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Detect program execution.

Posted on 1998-12-19
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Last Modified: 2010-04-04
Hi all,

I want that the program execution stop when I launch one application using WinExec/CreateProcess/ShellExecute or another one and continue when the application that I launched close.
begin
   WinExec('App.exe', sw_normal); //open the app and wait
   // When App.exe close;
   MessageDlg('App stoped.', mtInformation,[mbOk], 0);
end;

Another solution is launch the app and track the finalization using API but I don't know the correct function.

Hope to be clear.
Regards
Paulo
   

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Question by:sergio_2001
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1 Comment
 
LVL 20

Accepted Solution

by:
Madshi earned 50 total points
ID: 1352038
Paulo,

hope this helps...

unit Unit1;

interface

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

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

var
  Form1: TForm1;

implementation

{$R *.DFM}

type TRunThread = class(TThread)
  private
    processHandle : cardinal;
    processReady  : boolean;
    waitingThread : cardinal;
    procedure Execute; override;
  end;

procedure TRunThread.Execute;
begin
  WaitForSingleObject(processHandle,INFINITE);   // This call does not return, unless notepad is stopped
  processReady:=true;                            // Set "processReady" flag for main thread
  PostThreadMessage(waitingThread,WM_NULL,0,0);  // Wake up main thread
                                                 // If you call Application.HandleMessage (see below) in the
                                                 // main thread, the main thread is sleeping the most time in
                                                 // winAPI "waitMessage". So we send a "dummy" message in order
                                                 // to let the main thread return from Application.HandleMessage
end;

procedure TForm1.Button1Click(Sender: TObject);
var si : TStartupInfo;
    pi : TProcessInformation;
begin
  caption:='start notepad...';
  ZeroMemory(@si,sizeOf(si)); si.cb:=sizeOf(si);
  if CreateProcess(nil,'c:\windows\notepad.exe',nil,nil,false,0,nil,nil,si,pi) then begin
    caption:='notepad started...';
    with TRunThread.Create(true) do         // create the thread object, but do not start it now...
      try
        processHandle:=pi.hProcess;         // tell the thread what process it has to watch
        processReady:=false;                // flag for the loop (see below)
        waitingThread:=GetCurrentThreadID;  // the current threadID for the wakeup message (see above)
        caption:='wait for notepad...';
        Resume;                             // now all information is prepared; so let's start the thread
        repeat
          Application.HandleMessage;        // message loop
        until Application.Terminated or processReady;  // continue with normal program when either the
                                                       // started process has stopped or our program is closed
        caption:='notepad stopped...';
      finally Free end;
    CloseHandle(pi.hThread); CloseHandle(pi.hProcess); // Never forget to close handles...
    caption:='ready...';
  end else caption:='could not start notepad...';
end;

end.

Regards, Madshi.
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