socket编程源码——UDP协议

#include <stdio.h> /* Windows socket头文件 */ #include "winsock2.h" /* 网络API的动态链接库 */ #pragma comment(lib, "ws2_32.lib") void main() { /* 初始化参数 */ SOCKET uiFdsocket; WSADATA wsaData; struct sockaddr_in stServerAddr; int iAddrlen = sizeof(sockaddr_in); char szbuffer[1024] = "\0"; /* 调用Windows Sockets DLL,成功后才能使用socket系列函数 */ if (0 != WSAStartup(MAKEWORD(2,1),&wsaData)) { printf("Winsock init faied!\r\n"); WSACleanup(); return; } /* 服务器监听的端口和地址 */ memset(&stServerAddr, 0, sizeof(stServerAddr)); stServerAddr.sin_family = AF_INET; stServerAddr.sin_port = htons(6000); printf("input the server IP address!\n"); char IPadress[20]; scanf("%s", IPadress); stServerAddr.sin_addr.s_addr = inet_addr(IPadress); //printf("Please input IP address: "); //scanf("%s", IPdotdec); // 转换 //inet_pton(AF_INET, IPdotdec, &stServerAddr.sin_addr); printf("Now connecting the server...\r\n"); uiFdsocket = socket(AF_INET, SOCK_DGRAM, 0); while(true) { printf("Input message here...\r\n"); // scanf("%s", szbuffer); gets(szbuffer); if(strcmp(szbuffer, "bye") == 0) { printf("exit\r\n"); Sleep(100); closesocket(uiFdsocket); break; } if(SOCKET_ERROR != sendto(uiFdsocket, szbuffer,sizeof(szbuffer), 0, (struct sockaddr*)&stServerAddr, iAddrlen)) { Sleep(100); if (SOCKET_ERROR != recvfrom(uiFdsocket, szbuffer, sizeof(szbuffer), 0, (struct sockaddr*)&stServerAddr, &iAddrlen)) { printf("recive from server:%s\r\n", szbuffer); } } } closesocket(uiFdsocket); WSACleanup(); return; }