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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