Using barcode component, work good but 500 status

Questions Components & MVC
,
1

I wanna to output a barcode image stream. My action code as follow:

 public function barcodeAction()
    {
        $barcode = $this->getRequest()->getQuery('barcode','JOKE1234');
        $barcodeOptions = ['text' => $barcode,'barHeight' => 70];
        $rendererOptions = [];
        return Barcode::render(
            'code39',
            'image',
            $barcodeOptions,
            $rendererOptions
        );
    }

The barcode picture show well, it seems work good, I did not use a code reader to test.

11111
111111441×478 37 KB

How to resolve this?

2

Try to call the URL for the barcode in the browser and you will see that an image cannot be the return type of a controller action.

3

2222
22221266×598 25.2 KB

33333
33333983×809 33 KB

4

It’s still a 500 error.

Btw. do you use the controller plugin AcceptableViewModelSelector?

5

No, there is no special acceptableViewModelSelector setted in my code.

6

You must create a correct response, the barcode renderer returns an image in your case which can not be used a return type of a controller action.

Some pseudo code:

public function barcodeAction()
{
    $image = Barcode::render(…);
    
    $response = $this->getResponse();
    $response->setContent($image);
    $response
        ->getHeaders()
        ->addHeaderLine('Content-Transfer-Encoding', 'binary')
        ->addHeaderLine('Content-Type', 'image/png')
        ->addHeaderLine('Content-Length', mb_strlen($image));

    return $response;
}
7

Thanks for your reply!

Now my action is

public function barcodeAction()
    {
        $barcode = $this->getRequest()->getQuery('barcode','JOKE1234');
        $barcodeOptions = ['text' => $barcode,'barHeight' => 70];
        $rendererOptions = [];
        $image = Barcode::render(
            'code39',
            'image',
            $barcodeOptions,
            $rendererOptions
        );

        $response = $this->getResponse();
        $response->setContent($image);
        $response
            ->getHeaders()
            ->addHeaderLine('Content-Transfer-Encoding', 'binary')
            ->addHeaderLine('Content-Type', 'image/png')
            ->addHeaderLine('Content-Length', mb_substr($image));

        return $response;
    }

44444
44444922×612 22.6 KB

8

Please check your server logs, the error must be listed there.

9

yesterday, I mistaken the mb_strlen to mb_substr, however in this case, the barcode picture shows great.

Just now, I corrected it from mb_substr to mb_strlen, then nothing shows!!! no picture at all.

I checked over the /var/log/nginx/error.xxx.log, nothing related found!!!

10

You can check if the alternative works: strlen

PHP basics: error reporting! :wink:

11

not work when I change mb_strlen to strlen

I am working on the php error log, I am not familar with linux system, I need time

12

I run the project locallly with php -S 0.0.0.0:8080 -t public

11111
11111879×554 12.2 KB

the 500 server error here
[Thu Sep 2 11:49:33 2021] 127.0.0.1:58986 [500]: GET /application/outcome/barcode?barcode=2021090214

no further detail infomartion can refer.