Can't run DIR from WScript Shell in VBA?

问题:

I use the following function in a lot of my VBA projects. I initially added the reference to Windows Script Host Object model to take advantage of Intellisense, but then switched to late binding so I didn't have to reference a bunch of stuff.

Private Function RunCMD(ByVal strCMD As String) As String
    'Runs the provided command
    Dim oShell As Object 'New WshShell
    Dim cmd As Object 'WshExec
    Dim x As Integer
    Const WshRunning = 0

    On Error GoTo wshError

    x = 0
    RunCMD = "Error"
    Set oShell = CreateObject("Wscript.Shell")
    Set cmd = oShell.Exec(strCMD)
    'Debug.Print strCMD
    'Stop
    Do While cmd.Status = WshRunning
        Sleep 100 'for 1/10th of a second
        x = x + 1
        If x > 1200 Then 'We've waited 2 minutes so kill it
            cmd.Terminate
            MsgBox "Error: Timed Out", vbCritical, "Timed Out"
        End If
    Loop

    RunCMD = cmd.StdOut.ReadAll & cmd.StdErr.ReadAll
    Set oShell = Nothing
    Set cmd = Nothing
    Exit Function

wshError:
    On Error Resume Next
    RunCMD = cmd.StdErr.ReadAll
    Resume Next
End Function

It works great when you do something like RunCMD("ping www.bing.com") or RunCMD("winrs -r:" & strHost & " reg query hklm\system\currentcontrolset\services\cdrom /v start")

However RunCMD("Dir c:\config* /a:-d /b /d /s") fails, and cmd.StdErr.ReadAll gives an Object Variable or With Block not set error. Even a simple RunCMD("Dir") fails.

Why does DIR make the WScript shell crap out? More importantly, how can I use CMD's DIR function (not VBA's DIR function!) to get a list of files that match a search pattern?

回答1:

Does it work if you preface your dir command with "cmd /c " and wrap your DOS command in double quotes, like

RunCmd("cmd /c ""DIR""")

or

RunCmd("cmd /c ""Dir c:\config* /a:-d /b /d /s""")