socket编程（TCPUDP）

本文主要是介绍socket编程（TCPUDP），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

一.Windows环境下，VC中实现。

1. TCP

（1）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;  }  

（2）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;  }  

2. UDP

（1）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;  }  

（2）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;  }  

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