fopen

Alpha · 10-26-2003, 02:08 PM

This is the BIGGEST part I struggle with. I don't know how to do it in ANY programming language. If someone could explain to me how I would write the phrase "This is a test" to a file and then output it to the screen I'd be VERY happy

You can do it in PHP or Python, doesn't matter.

deadserious · 10-26-2003, 11:36 PM

Actually not all languages use fopen for opening files. Here's a few examples of the various methods different languages use. Each example opens file.txt for appending, writes a string to it, reopens the file for reading and outputs the content to the browser. If you want to overwrite the content of the file rather than append to it you can switch the "a" to "w" for both PHP and Python and change the ">>" to ">" for Perl.
????: NamePros.com http://www.namepros.com/programming/15464-fopen-help.html

PHP

Code:

<?
$file = fopen ("file.txt", "a");
fwrite ($file, "This is a PHP test<br />n");
fclose ($file);

$file = fopen ("file.txt", "r");
$lines = fread ($file, filesize ("file.txt"));
fclose ($file);
echo $lines;
?>

Python

Code:

#!/usr/bin/python

print "Content-type: text/htmlrnrn"

file = open('file.txt','a')
file.write("This is a Python test<br />n")
file.close()

file = open('file.txt','r')
for lines in file.readlines():
    print lines,
file.close()

Perl

Code:

#!/usr/bin/perl

print "Content-type: text/htmlnn";

open (FILE, ">>file.txt");
print FILE "This is a Perl test<br />n";
close (FILE);

open (FILE, "file.txt");
@lines = <FILE>;
close (FILE);
print @lines;

Alpha · 10-27-2003, 05:21 PM

Thanks very much!

That will help me get it straight! BTW is it possible to create txt files with Python? So that if a txt file doesnt exist and you try to write to it it will be created?

deadserious · 10-31-2003, 09:06 AM

Yes Python will attempt to create the file if it doesn't exist when opened for appending or writing.

10-26-2003, 02:08 PM	THREAD STARTER #1 (permalink)
Alpha NamePros Regular Join Date: Jun 2003 Location: California Posts: 245	fopen This is the BIGGEST part I struggle with. I don't know how to do it in ANY programming language. If someone could explain to me how I would write the phrase "This is a test" to a file and then output it to the screen I'd be VERY happy You can do it in PHP or Python, doesn't matter. __________________ --Alpha

10-26-2003, 11:36 PM	#2 (permalink)
deadserious Senior Member Join Date: Aug 2002 Posts: 1,255	Actually not all languages use fopen for opening files. Here's a few examples of the various methods different languages use. Each example opens file.txt for appending, writes a string to it, reopens the file for reading and outputs the content to the browser. If you want to overwrite the content of the file rather than append to it you can switch the "a" to "w" for both PHP and Python and change the ">>" to ">" for Perl. ????: NamePros.com http://www.namepros.com/programming/15464-fopen-help.html PHP Code: <? $file = fopen ("file.txt", "a"); fwrite ($file, "This is a PHP test<br />n"); fclose ($file); $file = fopen ("file.txt", "r"); $lines = fread ($file, filesize ("file.txt")); fclose ($file); echo $lines; ?> Python Code: #!/usr/bin/python print "Content-type: text/htmlrnrn" file = open('file.txt','a') file.write("This is a Python test<br />n") file.close() file = open('file.txt','r') for lines in file.readlines(): print lines, file.close() Perl Code: #!/usr/bin/perl print "Content-type: text/htmlnn"; open (FILE, ">>file.txt"); print FILE "This is a Perl test<br />n"; close (FILE); open (FILE, "file.txt"); @lines = <FILE>; close (FILE); print @lines;

10-27-2003, 05:21 PM	THREAD STARTER #3 (permalink)
Alpha NamePros Regular Join Date: Jun 2003 Location: California Posts: 245	Thanks very much! That will help me get it straight! BTW is it possible to create txt files with Python? So that if a txt file doesnt exist and you try to write to it it will be created? __________________ --Alpha

10-31-2003, 09:06 AM	#4 (permalink)
deadserious Senior Member Join Date: Aug 2002 Posts: 1,255	Yes Python will attempt to create the file if it doesn't exist when opened for appending or writing.

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