sendnotifymessagegetu.pas

DelphiWin32核心API参考光盘内容.是学习书籍中的源码,便于学习.

unit SendNotifyMessageGetU;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    ProgressBar1: TProgressBar;
    Label2: TLabel;
  private
    { Private declarations }
  public
    { Public declarations }
    procedure WMClear(var Msg: TWMClear); message WM_CLEAR;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

{we override the WM_CLEAR message handler to do
 something special when received}
procedure TForm1.WMClear(var Msg: TWMClear);
var
  iLoop: Integer;   // general loop control variable
begin
    {turn on some user interface objects}
    ProgressBar1.Visible := TRUE;
    Label2.Visible := TRUE;
    Form1.Repaint;

    {animate the progress bar for a short time}
    for iLoop := 0 to 100 do
    begin
      ProgressBar1.Position := iLoop;
      Sleep(10);
    end;

    {turn off the user interface objects}
    ProgressBar1.Visible := FALSE;
    Label2.Visible := FALSE;

    {indicate that the message was processed}
    Msg.Result := 1;
end;



end.