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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WSAWORD 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;
}

TCP send

#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;
}

UDP SERV

#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;
}

UDP SEND

#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;
}