How to download files from WeChat applet through back-end PHP
Scenario: The WeChat applet calls the wx.downloadFile() API to download a file, and the PHP backend performs processing and returns the file process;
Process:
1. The applet displays a list of files that need to be downloaded;
2. Click download and request the PHP interface, carrying a parameter for the name of the file you want to download;
3. Receive the parameter in PHP, and then search the folder to see if there is the file;
4. Find file and return the file to the applet;
5. The applet saves the file returned by the backend, click to open the file, and preview the code:
wxml
<view>文件列表</view>
<view wx:for='{{search_store}}' wx:key='{{index}}'>
<view bindtap='dom' id='{{index}}'>文件名：{{item.fileName}} 点击下载</view>
</view> dom: function (e) {
var index = e.currentTarget.id;
var data = this.data.search_store[index].fileName
var that = this;
wx.downloadFile({
url: 'https://dwb.lynncain.cn/H5/dom.php?str=' + data, //下载路径携带 参数=文件名
success: function (res) {
console.log(res.tempFilePath)
wx.saveFile({ //下载成功后保存
tempFilePath: res.tempFilePath,
success: function (res) {
wx.showToast({
title: '下载成功！',
})
wx.getSavedFileList({ //获取下载的文件列表保存到data
success: function (rrr) {
console.log(rrr.fileList)
that.setData({
fileList: rrr.fileList
})
}
})
}
})
}
})
},<?php
header("Access-Control-Allow-Origin: *"); //解决跨域
header('Access-Control-Allow-Methods:GET');// 响应类型
header('Access-Control-Allow-Headers:*'); // 响应头设置
$link=mysql_connect("localhost","root","root");
mysql_select_db("new_test", $link); //选择数据库
mysql_query("SET NAMES utf8");//解决中文乱码问题
error_reporting(0);
$str = $_GET['str'];
$file_path="upload/".$str;
if (! file_exists ( $file_path )) {
header('HTTP/1.1 404 NOT FOUND');
} else {
//以只读和二进制模式打开文件
$file = fopen ( $file_path, "rb" );
//告诉浏览器这是一个文件流格式的文件
Header ( "Content-type: application/octet-stream" );
//请求范围的度量单位
Header ( "Accept-Ranges: bytes" );
//Content-Length是指定包含于请求或响应中数据的字节长度
Header ( "Accept-Length: " . filesize ( $file_path ) );
//用来告诉浏览器，文件是可以当做附件被下载，下载后的文件名称为$file_name该变量的值。
Header ( "Content-Disposition: attachment; filename=" . $str );
//读取文件内容并直接输出到浏览器
echo fread ( $file, filesize ( $file_path ) );
fclose ( $file );
exit ();
}
?>Introduction to bubbling, dichotomy insertion, quick sort algorithm
Explain how PHP supports breaking Related content of the file download class that you click on to resume the upload
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