在Laravel 5.2中流式传输PDF文件 [英] Stream a PDF file in Laravel 5.2

问题描述

大家好！我正在使用Laravel 5.2应用程序，用户可以在其中下载各种文件.其中之一是用户指南"，它解释了网站的设置方式和功能等.我希望将PDF传输到另一页中，以便用户仍在应用程序中.我正在使用的控制器是:

Hi everyone! I'm working on a Laravel 5.2 application in which the user can download a variety of files. One of these is a 'User guide', explaining how the website is set up and functionalities etc. I would like the PDF to be streamed in another page, so that the user is still within the application. The controller which I am using is:

public function userguidePDF(){

    return response()->stream('../public/download/userguide.pdf');

}

但这返回:

参数1传递给Symfony \ Component \ HttpFoundation \ StreamedResponse :: __ construct()必须可调用，给定字符串，被调用/path/to/laravel/vendor/laravel/framework/src/Illuminate/Routing/ResponseFactory.php在第117行并已定义

Argument 1 passed to Symfony\Component\HttpFoundation\StreamedResponse::__construct() must be callable, string given, called in /path/to/laravel/vendor/laravel/framework/src/Illuminate/Routing/ResponseFactory.php on line 117 and defined

我已经在互联网上搜索了一种方法，这使我想到了以下语法:

I have searched on the internet for a method, which leaded me to the following syntax:

 return response()->stream($callback, 200, $headers);

不幸的是，由于我不了解这些参数，因此无法找到有关该参数的更多文档.有人可以向我解释一下 $ callback，200，$ header 是什么参数，如何使用呢?

Unfortunately, I am unable to find more documentation on the parameters because I don't understand them. Could someone please explain to me what the $callback, 200, $header are as parameters and how I can use this?

推荐答案

https://laravel.com/docs/5.2/responses#view-responses

public function userguidePDF() {

    return response()->file(
        public_path('download/userguide.pdf')
    );

}

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