Why the simple Socket Snippet doesn't work?

meili100 · 05-03-2008, 04:45 PM

Sender side:

Code:

int len = strlen(str);
write(sock,&len,sizeof(int));
write(sock,str,len);

Receiver Side:

Code:

int len;
read(sock,&len,sizeof(int));
char* str=(char*)malloc(len*sizeof(char));
read(sock,str,len);

vart · 05-03-2008, 11:28 PM

what are return values of write and read?
what does it mean - "doesn't work" - how do you check it?

PS. And this is C, why to post on C++ board?

abachler · 05-05-2008, 04:57 AM

maybe because write() and read() aren't part of the socket API !?

also, what OS? I don't see any of the initialization or setup functions in that snippet. without some more context information it could be anything, a bad pointer, a bad socket, unitialized socket stack, improperly installed drivers, poor feng shui, etc.

05-03-2008, 04:45 PM	#1
meili100 Registered User Join Date: Apr 2007 Posts: 282	Why the simple Socket Snippet doesn't work? Sender side: Code: int len = strlen(str); write(sock,&len,sizeof(int)); write(sock,str,len); Receiver Side: Code: int len; read(sock,&len,sizeof(int)); char* str=(char)malloc(lensizeof(char)); read(sock,str,len);
meili100 is offline

05-03-2008, 11:28 PM	#2
vart CSharpener Join Date: Oct 2006 Posts: 5,326	what are return values of write and read? what does it mean - "doesn't work" - how do you check it? PS. And this is C, why to post on C++ board? __________________ If I have eight hours for cutting wood, I spend six sharpening my axe.
vart is offline

05-05-2008, 04:57 AM	#3
abachler Malum in se Join Date: Apr 2007 Posts: 3,188	maybe because write() and read() aren't part of the socket API !? also, what OS? I don't see any of the initialization or setup functions in that snippet. without some more context information it could be anything, a bad pointer, a bad socket, unitialized socket stack, improperly installed drivers, poor feng shui, etc. __________________ Until you can build a working general purpose reprogrammable computer out of basic components from radio shack, you are not fit to call yourself a programmer in my presence. This is cwhizard, signing off.
abachler is offline

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Simple program won't work on a friend's comp	Ouendanation	C++ Programming	6	01-25-2008 08:03 PM
How come this simple 10-line code can work ?! (very interesting)	meili100	C++ Programming	7	11-15-2007 01:36 AM
Novice Beginner: Simple hello world wont work	hern	C++ Programming	8	06-25-2005 12:16 PM
The Bludstayne Open Works License	frenchfry164	A Brief History of Cprogramming.com	8	11-26-2003 11:05 AM
when to close a socket	Wisefool	Networking/Device Communication	5	11-02-2003 10:33 AM