Programming Forums > Web Development and Design > PHP

Jessehk · Nov 6th, 2007, 9:50 PM

Hi all. I'm a maintainer for my school's website and recently, a teacher had put forward a request. He wants the website to download an image every hour and save it to disk.

This might be a stupid question, but is this sort of thing possible in PHP? I've attempted to put together something quickly using the copy() function and the Google logo, but I'm getting permission errors when I attempt to write the image to disk.

Am I approaching this the correct way, or is there something that I'm missing? I'm not looking for a specific solution, but some general direction of how to proceed would be really appreciated.

Wizard1988 · Nov 6th, 2007, 10:24 PM

Can you post your current code?

PhilBon · Nov 7th, 2007, 1:29 AM

Make sure that you have access to write to that folder. Most the time on PHP servers the only access for the end users is read only. Run through your code and if you know that you are getting stopped at the writing part, chances are it's that the permissions have not been set up.

Jessehk · Nov 7th, 2007, 9:11 PM

Quote:

Originally Posted by PhilBon

Make sure that you have access to write to that folder. Most the time on PHP servers the only access for the end users is read only. Run through your code and if you know that you are getting stopped at the writing part, chances are it's that the permissions have not been set up.

My only concern was that if I set write permission for a specific folder (even if it was just for containing the image downloads in question), it would be insecure. Is there any reason that I should avoid doing that?

Ghost · Nov 7th, 2007, 10:08 PM

I program in .Net so I'd more than likely make a service or shedule a task to run every hour and download on the server, is that possible for you to do?

Sane · Nov 7th, 2007, 11:53 PM

There are operations for accessing an external web page internally. You could do this with raw sockets even if you have to (Connect to the server, Request the image, Receive the image, Cast some black magic).

Make sure to use the correct header information to request the image (GET /myimage.jpg HTTP/1.1\r\nHost: mywebsite.com\r\nContent-type: image/jpeg\r\n\r\n), and then use your file IO functions (Open File, Write to File, What the hell does this do?) with a binary write stream to save the image locally.

Then, of course, automate this with an hourly crontab.

Dameon · Nov 8th, 2007, 8:11 AM

Quote:

Originally Posted by Jessehk

My only concern was that if I set write permission for a specific folder (even if it was just for containing the image downloads in question), it would be insecure.

It would be much nicer if you could save the image to disk without writing to it, hmm?

Nov 6th, 2007, 9:50 PM	#1
Jessehk The Oblivious One Join Date: May 2005 Location: Ontario, Canada Posts: 644 Rep Power: 4	Downloading an external image and saving it to disk Hi all. I'm a maintainer for my school's website and recently, a teacher had put forward a request. He wants the website to download an image every hour and save it to disk. This might be a stupid question, but is this sort of thing possible in PHP? I've attempted to put together something quickly using the copy() function and the Google logo, but I'm getting permission errors when I attempt to write the image to disk. Am I approaching this the correct way, or is there something that I'm missing? I'm not looking for a specific solution, but some general direction of how to proceed would be really appreciated. __________________ Dr. Zoidberg: [ecstatic] I'm going to a movie... with FRIENDS!

Nov 6th, 2007, 10:24 PM	#2
Wizard1988 Professional Programmer Join Date: Oct 2005 Location: Chitown Posts: 417 Rep Power: 4	Re: Downloading an external image and saving it to disk Can you post your current code? __________________ JG-Webdesign

Nov 7th, 2007, 1:29 AM	#3
PhilBon Hobbyist Programmer Join Date: Nov 2005 Posts: 172 Rep Power: 3	Re: Downloading an external image and saving it to disk Make sure that you have access to write to that folder. Most the time on PHP servers the only access for the end users is read only. Run through your code and if you know that you are getting stopped at the writing part, chances are it's that the permissions have not been set up.

Nov 7th, 2007, 10:08 PM	#5
Ghost Man Bear Pig Hunter Join Date: Jul 2005 Location: NorCal, USA Posts: 295 Rep Power: 4	Re: Downloading an external image and saving it to disk I program in .Net so I'd more than likely make a service or shedule a task to run every hour and download on the server, is that possible for you to do?

Nov 7th, 2007, 11:53 PM	#6
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,886 Rep Power: 5	Re: Downloading an external image and saving it to disk There are operations for accessing an external web page internally. You could do this with raw sockets even if you have to (Connect to the server, Request the image, Receive the image, Cast some black magic). Make sure to use the correct header information to request the image (GET /myimage.jpg HTTP/1.1\r\nHost: mywebsite.com\r\nContent-type: image/jpeg\r\n\r\n), and then use your file IO functions (Open File, Write to File, What the hell does this do?) with a binary write stream to save the image locally. Then, of course, automate this with an hourly crontab. Last edited by Sane; Nov 8th, 2007 at 12:06 AM.

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Programming Forums > Web Development and Design > PHP

Downloading an external image and saving it to disk