unit1.~pas

根据键盘消息获取按键名称的方法.属于消息截取.

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure MyMsg(var msg: TWMKeyDown); message WM_KEYDOWN;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Canvas.Font.Size := 24;
  Canvas.Font.Style := [fsBold];
  Canvas.Font.Color := clRed;
  Canvas.Brush.Color := clWhite;

end;

procedure TForm1.MyMsg(var msg: TWMKeyDown);
var
  buf: array[0..31] of Char;
  rect: TRect;
  str: string;
begin
  {获取}
  GetKeyNameText(msg.KeyData, buf, Length(buf));
  {画出来}
  str := buf;

  //Label1.Caption:=str;
  ShowMessage(str);

  rect := ClientRect;
  Canvas.FillRect(rect);
  Canvas.TextRect(rect,100,100, str);
  //Canvas.TextRect(rect, str, [tfSingleLine, tfCenter, tfVerticalCenter]);
  inherited;
end;

end.