How Can I Print to the Command Prompt When Using `-ldflags -H=windowsgui` in Go?

Printing to Command Prompt with -ldflags -H=windowsgui

When compiling a Go application with -ldflags -H=windowsgui, the standard handles for input/output are closed, making it challenging to print output to the command prompt. To overcome this limitation, it is necessary to attach the process to its parent's console.

One method to achieve this is by using the syscall package's AttachConsole function:

package main

import (
    "fmt"
    "syscall"
)

var (
    modkernel32 = syscall.NewLazyDLL("kernel32.dll")
    procAttachConsole = modkernel32.NewProc("AttachConsole")
)

func AttachConsole(dwParentProcess uint32) (ok bool) {
    r0, _, _ := syscall.Syscall(procAttachConsole.Addr(), 1, uintptr(dwParentProcess), 0, 0)
    ok = bool(r0 != 0)
    return
}

func main() {
    ok := AttachConsole(syscall.ATTACH_PARENT_PROCESS)
    if ok {
        fmt.Println("Okay, attached")
    }
}

By calling AttachConsole, the process can gain access to the console and print messages as desired.

If AttachConsole fails, alternative options include creating a GUI dialog or allocating a new console window using AllocConsole. However, displaying messages in a GUI dialog can be more user-friendly and appropriate for displaying version information that is typically associated with the console.

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