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ShellExecute-Running app.

Posted on 1998-08-17
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Last Modified: 2010-04-04

I want to start an application from my Delphi app.To do that there are some API fucntions,(ShellExecute, ShellExecuteEx.)
the problem is that when I use the ShellExecuteEx, by using
WaitForSingleObject i can know that whether the launched app is terminated or not.(Because ShellExecuteEx give the handle of the application and a flag value which is SEE_MASKNOCLOSEPROCESS so that you can be informed when the app. is terminated).
  But ShellExecuteEx cannot be used in WINNT and my app must run on NT.
(In ShellExecute(which can be used on NT also.) there is no flag like SEE_MASKNOCLOSEPROCESS so you cannot call the WaitForSingleObject to understand the termination.)


Any help,

Later...
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Question by:ms99y
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19 Comments
 

Author Comment

by:ms99y
Comment Utility

By the way, Does anybody know how to search the answers and questions in this site for a specific subject..

(There are lots of questions and given answers but how to search ???)

ms99y
Later
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LVL 10

Expert Comment

by:viktornet
Comment Utility
Hello ms99y...

Here is a funtion that will do it...
Function WinExecAndWait(Path : string; Visibility : word) : word;

var

  InstanceID : THandle;

  PathLen : integer;

begin

  { inplace conversion of a String to a PChar }

  PathLen := Length(Path);

  Move(Path[1],Path[0],PathLen);

  Path[PathLen] := #0;

  { Try to run the application }

  InstanceID := WinExec(@Path,Visibility);

  if InstanceID < 32 then { a value less than 32 indicates an Exec error }

     WinExecAndWait := InstanceID

  else

  begin

    Repeat

      Application.ProcessMessages;

    until Application.Terminated or (GetModuleUsage(InstanceID) = 0);

    WinExecAndWait := 32;

  end;

end;

Hope this is what you need
//Viktor Ivanov
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Expert Comment

by:vladika
Comment Utility
Try to use CreateProcess function
In the last parameter it return handles of process and primary thread

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LVL 10

Expert Comment

by:viktornet
Comment Utility
Param :
  Visibility : SW_NORMAL, SW_HIDE, ........

Example call : WinExecAndWait('C:\Windows\desktop\cool.exe',SW_NORMAL);

You can remove the WinExec procedure ,and enter ShellExec instead. That would be better I think...

//Viktor Ivanov
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Author Comment

by:ms99y
Comment Utility

I will try your suggestions
  Thanx much

0
 

Author Comment

by:ms99y
Comment Utility

I will try your suggestions
  Thanx much

0
 
LVL 10

Expert Comment

by:viktornet
Comment Utility
If WinExec try to use ShellExec like this....
Don't forget to include the ShellAPI in the uses clause

Instead of having this line from the code I gave you before...
    InstanceID := WinExec(@Path,Visibility);
.use this one ....

InstanceID := ShellExec(0, 'open',PChar(Path),nil,nil, Visibility);

You can also have @Path instead of PChar(Path)... the way you prefer...
Hope this helps...

//Viktor Ivanov
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LVL 10

Expert Comment

by:viktornet
Comment Utility
I meant if WinExec doesn't work then try to use ShellExec

//Vik
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Author Comment

by:ms99y
Comment Utility
Hi Vect,


  In your code you make a call to GetModuleUsage WINAPI function wh,ch is obsolete and deleted. I will examine the CreateProcess  which  vladika suggested.


Later,
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LVL 8

Expert Comment

by:ZifNab
Comment Utility
ms99y,

Last 2 weeks, this Q'n is already answered several times :

PS. Don't use WinExec in 32bit programs! It's there for backworth compatability. Use CreateProcess instead!

Here is one of mine :

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, ointer to STARTUPINFO }
    ProcessInfo) then Result := -1 { pointer to PROCESS_INF }
  else begin
    WaitforSingleObject(ProcessInfo.hProcess,INFINITE);
    GetExitCodeProcess(ProcessInfo.hProcess,Result);
  end;
end;

And here I refer to another, still open Q'n (although not really a Q'n, it's an answer on q'n which are frequently asked):

http://www.experts-exchange.com/topics/comp/lang/delphi/Q.10071798

About search : YES! It was needed! And NOW there IS a search engine, a small one, but heck it's good enough for now.
---> The home-page of E-E has now a search capability.

