Checking for an internet connectio

[Phil Davis]

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")
>> 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