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Now you can write a short view to handle submissions. In the cab/views directory, create a file called snippets.py, and in it place the following code: from django.http import HttpResponseRedirect from django.shortcuts import render_to_response from cab.forms import AddSnippetForm def add_snippet(request): if request.method == 'POST': form = AddSnippetForm(author=request.user, data=request.POST) if form.is_valid(): new_snippet = form.save() return HttpResponseRedirect(new_snippet.get_absolute_url()) else: form = AddSnippetForm(author=request.user) return render_to_response('cab/add_snippet.html', { 'form': form }) This will instantiate the form, validate the data, save the new Snippet, and return a redirect (again, always redirect after a successful POST) to the detail view of that snippet. At first this looks great, but there s a problem lurking here. You re referring to request. user, which will be the currently logged in user (this is automatically set up by Django when the authentication system has been properly activated). But what happens if the person filling out this form isn t logged in The answer is that your data won t really be valid. When the current user isn t logged in, request.user is a dummy object representing an anonymous user, and it can t be used as the value of a snippet s author field. So what you need is some way to ensure that only logged-in users can fill out this form. Fortunately, Django provides an easy way to handle this, via a decorator in the authentication system called login_required. You can simply import it and apply it to your view function, and anyone who s not logged in will be redirected to a login page: from from from from django.http import HttpResponseRedirect django.shortcuts import render_to_response django.contrib.auth.decorators import login_required cab.forms import AddSnippetForm

create( digestor, algorithm ); if (impl != null) { return new Digest(impl); } } throw new IllegalArgumentException(algorithm); } // // these methods are kept the same as in the original MessageDigest,.

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read(); channel = (int)val - 48; // Convert ASCII value to digit if(channel > 0 && channel <= pinCount) { pulseOutput(channel); // Pulse the appropriate button } } } That s certainly a much shorter function than in the first version! There are a few things to pay careful attention to in the new version of the loop, though You ll notice that we have a new variable called channel, which is an integer While reading the serial port there is a cryptic line that sets the value of channel by taking the integer value of the val variable and subtracting 48 from it What s going on here The byte received from the serial port is not actually a number, as you would generally expect It s an ASCII value that represents a character, and that character may (or may not) be a number.

The ASCII code for the character 1 is 49, and the ASCII code for the character 2 is 50, and so on So when we receive a value of 1 from the serial port, the ASCII code that is transmitted (and loaded into the variable val ) is 49 What that line does is cast (convert) the value of val into an integer using the (int) prefix, then subtract 48 from it to convert it to the equivalent number If the value sent via the serial port is 1 it will come through as ASCII code 49, then have 48 subtracted from it, and end up as the integer 1.

// but for simplicity choose just some from the original API // public byte[] digest(ByteBuffer bb) { return impl.digest(bb); } } Our new API shields its users from the details needed only for the service provider. Moreover, it does immediately show that it s an API class because it s made final. Obviously, this is not a huge improvement over the original version, but remember that this is just an example. The new API is a modular library that allows extensions. It can define its own public way for extensibility, but doesn t need to. It can rely completely on the old providers. This might be useful in situations where only the client part of the old API is wrong. In this case, let s also define a way for people who want to write providers. Only in this way can you create a real rewrite that can completely replace the old API and send it to the black hole where you want it to be. Let s now define a new API for providers using an approach called, among NetBeans engineers, singletonizer: public abstract class protected abstract protected abstract protected abstract } Digestor<Data> { byte[] digest(Data data); Data create(String algorithm); void update(Data data, ByteBuffer input);

def add_snippet(request): if request.method == 'POST': form = AddSnippetForm(author=request.user, data=request.POST) if form.is_valid(): new_snippet = form.save() return HttpResponseRedirect(new_snippet.get_absolute_url()) else: form = AddSnippetForm(author=request.user) return render_to_response('cab/add_snippet.html', { 'form': form }) add_snippet = login_required(add_snippet)

The end result of all this trickery is that you send 1 at one end and get 1 out at the other end, but unfortunately it s not as simple as you might expect it to be! After converting the received value, val, to an integer value, channel, it is then tested to see if it falls inside the acceptable range from 1 to pinCount, which is the number of pins defined in the array Finally, if that test is met, the loop calls another function called pulseOutput(channel) which is where the actual work of firing the relay takes place void pulseOutput(int channel) { Serialprint("Output "); Serialprint(channel);.

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