如何修复'file_get_content'无法打开流

Question

i'm using cups-ipp to print from web project

and i got this error

file_get_contents(./helloworld.pdf): failed to open stream: No such file or directory

I tried to get file from storage but got the same error

        $builder = new Builder();

        $responseParser = new ResponseParser();

        $printerManager = new PrinterManager($builder, $client, $responseParser);
        $printer = $printerManager->findByUri('ipp://localhost:631/printers/HP_HP_ColorLaserJet_MFP_M278-M281');

        $jobManager = new JobManager($builder, $client, $responseParser);
        $filePath = '../../../storage/app/public/estimated_dates.pdf';

        $job = new Job();
        $job->setName('job create file');
        $job->setUsername('demo');
        $job->setCopies(1);
        $job->setPageRanges('1');
        $job->addFile('./helloworld.pdf');
        $job->addAttribute('media', 'A4');
        $job->addAttribute('fit-to-page', true);
        $result = $jobManager->send($printer, $job);

I linked storage and I'm sure that the path is correct (I also used auto complete path plugin)

Answer 1

Try to make use of Laravel's base_path() helper.

base_path() is equal to the root of your project. So, let's, for example, you want to access estimated_dates.pdf. The correct solution would be:

base_path('storage/app/public/estimated_dates.pdf');

However, you could make use of:

php artisan storage:link

and you can access the file by: asset('estimated_dates.pdf')

I guess your helloworld.pdf is in root of the application, so:

base_path('helloworld.pdf')

base_path(): https://laravel.com/docs/5.8/helpers#method-base-path

storage:link: https://laravel.com/docs/5.8/filesystem#configuration