How to convert ascii data file to binary data file using perl script : Perl

May 9, 2008 07:31pm pdt

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01.18.2008 at 02:33AM PST, ID: 23092930

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8.4

How to convert ascii data file to binary data file using perl script

Zone: Perl Programming Language

Tags: Perl

I'm on a fc3 box with perl v5.8.5. I'm a newbie for Perl programming. I'd like to convert an ascii data file to binary data file using a Perl script. The data are Integer format and separated by one or more whitespaces, I need to convert it to float format then write to binary data file.

ascii data file just like follwing

1 2 3 4 5
6 7 8 9 1 0
.....................................

Could anyone can tell me where is the issue of my script and how to do it?

Best Regards

Jerry

         
           
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             #!/usr/bin/perl 
 
die "\nUsage: $0 ascfile binfile\n\n" if $#ARGV < 1;
 
($infilename, $outfilename) = @ARGV;
 
open(INF, "<$infilename")  or die "\nCan't open $infilename for reading: $!\n";
 
open(OUTF, ">$outfilename") or die "\nCan't open $outfilename for writing: $!\n";
 
binmode(OUTF);
 
my @data=<INF>;
 
foreach my $line (@data) {
 
  @fields=split(/ /,$line);
 
  foreach my $Val (@fields) {
 
    printf("%f\n", pack("d", $Val));
    printf(OUTF "%f", pack("d", $Val));
 
  }
 
}
 
close(OUTF) or die "Can't close $destfile: $!\n";
close(INF)  or die "Can't close $srcfile: $!\n";

           
         

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Question Stats

Zone: Programming

Question Asked By: Jerryleo

Solution Provided By: ozo

Participating Experts: 2

Solution Grade: A

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01.18.2008 at 03:41AM PST, ID: 20689359

Rank: Genius

ozo:

I'm not sure what you are trying to do
Did you want something like
printf("%f\n", $Val);
print OUTF pack("d", $Val);

01.18.2008 at 03:47AM PST, ID: 20689380

Rank: Genius

ozo:

and you may have meant split(' ',$line) or split(/s+/,$line) or split/ +/,$line

01.18.2008 at 03:48AM PST, ID: 20689383

Rank: Genius

ozo:

and you may have meant split(' ',$line) or split(/\s+/,$line) or split/ +/,$line

01.18.2008 at 06:45AM PST, ID: 20690566

Jerryleo:

Thanks for reply.

I'm sorry for my unclear express.

What I want to do is

1. Read data from an ASCII file. Data is separated by one or more whitespaces

2. Convert data from integer to float

3. Output to binary data file.

The issue is

1. My script doesn't work for the data separated by multi witespace

2. The file command reports the output file is still ASCII file, just the data format changed to float, for exampel,

the input file
1 2 3 4 5
the output file
1.0000000 2.000000 ....

01.18.2008 at 08:02AM PST, ID: 20691341

Rank: Genius

Adam314:

On most systems, there is no 'real' difference between an ascii file and a binary file. Typically, a binary file will just use characters above 127, while an ascii file will not.

How do you want the binary file formatted?

01.18.2008 at 01:27PM PST, ID: 20694345

Rank: Genius

ozo:

Is this what you wantred to do?
#!/usr/bin/perl

die "\nUsage: $0 ascfile binfile\n\n" if $#ARGV < 1;

($infilename, $outfilename) = @ARGV;

open(INF, "<$infilename") or die "\nCan't open $infilename for reading: $!\n";

open(OUTF, ">$outfilename") or die "\nCan't open $outfilename for writing: $!\n";

binmode(OUTF);

my @data=<INF>;

foreach my $line (@data) {

@fields=split(' ',$line);

foreach my $Val (@fields) {

printf("%f\n", $Val);
print(OUTF pack("d", $Val));

}

}

close(OUTF) or die "Can't close $destfile: $!\n";
close(INF) or die "Can't close $srcfile: $!\n";

01.18.2008 at 06:51PM PST, ID: 20695858

Jerryleo:

to Adam314

>How do you want the binary file formatted?
just use characters above 127

01.18.2008 at 07:02PM PST, ID: 20695908

Jerryleo:

to ozo

It works.

One more question, how to read the data one by one, not by line. Because the data dont't have a fixed length, just separated by one or more whitespaces, sysread / read need to be specified the length. Is there a function or something like the C function fscanf(FILEHANDLE, FORMAT, VARS)?

Thanks !

01.18.2008 at 07:09PM PST, ID: 20695925

Rank: Genius

ozo:

I would probably write:
while( <INF> ){
for( split ){
printf"%f\n", $_;
print OUTF pack"d", $_;
}
}

Accepted Solution

01.18.2008 at 07:28PM PST, ID: 20695965

Jerryleo:

to ozo

Could you tell me what's the advantage of you code compares with mine, shorter and faster than mine?

Thanks again!

20080236-EE-VQP-29 / EE_QW_2_20070628