udp.zip_udp 文件传输

//简单文件传输程序的服务器端程序。 #include "stdio.h" #include "winsock.h" #define PORT 6543 /*定义监听端口号。*/ #pragma comment(lib,"ws2_32.lib") int main() { SOCKET sock_server; /*定义网络连接的相关的变量。*/ struct sockaddr_in addr,client_addr; int addr_len = sizeof(struct sockaddr_in); SOCKET newsock; //初始化winsock DLL WORD wVersionRequested; WSADATA wsaData; wVersionRequested=MAKEWORD(1,1); //生成版本号1.1 if(WSAStartup(wVersionRequested,&wsaData)!=0) { printf("没有找到合适的winsock.dll！\n"); return 0; } //创建套接字 if ((sock_server = socket(AF_INET,SOCK_STREAM,0))<0) /*建立一个socket。*/ { printf("创建套接字失败！\n"); return 0; } else { printf("socket created .\n"); /*socket建立成功。*/ printf("socked id: %d \n",sock_server); } //绑定IP端口 memset((void *)&addr,0,addr_len); addr.sin_family =AF_INET; addr.sin_port = htons(PORT); addr.sin_addr.s_addr = htonl(INADDR_ANY);//允许套接字使用分配给本机的任何IP if(bind(sock_server,(LPSOCKADDR)&addr,sizeof(addr))!=0) { printf("邦定失败！\n"); closesocket(sock_server); WSACleanup(); return 0; } else { printf("邦定成功！\n服务器端口:%d\n",PORT) ; } //监听端口。 if(listen(sock_server,5)!=0) { printf("listen函数调用失败！\n"); closesocket(sock_server); WSACleanup(); return 0; } else { printf("listenning......\n"); } //接收客户连接请求 if((newsock = accept(sock_server,(LPSOCKADDR)&client_addr,&addr_len))==INVALID_SOCKET) { printf("accept函数调用失败！\n"); closesocket(sock_server); WSACleanup(); return 0; } printf("cnnect from %s\n",inet_ntoa(client_addr.sin_addr)); /*输出k客户机地址。*/ //定义文件传输所需变量 char filename[256]="c:\\aaa.TXT";//要传输的文件的文件名 FILE *fp; char OrderBuffer[50], fileBuffer[1000]; int size; if((fp=fopen(filename,"rb"))==NULL)//以二进制读方式打开要传输的文件 { printf("Cannot open %s\n",filename); strcpy(filename,"<Nofile>"); //打开不成功时发送给客户端的信息 send(newsock,filename,sizeof(filename),0); //给客户端发送打开文件不成功信息 closesocket(newsock); /*关闭socket。*/ closesocket(sock_server); WSACleanup(); return 0; } else send(newsock,filename,sizeof(filename),0); //文件打开成功则给对方发送文件名 if(recv(newsock,OrderBuffer,sizeof(OrderBuffer),0)<=0) //接收对方发送来的文件接收准备好信息。 { printf("接受命令失败\n"); closesocket(newsock); closesocket(sock_server); WSACleanup(); return 0; } //如果对方准备好接收则发送文件 if(strcmp(OrderBuffer,"OK")==0) { while(!feof(fp)) { size=fread(fileBuffer,1,sizeof(fileBuffer),fp); send(newsock,fileBuffer,size,0); } printf("file transfer finished");//显示传输完成 fclose(fp);//关闭文件 } //传输完成 closesocket(newsock); closesocket(sock_server); WSACleanup(); return 0; }