Sponsored Content
Top Forums UNIX for Advanced & Expert Users Conversion from ASCII to binary for physical simulation code in C/C++ Post 302507826 by Corona688 on Friday 25th of March 2011 07:45:30 PM
Old 03-25-2011
Quote:
Originally Posted by Cybertib
But now, the following point is the last: how to select my datas using awk with binary datas ?
I don't think you can. You could write a C utility to do that:
Code:
int main(void)
{
        int columns=6;
        float *f=malloc(sizeof(float)*columns);
        float comp=0.0f;

        // Read binary data piped into stdin
        while(fread(f, sizeof(float), columns, stdin) == columns)
        {
                // Never compare floating point with == unless you know
                // you're really going to get the exact value right
                // down to the last bit.  Choose a value sufficiently close
                // to equal instead.
                if(abs(f[0]-comp) < 0.000001)
                        // If the row matches, write it back to standard out.
                        fwrite(f, sizeof(float), columns, stdout);
        }
}

For that matter, cutting awk out entirely could let you do everything with full, 64-bit double-precision variables.

---------- Post updated 03-25-11 at 05:45 PM ---------- Previous update was 03-24-11 at 10:07 PM ----------

I just realized something here:
Code:
double buffer[]={x, y, Z(i,j)}; 
fwrite(buffer, sizeof(double), sizeof(buffer), Mesh);

I think you're writing too much data. sizeof(buffer) doesn't give you the number of elements, it gives you the size in bytes! That should be
Code:
fwrite(buffer, sizeof(double), sizeof(buffer)/sizeof(double), Mesh);

Or just "3".
This User Gave Thanks to Corona688 For This Post:
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Convert ASCII to BINARY

Here is what I did . . . . I FTP'd several *.pdf files from a web site to a UNIX server, and did not set the transfer mode to BIN, now Adobe thinks that the documents are corrupted. Is there a way to convert the *.pdf files to Binary so that Adobe can open them again. I would just re-download... (2 Replies)
Discussion started by: pc9456
2 Replies

2. Shell Programming and Scripting

ascii conversion

after converting my ebcidic file to ascii i get the following output 2097152+0 records in 1797345+1 records out Why is there a difference in number of records. Is the converson chopping off any records. All i am doing is just a conversion using the following script dd if=xaa cbs=152 ... (0 Replies)
Discussion started by: rintingtong
0 Replies

3. SCO

ascii to binary conversion in sco 5.0.5

Here is what I did . . . . I FTP'd several *.dbf zipped files from a SCO 5.0.5 server to winXP machine, and did not set the transfer mode to BIN, now when i was uncompressing these files in SCO 5.0.5 , it was giving "Bad Decode Table error. Is there a way to convert the *.dbf.Z files to Binary so... (1 Reply)
Discussion started by: sameek1211
1 Replies

4. Shell Programming and Scripting

binary to ascii

Hi, Is there a way to convert the binary file to ascii . the binary file is pipe delimited. from source the file(pipe delimited) is ftped to mainframe and from mainframe it is ftped to the unix box using binary format. Is there a way to change it back to ascii and view it? Thanks! (3 Replies)
Discussion started by: dnat
3 Replies

5. UNIX for Dummies Questions & Answers

Ascii or Binary?

Hello all, I am working with ftp servers in unix, and always I have to get and put files but I don't know exactly if I have to get or put them as an ascii or binary. Some files that I use are: .txt, .sav, .fmb, .pct, .sh, .ksh, .dat, .log. Somebody can tell me what is the difference between... (2 Replies)
Discussion started by: Geller
2 Replies

6. Shell Programming and Scripting

binary to ascii conversion

Hi, I have got a library file, created by compiling C code. The file information with "file" command, gives it a "application/x-archive" type file. I want to extract the release string of my software from this file, so that i can know which version of C files were used to create the lib. Can... (3 Replies)
Discussion started by: atulmt
3 Replies

7. Solaris

EBCDIC to ASCII Binary conversion issue on Solaris i-series Unix

Hi All, I am facing EBCDIC to ASCII Binary conversion on Solaris i-series Unix system. However this is working fine on Solaris Sparc Unix system. Input file having EBCDIC format does not work on Solaris i-series Unix system. Could you please tell me, what will be the root cause for same? (14 Replies)
Discussion started by: amodkavi
14 Replies

