使用php（utf-8）从mssql检索图像数据

Question

From a php script (PHP 5.3.10-1 on Ubuntu3.6) I connect to an MSSQL Server and I would like to retrive image data from image field type. And I want to print it.

I can get the data from MSSQL but I can't print/echo it as a valid image. How can I print/echo/save it?

$db= new PDO('odbc:MYODBC', '***', '***');
$stmt = $db->prepare("USE database");
$stmt->execute();
$tsql = "SELECT image 
         FROM Pics 
         WHERE id = 12";
$stmt = $db->prepare($tsql);
$stmt->execute();

$stmt->bindColumn(1, $lob, PDO::PARAM_LOB);
$stmt->fetch(PDO::FETCH_BOUND);

header("Content-Type: image/jpg");

echo($lob); //not an image: 424df630030000000000360000002800 ...

imagecreatefromstring($lob);  // Data is not in a recognized format ...

$lob = fopen('data://text/plain;base64,' . base64_encode($lob), 'r'); //Resource
fpassthru($lob); //not an image: 424df63003000000000036000000280000 ...

PHP script encoding: UTF-8.

In /etc/freetds/freetds.conf

[MYODBC]
host = myhost.com
client charset = UTF-8
tds version = 7

((With sqlsrv on the server of MSSQL I could use this:

$image = sqlsrv_get_field( $stmt, 0, 
                      SQLSRV_PHPTYPE_STREAM(SQLSRV_ENC_BINARY));
header("Content-Type: image/jpg");
fpassthru($image);

))

UPDATE :

echo base64_decode($lob); //Not an image: γn­τΣ}4ΣM4ΣM4ί­4ΣM4ΫΝ4ΣM4s­...

Answer 1

Try adding the following headers :

• Content-Disposition
• Content-Transfer-Encoding
• Content-Length

In PHP code :

header('Content-Type: image/jpg');
header('Content-Disposition:attachment; filename="my_file.jpg"');// Set the filename to your needs
header('Content-Transfer-Encoding: binary');
header('Content-Length: 12345');// Replace 12345 with the actual size of the image in bytes

Answer 2

I was recently fighting with a similar storage issue. It turned out that I was quoting my binary image data before insert into the database table. So, make sure you are not adding quotes and turning it into a string - like I accidentally did.

Here's the prep work that is done on an existing local file to get the proper data to store into your database. Also, make sure you have bin2hex() available or get a replacement version of the function.

function prepareImageDBString($filepath) {

    $out = 'null';
    $handle = @fopen($filepath, 'rb');
    if ($handle) {
        $content = @fread($handle, filesize($filepath));
        // bin2hex() PHP Version >= 5.4 Only!
        $content = bin2hex($content); 
        @fclose($handle);
        $out = "0x" . $content;
    }
    return $out;
}

I hope this helps someone.