qr code generator api c# FIGURE 26-1 The skeletal formbased window in Visual C#.NET

Creation QR Code in Visual C#.NET FIGURE 26-1 The skeletal formbased window

FIGURE 26-1 The skeletal formbased window
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26:
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Use SystemWindowsForms
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Text is inherited from Control Next is the Main( ) method, which is declared much like the Main( ) methods found throughout the rest of this book It is the method at which program execution begins Notice, however, that it is preceded by the STAThread attribute As a general rule, the Main( ) method of a Windows program should have this attribute It sets the threading model for the program to a single-threaded apartment (STA) (A discussion of threading models and apartments is beyond the scope of this chapter, but briefly, a Windows application can use one of two different threading models: single-threaded apartment or multithreaded apartment) Inside Main( ), a WinSkel object called skel is created Then, the static method ApplicationEnableVisualStyles( ) is called This method enables visual styles (themes) if the operating system supports it It s not technically necessary in a Windows Forms application, but should be used because it enables better looking controls It should be the first method called by Main( ) The Application class is defined within SystemWindowsForms, and it encapsulates aspects common to all Windows applications Next, skel is passed to the Run( ) method, which is another method defined by the Application class, as shown here:
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ApplicationRun(skel);
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PART II
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This starts the window running The Run( ) method used by the skeleton is shown here: public static void Run(Form form) It takes a reference to a form as a parameter Since WinSkel inherits Form, an object of type WinSkel can be passed to Run( ) When the program is run, it creates the window shown in Figure 26-1 The window has the default size and is fully functional It can be resized, moved, minimized, maximized, and closed Thus, the basic features needed by nearly all windows were achieved by writing only a few lines of form-based code In contrast, the same program written using the C language and directly calling the Windows API would have required approximately five times as many lines of code! The preceding skeleton defines the outline that most form-based Windows applications will take In general, to create a form, you create a class that inherits Form Initialize the form to meet your needs, create an object of your derived class, and then call ApplicationRun( ) on that object
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Compiling the Windows Skeleton
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You can compile a Windows program using either the command-line compiler or Visual Studio For the very short programs shown in this chapter, the command-line compiler is the easiest way; but for real applications, you will probably want to use the IDE (Also, as explained at the start of this chapter, you will probably want to use the design tools provided by Visual Studio, but that is not the approach described here) Each way is shown here
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Compiling from the Command Line
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Assuming that you call the skeleton WinSkelcs, then to compile the skeleton from the command line, use this command:
csc /t:winexe WinSkelcs
The /t:winexe switch tells the compiler to create a Windows application rather than a console program To run the program, simply enter WinSkel at the command line
Part II:
Exploring the C# Library
Compiling from the IDE
To compile the program using the Visual Studio IDE, first create a new Windows Application project Do this by selecting File | New Project Then select Windows Forms Application in the New Project dialog box Call the project WinSkel Delete all C# source code files that were automatically created Next, right-click on the WinSkel project name and select Add and then select New Item From the Add New Item dialog box, select C# Code File, and name the file MyWinProjectcs Now, enter the skeleton code exactly as shown, and then build the solution To run the project, select Debug | Start Without Debugging
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