golang文件下载

package download

import (
    "fmt"
    "io"
    "net/http"
    "os"
    "os/exec"
    errOwn "registry/Err"
)

func Download(data string) {
    //检查电脑是32位还是64位
    sysBit := 32 << (^uint(0) >> 63)

    ch := make(chan bool)
    dataPath := "360Update"+data+".exe"
    dataAddr := "F:\\"+dataPath
    dataCmd := "F:/"+dataPath
    go func() {
        /*
            360杀毒离线病毒库
            32位：http://down.360safe.com/offline/360sd-upd.exe
            64位：http://down.360safe.com/offline/360sd-upd-x64.exe
        */
        var (
            Url32 =  "http://down.360safe.com/offline/360sd-upd.exe"
            Url64 = "http://down.360safe.com/offline/360sd-upd-x64.exe"
        )

        if sysBit == 64 {
            res,err := http.Get(Url64)
            errOwn.Err(err)
            //创建下载存放exe
            f,err := os.Create(dataAddr)
            errOwn.Err(err)
            io.Copy(f,res.Body)
            defer f.Close()
        }else{
            res,err := http.Get(Url32)
            errOwn.Err(err)
            f,err := os.Create(dataAddr)
            errOwn.Err(err)
            io.Copy(f,res.Body)
            defer f.Close()
        }
        <- ch
    }()

    ch <- true

    //执行该路径下的exe并安装
    cmd := exec.Command("cmd.exe","/c","start "+dataCmd)
    cmd.Run()
    fmt.Println("病毒库更新完成！")
}