Checking if output is empty

Question

I want to check if the output of the netstat command I run in vbscript is empty or not. The below is not working as the port is not in use but it skips past that fact and goes to ERROR (else).

I think it is due to the IsNULL? I could not find what else I could use in vbscript?

Set netStatRun = objShell.Exec("cmd /C ""netStat -ano |find ""1002""""")
        netStatOutPut = netStatRun.StdOut.ReadLine
        WScript.Echo "The value is: " & netStatOutPut

            If IsNull(netStatOutPut) Then
                WScript.Echo "The port is free"
            Else
                WScript.Echo "ERROR! Port is use"
            End If

OUTPUT:

The value is:
ERROR! Port is use

rory.ap · Accepted Answer · 2015-03-31 14:10:46Z

2

Instead of using IsNull(netStatOutPut) try using Len(netStatOutPut) = 0

If Len(netStatOutPut) = 0 Then
    WScript.Echo "The port is free"
Else
    WScript.Echo "ERROR! Port is use"
End If

You can't use IsNull to determine that a string is a zero-length string.

answered Mar 31, 2015 at 14:10

rory.ap

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Markus · Accepted Answer · 2015-03-31 14:20:58Z

0

If netstatOutput = "" Then
    WScript.Echo "OK: port is free"
Else
    WScript.Echo "ERROR: port is in use"
End If

answered Mar 31, 2015 at 14:20

Markus

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