Author: masnun

PHP

Archiving Remote Files Using PHP

Post author By masnun
Post date August 17, 2009
5 Comments on Archiving Remote Files Using PHP

We can easily archive remote files on our server and put the archive for download by our users.

Here’s a code snippet:

<?php
$url = "http://www.google.com/intl/en_ALL/images/logo.gif";
$zip = new ZipArchive;
if ($zip->open('test.zip', ZipArchive::CREATE) === TRUE) {
   $zip->addFromString('logo.gif', file_get_contents($url));
    $zip->close();
    echo 'ok';
} else {
    echo 'failed';
}
?>

<?php

$url = "http://www.google.com/intl/en_ALL/images/logo.gif";

$zip = new ZipArchive;

if ($zip->open('test.zip', ZipArchive::CREATE) === TRUE) {

$zip->addFromString('logo.gif', file_get_contents($url));

$zip->close();

echo 'ok';

} else {

echo 'failed';

}

It uses the ZipArchive built in class of PHP to archive the target file which is stored on a remote host. It reads the remote file using “file_get_contents()” function and uses the “addFromString()” method of the ZipArchive object to add the data as a local file inside the archive. The first parameter of this method is the name of the file which will be inside the archive. This file is usually called “local file”. The second parameter is the file contents in raw string format. Instead of the file_get_contents(), we could use alternative fopen(), fread() or fgets() functions to get the file contents as string. But when we have better and quicker solution, why should we go for complex ones ?

Enjoy 🙂

Python

Using web.py with Google App Engine

Post author By masnun
Post date August 1, 2009
3 Comments on Using web.py with Google App Engine

I love coding in Python and have been exploring the excellent web.py framework lately. From what I’ve seen, web.py is a very simple yet powerful python based web framework. It’d take me a lot of time to learn django (if I ever manage to make up my mind into it) and it already took around a couple of hours to understand the Google App Engine’s default webapp framework.

web.py includes a built in web server to develop an application locally. But I am a Google fan and was thinking of deploying web.py on Google App Engine. I believed GAE and web.py together can help me put up a web app in minutes. And so did they… 😀

The first question came to my mind was “How am I going to install web.py on my GAE account ?”. Well, it was pretty easy in the end. Just extract the web.py package and put the “web” directory inside your application directory. That is the “web” directory would be in the same directory where the app.yaml file resides. Now, in app.yaml file, map all URLs to a single python file. In my case, it was “main.py”.

Now develop the application in the normal web.py way. “It’s easy as pie!” — I thought. But it was not that easy in fact. I had to make a couple of changes.

The app I wrote didn’t do what I expected it to. Rather it raised an “import error” 🙁 Later, I found out that I have to use “web.application.cgirun()” method instead of the normal “run()” method.

Then I reloaded the app. But this time I got an “internal server error”. After visiting the web.py cookbook, I found out that, to use web.py templates on GAE, I have to compile all templates using the “web/template.py –compile templates” command. I did so. All my templates were compiled into python source code. Cool !

Now my app was running smooth and working fine ! So, at last I made it… Yahoo ! I am loving python, web.py and Google App Engine together 😉

PS: I am using web.py 0.3 where I have the cgirun() method. In older versions of web.py, you have to be tricky. In that case, please consult this thread:

http://bit.ly/EoVyM

Here’s the source code (Without the template):

#!/usr/bin/env python

import web
urls = ("/(.*)","site")

class site:
	def GET(self,path):
		render = web.template.render('templates')
		return render.masnun(path)

app = web.application(urls,globals())

def main():
	app.cgirun()

if __name__ == '__main__':
  main()

#!/usr/bin/env python

import web

urls = ("/(.*)","site")

class site:

def GET(self,path):

render = web.template.render('templates')

return render.masnun(path)

app = web.application(urls,globals())

def main():

app.cgirun()

if __name__ == '__main__':

main()

Here’s the “templates/masnun.htm”:

$def with (name)
&lt;html&gt;&lt;head&gt;&lt;title&gt;web.py demo&lt;/title&gt;&lt;/head&gt;&lt;body&gt;
You requested: &lt;b&gt; $name&lt;/b&gt;&lt;/body&gt;&lt;/html&gt;

$def with (name)

You requested: <b> $name</b></body></html>

Python

ZIP, Python and TK

The title says it all. Here’s a very simple program written in Python and TK which can extract a ZIP file to the selected location.

Python 3 – Source Codes:

import zipfile
import tkinter, tkinter.filedialog
root = tkinter.Tk()
root.title("ZIP Unzipper")
frame = tkinter.Frame(root)
btn = tkinter.Button(frame)
inputBox = tkinter.Entry(frame)
label = tkinter.Label(frame,text="Target Location:")
def work():
	zipF = zipfile.ZipFile(tkinter.filedialog.askopenfile().name)
	zipF.extractall(inputBox.get())

btn['text'] = "Choose & Extract"
btn['command'] = work
label.pack()
inputBox.pack()
btn.pack()
frame.pack()
root.maxsize(100,100)
root.minsize(100,100)
root.mainloop()

import zipfile

import tkinter, tkinter.filedialog

root = tkinter.Tk()

root.title("ZIP Unzipper")

frame = tkinter.Frame(root)

btn = tkinter.Button(frame)

inputBox = tkinter.Entry(frame)

label = tkinter.Label(frame,text="Target Location:")

def work():

zipF = zipfile.ZipFile(tkinter.filedialog.askopenfile().name)

zipF.extractall(inputBox.get())

btn['text'] = "Choose & Extract"

btn['command'] = work

label.pack()

inputBox.pack()

btn.pack()

frame.pack()

root.maxsize(100,100)

root.minsize(100,100)

root.mainloop()

Explanations It creates a TK interface with a button and a text entry widgets. Clicking on the button invokes the work() function. The work() function displays a filedialog and prompts you to choose a ZIP file. Then it creates a new ZipFile object using the file location. The extractall() method of the ZipFile object extracts all contents of the archive into the directory specified using the inputBox text entry widget. We call inputBox.get() to get it’s value. If the value of target location is null, the files are extracted into the current working directory. In case of an invalid target location, it prints out error messages to the console.

It’s a very basic program with a little functionality. It mainly demonstrates the use of TK and Python to write GUI programs that really does something.

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