views:

1216

answers:

3

How do I read a console apps output as it is running. I start the console application and would like to read the output as it is printed by the console app.

+7  A: 

What about this solution.


EDIT: the link leads to this solution (lightly refactored for legibility and to remove use of with):

// The example runs 'chkdsk.exe c:\' and displays the output to Memo1.
// Put a TMemo (Memo1) and a TButton (Button1) on your form. Put this 
//   code in the OnCLick event procedure for Button1:

procedure TForm1.RunDosInMemo(DosApp:String;AMemo:TMemo) ;
const
  ReadBuffer = 2400;
var
  Security    : TSecurityAttributes;
  ReadPipe,
  WritePipe   : THandle;
  start       : TStartUpInfo;
  ProcessInfo : TProcessInformation;
  Buffer      : Pchar;
  BytesRead   : DWord;
  Apprunning  : DWord;

begin
  Security.nlength := SizeOf(TSecurityAttributes) ;
  Security.binherithandle := true;
  Security.lpsecuritydescriptor := nil;
  if Createpipe (ReadPipe, WritePipe, @Security, 0) then 
  begin
    Buffer := AllocMem(ReadBuffer + 1) ;
    FillChar(Start,Sizeof(Start),#0) ;
    start.cb := SizeOf(start) ;
    start.hStdOutput := WritePipe;
    start.hStdInput := ReadPipe;
    start.dwFlags := STARTF_USESTDHANDLES + STARTF_USESHOWWINDOW;
    start.wShowWindow := SW_HIDE;
    if CreateProcess(nil,
                     PChar(DosApp),
                     @Security,
                     @Security,
                     true,
                     NORMAL_PRIORITY_CLASS,
                     nil,
                     nil,
                     start,
                     ProcessInfo) then
    begin
      repeat
        Apprunning := WaitForSingleObject(ProcessInfo.hProcess,100);
        Application.ProcessMessages;
      until (Apprunning <> WAIT_TIMEOUT) ;
      repeat
        BytesRead := 0;
        ReadFile(ReadPipe,Buffer[0],
        ReadBuffer,BytesRead,nil) ;
        Buffer[BytesRead]:= #0;
        OemToAnsi(Buffer,Buffer) ;
        AMemo.Text := AMemo.text + String(Buffer) ;
      until (BytesRead < ReadBuffer) ;
    end;
    FreeMem(Buffer) ;
    CloseHandle(ProcessInfo.hProcess) ;
    CloseHandle(ProcessInfo.hThread) ;
    CloseHandle(ReadPipe) ;
    CloseHandle(WritePipe) ;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject) ;
begin
  RunDosInMemo('chkdsk.exe c:\', Memo1) ;
end;
ErvinS
nice suggestion for those who follow the link, but a link alone is not a really good answer, see: http://meta.stackoverflow.com/questions/8231/are-answers-that-just-contain-links-elsewhere-really-good-answers
Argalatyr
I posted the code from the link.
Mick
@Mick: oops - while you were doing that in a new answer, I was editing the old one. If someone feels my edit should be rolled back, feel free to do so.
Argalatyr
No worries. I deleted my comment then.
Mick
@Argalatyr: ok thanks, i will include code in the future.
ErvinS
This does not read the output as it comes, it only reads everything right at the end ... that is not what i am looking for.
Shame it's not quite what you're looking for, but this code is what I was looking for, thanks none the less.
Robo
A: 

You can always just run the application from the command prompt.

Frank Shearar
He wants to read the console output in-process. So redirecting the output using CreatePipe is the solution
Scoregraphic
A: 

I usually use this ported FPC code: http://www.stack.nl/~marcov/processdelphi.zip

It contains a class to control external programs (it is the class used by Lazarus to call the cmdline compiler and other programs).

Documentation is here, but the delphi port is a bit old, so not all documented properties might exist in the above version.

http://www.freepascal.org/docs-html/fcl/process/index.html

Marco van de Voort