【Golang】调用syscall调用windows dll弹窗

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package main
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import (
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    "fmt"
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    "syscall"
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    "time"
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    "unsafe"
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)
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const (
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    MB_OK                = 0x00000000
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    MB_OKCANCEL          = 0x00000001
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    MB_ABORTRETRYIGNORE  = 0x00000002
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    MB_YESNOCANCEL       = 0x00000003
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    MB_YESNO             = 0x00000004
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    MB_RETRYCANCEL       = 0x00000005
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    MB_CANCELTRYCONTINUE = 0x00000006
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    MB_ICONHAND          = 0x00000010
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    MB_ICONQUESTION      = 0x00000020
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    MB_ICONEXCLAMATION   = 0x00000030
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    MB_ICONASTERISK      = 0x00000040
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    MB_USERICON          = 0x00000080
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    MB_ICONWARNING       = MB_ICONEXCLAMATION
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    MB_ICONERROR         = MB_ICONHAND
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    MB_ICONINFORMATION   = MB_ICONASTERISK
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    MB_ICONSTOP          = MB_ICONHAND
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    MB_DEFBUTTON1 = 0x00000000
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    MB_DEFBUTTON2 = 0x00000100
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    MB_DEFBUTTON3 = 0x00000200
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    MB_DEFBUTTON4 = 0x00000300
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)
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func abort(funcname string, err syscall.Errno) {
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    panic(funcname + " failed: " + err.Error())
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}
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var (
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    user32, _     = syscall.LoadLibrary("user32.dll")
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    messageBox, _ = syscall.GetProcAddress(user32, "MessageBoxW")
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)
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func IntPtr(n int) uintptr {
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    return uintptr(n)
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}
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func StrPtr(s string) uintptr {
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    return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(s)))
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}
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func MessageBox(caption, text string, style uintptr) (result int) {
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    ret, _, callErr := syscall.Syscall9(messageBox,
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        4,
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        0,
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        StrPtr(text),
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        StrPtr(caption),
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        style,
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        0, 0, 0, 0, 0)
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    if callErr != 0 {
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        abort("Call MessageBox", callErr)
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    }
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    result = int(ret)
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    return
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}
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func ShowMessage2(title, text string) {
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    user32 := syscall.NewLazyDLL("user32.dll")
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    MessageBoxW := user32.NewProc("MessageBoxW")
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    MessageBoxW.Call(IntPtr(0), StrPtr(text), StrPtr(title), IntPtr(0))
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}
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func main() {
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    defer syscall.FreeLibrary(user32)
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    num := MessageBox("Title1", "test1", MB_YESNOCANCEL)
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    fmt.Printf("Get Retrun Value Before MessageBox %d\n", num)
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    ShowMessage2("Title2", "test2")
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    time.Sleep(3 * time.Second)
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}
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func init() {
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    fmt.Print("start...\n")
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}