Developing Your Applications Interactively in Word

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Developing Your Applications Interactively
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In more-traditional development environments, most developers follow a distinct three-step process: writing, compiling, and testing. However, VBA uses a more interactive approach to development that makes it easier for both beginning and experienced developers. Languages such as C++ require you to write all the code then compile it. During the compile, you may uncover numerous errors, from simple typing errors to more-complex syntax errors. The Visual Basic programming environment, on the other hand, interprets your code every line of the way, alerting you to potential problems now instead of during a lengthy compile cycle. Because Visual Basic is partially compiling your code as you type it, it takes very little time to finish compiling the code and execute your application. Unlike with other languages, you will find that you are constantly writing, executing, and refining your application. In addition, the Visual Basic environment employs a graphical environment. You most often work in the graphical interface first and on the code second. This lets you spend more time creating and less time compiling and recompiling.
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Starting the Editor
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One of the first questions that you will face is How do I enter source code (structured commands) or develop a user interface (forms or dialog boxes) The answer is the IDE, a graphical user interface you use to develop applications. It is similar to development environments provided in other applications, such as Microsoft Access and Microsoft Excel. To display the VBAIDE, choose Tools Macro Visual Basic Editor or press Alt+F11. Alternatively, you can start the editor by typing VBAIDE at the AutoCAD command prompt, as shown in Figure 1-1.
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CHAPTER 1 THE VBA INTEGRATED DEVELOPMENT ENVIRONMENT (VBAIDE)
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Figure 1-1. The AutoCAD command prompt
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Note AutoCAD includes a Visual Basic menu and toolbar. You can load it by copying ACAD.DVB from
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\Sample\VBA\VBAIDEMenu (in the AutoCAD folder) to a directory in your support path. The toolbar will then autoload when the first VB command is launched. If you already have an ACAD.DVB, you can cut and paste from the provided ACAD.DVB to your own. This provides an AutoCAD toolbar for the following commands: VBAIDE, VBAPREF, VBAMAN, VBALOAD, and VBARUN. This also adds New, Open, and Close to the File pulldown on the VBAIDE toolbar.
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Exploring the User Interface
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The editor is composed of several different windows. The first time you open it, it looks like Figure 1-2. Use the View menu to control which windows are visible. To get context-sensitive help on any window, click in it and press F1. The rest of this section discusses the most frequently used windows.
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Figure 1-2. The AutoCAD VBAIDE
CHAPTER 1 THE VBA INTEGRATED DEVELOPMENT ENVIRONMENT (VBAIDE)
The Project Explorer
The Project Explorer window displays a hierarchical view called a treeview of your project s components that are loaded in the IDE. The view lists all of the UserForms, code, and class modules associated with each project. Use this window to keep track of and move components between projects. Figure 1-3 shows what a typical Project Explorer window looks like. As you add, create, and remove files, the Project Explorer reflects those changes. You can save each project with a .dvb extension or you can embed it directly into a drawing file. You can t delete the required ThisDrawing object, which represents the active drawing, but nothing requires you to place code in this module. You can close the Project Explorer window to gain more space in the IDE. To reopen it, choose View Figure 1-3. Project properties Project Explorer or press Ctrl+R.
The Code Window
The Code window is where you ll do most of your development work to manipulate AutoCAD. You can have a window open for each module in the project, as shown in Figure 1-4.
Figure 1-4. Cascaded VBAIDE windows
Alternatively, you can see one window at a time by clicking the window s maximize button, shown in Figure 1-5, which is in its upper-right corner.
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