Windows下C 用 Socket 发送图片--基础

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服务器端

[cpp] view plain copy print?#include <stdio.h>  #include <winsock2.h>  #include <winsock2.h>  #define SERVER_PORT 9210 //侦听端口  #pragma comment(lib,"ws2_32.lib")  struct Data //数据包  {      int length;      char receivemessage[2000]; //内容信息      int fin;  }data;  int main()  {      FILE * fp;      if (!(fp = fopen("abc.jpg", "wb+")))      {          printf("open abc.jpg error");          exit(0);      }      WORD wVersionRequested;//双字节；高字节存取副版本号，低字节存取高版本号。      WSADATA wsaData;//存取套接字实现的具体信息      int ret,  length;      SOCKET sListen, sServer; //侦听套接字，连接套接字      struct sockaddr_in saServer, saClient; //地址信息        //WinSock初始化      wVersionRequested = MAKEWORD(2, 2);       ret = WSAStartup(wVersionRequested, &wsaData);       if (ret != 0)      {          printf("WSAStartup() failed!\n");          return 0;      }      //创建Socket,使用TCP协议      sListen = socket(AF_INET, SOCK_STREAM, 0);      if (sListen == INVALID_SOCKET)      {          WSACleanup();          printf("socket() faild!\n");          return 0;      }      //构建本地地址信息      saServer.sin_family = AF_INET; //地址家族      saServer.sin_port = htons(SERVER_PORT); //注意转化为网络字节序      saServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY); //使用INADDR_ANY 指示任意地址                                                          //绑定      ret = bind(sListen, (struct sockaddr *)&saServer, sizeof(saServer));      if (ret == SOCKET_ERROR)      {          printf("bind() faild! code:%d\n", WSAGetLastError());          closesocket(sListen); //关闭套接字          WSACleanup();          return 0;      }      //侦听连接请求      ret = listen(sListen, 5);      if (ret == SOCKET_ERROR)      {          printf("listen() faild! code:%d\n", WSAGetLastError());          closesocket(sListen); //关闭套接字          return 0;      }      printf("Waiting for client connecting!\n");      printf("Tips: Ctrl+c to quit!\n");      length = sizeof(saClient);      sServer = accept(sListen, (struct sockaddr *)&saClient, &length);      if (sServer == INVALID_SOCKET)      {          printf("accept() faild! code:%d\n", WSAGetLastError());          closesocket(sListen); //关闭套接字          WSACleanup();          return 0;      }      //阻塞等待接受客户端连接      while (!data.fin)      {          memset(data.receivemessage, '0', sizeof(data.receivemessage));          ret = recv(sServer, (char *)&data, sizeof(struct Data), 0);  //第二个参数使用强制类型，为一个数据包          if (ret == SOCKET_ERROR)          {              printf("recv() failed!\n");              return 0;          }          if (ret == 0) //客户端已经关闭连接          {              printf("Client has closed the connection\n");              break;          }          fwrite(data.receivemessage, data.length, 1, fp);      }        closesocket(sListen);        closesocket(sServer);        WSACleanup();      return 0;  }

客户端

[cpp] view plain copy print?#define _WINSOCK_DEPRECATED_NO_WARNINGS  #include <stdio.h>  #include <stdlib.h>  #include <winsock2.h>  #define SERVER_PORT 9210 //侦听端口  #pragma comment(lib,"ws2_32.lib")  struct Data  {      int length;      char sendMessage[2000];      int fin;  }data;  int main()  {      FILE * fp;      errno_t err = fopen_s(&fp, "D:\\7.jpg", "rb+");      WORD wVersionRequested;      WSADATA wsaData;      int ret;      SOCKET sClient; //连接套接字      struct sockaddr_in saServer; //地址信息      BOOL fSuccess = TRUE;      fseek(fp, 0, SEEK_END);      int end = ftell(fp);      fseek(fp, 0, 0);      //WinSock初始化      wVersionRequested = MAKEWORD(2, 2); //希望使用的WinSock DLL的版本      ret = WSAStartup(wVersionRequested, &wsaData);      if (ret != 0)      {          printf("WSAStartup() failed!\n");          return 0;      }      //确认WinSock DLL支持版本2.2      if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2)      {          WSACleanup();          printf("Invalid WinSock version!\n");          return 0;      }      //创建Socket,使用TCP协议      sClient = socket(AF_INET, SOCK_STREAM, 0);      if (sClient == INVALID_SOCKET)      {          WSACleanup();          printf("socket() failed!\n");          return 0;      }      //构建服务器地址信息      saServer.sin_family = AF_INET; //地址家族      saServer.sin_port = htons(SERVER_PORT); //注意转化为网络节序      saServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");      //连接服务器      ret = connect(sClient, (struct sockaddr *)&saServer, sizeof(saServer));      if (ret == SOCKET_ERROR)      {          printf("connect() failed!\n");          closesocket(sClient); //关闭套接字          WSACleanup();          return 0;      }      int nZero = 10;      setsockopt(sClient, SOL_SOCKET, SO_SNDBUF, (char *)&nZero, sizeof(nZero));      while (end > 0)      {          memset(data.sendMessage, '0', sizeof(data.sendMessage));          fread(data.sendMessage, 1024, 1, fp);          if (end >= 1024) //剩余很多信息          {              data.fin = 0;              data.length = 1024;          }          else          {              data.fin = 1;              data.length = end;          }          ret = send(sClient, (char *)&data, sizeof(struct Data), 0);          if (ret == SOCKET_ERROR)          {              printf("send() failed!\n");          }          else          {              end -= 1024;          }      }      closesocket(sClient); //关闭套接字      WSACleanup();      return 0;  }

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