Applet in conjunction with the development of cloud acquisition applet code

Recent development of small encounters an applet code generating function, normal operation is requested by the interface:

POST https://api.weixin.qq.com/wxa/getwxacode?access_token=ACCESS_TOKEN

But today, suddenly want to go unusual way, we decided to use a cloud development and play.

Man of few words said, the code it!

wxml：

< The Button bindstap = "creatCode" > Click for </ the Button >

 

Cloud function, I define a getcode function, the first to function under a cloud config.json file permissions are configured at call

config.json:

openapi.wxacode.get

 

Then write to the inside index.js logic code:

index.js:

const cloud = require('wx-server-sdk')

cloud.init()

exports.main = async (event, context) => {
  try {
    const result = await cloud.openapi.wxacode.get({
        path: 'page/index/index',
        width: 430
      })
    console.log(result)
    return result
  } catch (err) {
    console.log(err)
    return err
  }
}

 

Finally, call the above method creatCode cloud function

js:

creatCode(){
    console.log('开始生成小程序码')
    wx.cloud.callFunction({
      name:'getcode',
      data:{},
      success:res=>{
          console.log(res)
          let fileManager = wx.getFileSystemManager();
          let filePath = wx.env.USER_DATA_PATH+'/qr.jpg';
          fileManager.writeFile({
            filePath:filePath,
            encoding:"binary",
            data:res.result.buffer,
            success:res=>{
              console.log(res)
              wx.previewImage ({ //Image Preview 

                URLs: [filePath], 

              }) 


            } 
          }) 
      }, 
      Fail: ERR => { 

      } 
    }) 
    

}

Checked the official documents, the function returns the cloud data is a binary data objects and data types include, ArrayBuffer is a type of things

Here encountered a pit, this type directly into base64 and then call out the image tab on the micro-channel development tools can be out, but the real machine on gg, and directly blank

This data needs to keep costs to a temporary file

So by

let fileManager = wx.getFileSystemManager()

fileManager.writeFile

Save the binary data.

Get away!