利用UDP協議傳送與接收檔案

一、傳送端

//初始化winsocket庫

word ver;

wsadata wsadata;

ver=makeword(1,1);

if(wsastartup(ver,&wsadata))

if ( lobyte( wsadata.wversion ) != 1 ||

hibyte( wsadata.wversion ) != 1 )

//與本地ip繫結

socket sock=socket(af_inet,sock_dgram,0);

sockaddr_in addrs;

addrs.sin_addr.s_addr=htonl(inaddr_any);

addrs.sin_family=af_inet;

addrs.sin_port=htons(8899);

bind(sock,(sockaddr*)&addrs,sizeof(sockaddr));

//接收端的ip位址

sockaddr_in addrr;

addrr.sin_addr.s_addr=inet_addr("192.168.1.6");

addrr.sin_family=af_inet;

addrr.sin_port=htons(9988);

int len=sizeof(sockaddr);

//開啟要傳送檔案

bool 

bsuccess ;

handle  hfile ;

dword 

dwfilesize, dwhighsize , dwbytesread;

hfile = createfile ("f:\\111.bmp", generic_read, file_share_read, null,

open_existing, file_flag_sequential_scan, null) ;

if (hfile == invalid_handle_value)

dwfilesize = getfilesize (hfile, &dwhighsize);//獲得檔案的大小

if (dwhighsize)

//傳送檔案大小

char strfilesize[20];

itoa(dwfilesize,strfilesize,10 );

sendto(sock,strfilesize,20,0, (sockaddr*)&addrr,len);

//讀檔案內容到readfile中

byte *readfile;

readfile=(byte*)malloc(dwfilesize);

bsuccess = readfile (hfile, readfile, dwfilesize, &dwbytesread, null) ;

closehandle (hfile) ;

if (!bsuccess || (dwbytesread != dwfilesize)) 

//eachsend表示每次傳送字元的大小

dword eachsend=50*1024,retval,n,yu,i,j;

byte  eachbuf[50*1024];

n=dwfilesize / eachsend;  //共需要幾次全額傳送

yu=dwfilesize % eachsend; //最後剩下的字元大小

//先傳送n次全額資料

for(i=0;i

retval=sendto(sock,(char*)eachbuf,eachsend,0, (sockaddr*)&addrr,len);

if(retval!=eachsend)

memset(eachbuf,0,50*1024);

}//再傳送剩下的字元

for(i=0;i

retval=sendto(sock,(char*)eachbuf,yu,0, (sockaddr*)&addrr,len);

if(retval!=yu)

//中斷winsocket庫

closesocket(sock);

wsacleanup(); 

二、接收端

//初始化winsocket庫

word ver;

wsadata wsadata;

ver=makeword(1,1);

if(wsastartup(ver,&wsadata))

if ( lobyte( wsadata.wversion ) != 1 ||

hibyte( wsadata.wversion ) != 1 )

//與本地ip繫結

socket sock=socket(af_inet,sock_dgram,0);

sockaddr_in addrr;

addrr.sin_addr.s_addr=htonl(inaddr_any);

addrr.sin_family=af_inet;

addrr.sin_port=htons(9988);

if(socket_error==bind(sock,(sockaddr*)&addrr,sizeof(sockaddr)))

//獲取要接收檔案的大小

sockaddr_in addrs;

int len=sizeof(sockaddr);

char strfilesize[20];

recvfrom(sock,strfilesize,20,0,(sockaddr*)&addrs,&len);

dword 

dwfilesize;

dwfilesize=atoi(strfilesize); //檔案大小

dword eachrecv=50*1024,n,yu,i,j,retval;

n=dwfilesize / eachrecv;

yu=dwfilesize % eachrecv;

char  eachbuf[50*1024];

byte *recvbuf=(byte*)malloc(dwfilesize);//初始化要存放資料的字串

for(i=0;i

for(j=0;j

memset(eachbuf,0,50*1024);

} retval=recvfrom(sock,eachbuf,yu,0, (sockaddr*)&addrr,&len);

if(retval!=yu)

for(i=0;i

//寫入檔案

file *fp;

fp=fopen("f:\\222.bmp","wb");

fwrite(recvbuf,dwfilesize,1,fp);

fclose(fp); 

//中斷winsocket庫

closesocket(sock);

wsacleanup(); 

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