How Can I Prevent the Command Prompt Window from Appearing When Using `exec.Command()` in Go?

Hiding Command Prompt Window Using Exec in Go

In Go, the exec.Command() function can be used to execute external commands. However, by default, this function displays the command prompt window while the command is running. To prevent this window from appearing, you can set the HideWindow field of syscall.SysProcAttr to true.

package main

import (
    "log"
    "os"
    "syscall"

    "github.com/pkg/exec"
)

func main() {
    process := exec.Command("cmd", "/c", "dir")
    process.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}

    err := process.Start()
    if err != nil {
        log.Print(err)
    }
    process.Wait() // Wait for the command to finish before exiting.
}

However, this method may not always work, especially when used in Windows. Even with HideWindow set to true, the command window may still appear briefly.

Alternative Solution

A more reliable solution is to use syscall to create a new process with the SW_HIDE flag. This ensures that the new process runs without a visible window.

package main

import (
    "log"
    "os"
    "os/exec"
    "syscall"
)

func main() {
    cmdPath, _ := exec.LookPath("cmd")

    si := syscall.StartupInfo{
        Flags:              syscall.STARTF_USESHOWWINDOW,
        CreationFlags:      0x00000008, // SW_HIDE
    }

    pi := syscall.ProcessInformation{}
    _, _, err := syscall.CreateProcess(cmdPath, syscall.Syscall0(uintptr(len(cmdPath))), nil, nil, false, syscall.CREATE_NEW_CONSOLE, 0, nil, &si, &pi)
    if err != nil {
        log.Fatal(err)
    }
    syscall.CloseHandle(pi.Thread)
    syscall.CloseHandle(pi.Process)
    os.Exit(0)
}

With this method, the command prompt window will not appear at all when exec.Command() is called.

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