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A atualização disponível nesta página destina-se a aplicativos que usam o Microsoft® Visual Basic® for Applications (VBA). Se você é usuário do Microsoft Office 2000 ou Microsoft Office XP, obtenha um patch para este problema no site Atualização do Office além de instalar este patch.
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- Overview
- When to use VBA and why
- VBA Programming 101
- Macros and the Visual Basic Editor
- Programming tips and tricks
- Going further with programming
- All of my Office applications: example code
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Are you facing a repetitive clean up of fifty tables in Word? Do you want a particular document to prompt the user for input when it opens? Are you having difficulty figuring out how to get your contacts from Microsoft Outlook into a Microsoft Excel spreadsheet efficiently?
You can perform these tasks and accomplish a great deal more by using Visual Basic for Applications (VBA) for Office—a simple, but powerful programming language that you can use to extend Office applications.
This article is for experienced Office users who want to learn about VBA and who want some insight into how programming can help them to customize Office.
The Office suite of applications has a rich set of features. There are many different ways to author, format, and manipulate documents, email, databases, forms, spreadsheets, and presentations. The great power of VBA programming in Office is that nearly every operation that you can perform with a mouse, keyboard, or a dialog box can also be done by using VBA. Further, if it can be done once with VBA, it can be done just as easily a hundred times. (In fact, the automation of repetitive tasks is one of the most common uses of VBA in Office.)
Beyond the power of scripting VBA to accelerate every-day tasks, you can use VBA to add new functionality to Office applications or to prompt and interact with the user of your documents in ways that are specific to your business needs. For example, you could write some VBA code that displays a pop up message that reminds users to save a document to a particular network drive the first time they try to save it.
This article explores some of the primary reasons to leverage the power of VBA programming. It explores the VBA language and the out-of-the-box tools that you can use to work with your solutions. Finally, it includes some tips and ways to avoid some common programming frustrations and missteps.
Automation and repetition
VBA is effective and efficient when it comes to repetitive solutions to formatting or correction problems. For example, have you ever changed the style of the paragraph at the top of each page in Word? Have you ever had to reformat multiple tables that were pasted from Excel into a Word document or an Outlook email? Have you ever had to make the same change in multiple Outlook contacts? If you have a change that you have to make more than ten or twenty times, it may be worth automating it with VBA. If it is a change that you have to do hundreds of times, it certainly is worth considering. Almost any formatting or editing change that you can do by hand, can be done in VBA.
Extensions to user interaction
There are times when you want to encourage or compel users to interact with the Office application or document in a particular way that is not part of the standard application. For example, you might want to prompt users to take some particular action when they open, save, or print a document.
Interaction between Office applications
Do you need to copy all of your contacts from Outlook to Word and then format them in some particular way? Or, do you need to move data from Excel to a set of PowerPoint slides? Sometimes simple copy and paste does not do what you want it to do, or it is too slow. Use VBA programming to interact with the details of two or more Office applications at the same time and then modify the content in one application based on the content in another.
Using code to make applications do things
You might think that writing code is mysterious or difficult, but the basic principles use every-day reasoning and are quite accessible. Microsoft Office applications are created in such a way that they expose things called objects that can receive instructions, in much the same way that a phone is designed with buttons that you use to interact with the phone. When you press a button, the phone recognizes the instruction and includes the corresponding number in the sequence that you are dialing. In programming, you interact with the application by sending instructions to various objects in the application. These objects are expansive, but they have their limits. They can only do what they are designed to do, and they will only do what you instruct them to do. For example, consider the user who opens a document in Word, makes a few changes, saves the document, and then closes it. In the world of VBA programming, Word exposes a Document object. By using VBA code, you can instruct the Document object to do things such as Open, Save, or Close. The following section discusses how objects are organized and described.
The Object Model
Developers organize programming objects in a hierarchy, and that hierarchy is called the object model of the application. Word, for example, has a top-level Application object that contains a Document object. The Document object contains Paragraph objects and so on. Object models roughly mirror what you see in the user interface. They are a conceptual map of the application and its capabilities. The definition of an object is called a class, so you might see these two terms used interchangeably. Technically, a class is the description or template that is used to create, or instantiate, an object. Once an object exists, you can manipulate it by setting its properties and calling its methods. If you think of the object as a noun, the properties are the adjectives that describe the noun and the methods are the verbs that animate the noun. Changing a property changes some quality of appearance or behavior of the object. Calling one of the object methods causes the object to perform some action. The VBA code in this article runs against an open Office application where many of the objects that the code manipulates are already up and running; for example, the Application itself, the Worksheet in Excel, the Document in Word, the Presentation in PowerPoint, the Explorer and Folder objects in Outlook. Once you know the basic layout of the object model and some key properties of the Application that give access to its current state, you can start to extend and manipulate that Office application with VBA in Office.
