labelctl/msgbox_windows.go at master · mherrera53/labelctl · GitHub

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//go:build windows

package main

import (
	"syscall"
	"unsafe"
)

var (
	user32     = syscall.NewLazyDLL("user32.dll")
	messageBox = user32.NewProc("MessageBoxW")
)

// showMessage shows a native Windows message box (works even without a console).
func showMessage(title, text string) {
	titlePtr, _ := syscall.UTF16PtrFromString(title)
	textPtr, _ := syscall.UTF16PtrFromString(text)
	messageBox.Call(
		0,
		uintptr(unsafe.Pointer(textPtr)),
		uintptr(unsafe.Pointer(titlePtr)),
		0x00000040, // MB_ICONINFORMATION
	)
}

// showError shows a native Windows error message box.
func showError(title, text string) {
	titlePtr, _ := syscall.UTF16PtrFromString(title)
	textPtr, _ := syscall.UTF16PtrFromString(text)
	messageBox.Call(
		0,
		uintptr(unsafe.Pointer(textPtr)),
		uintptr(unsafe.Pointer(titlePtr)),
		0x00000010, // MB_ICONERROR
	)
}