服务端：
#include
#include
#pragmacomment(lib,"ws2_32.lib")//加载ws2_32.dll
#defineBUF_SIZE1024
intmain(intargc,char*argv[]){
//先检查文件是否存在
char*filename="Beyond.mp3";//文件名
FILE*fp=fopen(filename,"rb");//以二进制方式打开文件
if(fp==NULL)
{
printf("Cannotopenfile,pressanykeytoexit!\n");
system("pause");
exit(0);
}
//初始化DLL
WSADATAwsaData;
WSAStartup(MAKEWORD(2,2),&wsaData);
//创建套接字
SOCKETservSock=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
if(servSock==INVALID_SOCKET)
{
printf("Failedsocket().\n");
WSACleanup();
return0;
}
//绑定套接字
structsockaddr_insockAddr;
memset(&sockAddr,0,sizeof(sockAddr));//每个字节都用0填充
sockAddr.sin_family=PF_INET;//使用IPv4地址
sockAddr.sin_addr.s_addr=inet_addr("127.0.0.1");//具体的IP地址
sockAddr.sin_port=htons(1234);//端口
if(bind(servSock,(SOCKADDR*)&sockAddr,sizeof(SOCKADDR))==SOCKET_ERROR)
{
printf("Failedbind().\n");
WSACleanup();
return0;
}
//进入监听状态
listen(servSock,20);
//循环接收客户端请求
intnSize=sizeof(SOCKADDR);
charbuffer[BUF_SIZE]={0};//缓冲区
SOCKADDRclntAddr;
SOCKETclntSock;
for(;;)
{
clntSock=accept(servSock,(SOCKADDR*)&clntAddr,&nSize);
if(clntSock==INVALID_SOCKET)
{
printf("Failedaccept().\n");
continue;
}
intnCount;
while(nCount=fread(buffer,1,BUF_SIZE,fp)>0)
{
send(clntSock,buffer,nCount,0);//循环发送数据，直到文件结尾
}
shutdown(clntSock,SD_SEND);//文件读取完毕，断开输出流，向客户端发送FIN包
recv(clntSock,buffer,BUF_SIZE,0);//阻塞，等待客户端接收完毕
memset(buffer,0,BUF_SIZE);//设置缓冲区
fclose(fp);
closesocket(clntSock);
}
//关闭套接字
closesocket(servSock);
//终止DLL的使用
WSACleanup();
system("pause");
return0;
}
客户端：
#include
#include
#include
#pragmacomment(lib,"ws2_32.lib")
#defineBUF_SIZE1024
intmain(intargc,char*agrv[])
{
//先输入文件名，看文件是否能创建成功
charfilename[100]={0};//文件名
printf("Inputfilenametosave:");
gets(filename);
FILE*fp=fopen(filename,"wb");//以二进制方式打开(创建)文件
if(fp==NULL)
{
printf("Cannotopenfile,pressanykeytoexit!\n");
system("pause");
exit(0);
}
//初始化DLL
WSADATAwsaData;
WSAStartup(MAKEWORD(2,2),&wsaData);
//创建套接字
SOCKETsock=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
if(sock==INVALID_SOCKET)
{
printf("Failedsocket().\n");
WSACleanup();
return0;
}
//向服务器发起请求
structsockaddr_insockAddr;
memset(&sockAddr,0,sizeof(sockAddr));//每个字节都用0填充
sockAddr.sin_family=PF_INET;
sockAddr.sin_addr.s_addr=inet_addr("127.0.0.1");
sockAddr.sin_port=htons(1234);
if(connect(sock,(SOCKADDR*)&sockAddr,sizeof(SOCKADDR))==-1)
{
printf("Failedconnect().\n");
WSACleanup();
return0;
}
//循环接受数据，知道文件传输完毕
charbuffer[BUF_SIZE]={0};//文件缓冲区
intnCount;
while((nCount=recv(sock,buffer,BUF_SIZE,0))>0)
{
fwrite(buffer,nCount,1,fp);
}
puts("Filetransfersuccess!\n");
memset(buffer,0,BUF_SIZE);//重置缓冲区
fclose(fp);
closesocket(sock);
//终止使用DLL
WSACleanup();
system("pause");
return0;
}
