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Encode QR Code ISO/IEC18004 in Visual C# Lesson Review

Lesson Review
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Decoding QR Code JIS X 0510 In Visual C#.NET
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You can use the following questions to test your knowledge of the information in Lesson 3, Using Unmanaged Code. The questions are also available on the companion CD if you prefer to review them in electronic form.
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Bar Code Recognizer In Visual C#.NET
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13
QR Code ISO/IEC18004 Creator In VS .NET
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Painting Denso QR Bar Code In VS .NET
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Interoperation
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Bar Code Encoder In Visual C#.NET
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NOTE Answers
UCC.EAN - 128 Creation In C#.NET
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UPC Code Encoder In C#.NET
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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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Paint USS Codabar In C#.NET
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1. Which of the following choices is true regarding Platform Invoke A. The DllImport attribute should be used. B. A Runtime Callable Wrapper can be used instead of P/Invoke, which will wrap all the needed functionality of the library. C. If a parameter has no meaningful value, it s best to leave it out of the call. D. String objects are preferred to StringBuilder objects because Strings are reference types. 2. You need to use a structure for a given P/Invoke call. What should you do (Choose all that apply.) A. Define the structure in your .NET code first. B. Use the SizeOf method of the System.Runtime.Marshal class if the size of the structure is needed. C. Use the StructLayout attribute if positioning within the structure is important. D. Create a new structure, and use the Type Library Exporter to create a type library. Reference this from your assembly, and it will serve as the necessary proxy for your Structure. 3. What purpose does the MarshalAs attribute serve (Choose all that apply.) A. Allows mapping between pre-existing types and current .NET types where mismatches exist. B. It is necessary for correct data marshaling for all P/Invoke calls. C. It allows missing types to simply be ignored by the runtime when calls are made. D. It can be used to explicitly indicate what types are being moved around
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Print 1D In .NET
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13 Review
QR Code Recognizer In None
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UPC-A Supplement 2 Scanner In Visual C#.NET
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Review
Generating Data Matrix ECC200 In VS .NET
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Data Matrix 2d Barcode Encoder In None
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To further practice and reinforce the skills you learned in this chapter, you can perform the following tasks:
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Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involving the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.
Summary
Because of its dependence on the Windows registry, COM Interop limits the platforms an application can run on. The TlbImp.exe tool is a command-line mechanism you can use to import a COM component. The default behavior when catching System.Exception objects now catches both CLS-compliant and non-CLS-compliant exceptions. The ComVisible attribute can be set to apply to an entire assembly, an entire class, or individual members. To use P/Invoke, you use the DllImport attribute and the name of the DLL you are referencing. You must use the private and static/shared attributes for P/Invoke calls.
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.
CLS-compliant exception COM (Component Object Model) COM Callable Wrapper (CCW) Interop
13 Review
managed code marshaling memory leak Platform Invoke Runtime Callable Wrapper (RCW) Type Library Exporter Type Library Importer type safety
Case Scenario: Incorporating Legacy Code into a .NET Project
In the following case scenario, you will apply what you ve learned about how to use the System.Runtime.InteropServices namespace. You can find answers to these questions in the Answers section at the end of this book. A common problem when a project is moved to the .NET Framework is rewriting large amounts of legacy code. In this scenario, a company is trying to port an application to the .NET Framework, but it has a huge existing code base of fully developed and fully tested code.
Interviews
Following is a list of company personnel interviewed and their statements:
IT Department Head
Since we ve started using .NET, our developers have been more productive than ever. Based on this productivity increase, we ve adjusted our priorities so that a full system rewrite will be done for our two flagship products, WinformsProduct and WebProduct. Since both products share the same business and data access layers currently, the same should be the case with the new products. We have a tremendous investment in our COM libraries and while we want full rewrites of each, we need to get out what we can as quickly as we can. Hence, we re going to rewrite our business and data access libraries one at a time. We still have some new feature requests that will be included in our existing applications but this shouldn t be a problem since we heard that COM components will be able to consume our .new .NET libraries.
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