我想做一个按任意键显示,然后再按任意键取消显示的功能,不知道我下面的代码那里出错了,按键盘就是没有反应
请大虾提供点意见,最好有代码可供参考,谢谢
unit Unit1; interface uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls; type
TForm1 = class(TForm)
Label1: TLabel;
procedure FormCreate(Sender: TObject);
procedure FormKeyPress(Sender: TObject; var Key: Char);
private
{ Private declarations }
public
{ Public declarations }
end; var
Form1: TForm1; implementation {$R *.dfm} procedure TForm1.FormCreate(Sender: TObject);
begin
Self.KeyPreview := True;
end; procedure TForm1.FormKeyPress(Sender: TObject; var Key: Char);
begin
if key <> #0 then
label1.Caption :='1111';
end; end.
请大虾提供点意见,最好有代码可供参考,谢谢
unit Unit1; interface uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls; type
TForm1 = class(TForm)
Label1: TLabel;
procedure FormCreate(Sender: TObject);
procedure FormKeyPress(Sender: TObject; var Key: Char);
private
{ Private declarations }
public
{ Public declarations }
end; var
Form1: TForm1; implementation {$R *.dfm} procedure TForm1.FormCreate(Sender: TObject);
begin
Self.KeyPreview := True;
end; procedure TForm1.FormKeyPress(Sender: TObject; var Key: Char);
begin
if key <> #0 then
label1.Caption :='1111';
end; end.
用DELPHI如何获取EXCEL表格某一列的最大行数
比如说怎么知道,A列用了多少行,而不考虑B列、C列或其他列。
//ado连上xls,遍历一下
ADOConnection1.ConnectionString := 'Provider=Microsoft.Jet.OLEDB.4.0;' +
'Data Source=''d:\xx.xls'';' +
' Extended Properties=Excel 8.0;' +
' Persist Security Info=False;';
AdoQuery1.Sql.text:='select * from [Sheet1$]';
。
begin
//Form1上还有其他子窗口,这个事件是不会执行的。
end;
begin
if key <> #0 then
label1.Caption :='1111';
end; 改为:procedure TForm1.FormKeyPress(Sender: TObject; var Key: Char);
begin
label1.Caption :='1111';
end;