Header error when downloading file from server

[ririe]

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs \Inovasi\get_fi le.php:2) in C:\xampp\htdocs \Inovasi\get_fi le.php on line 40

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs \Inovasi\get_fi le.php:2) in C:\xampp\htdocs \Inovasi\get_fi le.php on line 41

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs \Inovasi\get_fi le.php:2) in C:\xampp\htdocs \Inovasi\get_fi le.php on line 42
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when I try to download the file, the above errors occur.I try to fix it but still got errors.Can you please help me...

[Markus]

This post was separated from Atli's post on Uploading to a MySQL database.

Let's have a gander at the file causing the issue. You have sent output to the browser, through one way or another, and, well, you cannot do this.

- mark

[ririe]

thanks for the explaination..
but, what should i do now??
is there any suggestion??

[Markus]

@ririe
Like I said previously: post the sourcecode of the file that is causing the error. We are not psychic, so it would help to see the file.

[ririe]

sorry..this is the code...hope u can help me

<?php
# Connect to the database
$dbLink = mysqli_connect("localhost", "root", "", "inovasi");
if(mysqli_connect_errno()) {
    die("MySQL connection failed: ". mysqli_connect_error());
}
 
# Query for a list of all existing files
$result = mysqli_query($dbLink, "SELECT FileID, FileName, FileMime, FileSize, Created FROM FileStorage");
 
# Check if it was successfull
if($result) 
{
 
    # Make sure there are some files in there
    if(mysqli_num_rows($result) == 0) {
        echo "<p>There are no files in the database</p>";
    }
    else
    {
        # Print the top of a table
        echo "<table width='100%' border='1'><tr>";
        echo "<td><b>Name</b></td>";
        echo "<td><b>Mime</b></td>";
        echo "<td><b>Size (bytes)</b></td>";
        echo "<td><b>Created</b></td>";
        echo "<td><b>&nbsp;</b></td>";
        echo "</tr>";
 
        # Print each file
        while($row = mysqli_fetch_assoc($result))
        {
            # Print file info
            echo "<tr><td>". $row['FileName']. "</td>";
            echo "<td>". $row['FileMime']. "</td>";
            echo "<td>". $row['FileSize']. "</td>";
            echo "<td>". $row['Created']. "</td>";
 
            # Print download link
            echo "<td><a href='get_file.php?id=". $row['FileID'] ."'>Download</a></td>";
            echo "</tr>";
        }
 
        # Close table
        echo "</table>";
    }
 
    # Free the result
    mysqli_free_result($result);
}
else 
{
    echo "Error! SQL query failed:";
    echo "<pre>". $dbLink->error ."</pre>";
}
 
# Close the mysql connection
mysqli_close($dbLink);
?>

[Dormilich]

what's the code in get_file.php (where the error occurs)?

[ririe]

<?php
# Make sure an ID was passed
if(isset($_GET['id']))
{
    # Get the ID
    $id = $_GET['id'];
 
    # Make sure the ID is in fact a valid ID
    if(!is_numeric($id) || ($id <= 0)) {
        die("The ID is invalid!");
    }
 
    # Connect to the database
    $dbLink = mysqli_connect("localhost", "root", "", "inovasi");
    if(mysqli_connect_errno()) {
        die("MySQL connection failed: ". mysqli_connect_error());
    }
 
    # Fetch the file information
    $query = "
        SELECT FileType, FileName, FileSize, FileData 
        FROM fileStorage 
        WHERE FileID = {$id}";
 
    $result = @mysqli_query($dbLink, $query)
        or die("Error! Query failed: <pre>". mysqli_error($dbLink) ."</pre>");
 
    # Make sure the result is valid
    if(mysqli_num_rows($result) == 1)
    {
        # Get the row
        $row = mysqli_fetch_assoc($result);
 
        # Print headers
        header("Content-Type: ". $row['FileType']);
        header("Content-Length: ". $row['FileSize']);
        header("Content-Disposition: attachment; filename=". $row['FileName']);
 
        # Print data
        echo $row['FileData'];
    }
    else
    {
        echo "Error! No image exists with that ID.";
    }
 
    # Free the mysqli resources
    @mysqli_free_result($result);
    @mysqli_close($dbLink);
 
}
else
{
    echo "Error! No ID was passed.";
}
?>

This is the code for get_file.php. When i try to download the file, it says that the errors come from the header part.Hope u can help me.Thank you

[ririe]

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs \Inovasi\get_fi le.php:2) in C:\xampp\htdocs \Inovasi\get_fi le.php on line 36

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs \Inovasi\get_fi le.php:2) in C:\xampp\htdocs \Inovasi\get_fi le.php on line 37

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs \Inovasi\get_fi le.php:2) in C:\xampp\htdocs \Inovasi\get_fi le.php on line 38
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This is the errors come out.I want to view the file first and then the user can download the file.How to do it??
Thank you

[Dormilich]

which are those 3 lines?

[Markus]

@Dormilich
The header() lines in his previous post.

It's strange, though, I don't see any output prior to those calls.

Make sure you have no whitespace before the opening <?php tag.