VFP: Ping

Visual Foxpro: Ping an IP number and return weither it has responded. Uses Windows scripting shell.

* Ping function
* (C)2011 Jasper de Graaf for J.A. Software
* Source: https://degraafonline.com
LPARAMETERS tcIpNumber && IP number to ping

* No parameter, wrong type or empty 
IF PCOUNT()=0 OR !VARTYPE(tcIpNumber)=[C] OR EMPTY(tcIpNumber)
 ? [ping needs character parameter ip number (ie: "192.168.1.254")]
 RETURN []
ENDIF 

* create scripting shell object and test
loShell = CreateObject("WScript.Shell")
IF VARTYPE(loShell)<>[O]
 ? [did not succeed in creating Wscript.Shell object]
 RETURN []
ENDIF 

* perform short single ping and get results
loScriptExec = loShell.Exec("ping -n 1 -w 2 "+tcIpNumber)
lcPing = loScriptExec.StdOut.ReadAll()
llPing = ![time-out]$LOWER(lcPing)

loScriptExec = null
loShell = null 
RETURN llPing

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