怎么使得THotKey可以只输入Ctrl呢

如何使得THotKey可以只输入Ctrl呢？
如何使得THotKey可以只输入Ctrl呢？

[解决办法]

Delphi(Pascal) code

procedure TForm1.FormCreate(Sender: TObject);begin  Form1.KeyPreview:=true;end;procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;  Shift: TShiftState);begin  if key = 17 then    showmessage('你按了我设置的热键Ctrl了');end;
[解决办法]
Delphi(Pascal) code
//HotKey1的OnChange事件procedure TForm1.HotKey1Change(Sender: TObject);begin  if HotKey1.Tag = 0 then  begin    if HotKey1.HotKey = scCtrl then//只有Ctrl键按下      HotKey1.Tag := 1    else if HotKey1.HotKey = 0 then    begin      HotKey1.OnChange := nil;      HotKey1.HotKey := scCtrl;      HotKey1.OnChange := HotKey1Change;      HotKey1.Tag := 1;    end;  end  else  begin    if HotKey1.HotKey = 0 then//Ctrl键弹起    begin      HotKey1.OnChange := nil;      HotKey1.HotKey := scCtrl;      HotKey1.OnChange := HotKey1Change;    end;    HotKey1.Tag := 0;  end;end;