检测Insert、Capslock、NumLock、ScrollLock状态键的状态

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, AppEvnts, ComCtrls;

type
  TForm1 = class(TForm)
    StatusBar1: TStatusBar;
    ApplicationEvents1: TApplicationEvents;
    procedure FormResize(Sender: TObject);
    procedure ApplicationEvents1Message(var Msg: tagMSG;
      var Handled: Boolean);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormResize(Sender: TObject);
begin
    with StatusBar1 do
    begin
        Panels[0].Width:=Form1.Width - Panels[1].Width -Panels[2].Width-Panels[3].Width -50;
    end;
end;

procedure TForm1.ApplicationEvents1Message(var Msg: tagMSG;
  var Handled: Boolean);
begin
    if GetKeyState(VK_CAPITAL) <> 0 then
      StatusBar1.Panels[1].Text := ' CAP'
    else
      StatusBar1.Panels[1].text:='';

    if GetKeyState(VK_NUMLOCK) <> 0 then
      StatusBar1.Panels[2].Text := ' NUM'
    else
      StatusBar1.Panels[2].Text := '';

    if GetKeyState(VK_SCROLL) <> 0 then
      StatusBar1.Panels[3].Text := ' SCRL'
    else
      StatusBar1.Panels[3].Text := '';
End;

end.

---

可以调用Win API的Getkeyboardstate()函数。
    常量        按键名称
VK_INSERTI    nsert键
VK_NUMLOCK    Num Lock键
VK_CAPITAL    Caps Lock键
VK_SCROLL     Scroll Lock键
  键盘缓冲区每一位都有一位特定的格式，对于状态键来说，最低位是1时表示状态键处于ON状态，你可以使用odd()函数来确定这一位的状态，以下是一个简单的例子请参考。例子中放置一个Timer控件、一个StayusBar1状态条。

unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ExtCtrls, ComCtrls;
type
TForm1 = class(TForm)
StatusBar1: TStatusBar;
Timer1: TTimer;
procedure Timer1Timer(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Timer1Timer(Sender: TObject);
var ks:tkeyboardstate;
begin
  getkeyboardstate(ks);//检测键盘函数
  if odd(ks[VK_NUMLOCK]) then
    statusbar1.panels.items[0].text:='NUM'
  else
    statusbar1.panels.items[0].text:='';
  if odd(ks[VK_INSERT]) then
    statusbar1.panels.items[1].text:='INSERT'
  else
    statusbar1.panels.items[1].text:='';
  if odd(ks[VK_CAPITAL]) then
    statusbar1.panels.items[2].text:='CAPITAL'
  else
    statusbar1.panels.items[2].text:='' ;
  if odd(ks[VK_SCROLL]) then
    statusbar1.panels.items[3].text:='SCROLL'
  else
    statusbar1.panels.items[3].text:='';
  end;
end.

来自为知笔记(Wiz)

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