動態給外部程序加一個按紐 (2001年3月15日) 

網友更新  分類:Win API   作者:閻磊  推薦:yanlei   閱讀次數:357  
(http://www.codesky.net)  

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啟動計算器,給計算器加一個按鈕
unit Unit1;

interface

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

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;
proc : longint;
form_hw,hn:HWND;
implementation
{$R *.DFM}
function WndProc2(hwnd: HWnd; Msg: UINT; wParam: wParam;
lParam: LPARAM) : integer; Far; stdcall;
begin
CASE Msg OF
WM_LBUTTONUP:
begin
showmessage('ok');
end

END;

Result := CallWindowProc(TFNWndProc(proc), hwnd, Msg, wParam, lParam);
end;

procedure TForm1.Button1Click(Sender: TObject);
var l:longint;
rcw : Word;
begin
rcw := WinExec('calc.exe', SW_SHOWNORMAL);//啟動計算器
if rcw<=32 then //無法啟動計算器
begin
Application.Terminate;
end ;

while true do//確保計算器啟動
begin
form_hw:=FindWindow(nil,'計算器');
if boolean(form_hw) then break;
end;

hn := CreateWindow('BUTTON', 'ok',
WS_VISIBLE + WS_CHILD, 0, 0, 30, 20,form_hw
, 0, 0, nil);//left=0,top=0,width=30 height=20
proc := GetWindowLong(hn, GWL_WNDPROC);
l := longint(@WndProc2);//設定事件
SetWindowLong(hn, GWL_WNDPROC, l);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
if boolean(form_hw) then//啟動
SendMessage(form_hw, wm_close,0,0);
end;

end.