c# calculate ean 13 check digit

c# ean 13 check digit

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For example, my current Rails application is public-facing and is visited by the GoogleBot on a daily basis Probably due to a bug existing at some point, the URL /favorites was indexed Unfortunately, /favorites is only supposed to be available to logged-in users However, once Google knows about a URL it will keep coming back for it in the future This is how I told it to stop:

def index return render :nothing => true, :status => 403 unless logged_in @favorites = current_userfavoritesall end

You may choose to use 404 when a resource of a specific given ID does not exist in your database (whether because it is an invalid ID or because the resource has been deleted) For example, GET /people/2349594934896107 doesn t exist in our database at all, so what do we display Do we render a show view with a flash message saying no person with that ID exists Not in our RESTful world A 404 would be better Moreover, if we happen to use something like acts_ as_paranoid and we know that the resource used to exist in the past, we could respond with 410 Gone The server encountered an unexpected condition which prevented it from fulfilling the request As you probably know by now, this is the status code that Rails serves up if you have an error in your code The 503 code comes in very handy when taking a site down for maintenance, particularly when upgrading RESTful web services One of this book s reviewers, Susan Potter, shares the following suggestion:

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In other cases, things didn t go quite as well The code in Example 619 is from another area in the same program It includes suspect calls to strcpy() and strcat(), which (following our own advice) should be replaced by calls to bounded functions In this case, the conditional check immediately preceding this code prevents a buffer over ow, but this code should still be repaired

For my projects, I create a stub Rails application that responds with a 503 for each valid type of request that comes in Clients of my services are usually services themselves or other applications, so this helps client developers that consume my web services know that this is a temporary blip and should be due to scheduled maintenance (and a good reminder for them to check the emails I sent them over the weekend instead of ignoring them)

Summary

You can specify layout options at the controller class level if you want to reuse layouts for multiple actions

strcpy(record, user); strcat(record, ":"); strcat(record, cpw);

class EventController < ActionController::Base layout "events", :only => [:index, :new] layout "global", :except => [:index, :new] end

String Determines the template name to use Symbol Call the method with this name, which is expected to return a string with

However, the patch proposed by Cashdollar (shown in Example 620) also included an easy-to-overlook and potentially dangerous coding error In the proposed patch, Cashdollar makes a relatively common mistake in his use of strncat() by assuming that the bound to the function represents the size of the destination buffer rather than amount of space remaining Unless the destination buffer is empty, the bound will not limit the function to writing inside the allocated memory In this situation, the vulnerability is still mitigated by a bounds check earlier in the code However, the overall security risk is now increased because the earlier check might be removed because the bounded call to strncat() appears to render it redundant

The optional arguments are either :only or :except and expect an array of action names that should or should not apply to the layout being specified

The life cycle of a Rails application is divided into requests Rendering a template, whether the default one or an alternate one or, for that matter, rendering a partial or some text or anything is the final step in handling a request Redirecting, however, means terminating the current request and asking the client to initiate a new one

In this chapter, we covered designing and implementing conversational services The conversational capabilities provided by SCA simplify application code by removing the need to pass context information as service operation parameters and manually manage state in component implementations Having concluded the majority of our discussion of the SCA Java programming model, in 5, Composition, we return to assembling composites and in particular deal with how to architect application modularity through the SCA concept of composition

Look again at the example of the form-handling create method:

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