unit uflash;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls;
const//定義常量

  WS_EX_LAYERED = $80000;

  AC_SRC_OVER = $0;

  AC_SRC_ALPHA = $1;

  AC_SRC_NO_PREMULT_ALPHA = $1;

  AC_SRC_NO_ALPHA = $2;

  AC_DST_NO_PREMULT_ALPHA = $10;

  AC_DST_NO_ALPHA = $20;

  LWA_COLORKEY = $1;

  LWA_ALPHA = $2;

  ULW_COLORKEY = $1;

  ULW_ALPHA = $2;

  ULW_OPAQUE = $4;
type
  Tfrmflash = class(TForm)
    Image1: TImage;
    Label1: TLabel;
    Timer1: TTimer;
    procedure FormCreate(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
        i:integer;
  public
    { Public declarations }
  end;
  function SetLayeredWindowAttributes(hwnd:HWND; crKey:Longint; bAlpha:byte; dwFlags:longint ):longint; stdcall; external user32;//函數(shù)聲明
var
  frmflash: Tfrmflash;

implementation

{$R *.dfm}

procedure Tfrmflash.FormCreate(Sender: TObject);
var l:longint;

begin
    Label1.Caption:='正在連接數(shù)據(jù)庫(kù).....　　　　　　　　　　　　　';
  l:=getWindowLong(Handle, GWL_EXSTYLE);

  l := l Or WS_EX_LAYERED;

  SetWindowLong (handle, GWL_EXSTYLE, l);
  i:=250;


//第二個(gè)參數(shù)是指定透明顏色

//第二個(gè)參數(shù)為0則使用第四個(gè)參數(shù)設(shè)置alpha值，從0到255
end;

procedure Tfrmflash.Timer1Timer(Sender: TObject);
begin
 if i<=50 then
 begin
    close;
 end;
 if i=200 then
  begin
  Label1.Caption:='正在加載數(shù)據(jù)模塊.....　　　　　　　　　　　　　';
  end;
  if i=100 then
  begin
  Label1.Caption:='正在初始化系統(tǒng).....　　　　　　　　　　　　　';
  end;
 i:=i-10;
  SetLayeredWindowAttributes (handle, 0, i, LWA_ALPHA);
end;

end.