socket图片文件传输示例

1、从前在网上找过很多S。c k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j P g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 <winsock.h>#include <stdio.h>#define BUFLEN sizeof(buf)int main()WSADATA wsaData;SOCKADDR_IN seraddr,cliaddr

2、;SOCKET listensocket,newconnection,tempsocket;ULONG sockmode;int 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 ) !

3、= 0 )printf("error1");return -1;if(listensocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP)=INVAL ID_SOCKET)printf("error2");return -1;seraddr.sin_family=AF_INET;seraddr.sin_port=htons(8889);if(SOCKET_ERROR=bind(listensocket,(SOCKADDR*)&seraddr,sizeof(se raddr)printf("error3

4、");return -1;if(SOCKET_ERROR=listen(listensocket,5)printf("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) /

5、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。p=(char *)&k;while(1)FD_ZERO(&fdread);FD_ZERO(&fdwrite);FD_SET(listensocket,&fdread);for(int i=0;i<totalsock;i+)FD_SET(tempsocket,&fdread

6、);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)sockok-;if(INVALID_SOCKET=(newconnection=accept(listensocket,(SOCKADDR*)&cliaddr,&cliaddrlen)printf(&quo

7、t;error5");return -1;elseprintf("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,sizeof(buf0);if(FD_ISSET(newconnection,&fdread)memset(bu

8、f,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(buf,"exit")=0)/ /printf

9、("conplete copy");/break;/ if(m=send(newconnection,buf,n,0)/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

10、针移动到文件开头while(!feof(fp) / 文件未结束memset(buf,0,BUFLEN); / 清除缓存中的内容读取文件内容到缓存n=fread(buf,1,BUFLEN,fp); /if(m<0)printf("error on send main");m=GetLastError();return -1;if(he+=m)>=k)printf("copy complete");把文件内容发送给/send(clientSock,buf,n,0); /客户方fclose(fp);break;/if(strcmp(buf0,&qu

11、ot;exit")=0)/ break;WSACleanup( );gets(buf);printf("exit to exit");if(strcmp("exit",buf)return 0;客户端：#pragma comment (lib,"ws2_32.lib")#include <winsock.h>#include <stdio.h>#include<iostream.h>int main()WSADATA wsaData;SOCKADDR_IN cliaddr;SOCKET s

12、con;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a p 1的参数，然后用1 nt型运算int sockok;struct fd_set fdwrite,fdread;int cliaddrlen=sizeof(cliaddr);ULONG sockmode=1;FILE *fp;if ( WSAStartup( MAKEWORD(2,0), &wsaData ) != 0 )/ 初始化套接字空间printf("error1");return

13、 -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/* if(SOCKET_ERROR=bind(scon,(SOCKADDR*)&cliaddr,cliaddrlen)/显示绑定套接字与地址信息printf("error3");return -1;*/pr

14、intf("connect.n");if(SOCKET_ERROR=connect(scon,(SOCKADDR*)&cliaddr,cliaddrlen)/ 连接远端主机printf("error4 connect failed");return -1;printf("donen");if(SOCKET_ERROR=ioctlsocket(scon,FIONBIO,&sockmode)/ 修改套接字为非阻塞printf("error on ioctl");return -1;if(!(fp=fop

15、en("input.jpg","wb+")/打开已有或创建一个二进制文件printf("error on fopen");for(int i=0;i+)/死循环FD_ZERO(&fdwrite);FD_ZERO(&fdread);FD_SET(scon,&fdwrite);FD_SET(scon,&fdread);if(sockok=select(0,&fdread,&fdwrite,NULL,NULL)<0)/选 择出可读写的套接字用形参接收printf("error

16、on select");return -1;if(m=-2) break;/完成传送文件标志位m = = 2/memset(buf,0,sizeof(buf);memset(buf0,0,sizeof(buf0);/ 清缓存/gets(buf);/if(strcmp("exit",buf)=0)/ printf("exit.");/ return 0;/*if(send(scon,buf,strlen(buf),0)=SOCKET_ERROR)continue;elseprintf(buf0);printf("n");*/g

17、ets(p);/n=(long)*p;while(FD_ISSET(scon,&fdread)&&(sockok-)&&(m!=-2)/判断是否有可读套接字if(l=0)/文件长度接收标志1 = = 1为接收了if(q=recv(scon,a.a,sizeof(a),0)<0)/接收文件长度printf("error on recv long");return -1;l=1;if(l=2)/ 文件长度接收并返回确认信息了memset(buf0,0,sizeof(buf0);while(n=recv(scon,buf0,sizeo

18、f(buf0),0)>0)/接 收 主文件/continue;m= fwrite(buf0,n,1,fp);memset(buf0,0,sizeof(buf0);if(m=1)&&(a.b-=n)<=0)/ 文件写入本地且文件接收长度达到文件长度结束cout<<a.b<<endl;cout<<n<<endl;cout<<m<<endl;send(scon,"exit",strlen("exit"),0);printf("complete copy");m=-2;/printf(&qu