vbscript

How to run a command at the command line/execute a command:

• WshShell.Run("Regread.exe \\computername")
• Shell.Run "%comspec% /c regread.exe " & machineandkey & " > workfile.txt",0,True
• dim wshell, retval
  set wshell = createobject("WScript.Shell")
  retval = wshell.run ("regread.exe",,true)
  msgbox "Regread returned " & cstr(retval)
• Dim Shell
  Set Shell = CreateObject("Wscript.Shell")
  If WScript.Arguments.Count = 1 Then
    Shell.Run "%comspec% /cdir/a-d """ & WScript.Arguments(0) &_
      """|cscript """ & Wscript.ScriptFullName & """",0
    WScript.Quit
  End If
  Shell.Popup Wscript.StdIn.ReadAll
• [Wscript.Shell] Works great, except it'll only work for things that run in Windows Scripting Host (VBScript and JScript). This great because it's what I want to do, but it wouldn't work for an executable (.EXE)
• AspExec from www.serverobjects.com should be able to do this (in combination with the windows scripting host)

Criticisms:

• The If/Then statement evaluates cases beyond ones that definitively satisfy the conditions (sometime causing unexpected behaviors, possibly errors, that require ungainly workarounds like nested ifs).
  True
  "By design VBScript (like VB/VBA) does not short-cicuit compound expression evaluation."
• Parameters are passed by reference only.
  False

  From: Al Dunbar (Al_Dunbar@HoTMaiL.com)
  Subject: Re: How do you pass parameters by reference and by value in a VBScript sub/function?
  Newsgroups: microsoft.public.scripting.vbscript
  View this article only
  Date: 2000-11-05 11:36:03 PST
  
  By default, all parameters are passed by reference, unless either of the
  following two conditions applies:

  a) the formal parameter in the sub/function statement is prefixed with the
  "ByVal" qualifier:

  sub mysub( prm1, prm2, byref prm3, byref prm4, byval prm5, byval prm5 )

  b) the actual parameter passed is something that cannot be assigned a value:

  sub mysub( arg1, (arg2), arg3, (arg4), arg5, (arg6) )

  In the example above, the following are effectively passed by reference:
  arg1, arg3, while the rest are passed by value. Note that even when a formal
  parameter is defined (or defaulted) to byref an actual parameter can be
  passed by value (i.e. by passing an expression rather than a variable).
  However, if the formal parameter is defined with byval, there is no way to
  force the actual parameter to return a value.

  IMO, defining all parameters explicitly as either byref or byval is a good
  way to avoid unintended side effects, while at the same time improving the
  quality of the internal documentation of a procedure.

  
  /Al

• Variables dimensioned locally to a sub are not treated as separate objects across instantiations of the sub, as in a recursive sub. Rather the variable gets overwritten no matter what level of call depth is being run.
  ?
  
• No native hash data type.
  True
  However, the Scripting.Dictionary object is a workable imitation requiring no separate installation.

   

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Author: dtd

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