package main 
 
import ( 
    "syscall" 
    "unsafe" 
) 
 
var ( 
    user32, _          = syscall.LoadLibrary("user32.dll") 
    procMessageBoxW, _ = syscall.GetProcAddress(user32, "MessageBoxW") 
)
 
func MessageBox(hwnd uintptr, text string, caption string, style uintptr) (int32) { 
    ret, _, _ := syscall.Syscall6(
        uintptr(procMessageBoxW), 
        4, 
        hwnd,
        uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(text))), 
        uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(caption))), 
        style, 
        0,
        0 ) 
    return int32(ret)
} 
 
func main() { 
    defer syscall.FreeLibrary(user32) 
    MessageBox( 0, "Hello, Win32 API(Go) World!", "Hello, World!", 0 )
}