 WSADATA data; 12 if(WSAStartup(sockVersion, &data) != 0) 13 { 14 return 0; 15 } 16 17 SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 18 if(sclient == INVALID_SOCKET) 19 { 20 printf("invalid socket !"); 21 return 0; 22 } 23 24 sockaddr_in serAddr; 25 serAddr.sin_family = AF_INET; 26 serAddr.sin_port = htons(8888); 27 serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); 28 if (connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR) 29 { 30 printf("connect error !"); 31 closesocket(sclient); 32 return 0; 33 } 34 char * sendData = "你好，TCP服务端，我是客户端!\n"; 35 send(sclient, sendData, strlen(sendData), 0); 36 37 char recData[255]; 38 int ret = recv(sclient, recData, 255, 0); 39 if(ret > 0) 40 { 41 recData[ret] = 0x00; 42 printf(recData); 43 } 44 closesocket(sclient); 45 WSACleanup(); 46 return 0; 47 }
二. <UDP>
SERVER 端
1 #include "stdafx.h" 2 #include <stdio.h> 3 #include <winsock2.h> 4 5 #pragma comment(lib, "ws2_32.lib") 6 7 int main(int argc, char* argv[]) 8 { 9 WSADATA wsaData; 10 WORD sockVersion = MAKEWORD(2,2); 11 if(WSAStartup(sockVersion, &wsaData) != 0) 12 { 13 return 0; 14 } 15 16 SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 17 if(serSocket == INVALID_SOCKET) 18 { 19 printf("socket error !"); 20 return 0; 21 } 22 23 sockaddr_in serAddr; 24 serAddr.sin_family = AF_INET; 25 serAddr.sin_port = htons(8888); 26 serAddr.sin_addr.S_un.S_addr = INADDR_ANY; 27 if(bind(serSocket, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR) 28 { 29 printf("bind error !"); 30 closesocket(serSocket); 31 return 0; 32 } 33 34 sockaddr_in remoteAddr; 35 int nAddrLen = sizeof(remoteAddr); 36 while (true) 37 { 38 char recvData[255]; 39 int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr *)&remoteAddr, &nAddrLen); 40 if (ret > 0) 41 { 42 recvData[ret] = 0x00; 43 printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr)); 44 printf(recvData); 45 } 46 47 char * sendData = "一个来自服务端的UDP数据包\n"; 48 sendto(serSocket, sendData, strlen(sendData), 0, (sockaddr *)&remoteAddr, nAddrLen); 49 50 } 51 closesocket(serSocket); 52 WSACleanup(); 53 return 0; 54 }
CLIENT 端
1 #include "stdafx.h" 2 #include <stdio.h> 3 #include <winsock2.h> 4 5 #pragma comment(lib, "ws2_32.lib") 6 7 int main(int argc, char* argv[]) 8 { 9 WORD socketVersion = MAKEWORD(2,2); 10 WSADATA wsaData; 11 if(WSAStartup(socketVersion, &wsaData) != 0) 12 { 13 return 0; 14 } 15 SOCKET sclient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 16 17 sockaddr_in sin; 18 sin.sin_family = AF_INET; 19 sin.sin_port = htons(8888); 20 sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); 21 int len = sizeof(sin); 22 23 char * sendData = "来自客户端的数据包.\n"; 24 sendto(sclient, sendData, strlen(sendData), 0, (sockaddr *)&sin, len); 25 26 char recvData[255]; 27 int ret = recvfrom(sclient, recvData, 255, 0, (sockaddr *)&sin, &len); 28 if(ret > 0) 29 { 30 recvData[ret] = 0x00; 31 printf(recvData); 32 } 33 34 closesocket(sclient); 35 WSACleanup(); 36 return 0; 37 }
本文来至：http://blog.csdn.net/ssun125/article/details/8525823
