Windows下C语言的Socket编程例子(TCP和UDP)
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2022-06-07 14:59:12
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刚刚学windows编程,所以想写学习笔记,这是一个简单的Socket程序例子,开发环境是vc6:
首先是TCP
server端:
#include "stdafx.h" #include <stdio.h> #include <winsock2.h> #pragma comment(lib,"ws2_32.lib") int main(int argc, char* argv[]) { //初始化WSA WORD sockVersion = MAKEWORD(2,2); WSADATA wsaData; if(WSAStartup(sockVersion, &wsaData)!=0) { return 0; } //创建套接字 SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(slisten == INVALID_SOCKET) { printf("socket error !"); return 0; } //绑定IP和端口 sockaddr_in sin; sin.sin_family = AF_INET; sin.sin_port = htons(8888); sin.sin_addr.S_un.S_addr = INADDR_ANY; if(bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR) { printf("bind error !"); } //开始监听 if(listen(slisten, 5) == SOCKET_ERROR) { printf("listen error !"); return 0; } //循环接收数据 SOCKET sClient; sockaddr_in remoteAddr; int nAddrlen = sizeof(remoteAddr); char revData[255]; while (true) { printf("等待连接...\n"); sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen); if(sClient == INVALID_SOCKET) { printf("accept error !"); continue; } printf("接受到一个连接:%s \r\n", inet_ntoa(remoteAddr.sin_addr)); //接收数据 int ret = recv(sClient, revData, 255, 0); if(ret > 0) { revData[ret] = 0x00; printf(revData); } //发送数据 char * sendData = "你好,TCP客户端!\n"; send(sClient, sendData, strlen(sendData), 0); closesocket(sClient); } closesocket(slisten); WSACleanup(); return 0; }
client端:
#include "stdafx.h" #include <WINSOCK2.H> #include <STDIO.H> #pragma comment(lib,"ws2_32.lib") int main(int argc, char* argv[]) { WORD sockVersion = MAKEWORD(2,2); WSADATA data; if(WSAStartup(sockVersion, &data) != 0) { return 0; } SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(sclient == INVALID_SOCKET) { printf("invalid socket !"); return 0; } sockaddr_in serAddr; serAddr.sin_family = AF_INET; serAddr.sin_port = htons(8888); serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); if (connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR) { printf("connect error !"); closesocket(sclient); return 0; } char * sendData = "你好,TCP服务端,我是客户端!\n"; send(sclient, sendData, strlen(sendData), 0); char recData[255]; int ret = recv(sclient, recData, 255, 0); if(ret > 0) { recData[ret] = 0x00; printf(recData); } closesocket(sclient); WSACleanup(); return 0; }
然后是UDP
server端:
#include "stdafx.h" #include <stdio.h> #include <winsock2.h> #pragma comment(lib, "ws2_32.lib") int main(int argc, char* argv[]) { WSADATA wsaData; WORD sockVersion = MAKEWORD(2,2); if(WSAStartup(sockVersion, &wsaData) != 0) { return 0; } SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if(serSocket == INVALID_SOCKET) { printf("socket error !"); return 0; } sockaddr_in serAddr; serAddr.sin_family = AF_INET; serAddr.sin_port = htons(8888); serAddr.sin_addr.S_un.S_addr = INADDR_ANY; if(bind(serSocket, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR) { printf("bind error !"); closesocket(serSocket); return 0; } sockaddr_in remoteAddr; int nAddrLen = sizeof(remoteAddr); while (true) { char recvData[255]; int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr *)&remoteAddr, &nAddrLen); if (ret > 0) { recvData[ret] = 0x00; printf("接受到一个连接:%s \r\n", inet_ntoa(remoteAddr.sin_addr)); printf(recvData); } char * sendData = "一个来自服务端的UDP数据包\n"; sendto(serSocket, sendData, strlen(sendData), 0, (sockaddr *)&remoteAddr, nAddrLen); } closesocket(serSocket); WSACleanup(); return 0; }client端:
#include "stdafx.h" #include <stdio.h> #include <winsock2.h> #pragma comment(lib, "ws2_32.lib") int main(int argc, char* argv[]) { WORD socketVersion = MAKEWORD(2,2); WSADATA wsaData; if(WSAStartup(socketVersion, &wsaData) != 0) { return 0; } SOCKET sclient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); sockaddr_in sin; sin.sin_family = AF_INET; sin.sin_port = htons(8888); sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); int len = sizeof(sin); char * sendData = "来自客户端的数据包.\n"; sendto(sclient, sendData, strlen(sendData), 0, (sockaddr *)&sin, len); char recvData[255]; int ret = recvfrom(sclient, recvData, 255, 0, (sockaddr *)&sin, &len); if(ret > 0) { recvData[ret] = 0x00; printf(recvData); } closesocket(sclient); WSACleanup(); return 0; }