Regards, Zif.
0
 
LVL 4

Expert Comment

by:erajoj
Comment Utility
What the ... are you talking about? :-)
ShellExecuteEx works in NT! (just tested it)

See Q.10071798 for an implementation.

/// John
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LVL 8

Expert Comment

by:ZifNab
Comment Utility
erajoj,

what the ... am I talking about :

1. They were talking of WinExec
2. Then about CreateProcess
3. My comment : gave example of Createprocess
                AND refered to your question-example : see comment! for ShellExecute
4. Think all is said.

Zif.
0
 
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Expert Comment

by:erajoj
Comment Utility
Hi Zif,
Not talking to you, talking to ms99y.
Don't believe everything the helpfiles say...

/// John
0
 
LVL 20

Expert Comment

by:Madshi
Comment Utility
erajoj,

my helpfile says, ShellExecuteEx DOES RUN with WinNT. Your helpfile must be an old version...    :-)

Madshi.
0
 

Author Comment

by:ms99y
Comment Utility
Hi erajoj,

  In my help file it is saying that ShellExecuteEx does not run on NT. (But anyway I can make test..)

To Zif,
  I will try your code and Thanx.
0
 

Author Comment

by:ms99y
Comment Utility
Hi erajoj,

  In my help file it is saying that ShellExecuteEx does not run on NT. (But anyway I can make test..)

To Zif,
  I will try your code and Thanx.
0
 

Author Comment

by:ms99y
Comment Utility
Hi, Viktor instead of using WinExec it seems that using CreateProcess is more logical way.

Zif ,
thanks for your help, please send your comment as an answer

Later
0
 
LVL 1

Expert Comment

by:nrobin
Comment Utility
procedure TForm1.Run (const Name: string);
var
      si   :TStartupInfo;
      pif  :TProcessInformation;
      ecp  :DWORD;
      Running:boolean;
      Path: Array [0..255] of char;
      ErrorCode: Integer;

begin
       FbWECreated := FALSE;
       SetCurrentDir (ExtractFilePath (name));

       ZeroMemory (@si, sizeof (TStartupInfo));
       si.cb := sizeof (TStartupInfo);
       si.lpTitle := StrAlloc (100);
       StrPCopy (si.lpTitle, 'Compiling the ' + eProject.Text + ' project...');
       si.dwFlags := STARTF_USESHOWWINDOW;
       si.wShowWindow := SW_MAXIMIZE;

       if CreateProcess (nil, PChar (Name), nil, nil, FALSE, NORMAL_PRIORITY_CLASS, nil, nil, si, pif) then
   begin
             RE.Lines.Add ('');
             RE.Lines.Add ('Executing compiler...');

     WaitForInputIdle (THandle (pif.hProcess), 10000);
     Running := TRUE;

      while Running do
      begin
        Application.ProcessMessages;
        GetExitCodeProcess (THandle (pif.hProcess), ecp);
        if ecp <> STILL_ACTIVE then
                              Running := false;

        Sleep (250);
                  end;

      if cbExecuteOutput.Checked then
      begin
        StrPCopy (path, eOutputFile.Text);
        ErrorCode := ShellExecute(Application.Handle, 'open', Path, '', '', SW_SHOW);
                  end;
                  LoadFile (TRUE);
             end
   else
end;

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LVL 8

Accepted Solution

by:
ZifNab earned 90 total points
Comment Utility

Hi ms99y,

Glad it work for you!

PS. Don't use WinExec in 32bit programs! It's there for backworth compatability. Use CreateProcess instead!

       Here is one of mine :

       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, ointer to STARTUPINFO }
           ProcessInfo) then Result := -1 { pointer to PROCESS_INF }
         else begin
           WaitforSingleObject(ProcessInfo.hProcess,INFINITE);
           GetExitCodeProcess(ProcessInfo.hProcess,Result);
         end;
       end;

       And here I refer to another, still open Q'n (although not really a Q'n, it's an answer on q'n which are frequently asked):

       http://www.experts-exchange.com/topics/comp/lang/delphi/Q.10071798

       About search : YES! It was needed! And NOW there IS a search engine, a small one, but heck it's good enough for now.
       ---> The home-page of E-E has now a search capability.

Regards, Zif.

Have fun.
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