Checking for an internet connectio

Phil Davis revdev at pdslabs.net
Wed May 2 02:09:45 EDT 2012


Thanks for the heads-up Peter!

Phil


On 5/1/12 4:34 PM, Peter Haworth wrote:
> Hi Phil,
> Up to now, I've been using this on a Mac and it has worked fine as
> mentioned, despite the apparent discrepancy between between the empty/zero
> return code that's been mentioned.
>
> I tried it on Windows today and found that it was always returning false.
> Turns out the -t parameter on a Mac is in seconds but the -w parameter on
> Windows is in milliseconds, so the request was always timing out on Windows.
>
> Thanks again for the script.
>
> Pete
> lcSQL Software<http://www.lcsql.com>
>
>
>
> On Mon, Apr 30, 2012 at 10:48 AM, Phil Davis<revdev at pdslabs.net>  wrote:
>
>> Hi Bob,
>>
>> Have at it! You and others have expressed great ideas for improvements,
>> given various changes in the context and purpose for which it might be
>> used. I'm just glad to share it, and it's fun to see others adapt it for
>> their needs (and offer suggestions for core improvements).
>>
>> Phil
>>
>>
>>
>> On 4/30/12 8:41 AM, Bob Sneidar wrote:
>>
>>> Nice function. Simple and effective. What might make this a tad more
>>> better is to have a list of 5 domains, in case for some reason Google ever
>>> goes away or renames itself (hey it could happen!). Also, an alternate FTP
>>> method might be nice upon failure of ping, as some techs block ICMP at the
>>> firewall.
>>>
>>> Bob
>>>
>>> On Apr 28, 2012, at 12:30 PM, Phil Davis wrote:
>>>
>>>   Hi Peter,
>>>> I use "ping" to see if a given server is available. There are fewer bad
>>>> things that can happen using this approach than trying to get a URL. The
>>>> following code came from a recent project (slightly modified to protect the
>>>> innocent) - watch line wraps:
>>>>
>>>>
>>>> on mouseUp
>>>>    answer "Connection status ="&&   app_connectionStatus("google.**com<http://google.com>
>>>> ")
>>>> end mouseUp
>>>>
>>>>
>>>>
>>>> function app_connectionStatus pTargetDomain
>>>>
>>>>     -- attempt to ping the ctrainweb.com server
>>>>     switch (the platform)
>>>>         case "MacOS"
>>>>             put shell("ping -c 1 -t 5"&&   pTargetDomain) into tShellOutput
>>>>             put the result into tResult
>>>>             break
>>>>         case "Win32" -- PD 20100411
>>>>             set the hideConsoleWindows to true
>>>>             put shell("ping -n 1 -w 5"&&   pTargetDomain) into tShellOutput
>>>>             put the result into tResult
>>>>             break
>>>>         default -- all other OSes
>>>>             answer "This app cannot run on the"&&   the platform&&
>>>>   "platform."
>>>>             put param(0)&   colon&&   the platform&&   "platform not
>>>> supported" into tResult
>>>>
>>>>             break
>>>>     end switch
>>>>
>>>>     -- check for connection failure
>>>>     if tResult<>   empty
>>>>     then return false -- failed
>>>>     else -- connected, but how well?
>>>>         set the itemDel to comma
>>>>         if the platform = "Win32"
>>>>         then
>>>>             get tShellOutput
>>>>             filter it with "*(0% loss)*"
>>>>         else -- Mac
>>>>             repeat for each item tFilter in "* 0% packet loss*,* 0.0%
>>>> packet loss*" -- for different OS versons
>>>>                 get tShellOutput
>>>>                 filter it with tFilter
>>>>                 if it<>   empty then exit repeat
>>>>             end repeat
>>>>         end if
>>>>         return (it<>   empty)
>>>>     end if
>>>> end app_connectionStatus
>>>>
>>>>
>>>> HTH
>>>> Phil Davis
>>>>
>>>>
>>>>
>>>> On 4/28/12 12:12 PM, Peter Haworth wrote:
>>>>
>>>>> Just put together a procedure for checking for software updates from my
>>>>> SQLiteAdmin program.  All works great but I'm wondering the best way to
>>>>> check if there is an internet connection.  I tried this out by
>>>>> disconnecting my computer from my wireless router and I got an"invalid
>>>>> host
>>>>> address" message from libURLErrorData as soon as I called
>>>>> libURLDownloadToFile.
>>>>>
>>>>> I can easily check for that of course but it sounds like that message
>>>>> could
>>>>> come back in other circumstances so wondering if there's some other way
>>>>> to
>>>>> check for an internet connection before attempting a download.
>>>>>
>>>>> Pete
>>>>> lcSQL Software<http://www.lcsql.com>
>>>>> ______________________________**_________________
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>>>>>
>>>>>   --
>>>> Phil Davis
>>>>
>>>>
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>> --
>> Phil Davis
>>
>>
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-- 
Phil Davis





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