RegisterEventHotKey failed

Registration failed, check your inHotKeyModifiers parameter

  UInt32 keyCode = kVK_ANSI_Keypad1;
  EventHotKeyID gMyHotKeyID;
  gMyHotKeyID.signature = (FourCharCode)'1234';
  gMyHotKeyID.id = 1;
  EventHotKeyRef hotKeyRef;
  OSStatus status = RegisterEventHotKey(keyCode, cmdKey, gMyHotKeyID, GetApplicationEventTarget(), 0, &hotKeyRef);
  if (status == noErr) {
    NSLog(@"success!");
  } else {
    NSLog(@"fail：%d", status);
  }