I have created a file using open() and written data to it. Data appears as normal characters in the file. How to save these characters in a binary format in that file using C language? Here I mean that the characters should be actually stored as 0 and 1. Do I have to convert the whole data using some function or there is some standard way to do it in Linux?
View 14 RepliesI wanna learn how to store data in text file and be able to modify it and save as well using C++.
Note: im using Turbo C++ 3.0
I've got a rather large CSV file (~700MB) which I know to consist of lines of 27-character alpha-numeric hashes; no commas or anything fancy. Somehow, during its migration from Windows to Linux (via winSCP and then a few regular SCPs), it has converted into some kind of binary format I am unfamiliar with.If I open the file in vi, everything appears fine, and it says [converted] at the bottom, although I know it's not a line endings issue (and dos2unix doesn't help). If I 'head' the file, it looks proper except for a " at the beginning of the first line. If I open up the file in nano, however, I see the at the start and then "^@" before every character (even newlines and EoF).
If I try to re-save or copy the file (say via: head file.csv > short.txt), this special encoding is preserved. I copied the first ten lines out of vi (which displays it properly) into my Windows clipboard via my SSH client, then pasted it into a new text file, test.txt. This file is visually identical when opened in vi (and similar through 'head', minus the ), although it's roughly half of the filesize. I have no idea what format this once-text file got converted to (it's notoriously hard to search the internet for symbols), but surely there must be some way to convert it back.
I am coding a http server which has to send the file(s) such as images, .avi files, .mpeg, that the client is going to request. I have been trying of sending files through sockets.
char info [256];
bzero(info, 256);
//memset(&info,0,sizeof(info));
read(socket, info, 255);
write(socket, HTTP, 255);
FILE *fl= fopen(info,"rb");
fseek(fl, 0, SEEK_END);
long len = ftell(fl);
printf("largo: %ld", len);
unsigned char *ret = (char*) malloc(len);
fseek(fl, 0, SEEK_SET);
fread(ret, 1, len, fl);
However, it's supposed to be shown in Mozilla Firefox (as the client). But it is not doing it, so.. It's just not getting the complete file.
I am using centos 5, want to send a sets of binary data to other bluetooth device I know how to sent a file but dont know how to sent raw data. My case is like this I have a bluetooth device I need to send data to then after it process I need to get it back, I plan to do this all using terminal is that possible?
View 2 Replies View RelatedI am trying to store the results of my code to a separate text file.But the problem is, as my results comes from a loop, my text file shows only the last result, not all of them.Like if the loop runs 5 time the text file shows the result for the 5th step.But i need to store all of them (1 to 5).Can I use awk to print the output field and store to another file and creat a new line so that the next output field goes to a new line?(just an idea, dont know).
#!/bin/basth
for (( i=1; i<=5; i++))
do
./file.exe > output.txt
done
I am using C. I have a fuction that returns a string
Code:
I need to format this string so that I can create a text file like so:
So I'm trying:
Code:
But I get errors like:
I want to change data format in a file using bash. The orignal is like:
Code:
1 abc 6 pqr
2 def 7 stu
3 ghij 8 vwx
4 kl 9 yz
[Code]....
Is there any Linux utility to combine two or more binary files into a single binary file ?
View 7 Replies View RelatedHow to coded version info and other information likes author and company name into the ELF binary?
I prefer the put the version info during build step.
Our application uses a dynamically loaded shared object library (codec library) to compress and decompress audio streams.
There happens to be several static and global variables in this shared object library. Hence it is not possible to process two interleaved unrelated media streams using this shared object codec library because each stream corrupts/changes the contents of these static/global variables.
Is there a way through which a context save (save contents of data segment of shared object) and a context load (load previously saved contents of data segment of shared object)operation can be performed on the shared object library. This way the context for each media stream can be saved and loaded before and after processing the "other" media stream respectively.
All I want to do is fade some text in and out via the opacity attribute, and change the text when it hits zero. My script changes the text on time, but ignores the formatting effects. I'm not worried at this stage about the else statement in the startFadeEffect() function. I just want the fade effect to work here the way it should.
[Code]...
Options:A double linked list with fixed size character arrays. New nodes will be added when previous ones get filled. Dynamic arrays using realloc(). Linked list has the disadvantage of not having an O(1) search like an array but I think using realloc() will be more dangerous since it moves the whole block to a new location and if the new location is not big enough to hold the whole block, realloc fails !! this case will not occur with the linked list since its nodes are scattered.
View 14 Replies View RelatedI am writting a program that reads a text file (music.txt) & stores it in a Data Structure. I am a novice learning over the internet so I this is something I have never done. How do I do this?
Quote:
Write a program that reads the data from the music.txt file and store it in a data structure. To implement this data structure you must use an array of songs and each song must be represented by a struct with appropriate fields. So far all I can do is open to file to read it (very simple I know) but so far is it correct?
