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Once the form POST has been received by the application and the credentials validated, the application issues a session token to the browser in an HTTP cookie The browser automatically returns the cookie with each subsequent request to the server, which allows the application to associate subsequent requests with this session and in turn with the user who initiated this session Hidden-form authentication: A less commonly used variant of the aforementioned scheme uses hidden form fields to transfer the session token, rather than cookies Here, the application dynamically renders HTML forms for all navigational elements, including a hidden field containing the session token.

When you click OK, you should see the component in the new tab in the Toolbox, as Figure 19-2 shows.

n 6, you explored ways you can share your mashups outside of the Popfly community. This chapter will begin examining how to create your own reusable functionality within Popfly. You can extend Popfly by the same means you have already used to create Popfly mashups: blocks. To get the most from this chapter, you will need knowledge of XML and JavaScript; I have suggested many sources of information on these in previous chapters, and I recommend you read up on them before proceeding.

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Now you can drag this control onto your form. Figure 19-3 shows how the control looks on a form in the designer. You can set its size and position just like you would any normal control. Windows Forms layout concepts like anchoring work too we could anchor the control to all four sides of the window to make it resize as the window resizes.

Left to its own devices, this particular control won t do anything we have to give it a PDF file to load before it will even show a UI, and that means using the control s API. Fortunately, one of the things Visual Studio did for us when we dragged the control onto the form was to import the component s type library. A COM type library contains metadata it lists the available classes, and describes their methods, properties, and events. This is similar in concept to the .NET metadata we explored in 17, but the details are all very different. Fortunately, the differences are not a problem, because when Visual Studio imported the type library, it generated a DLL containing the same information but as a .NET component. This makes it possible to use the PDF component from C#. You can see this generated library by expanding the References section of the Solution Explorer, as Figure 19-4 shows.

kind of COM component into a .NET project. But there s a second item there, AxAcroPDFLib, and it is specific to ActiveX controls. (Not all COM components are designed for UI use.) This ActiveX-specific generated DLL contains a class that derives from a special base class called AxHost, which is a Windows Forms control that can host an ActiveX control. Visual Studio generates a class called AxAcroPDF that derives from AxHost, and puts it in that AxAcroPDFLib. It s this AxAcroPDF class that has ended up on our form. This ActiveX wrapper provides .NET-callable versions of all the methods the control makes available to COM programs. So the upshot is that we can write C# in our code behind that invokes methods, sets properties, and handles events from this ActiveX control. In other words, it makes it feel just like a normal control, and that s the point Visual Studio has neatly hidden the fact that COM and .NET work very differently under the covers by generating these interop libraries for us. Example 19-1 shows a how we can program the control it shows the form s constructor in the code behind, and after the usual call to InitializeComponent, we re setting the control s src property, to tell it from where we d like it to fetch a PDF file.

3 It is important to note that in the case of both HTTP and cookie-based authentication, the browser caches the credential that is used to authenticate subsequent HTTP requests (the user s username/password, or the session cookie, respectively) and automatically supplies the credential along with any request made from that browser to the web server for which the credential is cached (eg, wwwmywwwservicecom) In particular, this includes requests that may be surreptitiously initiated by a malicious page, as shown in Section 1012 In other words, a malicious page can cause the user s browser to make requests to wwwmywwwservicecom that, a priori, will be processed by our application as if they were initiated by the user identified and authenticated by the credential in question..

public Form1() { InitializeComponent(); string pdf = "http://www.interact-sw.co.uk/downloads/ExamplePdf.pdf"; pdfAxCtl.src = pdf;

}

If we run the program, it loads the PDF document. As you can see from Figure 19-5, the control includes its own UI elements for interacting with the document. If you use Adobe s reader, this will probably look familiar to you the same ActiveX control typically gets used when you view PDF files in a web browser.

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