how to extract texts from PDFs using xpdf?

问题

I have many PDFs in a folder. I want to extract the text from these PDFs using xpdf. For example :

example1.pdf extract to example1.txt
example2.pdf extract to example2.txt
etc..

here is my code :

<?php

$path = 'C:/AppServ/www/pdfs/';
$dir = opendir($path);
$f = readdir($dir);

while ($f = readdir($dir)) {
    if (eregi("\.pdf",$f)){
        $content = shell_exec('C:/AppServ/www/pdfs/pdftotext '.$f.' ');
        $read = strtok ($f,".");
        $testfile = "$read.txt";
        $file = fopen($testfile,"r");
        if (filesize($testfile)==0){} 
        else{
           $text = fread($file,filesize($testfile));
        fclose($file);
        echo "</br>"; echo "</br>";
        }
    }
}

I get blank result. What's wrong with my code?

回答1:

try using this :

$dir      = opendir($path);
$filename = array();

while ($filename = readdir($dir)) {
if (eregi("\.pdf",$filename)){
    $content  = shell_exec('C:/AppServ/www/pdfs/pdftotext '.$filename.' ');
    $read     = strtok ($filename,".");
    $testfile = "$read.txt";
    $file     = fopen($testfile,"r");
    if (filesize($testfile)==0){} 
    else{
        $text = fread($file,filesize($testfile));
        fclose($file);
        echo "</br>"; echo "</br>";
    }
}

回答2:

You do not have to create a temporary txt file

$command = '/AppServ/www/pdfs/pdftotext ' . $filename . ' -';
$a = exec($command, $text, $retval);
echo $text;

if it does not work check the error logs of the server.

回答3:

The lines

echo "</br>";
echo "</br>";

should be

echo "</br>";
echo $text."</br>";

Hope this helps

来源：https://stackoverflow.com/questions/9286036/how-to-extract-texts-from-pdfs-using-xpdf

标签

php

xpdf