controllers/wallpaper.go

package controllers

import (
    "github.com/astaxie/beego"
    "fmt"
    "strings"
    "io/ioutil"
    "os/exec"
    "os"
)

type MsgBean struct {
    Status string
    Message string
}

type WallPaperController struct {
    beego.Controller
}

func exec_shell(cmd string) MsgBean(output []byte, err error)  {
    arr := strings.Split(cmd, " ")
    command := exec.Command(arr[0], arr[1:len(arr)]...)
    output, err = command.Output()
    return
}

func (c *WallPaperController) Get() {
    // read config file 从配置文件读取照片文件夹
    var imgPath string = "/home/alonebo/图片/background/"
    HOME := os.Getenv("HOME")
    content, err := ioutil.ReadFile(HOME + "/.gowalpaper.conf")

    parmBg := c.GetString("bg")
    monitorNum := c.GetString("monnum")

    if monitorNum == "" {
        monitorNum = "0" // 如果没传递了显示器参数 那么默认设置为0
    }

    if err != nil {
        errs := fmt.Sprintf("%s", err)
        c.Data["json"] = MsgBean{"error", string(errs)}
        c.ServeJSON()
        return
    }
    contents := strings.Replace(string(content), "n", "", -1)
    if contents != "" {
        fmt.Println("content = " + contents)
        imgPath = contents
    }
    
    // xfce desktop's change walpaper command
    cmd := "/usr/bin/xfconf-query -c xfce4-desktop -p /backdrop/screen0/monitor"+monitorNum+"/workspace0/last-image -s " + imgPath + "/"
    
    bgName := "pubg2.jpg"
    
    if parmBg != "" {
        bgName = parmBg
    }
    cmd += bgName
    fmt.Println("cmd = " + cmd)

    // exec switch walpaper
    output, err := exec_shell(cmd)
    if err != nil {
        fmt.Println("Execute Command failed:" + err.Error())
        c.Data["json"] = MsgBean{"error", string(output)}
        return
    }


    fmt.Println("Execute Command finished. result->",  string(output))
    {
        // test code
        var msg MsgBean
        msg.Status = "ok"
        msg.Message = "ok"

        var msg2 *MsgBean = new(MsgBean)
        msg2.Status = "ok"
        msg2.Message = "ok"

        // msg3 := &MsgBean{"ok", "ok"}

        // c.Data["json"] = msg
    }

    // if no err omit, return success json message
    c.Data["json"] = MsgBean{"ok", "success"}
    c.ServeJSON()
}

主要逻辑是从home目录读取配置文件，得到切换需要的壁纸的目录。调用xfce命令进行切换壁纸，这里默认是单屏幕。

controllers/task.go

package controllers

import (
    "fmt"

    "github.com/astaxie/beego"

    // "strings"
    // "bytes"
    "github.com/astaxie/beego/toolbox"
    // "time"
    "io/ioutil"
    "math/rand"
    "net/http"
)

type TaskController struct {
    beego.Controller
}



func switchTask() error {
    fmt.Println("switch tasks")
    // 读取照片文件夹的照片名 切换
    files, _ := ioutil.ReadDir("/home/alonebo/图片/background")
    var fileList []string

    for _, file := range files {
        if file.IsDir() {
            continue
        } else {
            fileList = append(fileList, file.Name())

        }
    }
    fmt.Println(fileList)

    randBgName := fileList[rand.Intn(len(fileList))]
    randBgName2 := fileList[rand.Intn(len(fileList))]

    resp, err := http.Get("http://localhost:8080/hello?bg=" + randBgName)
    resp2, err2 := http.Get("http://localhost:8080/hello?monnum=1&bg=" + randBgName2)
    if err != nil {
        fmt.Println(err)
        return err
    }
    if err2 != nil {
        fmt.Println(err2)
        return err2
    }
    defer resp.Body.Close()
    defer resp2.Body.Close()
    return nil
}

// 停止任务
func (c *TaskController) Get() {

    stop := c.GetString("stop")
    fmt.Println("stop =" + stop)
    defer c.ServeJSON()
    if stop == "true" {
        fmt.Println("stop task")
        toolbox.StopTask()
        c.Data["json"] = MsgBean{"ok", "stop task success"}

        return
    }

    tk := toolbox.NewTask("myTask", "0/5 * * * * *", switchTask) // 设置5s触发一次任务

    toolbox.AddTask("myTask", tk)
    toolbox.StartTask()

    c.Data["json"] = MsgBean{"ok", "start task success"}
}

开启一个切换壁纸的任务，使用beego的自带的任务模块。不断的调用自身的切换壁纸的http请求。
需要注意的是，要关闭文件描述符。

前端编写

<template>
  <div>
    <img v-for="(item, index) in fileList" v-bind:src="'//localhost:8081/static/'+item" 
    v-bind:key="index" @click="choice($event, item, index)" :class="{select: cur==index}"
    >
    <md-button class="md-fab md-fixed md-fab-bottom-right" @click="change()">
        <md-icon>done</md-icon>
      </md-button>
  </div>
</template>

<script>
/* eslint-disable */
import axios from "axios";

export default {
  name: "WallPaper",
  data: ()=>{
    return {
        fileList: ["pubg3.jpg", "pubg2.jpg"],
        cur: -1,
        curImg: ''
    }
  },
  created() {
    axios.get("/wallpaper/").then(resp => {
      console.log(resp.data);
      this.fileList = resp.data
    });
  },
  methods: {
      choice(e, curImg, index) {
          this.cur = index
          this.curImg = curImg
      },
      change() {
          if (this.cur == -1) {
              alert("你没有选择壁纸")
          }else {
              axios.get("wallpaper/wallpaper?bg="+this.curImg).then(resp=>{
                  console.log(resp)
              })
          }
      }
  }
};
</script>

<style scoped>
div {
    padding: 0;
    margin-left: 10%;
}
img {
    width: 30%;
    height: 300px;
}

.select {
    border: 5px solid red
}
</style>

效果

截图_jianshu.png