HTTP Image output gives blob data instead of image

Question

My url looks like ..../image/view?id=6

Navigating to this url should give an image from my database. But currently I'm getting a bunch of weird characters as a response.

When I output (see below) I'm seeing my image.

<img src="data:image/jpeg;base64,'.base64_encode( $image->Data ).'"/>

I'm using this piece of code to generate my HTTP response, but the response is just the blob data:

 header('Content-Type :'.$image->Extension);
 header('Content-Disposition: filename='.$image->Name.'.'.$image->Extension);
 header('Content-Length: ' . strlen($image->Data));
 $response->format = Response::FORMAT_RAW;
 $response->data = $image->Data;

Current output begins with:

����JFIF��>CREATOR: gd-jpeg v1.0 (using IJG JPEG v90), default quality ��C     $.' ",#(7),01444'9=82<.342��C     2!!22222222222222222222222222222222222222222222222222���"��    ���}!1AQa"q2���#B��R��$3br�

Headers used:

   Accept-Ranges: bytes
   Cache-Control: private
   Content-Disposition: inline;        filename="FYdsl67l4PWJQ7QFFeo14Ena76gr0pEP.jpg"
   Content-Length: 320135
   Content-Type: image/jpeg
   Date: Mon, 28 Jan 2019 19:05:11 GMT
   Expires: 0
   Pragma: public
   Server: Microsoft-IIS/8.5
   X-Powered-By: PHP/5.6.24, ASP.NET

Any help would be appreciated

check your content type header. for more details check this stackoverflow.com/questions/2633908/… — Sooraj N Raju
– Sooraj N Raju, Commented Jan 26, 2019 at 8:54
Thx for the suggestion, but unfortunately, stil the same result. My headers are now: prntscr.com/mcehqy — brouckaertd
– brouckaertd, Commented Jan 26, 2019 at 9:49

Difster · Accepted Answer · 2019-01-26 08:58:35Z

2

If your image is base64 encoded when it goes in to the database, to display it, you either need to

Use base64_decode($img) and then display it. OR
Do this: echo '<img src="data:image/jpeg;base64,' . $image->Data . '"/>;

What you seem to be doing is encoding it again.

answered Jan 26, 2019 at 8:58

Difster

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3 Comments

brouckaertd Over a year ago

Hi, the data isn't base64 encoded. When I print the data to the browser it starts with: ��JFIF��>CREATOR: gd-jpeg v1.0 (using IJG JPEG v90), default quality ��C $.' ",#(7),01444'9=82<.342��C 2!!22222222222222222222222222222222222222222222222222��"�� }!1AQa"q2��#B��R��$3br� %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz��

Difster Over a year ago

Does it have the jpeg extension? Is it just this one image or all of them? What is the data type it's being stored as in the database?

brouckaertd Over a year ago

It is all of them :(. Installed a new database, and restored a backup of my previous database. Everything works fine. Except all my images and files in the database are having the same issue. I've added a new image to my database, but still the same problem :( I'm saving a binary string to the database, the database field has the type mediumblob

rob006 · Accepted Answer · 2019-01-26 20:52:37Z

0

You should probably use Response::sendContentAsFile() to send this file:

return Yii::$app->response->sendContentAsFile(
    $image->Data, 
    $image->Name . '.' . $image->Extension, 
    ['mimeType' => FileHelper::getMimeTypeByExtension($image->Name . '.' . $image->Extension)]
);

Note that Conent-Type header is not the same as file extension - refer to FileHelper::getMimeTypeByExtension().

answered Jan 26, 2019 at 20:52

rob006

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5 Comments

brouckaertd Over a year ago

Tested the code, the image is downloaded immediately to my pc. Unfortunately, the image seems to be "damaged / corrupted or is too large". While I'm able to display my image in an img tag by using base64 (but this isn't my preferred solution)

rob006 Over a year ago

Are you sure you're not adding any excessive headers? Or output before file sending?

brouckaertd Over a year ago

Hi, I've changed my code back to the original and added the headers to the question. The data is a binary string, which is in my database of type medium blob

rob006 Over a year ago

You have two Content-Type headers. You need to figure out source of Content-Type: text/html; charset=UTF-8 header.

brouckaertd Over a year ago

Changed my code to your sample, but added the parameter 'inline' => true. The headers are more correct (question has been updated). But the image is still not visible on the link I'm using

brouckaertd · Accepted Answer · 2019-04-03 17:55:11Z

0

Issue has been fixed, seems that my file was in an incorrect encoding ... File needed to be iso instead of utf-8

answered Apr 3, 2019 at 17:55

brouckaertd

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