How use CreateProcess?

Hi!

I've been skimming through the Online-reference for CreateProcess, but it seems somewhat confusing.
Your mission if you choose to accept it:

Show me how I use CreateProcess to run an application (with command line parameters, no other fancy stuff) within my Delphi code just as if I double-clicked it in a file-window, and show me how to make the parent process halt until the child process is finished and terminates. Or does the parent process halt automatically??

Thanks, folks!

//Daniel, Sweden
DippenAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

ronit051397Commented:
0
ronit051397Commented:
You want to know also when the process dies?
0
ronit051397Commented:
The parent application does not wait. In order to let it wait until the process dies, you need to call WaitforSingleObject.

The following function comes from http://www.chami.com/tips/delphi/122096D.html .
I just added the WaitforSingleObject line, in order to stop the parent application from continuing as long as the process live.
If you click the button, then the message will be shown only when the notepad is closed.

function CreateProcessSimple( sExecutableFilePath : string ) : String;
var
  pi: TProcessInformation;
  si: TStartupInfo;
begin
  FillMemory( @si, sizeof( si ), 0 );
  si.cb := sizeof( si );
  CreateProcess(
                Nil, PChar( sExecutableFilePath ), Nil, Nil,                                 False, NORMAL_PRIORITY_CLASS, Nil, Nil, si, pi );
  WaitforSingleObject(pi.hProcess, INFINITE);//wait until the process terminates
  CloseHandle( pi.hProcess );
  CloseHandle( pi.hThread );
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  CreateProcessSimple( 'notepad' );
  showmessage('The Process is DEAD');
end;

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
DippenAuthor Commented:
Thanks, Ronit! I'll try the code later and grade your answer accordingly. But now I've got to go put my pillow in my face...

0
DippenAuthor Commented:
Worked perfectly except for one minor thing: The procedure doesn't seem to accept long filenames... I thought CreateProcess was a Win32-command. But as I said, besides that it worked perfectly. Thanks, Ronit!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Delphi

From novice to tech pro — start learning today.