Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Detect program execution.

Posted on 1998-12-19
1
Medium Priority
?
160 Views
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
   

0
Comment
Question by:sergio_2001
1 Comment
 
LVL 20

Accepted Solution

by:
Madshi earned 150 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.
0

Featured Post

How to Use the Help Bell

Need to boost the visibility of your question for solutions? Use the Experts Exchange Help Bell to confirm priority levels and contact subject-matter experts for question attention.  Check out this how-to article for more information.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Want to learn how to record your desktop screen without having to use an outside camera. Click on this video and learn how to use the cool google extension called "Screencastify"! Step 1: Open a new google tab Step 2: Go to the left hand upper corn…
In a question here at Experts Exchange (https://www.experts-exchange.com/questions/29062564/Adobe-acrobat-reader-DC.html), a member asked how to create a signature in Adobe Acrobat Reader DC (the free Reader product, not the paid, full Acrobat produ…
Suggested Courses

971 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question