keydown和KeyPress事件有何不同

KEYPRESS
When?a?windowed?control?receives?a?key-press?message?(WM_CHAR)?from?Windows,?its?message?handler?calls?the?DoKeyPress?method.
说明：响应WM_CHAR消息，不包括一些功能键，如：F1，SHIFT键等

KEYDOWN
When?a?windowed?control?receives?a?key-down?message?(WM_KEYDOWN)?from?Windows,?its?message?handler?calls?the?DoKeyDown?method.?

响应WM_KEYDOWN消息

?

一个是按下去，一个是按下放上来时

?

procedure?TForm1.FormKeyPress(Sender:?TObject;?var?Key:?Char);
begin
??//只能触发单键事件
end;

procedure?TForm1.FormKeyDown(Sender:?TObject;?var?Key:?Word;
??Shift:?TShiftState);
begin
??//在keyDown事件里可以触发shift+A等组合键事件
end;

?

Drate回答正确,其它人都没搞清楚,那是OnKeyUp!其实响应WM_CHAR就是按下字符键时激发,而按下其他功能键无效!procedure?WMChar(var?Message:?TWMChar);?message?WM_CHAR;procedure?TWinControl.WMChar(var?Message:?TWMChar);begin??if?not?DoKeyPress(Message)?then?inherited;end;procedure?WMKeyDown(var?Message:?TWMKeyDown);?message?WM_KEYDOWN;procedure?TWinControl.WMKeyDown(var?Message:?TWMKeyDown);begin??if?not?DoKeyDown(Message)?then?inherited;end;