.net core qr code reader

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Special thanks to Glenn Cole who reviewed every chapter, provided quality control, and contributed the introduction. I would like to acknowledge the support of my family as I worked on this book. Thanks for putting up with my absence every evening and weekend I had to work on my chapters, and for your unreserved love. And thanks to my friends Ronada Wanner, Lenny Ramirez, Cesar Otero, and Luis Pulido, for cheering me on and believing in me. This book would not have been possible without the tireless professionalism of many staff at Apress. Many thanks go out to Clay Andres, for believing in me; our project manager Grace Wong, for her gentle reminders of my looming immutable deadlines; Caroline Rose, Kim Wimpsett, and Marilyn Smith for editing and copy editing duties (my chapter is much improved because of their efforts); Laura Esterman, Douglas Pundik, and Glenn Cole in production editing (the chapters look awesome!). To everyone else at Apress, thanks for everything you did to make this book a reality. PJ Cabrera

Specifies inline code Indicates lines of code Defines a section containing text description and an optional code example Specifies exceptions that may be generated Includes XML comments from a file Defines a bulleted or numbered list or table Defines a paragraph Describes a function parameter Specifies a hyperlink to the parameter Specifies access (e.g., public) Specifies the detailed description Specifies the return value information Specifies a cross-reference Lists additional references Specifies text that gives a brief synopsis Specifies a property description

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Before we get started with the installation process, we should first take a look at some of the issues related to running BizTalk on an XP box. Partition format: You need to have Windows XP installed on an NTFS formatted drive, not a FAT32 drive. You ll need to convert the drive to NTFS by running convert c: /fs:ntfs (if you re converting the C: drive) in a Command Prompt window, as shown in Figure 3-1.

In the preceding example, there are two catch blocks, and each block catches a different set of exceptions. The exceptions caught by each catch block depend on the type of the exception being thrown. In the first catch block, all exceptions that have IOException as a direct or indirect subclass are caught. In the second catch block, all exceptions that have Exception as a direct or indirect subclass are caught. It would seem that because all exceptions subclass the type Exception, the second catch block would process all exceptions. However, that s not how the catch mechanism works. When an exception is thrown, the individual catch blocks are sequentially iterated. For each block, .NET tests if the thrown exception has the exception type of the block as a direct or indirect subclass. Once the catch block makes a match, the catch block processes the exception and ignores all the other blocks. When writing your own catch blocks, the order is important. You order the blocks from specialized to generic. Going back to the preceding example, the exception IOException is specialized because IOException subclasses Exception. The simplest way to understand the catch blocks is to think of them as a huge switch statement, where Exception is the default.

Although that example is very simple, it should help to clarify the benefit of a separate rules engine Expanding on it slightly, any decision in a workflow that uses discrete data points as factors in the decision is a candidate for the Rules engine This would include, but is certainly not limited to Timeframes for reviewing documents Policy details for document retention, disposition, etc Approval paths for purchase requisitions, travel requests, etc Like many other things, there is more than one way to skin this cat Many factors will drive how you go about solving your particular problem As alluded to earlier, a close second to implementing rules is to simply collect the information on an association or initiation form, which we covered in 7 Honestly, this would certainly be easier to implement than a foray into the Rules engine.

Figure 1-4. Request/response architecture of graphical user interface (GUI) application talking to mainframe

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