golang调用windows外部程序，并获取输出和返回值

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这是一个创建于的文章，其中的信息可能已经有所发展或是发生改变。

一个常见的例程，作个记录。要点在注释里有。
代码：

package main

import (
    "fmt"
    "os/exec"
    "runtime"
    "syscall"
)

func main() {
    cmd := exec.Command("cmd.exe", "/c", "D:\\docker\\kubectl.exe", "version")
    if runtime.GOOS == "windows" {
        cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}
    }
    //Start执行不会等待命令完成，Run会阻塞等待命令完成。
    //err := cmd.Start()
    //err := cmd.Run()
    //cmd.Output()函数的功能是运行命令并返回其标准输出。
    buf, err := cmd.Output()

    if err != nil {
        if exitErr, ok := err.(*exec.ExitError); ok {
            status := exitErr.Sys().(syscall.WaitStatus)
            switch {
            case status.Exited():
                fmt.Printf("Return exit error: exit code=%d\n", status.ExitStatus())
            case status.Signaled():
                fmt.Printf("Return exit error: signal code=%d\n", status.Signal())
            }
        } else {
            fmt.Printf("Return other error: %s\n", err)
        }
    } else {
        fmt.Printf("Return OK\n")
        fmt.Println(string(buf))
    }

}

运行：

D:\test\wincmd>wincmd.exe

Return exit error: exit code=1

D:\test\wincmd>wincmd.exe
Return exit error: exit code=1

D:\test\wincmd>wincmd.exe
Return exit error: exit code=1

D:\test\wincmd>wincmd.exe
Return OK
Client Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.4", GitCommit:"8d8aa39598534325ad77120c120a22b3a99
0b5ea", GitTreeState:"clean", BuildDate:"2020-03-12T21:03:42Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"windows/a
md64"}
Server Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.4-rc2+k3s1", GitCommit:"3eee8ac3a1cf0a216c8a660571
329d4bda3bdf77", GitTreeState:"clean", BuildDate:"2020-03-23T17:50:43Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"
linux/amd64"}


D:\test\wincmd>wincmd.exe
Return OK
Client Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.4", GitCommit:"8d8aa39598534325ad77120c120a22b3a99
0b5ea", GitTreeState:"clean", BuildDate:"2020-03-12T21:03:42Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"windows/a
md64"}
Server Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.4-rc2+k3s1", GitCommit:"3eee8ac3a1cf0a216c8a660571
329d4bda3bdf77", GitTreeState:"clean", BuildDate:"2020-03-23T17:50:43Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"
linux/amd64"}

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