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Most of GUI programming is devoted to handling events through callbacks from the graphical interface. Events are described in 8. To display a message box containing the "Hello, World!" string, you have to configure the button so that when its Click event is fired, a function is called. In the example, you pass a function to the Add method for the button s Click event, which adds an event handler to an event source. You then add the button to the form and call the form s Show method to display it. Note that this code should be executed using fsi.exe. It won t run as a stand-alone application unless you add the following line at the end: Application.Run(form) This line relates to the event loop of a GUI application, and it s required to handle events such as button clicks. Moreover, if you execute the compiled program, notice that the window uses the classic Windows look and feel rather than the more fashionable look and feels featured by recent versions of Windows. This can be easily addressed by adding the following call to the EnableVisualStyles static method, right after the open statement: Application.EnableVisualStyles() If you use fsi.exe, both visual styles and the event loop are handled by F# Interactive.

The PATH environment variable or a data file distributed with your application. An icon data resource decoded to a System. Drawing.Icon value. The ResGen.exe tool can generate strongly typed APIs for common Windows resources such as bitmaps and icons. A bitmap added as a resource to a Windows Forms application or an error message from a compiler.

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You may be wondering why I have included debugging methods that some may suggest are old school and not the latest vogue interactive development trend. I submit it is possible to argue that one debugging method is better than another in certain circumstances or even in the general case. However, it is true that any of the methods presented here, and potentially many others, can lead to successful results. Organizations should not force developers into a particular mold of do it this way (which applies to more than just debugging) because what works well for one instance or person may not work for others. My recommendation is to adopt whatever debugging tools or methods you feel best meet your needs and project. If that means using a trace-like method or an interactive method, it doesn t matter as long as you can efficiently and effectively debug your project. If you develop good troubleshooting skills and can get the information you need to discover the problem, how you get there shouldn t matter.

Graphical applications are built on the abstractions provided by the graphical environment hosting them The application must interact with its environment and process input in an unstructured way User input isn t the only kind of input received from a windowing system Window management often involves requests to or from the application itself, such as painting or erasing a form Windowing systems provide a common and abstract way to interact with a graphical application: the notion of an event When an event occurs, the application receives a message in the message queue with information about the event The graphical application is responsible for delivering messages from the message queue to the control for which they re meant A set of functions provided by the API of the windowing system supports this.

A string, font, icon, bitmap, image, sound, or other binary resource that is attached to a Windows application or DLL using the Win32 .res format or .NET managed .resx format. Often dependent on language/culture settings.

You may have excellent debugging skills debugging your own applications, some of which may indeed be quite large. However, few have the opportunity to attempt to debug a large system like MySQL. While it isn t difficult, I have found many challenges during my work with the source code. I hope that the following sections give you the knowledge that I gained through my many trials. I encourage you to read through this section at least once and then follow my examples when you have time. I ll begin by examining a debugging session with an example of debugging MySQL using inline debugging statements. I ll then move on to an error handler example followed by an indepth look at debugging MySQL on both Linux and Windows. If you have been waiting for a chance to get your hands dirty with the MySQL source code, this section is for you. Roll up those sleeves and grab some of your favorite caffeine-laden beverage, because we re going in!

This activity of reading messages from the message queue and dispatching them is known as the event loop of the application If the loop fails for any reason, the GUI components cease to work, the application hangs, and Windows may eventually inform you that the application isn t responding It s rare for an application to program the event loop explicitly Programming toolkits encapsulate this functionality because it s basically always the same The Run method of the Application class is responsible for handling the event loop, and it ensures that messages related to events are delivered to targets within the application GUI programs often involve multiple threads of execution 13 discusses threading and concurrency in more detail; for this chapter, it s important to remember that event dispatching is a single-threaded activity, even if it may seem the opposite.

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