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1、从前在网上找过很多编程的资料，都很高深。对于入门级的我来说，简单又不简陋的小例子更好一些，所以总结一下刚写的小例子，用select模型实现的文件传输，并不完善，只作为今后的一个参考。代码经过调试，应该能用吧。服务器端：#pragma comment (lib,ws2_32.lib)#include #include #define BUFLEN sizeof(buf)int main()WSADATA wsaData;SOCKADDR_IN seraddr,cliaddr;SOCKET listensocket,newconnection,tempsocket;ULONG sockmode;i
2、nt sockok,totalsock=0;struct fd_set fdwrite,fdread;char buf10,buf010;union char a4;int b;a,flag;a.b=flag.b=0;int cliaddrlen=sizeof(cliaddr);FILE *fp;long code;int n,he=0,m=0,k=0,b=0;char *p;if ( WSAStartup( MAKEWORD(2,0), &wsaData ) != 0 )printf(error1);return -1;if(listensocket=socket(AF_INET,SOCK_
3、STREAM,IPPROTO_TCP)=INVALID_SOCKET)printf(error2);return -1;seraddr.sin_family=AF_INET;seraddr.sin_port=htons(8889);seraddr.sin_addr.s_addr=inet_addr(127.0.0.1);if(SOCKET_ERROR=bind(listensocket,(SOCKADDR*)&seraddr,sizeof(seraddr)printf(error3);return -1;if(SOCKET_ERROR=listen(listensocket,5)printf(
4、error4);return -1;printf(wait ask);sockmode=1;if(SOCKET_ERROR=ioctlsocket(listensocket,FIONBIO,&sockmode)printf(error on ioctl);return -1;if(fp=fopen(output.jpg,rb)=NULL) /指定的文件是否存在 /指定文件不存在 printf(不能打开指定的文件!n); fseek(fp,0,SEEK_END); /读写指针移动到文件结尾k=a.b=ftell(fp); code=htonl(m); /返回当前读写指针的位置，即得到文件长度。
5、p=(char *)&k;while(1)FD_ZERO(&fdread);FD_ZERO(&fdwrite);FD_SET(listensocket,&fdread);for(int i=0;itotalsock;i+)FD_SET(tempsocket,&fdread);FD_SET(tempsocket,&fdwrite);if(SOCKET_ERROR=(sockok=select(NULL,&fdread,&fdwrite,NULL,NULL)printf(error on select);return -1;if(FD_ISSET(listensocket,&fdread)sock
6、ok-;if(INVALID_SOCKET=(newconnection=accept(listensocket,(SOCKADDR*)&cliaddr,&cliaddrlen)printf(error5);return -1;else printf(come);totalsock+;tempsocket=newconnection;if(SOCKET_ERROR=ioctlsocket(newconnection,FIONBIO,&sockmode)printf(error on ioctl);return -1;memset(buf,0,sizeof(buf);/memset(buf0,0
7、,sizeof(buf0);if(FD_ISSET(newconnection,&fdread)memset(buf,0,sizeof(buf);if(flag.b=2) if(recv(newconnection,flag.a,sizeof(flag),0)0) printf(error on recv long); return -1; /if(a.b=0) a.b=2;/else /if(recv(newconnection,buf,sizeof(buf),0)=SOCKET_ERROR)/printf(error on recv ack);/return -1;/if(strcmp(b
8、uf,exit)=0)/printf(conplete copy);/break;/if(FD_ISSET(newconnection,&fdwrite)/gets(buf0);sockok-; if(a.b&flag.b=0) if(b=send(newconnection,a.a,sizeof(a),0)0) printf(error on send); return -1; /memset(a.a,0,sizeof(a);flag.b=2; if(flag.b=1)/ 打开文件，并把文件内容发送到客户方，然后关闭文件和套接字 rewind(fp); /文件读写指针移动到文件开头 whil
9、e(!feof(fp) /文件未结束 memset(buf,0,BUFLEN); /清除缓存中的内容 n=fread(buf,1,BUFLEN,fp); /读取文件内容到缓存 if(m=send(newconnection,buf,n,0) if(m=k)printf(copy complete); /send(clientSock,buf,n,0); /把文件内容发送给客户方 fclose(fp);break;/if(strcmp(buf0,exit)=0)/break;WSACleanup( );gets(buf);printf(exit to exit);if(strcmp(exit,b
10、uf)return 0;客户端：#pragma comment (lib,ws2_32.lib)#include #include #includeint main()WSADATA wsaData;SOCKADDR_IN cliaddr;SOCKET scon;char buf050;int n=0,m=0;int j=0,k=0,l=0,q=0;unionchar a4;int b;a;/存储文件长度，用字符型指针做接收发送的参数，然后用型运算int sockok;struct fd_set fdwrite,fdread;int cliaddrlen=sizeof(cliaddr);ULO
11、NG sockmode=1;FILE *fp;if ( WSAStartup( MAKEWORD(2,0), &wsaData ) != 0 )/初始化套接字空间printf(error1);return -1;if(scon=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP)=INVALID_SOCKET)/创建套接字printf(error2);return -1;cliaddr.sin_family=AF_INET; /初始化为ipv4族cliaddr.sin_port=htons(8889); /端口号cliaddr.sin_addr.s_addr=inet_addr(127.0.0.1); /地址/*if(SOCKET_ERROR=bind(scon,(SOCKADDR*)&cliaddr,cliaddrlen)/显示绑定套接字与地址信息printf(error3);return -1;*/
