if elif else and endif
The if elf else, and endif preprocessor directives are all used for conditional processing when your program is compiled.The f and elif both evaluate the symbols to determine whether they are defined or undefined. The else preprocessor directive allows for a compound conditional directive to be created. And finally, the endif preprocessor directive specifies the end of a conditional directive. Now for a little more detail on how these work.You can think of these directives as a typical if else...
C Jlb
BufferedStream bin new BufferedStream file BinaryReader din new BinaryReader bln It would be impossible to sandwich BinaryReader in the middle layer of these streams. In this respect, the C API has just a little more enforcement than the Java API. Table 11.7 shows the methods in BinaryReader and the corresponding methods in Java. Notice the method names for integers and floating point numbers seem quite general. For example, C uses ReadInt16 rather than ReadShort .This is because these classes...
Info Ebx
After clicking OK,Visual Studio.NET will take you to the source view page where you can start entering code.You'll notice that the helpful IDE automatically generates some skeleton code for you to get your application started. The skeleton code provides the basic structure for your console applications. It even starts the documentation for you because, as computer science professors like to remind us, Always document your code Don't worry too much about what all this skeleton code means, as...
Building a Web Service
Declaring your class as a Web service and having certain methods exposed and executed over the Web is fairly easy. In .NET, a Web service is as an ASP.NET file with an .asmx file extension.These files will contain the class and methods of an XML Web service.You can easily expose your program as a Web service by adding several lines and saving it as an .asmx file. For our example, we'll turn our Book_Details class into an XML Web service by exposing the GetBookTitleByID method as a Web method....
The implicit Operator
Earlier in this chapter we created a class called Prime that represents a prime number. Since all prime numbers are numbers, a conversion from Prime to any number type should be defined as an implicit cast. This will allow us to assign a Prime object value to a variable of type int, as follows Prime p new Prime 11 int x p Implicit cast In order to achieve this kind of behavior we must create an implicit conversion definition. The following definition will allow a Prime instance to be treated as...
Frequently Asked Questions Rkv
The following Frequently Asked Questions, answered by the authors of this book, are designed to both measure your understanding of the concepts presented in this chapter and to assist you with real-life implementation of these concepts. To have your questions about this chapter answered by the author, browse to www.syngress.com solutions and click on the Ask the Author form. Q How do I define global constants in C A It is common practice to create a class with nothing but constant members....
Windows Form Class Hierarchy
The System.Windows.Forms namespace also known as the WinForms namespace provides the necessary classes for implementing forms and the various controls that can be placed onto these forms. Figure 12.1 shows some of the major classes within the Windows Form class hierarchy. Figure 12.1 Windows Form Class Hierarchy As you can see, this is very similar to Java's AWT Swing hierarchy where similar objects are derived fromjava.lang.Object.The Form class in C is similar to the Applet class in Java,...
BufferedStream
The previous section showed how to manually buffer an individual binary file. Most Java programmers are aware of BufferedInputStream and BufferedOutputStream from Java. C contains this functional layer in one class, BufferedStream.The use of BufferedStream should be very familiar to Java programmers since it is so similar. Buffering is added to a stream by accepting a Stream object in the BufferedStream constructor.The new BufferedStream object will provide buffering automatically, on the fly....
Runtime Callable Wrappers
The semantics of object creation and maintenance are very different under COM and .NET. In order to invoke a COM component we need to know the class IDs and interface IDs of the component.We also need to call the AddRef and Release methods on the COM component to maintain its lifetime.The AddRef method allocates memory for a COM component and the Release method will release the memory resources. Unfortunately managed components are not aware of the IUnknown interface and it is not practical for...