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Before we begin, an important point needs to be made Visual Studio includes a sophisticated set of design tools that automate much of the process of creating a Windows application Using these tools, you can visually construct and position the various controls and menus used by your application Visual Studio will also rough in the classes and methods that are needed for each feature Frankly, using the Visual Studio design tools are a good choice for creating most real-world Windows applications However, there is no requirement that you use those tools You can also create a Windows program by using a text editor and then compiling it, just like you can do for console-based applications Because this book is about C#, not Visual Studio, and because the Windows programs contained in this chapter are quite short, all programs will be shown in a form in which they can be entered using a text editor However, the general structure, design, and organization of the programs is the same as that created by the design tools Thus, the material in this chapter applies to either approach

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This can be seen in Fig 820 which shows the solution curves for n for different (r/d ) ratios It can also be observed in this gure that the region bounded by the two solution curves for one value of the (r/d ) ratio contains similar curves of a larger ratio As mentioned earlier a larger value of (r/d ) implies better transmission Therefore, the region between two solution curves can be used to specify the angular velocity ratio n so that the transmission index (r/d ) is larger than a minimum speci ed value This is a useful feature in designing the mechanism 3 Figure 821 shows the solutions curves for n for a xed ratio of (r/d ) and varying ratios of (d/a) It can be seen that n = 0 occurs at the same two points This is also evident from Eq (827) if we substitute n = 0 and solve for q n = 0 q = sin -1 (r d ) or p - sin -1 (r d ) (830)

The first thing that you must learn about Windows programming is how the user and Windows interact because this defines the architecture that all Windows programs share This interaction is fundamentally different from the console-based programs shown in the other parts of this book When you write a console program, it is your program that initiates interaction with the operating system For example, it is the program that requests such

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which is clearly independent of the ratio (d/a) This feature of the design (see Eq [827]) has an important signi cance if a long dwell or reversal of motion of the cam is desired That is, if we specify a lower bound on the transmission index (r/d ), then the permissible region for n has zero or a negative value over only a limited range of q For example, the maximum possible single dwell in the initial traversal of the roller on the cam is (p - 2sin-1(r/d )) It should be noted that this is a minimum value of r here, not r generically Thus, the ratio is useful not only to achieve a prescribed minimum

things as input and output by calling Read( ) or WriteLine( ) Thus, console programs call the operating system The operating system does not call your program However, in large measure, Windows works in the opposite way It is Windows that calls your program The process works like this: A program waits until it is sent a message by Windows Once a message is received, your program is expected to take an appropriate action Your program may call a method defined by Windows when responding to a message, but it is still Windows that initiates the activity More than anything else, it is the message-based interaction with Windows that dictates the general form of all Windows programs There are many different types of messages that Windows may send to your program For example, each time the mouse is clicked on a window belonging to your program, a mouse-clicked message will be sent Another type of message is sent when a button is pressed or when a menu item is selected Keep one fact firmly in mind: As far as your program is concerned, messages arrive randomly This is why Windows programs resemble interrupt-driven programs You can t know what message will be next

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At the core of a C# Windows program is the form A form encapsulates the basic functionality necessary to create a window, display it on the screen, and receive messages A form can represent any type of window, including the main window of the application, a child window, or even a dialog box When a form is first created, it is empty To supply functionality, you add menus and controls, such as pushbuttons, lists, and check boxes Thus, you can think of a form as a container for other Windows objects When a message is sent to the window, it is translated into an event Therefore, to handle a Windows message, you will simply register an event handler for that message with the form Then, whenever that message is received, your event handler is automatically called

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