【转】Windows下C语言的Socket编程例子（TCP和UDP）

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
 #include

 #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
 #include

 #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
 #include

 #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
 #include

 #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;
 }

原文网址 http://blog.csdn.net/oinux/article/details/8525823

本来是想做MFC下的socket学习的，但是由于实在太繁琐，而且容易出错，如果通过调用上面的函数会使程序易懂，于是转回来自己看