任务栏显示进度条 CreateComObject(CLSID_TaskbarList) as ITaskbarList4

 http://www.cnblogs.com/jxsoft/archive/2011/06/02/2067712.html

//在任务栏显示 进度条

unit Unit9;
interface
uses
  System.Classes, System.SysUtils, Vcl.Controls, Vcl.Forms, Vcl.StdCtrls,
  Vcl.ExtCtrls, ShlObj;
  //ShellAPI,  ObjectArray, PropSys, ExtCtrls, ImgList, DwmApi;
type
  TForm9 = class(TForm)
    btnProgressbar: TButton;
    tmr1: TTimer;
    edtValue: TEdit;
    btnSetValue: TButton;
    procedure FormCreate(Sender: TObject);
    procedure btnProgressbarClick(Sender: TObject);
    procedure tmr1Timer(Sender: TObject);
    procedure btnSetValueClick(Sender: TObject);
  private
    { Private declarations }
    TBL: ITaskbarList4;
    I: Integer;
  public
    { Public declarations }
  end;
var
  Form9: TForm9;
implementation
uses  ComObj;
//uses ActiveX, ComObj, Math;
{$R *.dfm}
procedure TForm9.btnSetValueClick(Sender: TObject);
begin
  TBL.SetProgressValue(Handle, StrToIntDef(edtValue.Text, 50), 100); //设置值 和最大值
end;
procedure TForm9.btnProgressbarClick(Sender: TObject);
begin
  tmr1.Enabled := not tmr1.Enabled;//定时器 
end;
procedure TForm9.FormCreate(Sender: TObject);
begin
  I := 0;
  TBL := CreateComObject(CLSID_TaskbarList) as ITaskbarList4; //创建对象
  TBL.SetProgressState(Handle, TBPF_NOPROGRESS or TBPF_INDETERMINATE); //初始化
  // or TBPF_INDETERMINATE
end;
procedure TForm9.tmr1Timer(Sender: TObject);
begin
  if I < 100 then
    Inc(I);
  TBL.SetProgressValue(Handle, I, 100);
  if I >= 100 then
  begin
    TBL.SetProgressState(Handle, TBPF_NOPROGRESS);
    tmr1.Enabled := False;
    I := 0;
  end;
end;
end.

object Form9: TForm9
  Left = 0
  Top = 0
  Caption = #20219#21153#26639#26174#31034#36827#24230#26465
  ClientHeight = 166
  ClientWidth = 335
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  OnCreate = FormCreate
  PixelsPerInch = 96
  TextHeight = 13
  object btnProgressbar: TButton
    Left = 40
    Top = 24
    Width = 193
    Height = 33
    Caption = #33258#21160#36827#24230#26465
    TabOrder = 0
    OnClick = btnProgressbarClick
  end
  object edtValue: TEdit
    Left = 40
    Top = 89
    Width = 75
    Height = 21
    ImeName = #20013#25991' ('#31616#20307') - '#25628#29399#25340#38899#36755#20837#27861
    TabOrder = 1
  end
  object btnSetValue: TButton
    Left = 121
    Top = 87
    Width = 112
    Height = 25
    Caption = #25163#21160#35774#23450#36827#24230#20540
    TabOrder = 2
    OnClick = btnSetValueClick
  end
  object tmr1: TTimer
    Enabled = False
    Interval = 40
    OnTimer = tmr1Timer
    Left = 232
    Top = 96
  end
end