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Check for Internet being UP.
Message
 
À
30/05/2007 10:08:50
Mike Cole
Yellow Lab Technologies
Stanley, Iowa, États-Unis
Information générale
Forum:
Visual FoxPro
Catégorie:
Applications Internet
Versions des environnements
Visual FoxPro:
VFP 8 SP1
OS:
Windows XP SP2
Network:
Windows 2003 Server
Database:
Visual FoxPro
Divers
Thread ID:
01229275
Message ID:
01229454
Vues:
17
Ping is not really a reliable protocol to use especially if you plan to use HTTP - more and more servers block Ping as a protocol.

I still maintain the best way to check for internet connectivity is to hit a Web site that is most likely to be up and see if you get a result and do it with a timeout.

In wwIPStuff I have a method wwHttpPing that does this. This has the additional advantage that you can point at a specific Web site so if you're planning on retrieving content from there you can get a pretty good idea whether that site is actually up.

The key thing with any mechanism though is the timeout - whatever you do you don't want to synchronously check a connection that you might expect to be non-available for the TCP/IP timeout (about 40 seconds) and that gets a little bit tricky (in WinInet you have to set WinInet options for this for example).

+++ Rick ---

>>Hi Gang!
>>
>>Do you have guys have any suggestions for code or utilities to use in VFP to check if the Internet is UP to a certain URL (able to connect to the site) and return this info to VFP?
>>
>>Thanks!
>
>Can you somehow emulate a PING command in VFP?
+++ Rick ---

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