error in downloading files in php

[abhay bharadwaj]

i've written the code to download the files from database, there it includes videos(3gp,mp4,flv etc.)and pdf's.But the problem is..when i click download it downloads the file in txt format(including videos),i need the exact format when it is downloaded..so please help me with this..

[abhay bharadwaj]

here the code to download files.

<?php
$fileId = $_GET["fileId"];
$sql = "SELECT buk_file_type, buk_file_name, buk_file_size, buk_file_bytes FROM books WHERE buk_file_id = $fileId";
$dsn = 'mysql:dbname=lr;host=localhost;';
$user = 'root';
$password = '';
 
 
try{
 
$stmt = $dbh->prepare($sql) or die(implode(':', $stmt->errorInfo()));
$stmt->bindParam(1, $fileId, PDO::PARAM_INT,60);
$stmt->execute() or die(implode(':', $stmt->errorInfo()));
$cols = $stmt->columnCount();
$row = $stmt->fetch();
header("Content-type: $row[0]");
header("Content-length: $row[2]");
header("Content-disposition: attachment; filename=$row[1]");        
print $row[3];
}
    catch(PDOException $e){
                die ('Connection Failed:' .$e->getMessage());
            }
?>

[Dormilich]

are you sure the code works at all? I’d expect an error when I try to bind a parameter to a non-existing placeholder.

[abhay bharadwaj]

thanks for the reply!..i don't have any idea about php..i am just a beginner to it...i just got this code and executed though..but the problem is the downloaded files are in txt form...so, can you give the code to download files from database?? thanks in advance

[Dormilich]

if the downloaded files are in text form there are mainly 2 things to do:
- check the MIME-Type of the received file (I’d temporarly disable the content-disposition for that, so you can better examine the Response headers)
- check the MIME-Types saved in the DB

additionally, in which error mode is PDO running? (the default is no message)

PS. your try...catch gives false information. the connection is established outside of it. and there is no need for die() in a catch() statement.

PPS. rule of thumb: only catch an exception when you can handle the problem.

[abhay bharadwaj]

thanks! this is my upload code, here i am storing the MIME type in a variable and then inserted it into database using varchar to store it in DB.....

 <?php 
include 'core/init.php';
include 'includes/overall/header.php';
?>
      <h1>Questions Papers</h1>
        <?php
        if(isset($_POST['cmdSubmit']) && $_FILES['userFile']['size'] > 0) {
            extract( $_POST );
            $fileName = $_FILES['userFile']['name'];
            $tmpName  = $_FILES['userFile']['tmp_name'];
            $fileSize = $_FILES['userFile']['size'];
            $fileType = $_FILES['userFile']['type'];
            if(!get_magic_quotes_gpc()) {
                $fileName = addslashes($fileName);
            }
            move_uploaded_file ($tmpName, "/temp/$fileName");
            $tmpName = "/temp/$fileName";
 
#$tmpName="c:/tmp/test.txt";
            //echo "<h1>Opening: $tmpName </h1>";
 
            $fp      = fopen($tmpName, 'r');
            $content = fread($fp, filesize($tmpName));
#        $content = addslashes($content);
            fclose($fp);
 
            $dsn = 'mysql:dbname=lr;host=localhost;';
            $user= 'root';
            $password='';
 
            try {
                $dbh = new PDO($dsn, $user, $password);
 
                $insertSQL = $dbh->prepare(
                        "INSERT INTO documents (email, full_name, file_name, " .
                            "file_size, file_bytes, file_type, received) VALUES (?,?,?,?,?,?,SYSDATE())")
                        or die ($mysqli->error);
 
                $insertSQL->bindParam(1, $email, PDO::PARAM_STR, 60);
                $insertSQL->bindParam(2, $fullName, PDO::PARAM_STR, 60);
                $insertSQL->bindParam(3, $fileName, PDO::PARAM_STR, 60);
                $insertSQL->bindParam(4, $fileSize, PDO::PARAM_INT, 60);
                $insertSQL->bindParam(5, $content, PDO::PARAM_STR, $fileSize);
                $insertSQL->bindParam(6, $fileType, PDO::PARAM_STR, 60);
 
                echo "<h1>About to upload $fileName to database! $fileSize</h1>";
                $insertSQL->execute() or die ("<p>Upload Error: $insertSQL->error</p>");
            } catch (PDOException $e) {
                die ('Connection failed: '.$e->getMessage());
            }
 
            echo "<br>File $fileName uploaded<br>";
        }
        ?>
        <a href="questions.php">Return to file list</a>
 
 
 
 
<?php include 'includes/overall/footer.php';?>

and here's my db sql

CREATE TABLE IF NOT EXISTS `documents` (
  `file_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `email` varchar(250) DEFAULT NULL,
  `full_name` varchar(250) DEFAULT NULL,
  `file_name` varchar(250) DEFAULT NULL,
  `file_size` int(11) DEFAULT NULL,
  `file_type` varchar(250) DEFAULT NULL,
  `file_bytes` mediumblob,
  `received` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`file_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=17 ;
 
 

[Dormilich]

this is my upload code, here i am storing the MIME type in a variable and then inserted it into database using varchar to store it in DB.....

that was not the question. it was "what MIME type did you receive upon downloading?"

some comments to the code:
- never do a DB connection with the root user unless for DB administration. ever!
- don’t use addslashes() to escape DB content. a prepared statement will retain them and \ is not an escape character in HTML or plain text.
- don’t die() in a catch() statement (see above)
- the $mysqli variable does not exist
- so does the ->error property (PDO uses ->errorInfo())

[abhay bharadwaj]

oh ok!..thank you for your patience having with me.. can you change the above code and send it back here?? because i didn't understand what you said, so please help me!

[Dormilich]

what browser do you use?

[abhay bharadwaj]

oh! sorry for late reply..i use google chrome

[Dormilich]

finding headers in Chrome:
- open the developer tools (F12)
- go to "Network" tab
- load page (download script) in the browser window
- check what’s written in the "Status text" column in the Dev Tools

[abhay bharadwaj]

thank you!..the status displayed 'success'..if you don't mind will you give your email id please?? i can clarify many doubts with you regarding php

[Dormilich]

argh, for the MIME type you need of course the "Type" field (should be the next one), my bad.

[abhay bharadwaj]

sorry!..its showing type='text/plain' status="cancelled"...what it indicates?? and what should i do to correct it...

[Dormilich]

you probably have an error interferring ...

... or you really send a text header.

[abhay bharadwaj]

thank you sir!..i fixed the problem!...now, i want the php code to see online users. so can you help me with this or can you send any link regarding to this?? thanks in advance

[Dormilich]

i want the php code to see online users

what does that mean?

[abhay bharadwaj]

php code to display the users who are online?

[Dormilich]

how should I know?

you’ll probably find sufficient scripts via google, but I imagine that you need some kind of intermediat storage (DB, File) to have cross-user access.

[abhay bharadwaj]

ok..thank you sir! for having time with me..