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Lesson Summary
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QR Code Reader In Visual Basic .NET
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Use the TextReader and TextWriter, BinaryReader and BinaryWriter, and StringReader and StringWriter classes to read and write text files, binary files, and strings (respectively) as streams. Use the MemoryStream class to store a stream in memory. You can then call MemoryStream.WriteTo to save the stream to a file on the disk. Use the GZipStream and DeflateStream classes to read and write compressed data. Isolated storage, implemented in the System.IO.IsolatedStorage namespace, allows you to save files in a part of the file system that is managed by the .NET Framework.
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Recognizing Bar Code In VB.NET
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Lesson Review
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You can use the following questions to test your knowledge of the information in Lesson 2, Reading and Writing Files and Streams. The questions are also available on the companion CD if you prefer to review them in electronic form.
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Matrix Barcode Creator In Visual Basic .NET
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2
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NOTE
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Answers
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
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1. You want to create a stream that you can use to store a file temporarily while your application processes data. After all data processing is complete, you want to write it to the file system. It s important that you minimize the time that the file is locked. Which class should you use A. MemoryStream B. BufferedStream C. GZipStream D. FileStream 2. You want to read a standard text file and process the data as strings. Which classes can you use (Choose two. Each answer forms a complete solution.) A. GZipStream B. TextReader C. StreamReader D. BinaryReader 3. You need to store data to isolated storage in such a way that other applications that are run by the same user and other users running the same application cannot access the data directly. Which method should you call to create the IsolatedStorageFile object A. IsolatedStorageFile.GetUserStoreForAssembly() B. IsolatedStorageFile.GetMachineStoreForAssembly() C. IsolatedStorageFile.GetUserStoreForDomain() D. IsolatedStorageFile.GetMachineStoreForDomain()
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Making Quick Response Code In Visual C#.NET
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2 Review
Review
To practice and reinforce the skills you learned in this chapter further, you can perform any or all of the following: Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-word situations involving the topics of this chapter and ask you to create a solution. Complete the suggested practices Take a practice test.
Summary
The System.IO namespace provides classes for enumerating drives, managing files and folders, and responding to changes in the file system. Streams provide a flexible way to store data to files or memory. Using different types of streams, you can compress data or store it to isolated storage.
Key Terms
Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book. Deflate GZip Isolated storage
Case Scenarios
In the following case scenarios, you will apply what you ve learned about how to work with the file system and streams. You can find answers to these questions in the Answers section at the end of this book.
Case Scenario 1: Creating a Log File
You are an application developer for Contoso, Inc. To meet regulatory requirements, the financial application you developed must generate text-based log files for all transactions.
2 Review
A new file must be generated every day, and a copy of each file must be stored on a shared folder. Systems administrators from your accounting department need to have direct access to both the original and copy of each log file.
Questions
Answer the following questions for your manager. 1. Which class should you use to create the text log file 2. How can you copy the log file to the shared folder 3. Should you use isolated storage
Case Scenario 2: Compressing Files
You are an application developer working for Humongous Insurance. Your application records detailed transaction logs to the local file system. The transaction logs are accessed only from within your application. The size of the transaction logs can exceed more than 1 gigabyte (GB) per day. To reduce storage requirements, you would like to compress the transaction logs. Currently, you write to the transaction logs using the BinaryWriter class.
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