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Check if a file exists on the web.

 
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Check if a file exists on the web.
AntiBNI
26 Jan, 2008 - 03:54 PM
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I'm trying to make a check for updates option for my app.

i want to check if an URL exists on my web page.

Ex:
http://www.test.com/updates/update.exe

i have tested with fopen,but it always returns NULL.

I will like to know what is the right way to see if a file is present in that URL,so i can download it.

Thanks in Advance.
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jpw1991
RE: Check If A File Exists On The Web.
26 Jan, 2008 - 06:00 PM
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fopen won't work, it's for files on the computer where the program is running. I've got no idea how you'd do this tbh, but with anything internet related you usually need sockets.

This is a brilliant C tutorial, and it covers sockets under Unix and Linux: http://www.cs.cf.ac.uk/Dave/C/

If you you're going to be compiling your program for windows, you will need to learn Winsock. I don't have any links for that sorry, you'll have to google it.
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NickDMax
RE: Check If A File Exists On The Web.
26 Jan, 2008 - 09:42 PM
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Basically you will need to learn a little bit about web programming to use a URL. If it were me I would probably write a webservice (SOAP) that would check for updates.

you pass the webservice a hash value for your app's current config and it compares that to the current hash value for the app -- if they don't match you can then send a list of hashes for the current files which should tell the web app what files are missing/out of date.

Course there are probably lots of different ways to do things, but getting a listing of a directory just does not seem like the best solution to me.
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