How to use PHP to develop the printing service function of WeChat applet?

How to use PHP to develop the printing service function of WeChat applet?

With the popularity of WeChat mini programs, more and more companies and individuals have begun to develop their own mini programs to meet the various needs of users. Among them, printing service is a very common and practical function. This article will introduce how to use PHP to develop the printing service function of WeChat applet and provide specific code examples.

Print service means that users can send files that need to be printed to the printer for printing through the WeChat applet. To develop such a printing service function, you need to meet the following steps:

1. Get the Access Token of the WeChat applet
2. Upload the print file to the WeChat server
3. Create Print task
4. Query print results

Below we introduce the specific implementation of each step in detail:

1. Get the Access Token of the WeChat applet

Before developing the WeChat applet, we need to obtain the Access Token of the applet for authentication of subsequent interface requests. The interface for obtaining Access Token is as follows:

$appId = 'your_app_id';  // 替换为你自己的小程序的AppID
$appSecret = 'your_app_secret';  // 替换为你自己的小程序的AppSecret

$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$appId."&secret=".$appSecret;

$response = file_get_contents($url);
$data = json_decode($response, true);

$accessToken = $data['access_token'];

2. Upload print files to WeChat server

When the user sends a request to print a file, we need to upload the file to the WeChat server first superior. The interface for uploading files is as follows:

$url = "https://api.weixin.qq.com/wxa/uploadmedia?access_token=".$accessToken."&type=file";

$filePath = './path/to/your/file.pdf';  // 替换为你自己要上传的文件路径

$postData = array(
    'media' => new CurlFile($filePath)
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
curl_exec($ch);
curl_close($ch);

3. Create a print task

After the file is uploaded successfully, we can create a print task through the print task interface. The specific code is as follows:

$url = "https://api.weixin.qq.com/wxa/addnearbyprinter?access_token=".$accessToken;

$postData = array(
    'open_id' => 'your_open_id',  // 替换为用户的OpenID
    'printer_id' => 'your_printer_id',  // 替换为打印机的ID
    'file_url' => 'your_file_url',  // 替换为文件的下载链接
    'origin_id' => 'your_origin_id',  // 替换为任务的唯一标识
    'preview' => 'true'  // 是否需要预览
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postData));
curl_exec($ch);
curl_close($ch);

4. Query the print results

Finally, we can obtain the status and results of the print task through the interface for querying the print results. The specific code is as follows:

$url = "https://api.weixin.qq.com/wxa/querylist?access_token=".$accessToken;

$postData = array(
    'open_id' => 'your_open_id',  // 替换为用户的OpenID
    'origin_id' => 'your_origin_id'  // 替换为任务的唯一标识
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postData));
curl_exec($ch);
curl_close($ch);

The above are the detailed steps and code examples for using PHP to develop the printing service function of the WeChat applet. Through the above code, we can easily implement the printing service function of the WeChat applet to meet the printing needs of users. Hope this article can be helpful to you.

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