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Capturing dos output

Posted on 1998-12-04
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Last Modified: 2010-04-04
I've got a dos program that outputs some text. Is there any way to run the program and capture that output within my delphi program?
Preferbly so that the user doesn't se the program running.
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Question by:PsychoFox
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LVL 20

Accepted Solution

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Madshi earned 100 total points
ID: 1349313
Try this one:

"unit runThread_;

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 copy 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 copy...';
  ZeroMemory(@si,sizeOf(si)); si.cb:=sizeOf(si);
  si.dwFlags:=STARTF_USESHOWWINDOW; si.wShowWindow:=SW_HIDE;
  if CreateProcess(nil,'c:\command.com /c copy c:\autoexec.bat c:\test.bat >c:\output.txt',nil,nil,false,0,nil,nil,si,pi) then begin
    caption:='copy 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 copy...';
        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:='copy stopped...';
      finally Free end;
    CloseHandle(pi.hThread); CloseHandle(pi.hProcess); // Never forget to close handles...
    caption:='ready...';
  end else caption:='could not start copy...';
end;

end."

It starts the dos copy in hidden state, captures the output to "c:\output.txt" and waits until copy has finished.

Regards, Madshi.
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