05-03-2012
Quote:
Originally Posted by
Errigour
Yea but i want to receive from mush clients. I haven't planned on making a client for the program so I was hoping you could tell me how to receive only 12 bytes and ignore the rest.
For the third time, it doesn't work that way, period. If you only want 12 bytes, only read 12 bytes, but you have to throw away the junk after somehow. How would it possibly know which bytes were "good" and "bad"? If they're sending more than twelve bytes when only 12 were expected, wouldn't the bytes after it be garbage by definition?
Are you
sure it's not an entire line, which you could wait for the newline on?
Last edited by Corona688; 05-03-2012 at 07:52 PM..
10 More Discussions You Might Find Interesting
1. IP Networking
Requirements:
A server program should read a file and send the message to the client . if the file is not there, then switch to the receive part of the same program and receive any messages from the socket. If no messages to receive then switch to send part of the program to... (2 Replies)
Discussion started by: Rajeshsu
2 Replies
2. Programming
I ran degugger in C++ and the followings are the message I got:
Program received signal SIGABRT, Aborted.
0x002a57a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
(gdb) info s
#0 0x002a57a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1 0x002e97f5 in raise () from /lib/tls/libc.so.6... (1 Reply)
Discussion started by: napapanbkk
1 Replies
3. Programming
Dear all,
I used debugger from C++ and these are the message I got:
Program received signal SIGSEGV, Segmentation fault.
0x00323fc0 in free () from /lib/tls/libc.so.6
(gdb) info s
#0 0x00323fc0 in free () from /lib/tls/libc.so.6
#1 0x00794fa1 in operator delete () from... (5 Replies)
Discussion started by: napapanbkk
5 Replies
4. Shell Programming and Scripting
Hi,
I would like to write a program to receive the GPS data and then send the data via network to other program.
All of the program is not write yet(include host and sender)
All of the server OS is unix or linux
Could you mind to give me some idea to do this?
Thanks so much!
Ken
... (2 Replies)
Discussion started by: kenlok
2 Replies
5. AIX
Hello,
One of our customer is getting segmentation fault when he runs his shell script which invokes our executable on AIX 6.1.
On AIX 5.3, there were no issues.
Here is the truss output.
811242: __loadx(0x0A040000, 0xF0D3A26C, 0x00000000, 0x00000009, 0x00000000) = 0xF026E884... (0 Replies)
Discussion started by: erra_krishna
0 Replies
6. AIX
Hi to all,
i am trying to make mksysb backup of a NIM client machine from NIM master and while i am reading that the backup is done successfully i get an error message below and it doesnt exit the smit screen. also the status of the command appears to be running.
is there anybody who knows why... (3 Replies)
Discussion started by: omonoiatis9
3 Replies
7. Programming
I am making a command line program in C using XCode. When running the program, it initially does what it is supposed to do (asks me for a file path). However, when I type in a valid and existing file path, it gives me the following error:
Program received signal: “EXC_BAD_ACCESS”.... (6 Replies)
Discussion started by: mdonova33
6 Replies
8. Programming
in a single main() function,so need signal handling. Use Posix Message Queue IPC mechanism , can ignore the priority and other linked list message,to implement the scenario:
client:Knock Knock
server:who's there
client: Eric
Server:Eric,Welcome.
client:exit
all process terminated
... (1 Reply)
Discussion started by: ouou
1 Replies
9. Solaris
hi all
I am getting following error while taking backup
using the command
ufsdump 0ubf 512 /dev/rmt/0cbn /database/backup2/rman_backup/level0 >> /database/backup2/backup_tape/level0_rman_06sep12 2>&1;
from the log i got the error
bash# tail -f level0_rman_06sep12
DUMP: Date of... (3 Replies)
Discussion started by: nikhil kasar
3 Replies
10. Programming
I am trying to learn C and while trying out some code, the program is getting aborted while I am calling free().
Here is the code:
#include <stdlib.h>
#include <stdio.h>
void print_by_ptr(char **str) {
printf("<%s>\n",*str);
printf("Now I am modifying the str.\n");
*str =... (3 Replies)
Discussion started by: chacko193
3 Replies
bytes(3perl) Perl Programmers Reference Guide bytes(3perl)
NAME
bytes - Perl pragma to force byte semantics rather than character semantics
NOTICE
This pragma reflects early attempts to incorporate Unicode into perl and has since been superseded. It breaks encapsulation (i.e. it
exposes the innards of how the perl executable currently happens to store a string), and use of this module for anything other than
debugging purposes is strongly discouraged. If you feel that the functions here within might be useful for your application, this possibly
indicates a mismatch between your mental model of Perl Unicode and the current reality. In that case, you may wish to read some of the perl
Unicode documentation: perluniintro, perlunitut, perlunifaq and perlunicode.
SYNOPSIS
use bytes;
... chr(...); # or bytes::chr
... index(...); # or bytes::index
... length(...); # or bytes::length
... ord(...); # or bytes::ord
... rindex(...); # or bytes::rindex
... substr(...); # or bytes::substr
no bytes;
DESCRIPTION
The "use bytes" pragma disables character semantics for the rest of the lexical scope in which it appears. "no bytes" can be used to
reverse the effect of "use bytes" within the current lexical scope.
Perl normally assumes character semantics in the presence of character data (i.e. data that has come from a source that has been marked as
being of a particular character encoding). When "use bytes" is in effect, the encoding is temporarily ignored, and each string is treated
as a series of bytes.
As an example, when Perl sees "$x = chr(400)", it encodes the character in UTF-8 and stores it in $x. Then it is marked as character data,
so, for instance, "length $x" returns 1. However, in the scope of the "bytes" pragma, $x is treated as a series of bytes - the bytes that
make up the UTF8 encoding - and "length $x" returns 2:
$x = chr(400);
print "Length is ", length $x, "
"; # "Length is 1"
printf "Contents are %vd
", $x; # "Contents are 400"
{
use bytes; # or "require bytes; bytes::length()"
print "Length is ", length $x, "
"; # "Length is 2"
printf "Contents are %vd
", $x; # "Contents are 198.144"
}
chr(), ord(), substr(), index() and rindex() behave similarly.
For more on the implications and differences between character semantics and byte semantics, see perluniintro and perlunicode.
LIMITATIONS
bytes::substr() does not work as an lvalue().
SEE ALSO
perluniintro, perlunicode, utf8
perl v5.14.2 2010-12-30 bytes(3perl)