With CreateProcess() it output to file instead output to crt like first

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C++

Hi~
1. From Cmd.exe mode, if I hit sort
c
b
a
^Z
c
b
a

a
b
c

2. if I hit sort >> test.txt
c
b
a
^Z

3. but then if I hit sort
c
b
a
^Z

doesn't output to crt
c
b
a

a
b
c

why?

else if( !_tcscmp(cmdTokenList[0], _T("sort")) )
{
    if(!_tcscmp(cmdTokenList[1], _T(">>")) )
    {
         SECURITY_ATTRIBUTES fileSec = {
       //    sizeof(SECURITY_ATTRIBUTES), NULL, FALSE
             sizeof(SECURITY_ATTRIBUTES), NULL, TRUE
          };

       // Save the handle to the current STDOUT. 
          HANDLE hSaveStdout = GetStdHandle(STD_OUTPUT_HANDLE); 

          HANDLE hFile = CreateFile ( 
           // cmdTokenList[2], GENERIC_WRITE, 0,
           // cmdTokenList[2], GENERIC_WRITE, FILE_SHARE_READ,
              cmdTokenList[2], GENERIC_WRITE, FILE_SHARE_WRITE,
              &fileSec, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL,
              NULL);

       // Create noninheritable read handle and close the inheritable read 
       // handle. 
          HANDLE hFileDup;
          if( !DuplicateHandle(GetCurrentProcess(), hFile,
              GetCurrentProcess(), &hFileDup , 0,
              FALSE,
              DUPLICATE_SAME_ACCESS))
              ErrorExit(_T("DuplicateHandle failed"));
          CloseHandle(hFile);
          si.hStdOutput = hFileDup;
     //   si.hStdOutput = hFile;
          si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
          si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
          si.dwFlags |= STARTF_USESTDHANDLES;

     //   isRun = CreateProcess(NULL, cmdTokenList[0], NULL, NULL, FALSE, 0, NULL, NULL,
        //    &si, &pi);
            isRun = CreateProcess(NULL, cmdTokenList[0], NULL, NULL, TRUE, 0, NULL, NULL,
              &si, &pi);

       // After process creation, restore the saved STDIN and STDOUT. 
          if (! SetStdHandle(STD_OUTPUT_HANDLE, hSaveStdout)) 
              ErrorExit(_T("Re-redirecting Stdout failed\n")); 
          WaitForSingleObject(pi.hProcess, INFINITE);
          CloseHandle(hFile);
      }
      else
      {
          si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
     //   isRun = CreateProcess(NULL, cmdTokenList[0], NULL, NULL, TRUE, 0, NULL, NULL,
     //       &si,&pi);
          isRun = CreateProcess(NULL, cmdTokenList[0], NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);
          WaitForSingleObject(pi.hProcess, INFINITE);
       }

   //  CloseHandle(si.hStdOutput);
        CloseHandle(pi.hProcess);
       CloseHandle(pi.hThread);
   //  CloseHandle(si.hStdInput);
        SetStdHandle(STD_OUTPUT_HANDLE, hStdout);
       SetStdHandle(STD_INPUT_HANDLE, hStdin);

}

thanks for reading.