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4318 :: outputHandle problem

• fewjarsmith (orginal) [2018-10-17T04:54:45+02:00] view original

  The following two simple programs work together under LInux - but not Windows 10

  sayhello.nim:

  
  echo "Hello World"
  echo "Bye Bye"
  Run

  and runhello.nim

  
  import osproc
  
  var exeName = "sayhello"
  
  var tstprc = startProcess(exeName,"",[],nil,{poInteractive})
  var tstouthdl = tstprc.outputHandle()
  
  echo "tstouthdl=",tstouthdl.repr()
  
  var tstout:File
  
  if not tstout.open(tstouthdl):
      quit("Cannot Open tstout")
  
  var outline = tstout.readLine()
  echo "outline=",outline
  Run

  Both machines are using nim 0.19 and a vanilla nim c -r sourcename compiling command.

  What options/arguments/command-variations do I use to get the Windows 10 version to work?

  Thanks

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• fewjarsmith (orginal) [2018-10-19T21:21:53+02:00] view original

  Found a workaround by looking in osproc source:

  
  import osproc, streams
  
  var exeName = "sayhello"
  
  when defined(windows):
      exeName &= ".exe."
  
  echo "exeName=",exeName
  
  var tstprc = startProcess(exeName,"",[],nil,{
      poEvalCommand})
  
  var tstouthdl = tstprc.outputStream()
  
  var line = newStringOfCap(120).TaintedString
  
  while true:
      if tstouthdl.readLine(line):
          echo "piped:",line
      elif not running(tstprc): break
  
  close(tstprc)
  Run

  This uses a Stream instead of a FileHandle and a pre-created line buffer.

  Still not sure why a Stream works but a File does not! The different po-option did not cure the problem Adding the exe file name extension to exeName did not help either.

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• herbertvwright (orginal) [2019-01-15T11:07:55+01:00] view original

  Thank you for sharing. :) import osproc, streams

  var exeName = "sayhello"

  when defined(windows):

  exeName &= ".exe."

  echo "exeName=",exeName

  https://www.lost-identification.com

  var tstouthdl = tstprc.outputStream()

  var line = newStringOfCap(120).TaintedString

  while true:

  if tstouthdl.readLine(line):

  echo "piped:",line

  elif not running(tstprc): break

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