n n n n n in Visual Basic .NET

Creator QR Code in Visual Basic .NET n n n n n
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Making Barcode In VB.NET
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Files, Streams and Serialization
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In this chapter you will read: why persistence is an important issue in programming, and why NET provides so many competing persistence mechanisms; how to store application settings or data into the Windows Registry; what les are and the core mechanisms that a programmer can access to deal with le storage and retrieval; about different types of le and ways of creating, writing to and reading from les; what a stream is, and how objects can be serialized on to a stream for storage or transport; what XML is, why it is a central mechanism that NET relies on, and how to create, read and write XML data
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Storing Application Data
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1111 Off-Line Storage
Bar Code Creator In Visual Basic .NET
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Computers would be reduced to the level of mere machinery if it were not for the availability of off-line storage, the mechanisms that allow programs to be stored for later use and the mechanisms for storing their data to and retrieving it from storage devices Computer main memory, the type that programs run in, is volatile If the computer s power is switched off, it forgets everything in its main memory (in almost all computers, a small amount of memory, no more than a few variables worth, is used to store settings that must persist while the power is off) When you use a word processor or a spreadsheet program, you expect that the documents you created yesterday will be available for editing and printing In fact all but the most trivial programs that you use would be completely useless were it not for the facility to retrieve data that you had previously created, or move data from another source on to your computer A generic name for the facility to store data off-line (ie while the computer is switched off) and retrieve it again is persistence, and in a modern PC there are often several mechanisms that make this possible The PC I am working on as I write this has a oppy disk drive that can accommodate a fairly small amount of data by
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11 n Files, Streams and Serialization
Code39 Maker In VB.NET
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today s standards, a xed disk drive (or hard disk drive) that can cope with a huge amount of data (which in a few years time will almost certainly be considered to be a trivial amount), and a CD read/write drive that allows me to store signi cant amounts of data on to removable media It also has a small memory-card reader that I use to transfer photographs from my digital camera, and I use a small data-pen type device to make quick backup copies of documents I m working on to transfer to a laptop PC While these devices are based on widely different storage technologies, my PC recognizes all of them as le-storage devices and mostly treats them as equals in terms of how to read data from them and write data to them Obviously, the computer s operating system is doing a lot of work on my behalf to make it as easy as possible to store data off-line and retrieve it again A program often needs to store several types of data to do its work A quick look at Visual Studio should convince you of that Every program that you create will occupy several les on your computer s hard disk drive These les will hold the program code and form designs, translated versions of these for use by the NET framework, plus any settings that have been made for the program, such as the name of the start-up form In addition, Visual Studio stores data for its own purposes; how you have set up VS in the Tools/Options dialog box, which add-ins have been made available, how you have the various windows organized on the screen, etc Any non-trivial program that you write will create data that you will need to store off-line to save the user having to re-enter it the next time the program is run All of this data can be saved in les, and can be retrieved either automatically or on demand when the program is run at a later date
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DataMatrix Reader In .NET
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