generare file zip "al volo"

[eloderma]

ho creato uno script che genere dei files zip tramite la classe pclzip, contenenti foto che poi il cliente può scaricare, la questione è che una volte che il cliente ha finito di scaricare il file questo mi rimane sul server.

è possibile in qualche maniera ovviare al problema, cioè fare creare il file all'atto dello scaricamento o cose del genere.

qualcuno ha una idea?

[mariox]

io uso la classe createzipfile:

<?php

/**
 * Class to dynamically create a zip file (archive)
 *
 * @author Rochak Chauhan
 */

class createZip  {  

    public $compressedData = array(); 
    public $centralDirectory = array(); // central directory   
    public $endOfCentralDirectory = "\x50\x4b\x05\x06\x00\x00\x00\x00"; //end of Central directory record
    public $oldOffset = 0;

    /**
     * Function to create the directory where the file(s) will be unzipped
     *
     * @param $directoryName string 
     *
     */
    
    public function addDirectory($directoryName) {
        $directoryName = str_replace("\\", "/", $directoryName);  

        $feedArrayRow = "\x50\x4b\x03\x04";
        $feedArrayRow .= "\x0a\x00";    
        $feedArrayRow .= "\x00\x00";    
        $feedArrayRow .= "\x00\x00";    
        $feedArrayRow .= "\x00\x00\x00\x00"; 

        $feedArrayRow .= pack("V",0); 
        $feedArrayRow .= pack("V",0); 
        $feedArrayRow .= pack("V",0); 
        $feedArrayRow .= pack("v", strlen($directoryName) ); 
        $feedArrayRow .= pack("v", 0 ); 
        $feedArrayRow .= $directoryName;  

        $feedArrayRow .= pack("V",0); 
        $feedArrayRow .= pack("V",0); 
        $feedArrayRow .= pack("V",0); 

        $this -> compressedData[] = $feedArrayRow;
        
        $newOffset = strlen(implode("", $this->compressedData));

        $addCentralRecord = "\x50\x4b\x01\x02";
        $addCentralRecord .="\x00\x00";    
        $addCentralRecord .="\x0a\x00";    
        $addCentralRecord .="\x00\x00";    
        $addCentralRecord .="\x00\x00";    
        $addCentralRecord .="\x00\x00\x00\x00"; 
        $addCentralRecord .= pack("V",0); 
        $addCentralRecord .= pack("V",0); 
        $addCentralRecord .= pack("V",0); 
        $addCentralRecord .= pack("v", strlen($directoryName) ); 
        $addCentralRecord .= pack("v", 0 ); 
        $addCentralRecord .= pack("v", 0 ); 
        $addCentralRecord .= pack("v", 0 ); 
        $addCentralRecord .= pack("v", 0 ); 
        $ext = "\x00\x00\x10\x00";
        $ext = "\xff\xff\xff\xff";  
        $addCentralRecord .= pack("V", 16 ); 

        $addCentralRecord .= pack("V", $this -> oldOffset ); 
        $this -> oldOffset = $newOffset;

        $addCentralRecord .= $directoryName;  

        $this -> centralDirectory[] = $addCentralRecord;  
    }     
    
    /**
     * Function to add file(s) to the specified directory in the archive 
     *
     * @param $directoryName string 
     *
     */
    
    public function addFile($data, $directoryName)   {
 
        $directoryName = str_replace("\\", "/", $directoryName);  
    
        $feedArrayRow = "\x50\x4b\x03\x04";
        $feedArrayRow .= "\x14\x00";    
        $feedArrayRow .= "\x00\x00";    
        $feedArrayRow .= "\x08\x00";    
        $feedArrayRow .= "\x00\x00\x00\x00"; 

        $uncompressedLength = strlen($data);  
        $compression = crc32($data);  
        $gzCompressedData = gzcompress($data);  
        $gzCompressedData = substr( substr($gzCompressedData, 0, strlen($gzCompressedData) - 4), 2); 
        $compressedLength = strlen($gzCompressedData);  
        $feedArrayRow .= pack("V",$compression); 
        $feedArrayRow .= pack("V",$compressedLength); 
        $feedArrayRow .= pack("V",$uncompressedLength); 
        $feedArrayRow .= pack("v", strlen($directoryName) ); 
        $feedArrayRow .= pack("v", 0 ); 
        $feedArrayRow .= $directoryName;  

        $feedArrayRow .= $gzCompressedData;  

        $feedArrayRow .= pack("V",$compression); 
        $feedArrayRow .= pack("V",$compressedLength); 
        $feedArrayRow .= pack("V",$uncompressedLength); 

        $this -> compressedData[] = $feedArrayRow;

        $newOffset = strlen(implode("", $this->compressedData));

