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Vector and Bitmap Graphics Just as display devices have two general methods of operation, graphics file formats can be divided into two general classes, vector and bitmap2 Vector graphics formats use a series of drawing commands to represent an image A Windows metafile is a commonly used vector graphics format Figure 13 contains a simple vector image created using commands to draw two arcs and a rectangle Vector graphics formats are not limited to output devices, such as plotters, that create images through drawing commands Computer monitors and laser printers usually have software that converts vector commands into pixels There are two main drawbacks with vector graphics First, they are not suitable for reproducing photographs or paintings A painting such as Whistlers Mother would require tens of thousands of drawing commands simply determining which commands to use to represent the painting would be a monumental task Second, complex images take a long time to display On most display systems, each vector object has to be converted to a pixel image All of the image formats covered in this book are bitmap image formats Such formats represent images as 2-dimensional arrays where ach array element represents a color to be displayed at a specific location When displayed on a computer screen, each element is generally mapped to a single screen pixel If pixels are close enough on the display device, it becomes difficult for the human eye to detect the array structure that composes the image The greatest advantage of bitmap images is their quality As the amount of disk space and memory has increased along with the speed of processors, the use of bitmap images has expanded as well One of the most visible examples of this is in the computer game industry Currently even games that require high performance, such as flight simulators and shoot-em-ups, use bitmap graphics Contrast the graphics in games like Quake and Doom to the vector graphics of Tank or even the Death Star graphics in the original Star Wars movie A major drawback with bitmap images is the amount of data required to hold them The size of an image in bytes (not counting overhead) is width height bits per pixel + 7 8 Thus, an 800 x 600 image with 24 bits per pixel requires 1,440,000 bytes of memory to display or disk space to store As the amount of memory on computers has grown, so has the number and size of images that can be displayed at the.

As we saw, the initiator and the responder each calculate the SKEYID based on the shared secret and by sending their respective HASH value to the other party during the authentication exchange (messages 5 and 6 of main mode) they provide adequate proof for authentication The SKEYID_e that is derived from SKEYID (see previous section) is used to protect this IKE exchange A note is now in order: an observant reader might have already noticed, both HASH_I and HASH_R use the SAi in their calculation We believe that this was an unfortunate typing error in specification (HASH_R should be calculated using the SA of the responder, SAr), but IETF decided not to correct the error to preserve RFC-compliant implementations IKE authentication using pre-shared keys has two problems: scalability and lookup key issues.

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OnConnection Method Now that you ve created the project for your add-in, you ll want to add some code to make it do something interesting Figure 203 shows the data ow for our add-in The data ow for each add-in will differ depending on the activities it performs Of course, every add-in has a similar data ow that is de ned by the COM add-in architecture and implemented via the IDTExtensibility2 interface However, Figure 03 shows only the data ow for our FormUtilities add-in This diagram will be useful as a reference as we talk about each of the different methods in turn. In Visual Studio .NET Using Barcode creation for ASP.NET Control to generate, create EAN-13 .Related: Generate EAN-13 .NET , Create EAN 128 .NET , Print UPC-A .NET

The scalability and administration problems stems from the fact that a node that engages in IKE exchanges with N parties requires N 1 passwords The second problem arises from the fact that the password is used to calculate the SKEYID and the SKEYID_e, used for encryption of authentication exchange of phase 1Related: Codabar Generating NET , NET ITF-14 Generating , Generate Interleaved 2 of 5 NET.

It s important to note that there is never more than one instance of a particular COM add-in loaded for the application However, multiple windows can be open at any time Therefore, if you need to add or update a toolbar (or button, menu item, and so on), you must obtain these UI objects dynamically through the CommandBars collection on the currently active window If you instead store a reference to a user interface object as a ata member of the class, you will most likely not see the behavior you expect The object reference you store in the class will not be the reference of the current window unless your users never open more than one window Back in CreateToolbar, if the GetCurrentToolbar method returns. Barcode Printer In .NET Framework Using Barcode printer for ASP.NET Control to generate, create bar code .Related: .NET Codabar Generator , ITF-14 Generator .NET , Interleaved 2 of 5 Generation .NET

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Painting DataMatrix In VS .NET Using Barcode maker for ASP.NET Control to generate, create Data Matrix . IDTExtensibility2 Interface In order for a component to e considered a COM add-in, it must implement the IDTExtensibility2 interface (see the MSDN reference listed in the Appendix) Through this interface, the add-in is alerted of various events that occur in the application, such as when the application is started, when it is shut down, when the add-in is loaded, and so on Table 201 lists the methods of the IDTExtensibility2 interface It is through the OnConnection method of the IDTExtensibility2 interface that the COM add-in obtains access to the application object of the hosting application The application object is one of those shared.Related: .NET EAN-8 Generation , UPC-E Generating .NET , .NET ISBN Generating

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NET Using Barcode generation for .NET Control to generate, create QR Code 2d barcode image in .NET .Adding User Interface Items To be useful, most COM add-ins add some custom buttons, menu items, or other items to the user interface of the pplication that is hosting the addin These UI elements give your users a way to interact with your COM add-in Adding UI elements in InfoPath 2007 is typically done by using the CommandBars collection and CommandBar object Therefore, as we show you how to create COM add-ins for InfoPath, along the way, we ll also show you how to use the CommandBars collection to add your own UI However, there is one thing you should keep in mind if you plan to create a COM add-in to be shared by multiple applications As we re sure you ve noticed by now, certain applications in the 2007 Microsoft Of ce system now include a new user interface the Ribbon Certain other applications, including InfoPath, do not Therefore, the process of creating user interface elements for add-ins that are shared across multiple applications is a little more dif cult Since our discussion of COM add-ins is limited to InfoPath 2007, however, we will only show you how to add UI using the CommandBars collection As we ve mentioned, since a full discussion of creating UI, whether you re using command bars or the Ribbon, is outside the scope of this book, we will once again refer you to the MSDN online documentation However, once we walk through the samples together, you should have enough knowledge to add any user interface elements to InfoPath that you like Now, without further ado, let s create our rst COM add-in for InfoPath.Related: Generate Intelligent Mail .NET

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attributes, and data; format them nicely; and display them in the task pane This process, as you can imagine, could take a while depending on the size of the form So, you probably want to have the ActiveX control alert the COM add-in when the operation is complete At that point, the COM add-in can do such things as enable the refresh button (If the ActiveX control does the work to retrieve and format the XML synchronously, this obviously doesn t need to be done However, for such a long operation, you probably will want to do this work asynchronously, in which case you will need a way to tell the addin that the work is complete) To make this work, you ll rst want to create an interface that can be implemented by the COM add-in and used by the ActiveX control This interface, which we ll call IFormDataViewAddIn, is shown in Listing 2015 (Since this interface will be alled from unmanaged code, we have to specify the attributes needed for COM interop ComVisible, InterfaceType, and Guid). 3 Of 9 Generation In .NET Using Barcode printer for ASP.NET Control to generate, create ANSI/AIM .Related: 

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