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how to send big file using sockets?

Posted on 2003-11-05
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Last Modified: 2006-11-17
how can i send a big file from one pc to another using sockets in java? Also how to verify it without opening at other side whether it is transferred correctly or not?
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Question by:panemade
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by:sunnycoder
ID: 9685723
Hi panemade,

>how can i send a big file from one pc to another using sockets
divide it into smaller parts (fragmentation) and send it part by part ... at the receiving end, join all the parts to get the complete file.

>Also how to verify it without opening at other side whether it is transferred correctly or not?
look into checksums .... anyway if you are using reliable protocol such as TCP, you would have received the file correctly ... it performs the required tests

Cheers!
Sunny:o)
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by:panemade
ID: 10171515
can u give me some hint code or actual code to help to send a file using fragments?
 also how to join all fragments at receiveing end?
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sunnycoder earned 50 total points
ID: 10171555
skeleton ::

sender ::::
socket ()
connect()
fopen()
while ( fread ( ..n.. ) .. )
        send ( ..n.. )
send ( some special marker seqence indicating end of transfer )
fclose()
close()

receiver:::
socket()
bind()
listen()
accept()
fopen
whille ( not received marker sequence )
      recv()
     fwrite()
fclose()
close()
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by:panemade
ID: 10171769
thats is great hint for me. so tell me one more thing to send a data on linux is it require a ip address of that computer? is it will not work only with name of that computer to send a data as dhcp assign it ip address that is not satic on my computer network?
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Expert Comment

by:sunnycoder
ID: 10171797
use gethostbyname() to get IP address at run time
http://www.ecst.csuchico.edu/~beej/guide/net/html/syscalls.html#gethostname

you will find this tutorial very educative
http://www.ecst.csuchico.edu/~beej/guide/net/html/
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