How to use the Webman framework to realize web page screenshots and PDF generation functions?

How to use the Webman framework to implement web page screenshots and PDF generation functions?

Webman is an excellent web development framework that provides many convenient functions and tools, including web page screenshots and PDF generation. This article will introduce how to use the Webman framework to achieve these two practical functions.

First, we need to install the Webman framework. You can use Composer to install it with the following command:

composer require webman/webman

After the installation is complete, we can create a new controller to implement the functions of web page screenshots and PDF generation. In the controller file, we can use the built-in functions and classes provided by Webman to achieve the required functionality.

The implementation of the web page screenshot function is as follows:

use WorkermanProtocolsHttpResponse;
use WebmanApp;

class ScreenshotController
{
    public function screenshot()
    {
        // 获取需要截图的网页地址
        $url = App::request()->query('url', 'https://www.example.com');
        
        // 使用Webman提供的内置函数进行网页截图
        $imageData = App::worker()->screenshot($url);
        
        // 将截图数据返回给客户端
        return new Response($imageData, 200, ['Content-Type' => 'image/png']);
    }
}

In the above code, we first obtain the web page address that needs to be screenshot, and then use the App::worker()->screenshot() method Take a screenshot of a web page. Finally, the screenshot data is returned to the client.

The implementation of the PDF generation function is as follows:

use WorkermanProtocolsHttpResponse;
use WorkermanProtocolsHttpFile;
use WebmanApp;
use DompdfDompdf;

class PdfController
{
    public function generatePdf()
    {
        // 获取需要生成PDF的网页地址
        $url = App::request()->query('url', 'https://www.example.com');
        
        // 创建Dompdf实例
        $dompdf = new Dompdf();
        
        // 使用Webman提供的内置函数获取网页内容
        $html = App::worker()->get($url);
        
        // 将网页内容加载到Dompdf中
        $dompdf->loadHtml($html);
        
        // 渲染PDF
        $dompdf->render();
        
        // 获取PDF内容
        $pdfData = $dompdf->output();
        
        // 将PDF保存到文件并返回给客户端
        $filename = 'generated_pdf.pdf';
        $filepath = '/tmp/'.$filename;
        file_put_contents($filepath, $pdfData);
        
        return new File($filepath, null, false);
    }
}

In the above code, we first obtain the web page address that needs to generate PDF, and then create a Dompdf instance. Next, use the App::worker()->get() method to get the web page content and load it into Dompdf. Then, render the PDF and save the contents to a file. Finally, we return the saved PDF file to the client.

Through the above steps, we can realize the functions of web page screenshots and PDF generation in the Webman framework. These two functions can be very useful when developing web applications, helping us better page presentation and content generation. In actual use, we can make appropriate adjustments and optimizations according to specific needs. I wish you happy development using the Webman framework!

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