Windows cmd: Parsing output from Ping - parsing

Question

I would like to execute a ping and, after evaluating the output, return a single line like "0 - check_ping rta=1 loss=0".
0 and 1 being extracted from the ping, of course.
I came this far:
#setlocal enableextensions enabledelayedexpansion
#echo off
set ip=%1
set num=%2
for /f "tokens=* delims= " %%f in ('ping -n %num% %ip%') do (
set line=%%f
call :processLine
)
echo 0 myTestService loss=!loss! rta=%rta:~1,-2% further information for myTestService
GOTO:EOF
:processLine
for /f "tokens=1,2,3,4,5,6 delims==(%%" %%A in ("%line%") do (
if "%%A" == "Packets: Sent " (
set loss = %%E
echo DD%%E
echo Loss is [!loss!]
)
if "%%A" == "Minimum " (
set rta=%%D
echo RTA is [!rta:~1,-2!]
)
)
It doesn't work and I asume that it is because of some runtime problems. Obviously I am not a cmd expert, but I read that those for-loops can be tricky in regard of setting variables and accessing them later on.
Any help is greatly appreciated.
Warmest regards, freiraum

Answer 1

Here's an example which doesn't require delayed expansion, and, for efficiency, uses find.exe, to process only the lines from which you wish to extract substrings, and without calling a label:
#Echo Off
SetLocal EnableExtensions
If "%~2" == "" Exit /B
Set "loss="
For /F "Tokens=6,8 Delims== " %%G In ('%SystemRoot%\System32\PING.EXE -n %~2 %~1
^| %SystemRoot%\System32\find.exe ","') Do If Not Defined loss (Set "loss=%%H"
) Else Set "rta=%%G"
If Not Defined loss Exit /B
Echo 0 myTestService loss=%loss:~1,-1% rta=%rta:~,-2% further information for myTestService

Answer 2

The following code does what I want it to. There are still mistakes ("tokens=* delims= "), but these seem negligible - at least I hope so.
#setlocal enableextensions enabledelayedexpansion
#echo off
set ip=%1
set num=%2
for /f "tokens=* delims= " %%f in ('ping -n %num% %ip%') do (
call :processLine "%%f"
)
echo 0 myTestService loss=!loss:~1! rta=!rta:~0,-2! further information for myTestService
GOTO:EOF
:processLine
for /f "tokens=1,9,11 delims= " %%A in ("%~1") do (
if "%%A" == "Packets:" (
set loss=%%C
rem echo Loss is !loss:~1!
)
if "%%A" == "Minimum" (
set rta=%%B
rem echo RTA is !rta:~0,-2!
)
)