8. Shell Programming and Scripting

Bash - binary data to ascii code

Hello, With bash-script (ubunto server) I'm trying to read a binary file and, for each character, give back its ascii code (including extended ascii). For example: HEX => ASCII => PRINT f5 => 245 => õ 50 => 80 => P To load the binary file into a variable I tried in this way: ... (2 Replies)
Discussion started by: math4
2 Replies

9. Solaris

ASN Binary to ASCII

Dears, I need help to convert the binary file into ASCII format. Actually we have CDRs which is generated by telecom switch at this is in ASN1 format or binary format, I need to convert those binary formatted file into ASCII format using Perl, or shell scripting. Is there any way to solve... (3 Replies)
Discussion started by: PRINCESS_RORO
3 Replies

10. Shell Programming and Scripting

File conversion from Binary to ASCII though UNIX command

Hi All , I have a mainframe file which contains the data in EBCDIC format.I have downloaded this file from mainframe to windows in binary format(unreadable raw data).Now I want convert this file to ASCII format(readable format data) through Unix command.I have tried iconv but that is not working... (2 Replies)
Discussion started by: STCET22
2 Replies
OD(1)								   User Commands							     OD(1)

NAME
od - dump files in octal and other formats SYNOPSIS
od [OPTION]... [FILE]... od [-abcdfilosx]... [FILE] [[+]OFFSET[.][b]] od --traditional [OPTION]... [FILE] [[+]OFFSET[.][b] [+][LABEL][.][b]] DESCRIPTION
Write an unambiguous representation, octal bytes by default, of FILE to standard output. With more than one FILE argument, concatenate them in the listed order to form the input. With no FILE, or when FILE is -, read standard input. If first and second call formats both apply, the second format is assumed if the last operand begins with + or (if there are 2 operands) a digit. An OFFSET operand means -j OFFSET. LABEL is the pseudo-address at first byte printed, incremented when dump is progressing. For OFFSET and LABEL, a 0x or 0X prefix indicates hexadecimal; suffixes may be . for octal and b for multiply by 512. Mandatory arguments to long options are mandatory for short options too. -A, --address-radix=RADIX output format for file offsets; RADIX is one of [doxn], for Decimal, Octal, Hex or None --endian={big|little} swap input bytes according the specified order -j, --skip-bytes=BYTES skip BYTES input bytes first -N, --read-bytes=BYTES limit dump to BYTES input bytes -S BYTES, --strings[=BYTES] output strings of at least BYTES graphic chars; 3 is implied when BYTES is not specified -t, --format=TYPE select output format or formats -v, --output-duplicates do not use * to mark line suppression -w[BYTES], --width[=BYTES] output BYTES bytes per output line; 32 is implied when BYTES is not specified --traditional accept arguments in third form above --help display this help and exit --version output version information and exit Traditional format specifications may be intermixed; they accumulate: -a same as -t a, select named characters, ignoring high-order bit -b same as -t o1, select octal bytes -c same as -t c, select printable characters or backslash escapes -d same as -t u2, select unsigned decimal 2-byte units -f same as -t fF, select floats -i same as -t dI, select decimal ints -l same as -t dL, select decimal longs -o same as -t o2, select octal 2-byte units -s same as -t d2, select decimal 2-byte units -x same as -t x2, select hexadecimal 2-byte units TYPE is made up of one or more of these specifications: a named character, ignoring high-order bit c printable character or backslash escape d[SIZE] signed decimal, SIZE bytes per integer f[SIZE] floating point, SIZE bytes per float o[SIZE] octal, SIZE bytes per integer u[SIZE] unsigned decimal, SIZE bytes per integer x[SIZE] hexadecimal, SIZE bytes per integer SIZE is a number. For TYPE in [doux], SIZE may also be C for sizeof(char), S for sizeof(short), I for sizeof(int) or L for sizeof(long). If TYPE is f, SIZE may also be F for sizeof(float), D for sizeof(double) or L for sizeof(long double). Adding a z suffix to any type displays printable characters at the end of each output line. BYTES is hex with 0x or 0X prefix, and may have a multiplier suffix: b 512 KB 1000 K 1024 MB 1000*1000 M 1024*1024 and so on for G, T, P, E, Z, Y. EXAMPLES
od -A x -t x1z -v Display hexdump format output od -A o -t oS -w16 The default output format used by od AUTHOR
Written by Jim Meyering. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report od translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/od> or available locally via: info '(coreutils) od invocation' GNU coreutils 8.28 January 2018 OD(1)
All times are GMT -4. The time now is 11:14 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy