shaboutf.pas

Delphi实效编程百例的随书源代码 这是其中的程序控制部分

unit ShAboutF;

interface

uses Windows, Classes,Messages, Graphics,Dialogs, Forms,
  Controls, StdCtrls, SysUtils, ShellApi;
const MY_MESSAGE = WM_USER + 100;

type
  TForm1 = class(TForm)
    Button1: TButton;
    memo1: TMemo;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private

    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  hCurrentWindow:HWnd;
  szText:array[0..254] of char;
begin
  hCurrentWindow := GetWindow(Handle, GW_HWNDFIRST);
  while hCurrentWindow <> 0 do
  begin
  if GetWindowText(hCurrentWindow, @szText, 255)>0 then
  Memo1.Lines.Add(StrPas(@szText));
  hCurrentWindow:=GetWindow(hCurrentWindow, GW_HWNDNEXT);
  end;
end;


procedure TForm1.FormCreate(Sender: TObject);
var 
  nid: TNotifyIconData;
begin
  nid.cbSize := sizeof(nid); // nid变量的字节数
  nid.Wnd := Handle; // 主窗口句柄
  nid.uID := 1; // 内部标识，可设为任意数
  nid.hIcon := Application.Icon.Handle; // 要加入的图标句柄，可任意指
  nid.hIcon := Application.Icon.Handle; // 要加入的图标句柄，可任意指

  nid.szTip := 'This is a test application'; // 提示字符串
  nid.uCallbackMessage := MY_MESSAGE; // 回调函数消息
  nid.uFlags := NIF_ICON or NIF_TIP or NIF_MESSAGE; // 指明哪些字段有
  if not Shell_NotifyIcon(NIM_ADD, @nid) then
  begin
    showmessage('failed');
    Application.Terminate;
  end;
  {将程序的窗口样式设为TOOL窗口，可避免在任务条上出现}
  SetWindowLong(Application.Handle, GWL_EXSTYLE, WS_EX_TOOLWINDOW);
end; 


procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
var 
  nid: TNotifyIconData;
begin
  nid.cbSize := sizeof(nid); // nid变量的字节数
  nid.uID := 1; //内部标识，与加入小图标时的数一致
  nid.Wnd := Handle; //主窗口句柄
  Shell_NotifyIcon(NIM_DELETE, @nid); //去掉小图标
  Shell_NotifyIcon(NIM_DELETE, @nid); //去掉小图标
end;


end.