Code:
#include <iostream>
#include <fstream>
#include <strstream>
[code]....
trying read serial COM port and want to write that received data to file, now its writing only one sentence, but i want to write full file which coming on serial port, as i'm sending file from hyper terminal and reading on linux pc, If i put while loop its not writing anything,without while loop its writing only one line and if send big file then application terminates and then writes to file.But i need do write any size which coming on serial port.Finally i want write full file which is coming on hyper terminal, after writing the file it has wait for next data. This is my code,
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
[code]...
I need a loop that pulls out the user name into a variable and then pulls out the LastUpdate field into another variable so I can then perform a comparison against the last update field. Requirements are AIX tools including AWK, SED and Perl I am writing a script to check AIX users password expiration dates and if they are within the alerting period (ie. 7 days etc) it will email the user. I will release the full script into the public domain once completed. The text file I want to parse is formatted like:
Code:
colettel:
password = XSON0m4SdIQDw
lastupdate = 1260829398
andrewwa:
[code].....
How to create binary file with text in it, something like
Quote:
Hola Mundo!
I want it binary, because I want to execute it directly from Bios before Windows.
I've already used line split stuff to transform my data into something like this in a text file:
Code:
['1', '1', '3', '20.7505207']
['2', '1', '3', '23.0488319']
['3', '1', '3', '-1.5768747']
['4', '1', '3', '-26.4772491']
[code]....
How can I get this on a python program so I can manipulate it as an array?
is there command in linux which is able to convert binary (0101001010000100) to text like it means something
View 4 Replies View RelatedI'm trying to customize Knoppix to automatically run a text only binary upon bootup. Does anyone know how I might do that? I suppose I need to copy the binary into the file system and change the boot loader to point to the binary and perhaps some other stuff.
View 1 Replies View RelatedI manually rotated my catalina.out file, and now the file jumps to 30+Mb and when I try to view it, less tells me it might be a binary file. It sure appears to have binary data in it, about 30meg of it.
I did the rotate via a copy:
copy catalina.out to another file
cat /dev/null > catalina.out
I have tried using echo:
echo "" > catalina.out
...also with the same result.
This application isn't something I can just bounce when necessary. It kind of appears that the original file is still there - sort of. But is it not readable text anymore.
SunOS 5.10
tomcat 5.5.26 (version required by app vendor)
Is there such an application that can handle opening a 30GB binary file containing hex data? GHex won't open it.
View 11 Replies View RelatedI am trying to redirect connection to port 8980 to execute a telnet command to a local machine
by issuing the following command :
In Server 1 :
socat TCP-LISTEN:8980,fork EXEC:/myscript,reuseaddr
My script contains
#!/bin/bash
telnet 192.168.20.12 //local Server 2
I am sending Binary data from the client to Server 2 via Server 1. So it happens that I have some characters in Hex translated to special characters in ASCII like open brackets or Commas etc.. and that closed the socket between the two machines.
I'm using LibreOffice 3.3.2 to open a document I received through work. The document is from MS Word in .doc format and has some track changes. I started using Libre Office to track my changes to the document but the only format I can save it in and retain my changes is .odt which is fine for me. However I would like to return this in .doc format.
It seems odd that LibreOffice happily opens a document with track changes but cannot save them back in that format.
Am I doing something wrong? I am using Edit>Changes>Record and then File>Save As.
i would like to add 8 bytes of data to the begigning of a binary file.is there a command for this?
View 2 Replies View RelatedHow do I save a document I created in OpenOffice.org in .doc format? I want to use the same file in a windows OS. Whenever i select the "Windows XP" option then click save OpenOffice crashes. How do I fix this?
View 7 Replies View RelatedI try to name a file in the editor with this and nothing happens...(creating a conky_start.sh file under home directory and add it to start up)$cd && touch conky_start.sh && chmod +x conky_start.sh && gedit conky_start.shAnd add these lines to that file and save it :
#!/bin/bash
sleep 30 &&
exec conky -d -c ~/.conkyrc &
[code]....
Fedora12/Kde4After a Sane Scan how do I Save a scan as a *.txt file ? gocr does not work, I can save in any other format but a txt file.
View 6 Replies View RelatedI've looked at tutorials but can't find out how to save a cron job in nano text editor.
I open crontab with
Quote:
crontab -e
The cron job I want to save is
Quote:
wget --output-document=dwr_$(date +\%Y\%m\%d\%H\%M).gif http://imd.gov.in/section/dwr/img/caz_chn.gif
So now I've got this in nano text editor
Quote:
# m h dom mon dow command
wget --output-document=dwr_$(date +\%Y\%m\%d\%H\%M).gif http://imd.gov.in/section/dwr/img/caz_chn.gif
What exactly do I do now to save the cron job? File doesn't have a Save As option,;just Open Terminal, Open Tab and New Profile.
I would like to know how can I save the Internet speed shown from the bmon program to a txt file.
View 6 Replies View Related