Solved

Win32 API question

Posted on 1998-09-05
7
230 Views
Last Modified: 2010-04-06
I have the handle of an application running outside of my delphi 3.0 application. How can I check when that application is finished from inside of my delphi application?
0
Comment
Question by:fh1
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 2
7 Comments
 
LVL 10

Expert Comment

by:viktornet
ID: 1338755
There are many methods to do that and here is one of them,,,,,

In OnTimer()
var
  H : HWND;
begin
  H := FindWindow(nil, 'Untitled - Notepad');
  if H = 0 then
  begin
    ShowMessage('The application has already finished!');
    //Do your code here.....
    Timer1.Enabled := False;//If it's only for once..otherwise don't disable the timer...
  end;
end;

Regards,
Viktor Ivanov

0
 

Author Comment

by:fh1
ID: 1338756
To Viktor Ivanov:
I don't have the name of the window, but I have the handle of it.
0
 
LVL 10

Expert Comment

by:viktornet
ID: 1338757
Here is the second method and more official, with a little more code....
Params -
   Filename - the filename of the app to execute and wait for.....
    Visibility - SW_SHOW, SW_HIDE, SW_SHOWNORMAL........
--------------
How do I execute a program and have my code wait until it is finished?

function WinExecAndWait32(FileName:String; Visibility : integer):integer;
var
  zAppName:array[0..512] of char;
  zCurDir:array[0..255] of char;
  WorkDir:String;
  StartupInfo:TStartupInfo;
  ProcessInfo:TProcessInformation;
begin
  StrPCopy(zAppName,FileName);
  GetDir(0,WorkDir);
  StrPCopy(zCurDir,WorkDir);
  FillChar(StartupInfo,Sizeof(StartupInfo),#0);
  StartupInfo.cb := Sizeof(StartupInfo);

  StartupInfo.dwFlags := STARTF_USESHOWWINDOW;
  StartupInfo.wShowWindow := Visibility;
  if not CreateProcess(nil,
    zAppName,                      { pointer to command line string }
    nil,                           { pointer to process security attributes }
    nil,                           { pointer to thread security attributes }
    false,                         { handle inheritance flag }
    CREATE_NEW_CONSOLE or          { creation flags }
    NORMAL_PRIORITY_CLASS,
    nil,                           { pointer to new environment block }
    nil,                           { pointer to current directory name }
    StartupInfo,                   { pointer to STARTUPINFO }
    ProcessInfo) then Result := -1 { pointer to PROCESS_INF }

  else begin
    WaitforSingleObject(ProcessInfo.hProcess,INFINITE);
    GetExitCodeProcess(ProcessInfo.hProcess,Result);
  end;
end;
------------
Regards,
Viktor Ivanov
0
[Live Webinar] The Cloud Skills Gap

As Cloud technologies come of age, business leaders grapple with the impact it has on their team's skills and the gap associated with the use of a cloud platform.

Join experts from 451 Research and Concerto Cloud Services on July 27th where we will examine fact and fiction.

 
LVL 10

Expert Comment

by:viktornet
ID: 1338758
If you want use the method I just gave otherwise if you want to use the first method here is how if you have the handle.....

var
  H : HWND;
begin
  H := //the handle you already know of your application.....
  if H = 0 then
  begin
    ShowMessage('The app is already running');
    //Do you job here.....
  end;
end;
0
 
LVL 10

Expert Comment

by:viktornet
ID: 1338759
oopssss....see the line that says ShowMessage('The app is already running');...this is suppose to be ShowMessage('The app is already finished');
sorry for the wrong code ;)

Regards,
Viktor Ivanov
0
 

Author Comment

by:fh1
ID: 1338760
Since I only know the handle of the window, I have to find the name of the window and then check in a loop if the handle of this window become zero.
0
 
LVL 10

Accepted Solution

by:
viktornet earned 50 total points
ID: 1338761
That's not true...You don't need the name if you know the handle. Just use the method I told you and that's all...

Regards,
Viktor Ivanov
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Ready to improve network connectivity? Watch this webinar to learn how SD-WANs and a one-click instant connect tool can boost provisions, deployment, and management of your cloud connection.

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…
In this tutorial I will show you how to use the Windows Speech API in Delphi. I will only cover basic functions such as text to speech and controlling the speed of the speech. SAPI Installation First you need to install the SAPI type library, th…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.
Suggested Courses
Course of the Month7 days, 1 hour left to enroll

622 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