Windows Anonymous pipeline reads sub-process output

      // Prepare pipe handles for standard output redirection
      Security_attributes saattr;
      // Set the binherithandle flag so pipe handles are inherited.
      Saattr. nlength = sizeof (security_attributes );
      Saattr. binherithandle = true;
      Saattr. lpsecuritydescriptor = NULL;
      Handle hreadpipe, hwritepipe;
      Bool res = createpipe (& hreadpipe, & hwritepipe, & saattr, 0 );
      If (! Sethandleinformation (hreadpipe, handle_flag_inherit, 0 ))
      {
          Log (error <"sethandleinfomation fail .");
      }

      String stroutfile;
      If (! Res)
      {
          Return res;
      }
      Else
      {
          Startupinfo Si;
          Memset (& Si, 0, sizeof (SI ));
          Si. cb = sizeof (SI );
          Getstartupinfo (& Si );
          // Hide DOS window
          Si. dwflags = startf_useshowwindow;
          Si. wshowwindow = sw_hide;
          Si. dwflags = startf_useshowwindow | startf_usestdhandles;
          Si. hstdoutput = hwritepipe;
          Si. hstdinput = hreadpipe;
          Si. hstderror = hwritepipe;
          Process_information PI;
          Zeromemory (& Pi, sizeof (process_information ));

          Wstring sfullcommand = l "WMIC diskdrive list ";
          Res = CreateProcess (null, (lptstr) (lpctstr) sfullcommand. c_str (), null, null, true,
              0, null, null, & Si, & PI );
          If (! Res)
          {
              // Process error of RSH
              Log (error <"CreateProcess fail .");
              Return err_error;
          }
          Else
          {
              // Close write Pipe
              Closehandle (hwritepipe );
              DWORD numberofbytesread;
              Char buffer [257];
              While (: readfile (hreadpipe, buffer, sizeof (buffer)/sizeof (buffer [0])-1,
                  & Numberofbytesread, null ))
              {
                  Log (info <buffer <"numberofbytesread:" <numberofbytesread );
                  If (numberofbytesread)
                  {
                      Buffer [numberofbytesread] = tchar (0 );
                      Stroutfile + = buffer;
                  }
                  Else
                      Break;
              };
              Log (info <"lasterror:" <getlasterror ());
              // Close read pipe and wait for the finish
              Closehandle (hreadpipe );
              Waitforsingleobject (PI. hprocess, infinite );
              Closehandle (PI. hprocess );
              Res = true;
          }
      }

Refer:
Http://msdn.microsoft.com/en-us/library/windows/desktop/ms682499 (V = vs.85). aspx