Hide command prompt window when using Exec()
You're always going to get a window flash with Exec()
. You can use Run()
instead to execute the command in a hidden window. But you can't directly capture the command's output with Run()
. You'd have to redirect the output to a temporary file that your VBScript could then open, read, and delete.
For example:
With CreateObject("WScript.Shell")
' Pass 0 as the second parameter to hide the window...
.Run "cmd /c tasklist.exe > c:\out.txt", 0, True
End With
' Read the output and remove the file when done...
Dim strOutput
With CreateObject("Scripting.FileSystemObject")
strOutput = .OpenTextFile("c:\out.txt").ReadAll()
.DeleteFile "c:\out.txt"
End With
The FileSystemObject
class has methods like GetSpecialFolder()
to retrieve the path of Windows temp folder and GetTempName()
to generate a temporary filename that you can use instead of hardcoding an output filename as I've done above.
Also note that you can use the /FO CSV
argument with tasklist.exe
to create a CSV file which should make parsing it much easier.
Finally, there are VBScript "native" ways to retrieve the list of running processes. WMI's Win32_Process
class, for example, can do this without the need for Run/Exec
.
Edit:
For the sake of completeness, I should mention that your script can relaunch itself in a hidden console window where you can run Exec()
silently. Unfortunately, this hidden console window will also hide your output from functions like WScript.Echo()
. Aside from that, however, you probably won't notice any differences running your script under cscript
vs wscript
. Here's an example of this method:
' If running under wscript.exe, relaunch under cscript.exe in a hidden window...
If InStr(1, WScript.FullName, "wscript.exe", vbTextCompare) > 0 Then
With CreateObject("WScript.Shell")
WScript.Quit .Run("cscript.exe """ & WScript.ScriptFullName & """", 0, True)
End With
End If
' "Real" start of script. We can run Exec() hidden now...
Dim strOutput
strOutput = CreateObject("WScript.Shell").Exec("tasklist.exe").StdOut.ReadAll()
' Need to use MsgBox() since WScript.Echo() is sent to hidden console window...
MsgBox strOutput
Of course, if your script expects command-line parameters, those would need to be forwarded when relaunching your script as well.
Edit 2:
Yet another possibility is to use the Windows clipboard. You can pipe the output of your command to the clip.exe
utility. Then, retrieve the text via any number of available COM objects that can access the contents of the clipboard. For example:
' Using a hidden window, pipe the output of the command to the CLIP.EXE utility...
CreateObject("WScript.Shell").Run "cmd /c tasklist.exe | clip", 0, True
' Now read the clipboard text...
Dim strOutput
strOutput = CreateObject("htmlfile").ParentWindow.ClipboardData.GetData("text")
You can use .Exec()
method, without console window flash, temp files and unexpected WScript.Echo
output muting. The method is slightly tricky, and requires to launch secondary linked script, so I added the comments:
Option Explicit
Dim objDummy, strSignature, objPrimary, objSecondary, objContainer, objWshShell, objWshShellExec, strResult
' this block is executed only in the secondary script flow, after primary script runs cscript
If WScript.Arguments.Named.Exists("signature") Then
' retrieve signature string from argument
strSignature = WScript.Arguments.Named("signature")
Do
' loop through all explorer windows
For Each objContainer In CreateObject("Shell.Application").Windows
' check if the explorer's property with signature name contains the reference to the live script
If ChkVBScriptTypeInfo(objContainer.getProperty(strSignature)) Then
Exit Do
End If
Next
WScript.Sleep 10
Loop
' create shell object within secondary script
Set objWshShell = CreateObject("WScript.Shell")
' retrieve the primary script me object reference from explorer's property with signature name
Set objPrimary = objContainer.getProperty(strSignature)
' quit explorer window to release memory as it's no longer needed
objContainer.Quit
' assign the secondary script me object to the primary script's variable
Set objPrimary.objSecondary = Me
' emtpy loop while primary script is working
Do While ChkVBScriptTypeInfo(objPrimary)
WScript.Sleep 10
Loop
' terminate secondary
WScript.Quit
End If
' the code below is executed first in the primary script flow
' create signature string
strSignature = Left(CreateObject("Scriptlet.TypeLib").Guid, 38)
' create new hidden explorer window as container to transfer a reference between script processes
Set objContainer = GetObject("new:{C08AFD90-F2A1-11D1-8455-00A0C91F3880}")
' put this script's me object reference into explorer's property
objContainer.putProperty strSignature, Me
' launch new secondary process of the same script file via cscript.exe with hidden console window, providing signature string in named argument to identify host script
CreateObject("WScript.Shell").Run ("""" & Replace(LCase(WScript.FullName), "wscript", "cscript") & """ //nologo """ & WScript.ScriptFullName & """ ""/signature:" & strSignature & """"), 0
' wait until secondary script has been initialized and put his me object into this script variable
Do Until ChkVBScriptTypeInfo(objSecondary)
WScript.Sleep 10
Loop
' here is your code starts...
' create exec object within hidden console window of secondary script, execute cmd instruction
Set objWshShellExec = objSecondary.objWshShell.Exec("%comspec% /c tasklist")
' read cmd output
strResult = objWshShellExec.StdOut.ReadAll()
WScript.Echo strResult
' ...
' utility check if me object is live
Function ChkVBScriptTypeInfo(objSample)
On Error Resume Next
If TypeName(objSample) <> "VBScriptTypeInfo" Then
ChkVBScriptTypeInfo = False
Exit Function
End If
ChkVBScriptTypeInfo = True
End Function
UPDATE
I've slightly reworked the code to make it more straightforward:
Option Explicit
Dim strCmd, strRes, objWnd, objParent, strSignature
If WScript.Arguments.Named.Exists("signature") Then WshShellExecCmd
strCmd = "%comspec% /c tasklist"
RunCScriptHidden
WScript.Echo strRes
Sub RunCScriptHidden()
strSignature = Left(CreateObject("Scriptlet.TypeLib").Guid, 38)
GetObject("new:{C08AFD90-F2A1-11D1-8455-00A0C91F3880}").putProperty strSignature, Me
CreateObject("WScript.Shell").Run ("""" & Replace(LCase(WScript.FullName), "wscript", "cscript") & """ //nologo """ & WScript.ScriptFullName & """ ""/signature:" & strSignature & """"), 0, True
End Sub
Sub WshShellExecCmd()
For Each objWnd In CreateObject("Shell.Application").Windows
If IsObject(objWnd.getProperty(WScript.Arguments.Named("signature"))) Then Exit For
Next
Set objParent = objWnd.getProperty(WScript.Arguments.Named("signature"))
objWnd.Quit
objParent.strRes = CreateObject("WScript.Shell").Exec(objParent.strCmd).StdOut.ReadAll()
WScript.Quit
End Sub
BTW, here is VBScript "multithreading" implementation that uses the same container approach.
Some great suggestions are listed above. I'd like to make one more suggestion which is more of a workaround. You can use Sysinternals Desktops (a free program) to run your macro on another desktop on your same machine. That way the flashing can all happen on its own desktop and won't interrupt your work.