Получить выходные данные DOS приложения

{----------------------------CreateDOSProcessRedirected--------------------------- 
 Description    : executes a (DOS!) app defined in the CommandLine parameter redirected 
                  to take input from InputFile and give output to OutputFile 
 Result         : True on success 
 Parameters     : 
                  CommandLine : the command line for the app, including its full path 
                  InputFile   : the ascii file where from the app takes input 
                  OutputFile  : the ascii file to which the app's output is redirected 
                  ErrMsg      : additional error message string. Can be empty 
 Error checking : YES 
 Target         : Delphi 2, 3, 4 
 Author         : Theodoros Bebekis, email bebekis@otenet.gr 
 Notes          : 
 Example call   : CreateDOSProcessRedirected('C:MyDOSApp.exe', 
                                             'C:InputPut.txt', 
                                             'C:OutPut.txt', 
                                             'Please, record this message') 
-----------------------------------------------------------------------------------}

 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
;

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