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Full Discussion: Conversion from ASCII to binary for physical simulation code in C/C++
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:
Cybertib
 

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LEARN ABOUT BSD

fwrite

FREAD(3S)																 FREAD(3S)

NAME

       fread, fwrite - buffered binary input/output

SYNOPSIS

       #include <stdio.h>

       fread(ptr, sizeof(*ptr), nitems, stream)
       FILE *stream;

       fwrite(ptr, sizeof(*ptr), nitems, stream)
       FILE *stream;

DESCRIPTION

       Fread reads, into a block beginning at ptr, nitems of data of the type of *ptr from the named input stream.  It returns the number of items
       actually read.

       If stream is stdin and the standard output is line buffered, then any partial output line will be flushed before any  call  to  read(2)	to
       satisfy the fread.

       Fwrite  appends	at  most  nitems  of data of the type of *ptr beginning at ptr to the named output stream.  It returns the number of items
       actually written.

SEE ALSO

       read(2), write(2), fopen(3S), getc(3S), putc(3S), gets(3S), puts(3S), printf(3S), scanf(3S)

DIAGNOSTICS

       Fread and fwrite return 0 upon end of file or error.

4th Berkeley Distribution					   May 15, 1985 							 FREAD(3S)
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