PingCheckResult.txt
20190822

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20190822


https://stackoverflow.com/questions/3050898/how-to-check-if-ping-responded-or-not-in-a-batch-file


I want to continuously ping a server and see a message box when ever it responds i.e. server is currently down. I want to do it through batch file.
I can show a message box as said here Show a popup/message box from a Windows batch file
and can ping continuously by 
ping <servername> -t

But how do I check if it responded or not?

The following checklink.cmd program is a good place to start. It relies on the fact that you can do a single-shot ping and that, if successful, the output will contain the line:
Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),

By extracting tokens 5 and 7 and checking they're respectively "Received" and "1,", you can detect the success.
@setlocal enableextensions enabledelayedexpansion
@echo off
set ipaddr=%1
:loop
set state=down
for /f "tokens=5,6,7" %%a in ('ping -n 1 !ipaddr!') do (
    if "x%%b"=="xunreachable." goto :endloop
    if "x%%a"=="xReceived" if "x%%c"=="x1,"  set state=up
)
:endloop
echo.Link is !state!
ping -n 6 127.0.0.1 >nul: 2>nul:
goto :loop
endlocal


Call it with the name (or IP address) you want to test:
checklink 127.0.0.1
checklink localhost
checklink nosuchaddress


Take into account that, if your locale is not English, you must replace Received with the corresponding keyword in your locale, for example recibidos for Spanish. Do a test ping to discover what keyword is used in your locale.

To only notify you when the state changes, you can use:
@setlocal enableextensions enabledelayedexpansion
@echo off
set ipaddr=%1
set oldstate=neither
:loop
set state=down
for /f "tokens=5,7" %%a in ('ping -n 1 !ipaddr!') do (
    if "x%%a"=="xReceived" if "x%%b"=="x1," set state=up
)
if not !state!==!oldstate! (
    echo.Link is !state!
    set oldstate=!state!
)
ping -n 2 127.0.0.1 >nul: 2>nul:
goto :loop
endlocal

However, as Gabe points out in a comment, you can just use ERRORLEVEL so the equivalent of that second script above becomes:
以 ERRORLEVEL 檢查 ping 結果:
@setlocal enableextensions enabledelayedexpansion
@echo off
set ipaddr=%1
set oldstate=neither
:loop
set state=up
ping -n 1 !ipaddr! >nul: 2>nul:
if not !errorlevel!==0 set state=down
if not !state!==!oldstate! (
    echo Link is !state!
    set oldstate=!state!
)
ping -n 2 127.0.0.1 >nul: 2>nul:
goto :loop
endlocal



The question was to see if ping responded which this script does.
However this will not work if you get the Host Unreachable message as this returns ERRORLEVEL 0 and passes the check for Received = 1 used in this script, returning Link is UP from the script. Host Unreachable occurs when ping was delivered to target notwork but remote host cannot be found.
If I recall the correct way to check if ping was successful is to look for the string 'TTL' using Find.
@echo off
cls
set ip=%1
ping -n 1 %ip% | find "TTL"
if not errorlevel 1 set error=win
if errorlevel 1 set error=fail
cls
echo Result: %error%
This wont work with IPv6 networks because ping will not list TTL when receiving reply from IPv6 address.