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c# pdf parser library: Open Source PDF Libraries in C#



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Note PHP 4 does not recognize the __construct() method as a constructor. If you are using PHP 4, you can create a constructor by declaring a method with the same name as the class that contains it. So for a class called ShopProduct, you would declare a constructor using a method named shopProduct().

def add_snippet(request): if request.method == 'POST': form = SnippetForm(data=request.POST)



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OpenOffice is the leading open source office software suite consisting of word-processing, spreadsheet, presentation, and database applications. It s typically used in graphical mode to create documents, but you can also run it in server mode to convert documents from one format to another on the fly. Liferay s Document Library portlet incorporates this feature (see 9).

PHP still honors this naming scheme, but unless you are writing for backward compatibility, it is better to use __construct() when you name your constructor methods.

Selecting the top-level Instances tab in the Admin portlet displays all the server instances (see Figure 12-11).





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if form.is_valid(): new_snippet = form.save() return HttpResponseRedirect(new_snippet.get_absolute_url()) else: form = SnippetForm() return render_to_response('cab/add_snippet.html', { 'form': form }) add_snippet = login_required(add_snippet) However, this isn t quite right. The Snippet needs to have an author filled in, but you ve left that field out of the form. You could go back and define a custom __init__() method again and pass in request.user, but ModelForm has one more trick up its sleeve. You can have ModelForm create the Snippet object and return it without saving; you do this by passing an extra argument commit=False to its save() method. When you do this, save() will still return a new Snippet object, but it will not save it to the database. This will leave you free to add the user yourself and manually insert the new Snippet into the database: from from from from from django.http import HttpResponseRedirect django.forms import ModelForm django.shortcuts import render_to_response django.contrib.auth.decorators import login_required cab.models import Snippet

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A ShopProduct object is now easier to instantiate and safer to use. Instantiation and setup are completed in a single statement. Any code that uses a ShopProduct object can be reasonably sure that all its properties are initialized. This predictability is an important aspect of object-oriented programming. You should design your classes so that users of objects can be sure of their features. By the same token, when you use an object, you should be sure of its type. In the next section, we examine a mechanism that we can use to enforce object types in method declarations.

Figure 12-11. Displaying server instances You can add more server instances by clicking the Add button. On the resulting screen, enter the following information: Web ID: Provide a user-specified ID, generally the domain name. Virtual Host: Specify the domain name that you have configured in your network. When the user opens the web site in her browser using this domain name, she will be redirected to the Liferay server. The server will send her the appropriate portal instance. Mail Domain: Specify the domain name for the mail host used by this portal instance. Liferay uses this mail domain to send notification messages.

is_subclass_of() will tell you only about class inheritance relationships. It will not tell you that a class implements an interface. For that, you should use the instanceof operator.

class SnippetForm(ModelForm): class Meta: model = Snippet exclude = ['author']

After you have entered the information, click the Save button to save your changes. Now open the browser and navigate to the portal using the specified domain name. You will see the new instance of Liferay running in the browser. You can configure this new instance independently of the previous instance.

We have already encountered an example in which we used a string to invoke a method dynamically: $product = getProduct(); // acquire an object $method = "getTitle"; // define a method name print $product->$method(); // invoke the method PHP also provides the call_user_func() method to achieve the same end call_user_func() can invoke either methods or functions To invoke a function, it requires a single string as its first argument: $returnVal = call_user_func("myFunction"); To invoke a method, it requires an array.

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