        $addCentralRecord = "\x50\x4b\x01\x02";
        $addCentralRecord .="\x00\x00";    
        $addCentralRecord .="\x14\x00";    
        $addCentralRecord .="\x00\x00";    
        $addCentralRecord .="\x08\x00";    
        $addCentralRecord .="\x00\x00\x00\x00"; 
        $addCentralRecord .= pack("V",$compression); 
        $addCentralRecord .= pack("V",$compressedLength); 
        $addCentralRecord .= pack("V",$uncompressedLength); 
        $addCentralRecord .= pack("v", strlen($directoryName) ); 
        $addCentralRecord .= pack("v", 0 );
        $addCentralRecord .= pack("v", 0 );
        $addCentralRecord .= pack("v", 0 );
        $addCentralRecord .= pack("v", 0 );
        $addCentralRecord .= pack("V", 32 ); 

        $addCentralRecord .= pack("V", $this -> oldOffset ); 
        $this -> oldOffset = $newOffset;

        $addCentralRecord .= $directoryName;  

        $this -> centralDirectory[] = $addCentralRecord;  
    }

    /**
     * Fucntion to return the zip file
     *
     * @return zipfile (archive)
     */

    public function getZippedfile() { 

        $data = implode("", $this -> compressedData);  
        $controlDirectory = implode("", $this -> centralDirectory);  

        return   
            $data.  
            $controlDirectory.  
            $this -> endOfCentralDirectory.  
            pack("v", sizeof($this -> centralDirectory)).     
            pack("v", sizeof($this -> centralDirectory)).     
            pack("V", strlen($controlDirectory)).             
            pack("V", strlen($data)).                
            "\x00\x00";                             
    }

    /**
     *
     * Function to force the download of the archive as soon as it is created
     *
     * @param archiveName string - name of the created archive file
     */

    public function forceDownload($archiveName) {
        $headerInfo = '';
         
        if(ini_get('zlib.output_compression')) {
            ini_set('zlib.output_compression', 'Off');
        }

        // Security checks
        if( $archiveName == "" ) {
            echo "<html><title>Public Photo Directory - Download </title><body>
[B]ERROR:[/B] The download file was NOT SPECIFIED.</body></html>";
            exit;
        } 
        elseif ( ! file_exists( $archiveName ) ) {
            echo "<html><title>Public Photo Directory - Download </title><body>
[B]ERROR:[/B] File not found.</body></html>";
            exit;
        }

        header("Pragma: public");
        header("Expires: 0");
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header("Cache-Control: private",false);
        header("Content-Type: application/zip");
        header("Content-Disposition: attachment; filename=".basename($archiveName).";" );
        header("Content-Transfer-Encoding: binary");
        header("Content-Length: ".filesize($archiveName));
        readfile("$archiveName");
        
     }

}

poi istanzio la classe:

<?php

include_once("createZip.inc.php");
$createZip = new createZip;  

$createZip -> addDirectory("dir/");

$fileContents = file_get_contents("img.jpg");  
$createZip -> addFile($fileContents, "dir/img.jpg");  


$fileName = "archive.zip";
$fd = fopen ($fileName, "wb");
$out = fwrite ($fd, $createZip -> getZippedfile());
fclose ($fd);

$createZip -> forceDownload($fileName);//forza il download del file
@unlink($fileName);//elimino il file

[pippuzzo80]

sinceramente non ho mai utilizzato questa classe, però penso una cosa, potresti far andare il cliente ad una determinata pagina... quella pagina crea al volo lo zip (allo stesso modo come lo hai creato in precedenza) e permette al cliente di scaricarlo, poi potresti OBBLIGARE il cliente a cliccare un tasto (una sorta di logout). In questo modo sapresti quando l'utente ha terminato lo scaricamento e, usando il comando unlink, potresti cancellare il file...





edit: mariox mi ha preceduto, dandoti una soluzione migliore!!

[eloderma]

Originariamente inviato da mariox
io uso la classe createzipfile:

<?php

/**
 * Class to dynamically create a zip file (archive)
 *
 * @author Rochak Chauhan
 */

class createZip  {  

    public $compressedData = array(); 
    public $centralDirectory = array(); // central directory   
    public $endOfCentralDirectory = "\x50\x4b\x05\x06\x00\x00\x00\x00"; //end of Central directory record
    public $oldOffset = 0;

    /**
     * Function to create the directory where the file(s) will be unzipped
     *
     * @param $directoryName string 
     *
     */
    
    public function addDirectory($directoryName) {

ma quindi aspetta lo scaricamento del file e poi lo cancella? non è che appena parte il download lo cancella?

[mariox]

aspetta lo scaricamento del file e poi lo cancella.

[alpeweb]

puoi anche vedere gli ob

[eloderma]

grazie mille

[eloderma]

potreste riincollare la classe che così come hai messo manca qualche parentesi...

[eloderma]

l'ho scaricata da phpclasses ma ho sempre sto errore

Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in c:\programmi\easyphp1-8\www\anteprima_zip\createzip.inc.php on line 11