Methods
In Word, for example, you can change the properties and invoke the methods of the current Word document by using the ActiveDocument property of the Application object. This ActiveDocument property returns a reference to the Document object that is currently active in the Word application. "Returns a reference to" means "gives you access to." The following code does exactly what it says; that is, it saves the active document in the application. Read the code from left to right, "In this Application, with the Document referenced by ActiveDocument, invoke the Save method." Be aware that Save is the simplest form of method; it does not require any detailed instructions from you. You instruct a Document object to Save and it does not require any more input from you. If a method requires more information, those details are called parameters. The following code runs the SaveAs method, which requires a new name for the file. Values listed in parentheses after a method name are the parameters. Here, the new name for the file is a parameter for the SaveAs method.
Now that you know something about how Office applications expose their object models, you are probably eager to try calling object methods, setting object properties, and responding to object events. To do so, you must write your code in a place and in a way that Office can understand; typically, by using the Visual Basic Editor. Although it is installed by default, many users don't know that it is even available until it is enabled on the ribbon.
All Office applications use the ribbon. One tab on the ribbon is the Developer tab, where you access the Visual Basic Editor and other developer tools. Because Office does not display the Developer tab by default, you must enable it by using the following procedure:
Start with examples
The VBA community is very large; a search on the Web can almost always yield an example of VBA code that does something similar to what you want to do. If you cannot find a good example, try to break the task down into smaller units and search on each of those, or try to think of a more common, but similar problem. Starting with an example can save you hours of time. That does not mean that free and well-thought-out code is on the Web waiting for you to come along. In fact, some of the code that you find might have bugs or mistakes. The idea is that the examples you find online or in VBA documentation give you a head start. Remember that learning programming requires time and thought. Before you get in a big rush to use another solution to solve your problem, ask yourself whether VBA is the right choice for this problem.
Make a simpler problem
Programming can get complex quickly. It's critical, especially as a beginner, that you break the problem down to the smallest possible logical units, then write and test each piece in isolation. If you have too much code in front of you and you get confused or muddled, stop and set the problem aside. When you come back to the problem, copy out a small piece of the problem into a new module, solve that piece, get the code working, and test it to ensure that it works. Then move on to the next part.
Bugs and debugging
There are two main types of programming errors: syntax errors, which violate the grammatical rules of the programming language, and run-time errors, which look syntactically correct, but fail when VBA attempts to execute the code. Although they can be frustrating to fix, syntax errors are easy to catch; the Visual Basic Editor beeps and flashes at you if you type a syntax error in your code. For example, string values must be surrounded by double quotes in VBA. To find out what happens when you use single quotes instead, return to the Visual Basic Editor and replace the "Wow!" string in the code example with 'Wow!' (that is, the word Wow enclosed in single quotes). If you choose the next line, the Visual Basic Editor reacts. The error "Compile error: Expected: expression" is not that helpful, but the line that generates the error turns red to tell you that you have a syntax error in that line and as a result, this program will not run. Choose OK and change the text back to"Wow!". Runtime errors are harder to catch because the programming syntax looks correct, but the code fails when VBA tries to execute it. For example, open the Visual Basic Editor and change the Value property name to ValueX in your Macro, deliberately introducing a runtime error since the Range object does not have a property called ValueX. Go back to the Excel document, open the Macros dialog box and run Macro1 again. You should see a Visual Basic message box that explains the run-time error with the text, "Object doesn't support this property of method." Although that text is clear, choose Debug to find out more. When you return to the Visual Basic Editor, it is in a special debug mode that uses a yellow highlight to show you the line of code that failed. As expected, the line that includes the ValueX property is highlighted. You can make changes to VBA code that is running, so change ValueX back to Value and choose the little green play button underneath the Debug menu. The program should run normally again. It's a good idea to learn how to use the debugger more deliberately for longer, more complex programs. At a minimum, learn a how to set break-points to stop execution at a point where you want to take a look at the code, how to add watches to see the values of different variables and properties as the code runs, and how to step through the code line by line. These options are all available in the Debug menu and serious debugger users typically memorize the accompanying keyboard shortcuts.
Variables
In the simple examples in this article you manipulated objects that the application had already created. You might want to create your own objects to store values or references to other objects for temporary use in your application. These are called variables. To use a variable in VBA, must tell VBA which type of object the variable represents by using the Dim statement. You then set its value and use it to set other variables or properties.
Branching and looping
The simple programs in this article execute one line at a time, from the top down. The real power in programming comes from the options that you have to determine which lines of code to execute, based on one or more conditions that you specify. You can extend those capabilities even further when you can repeat an operation many times. For example, the following code extends Macro1. Type or paste the code into the Visual Basic Editor and then run it. Follow the directions in the message box that appears and change the text in cell A1 from Wow! to Yes! and run it again to see the power of looping. This code snippet demonstrates variables, branching and looping. Read it carefully after you see it in action and try to determine what happens as each line executes.
Create an email in Outlook
Be aware that there are situations in which you might want to automate email in Outlook; you can use templates as well.
Delete empty rows in an Excel worksheet
Be aware that you can select a column of cells and run this macro to delete all rows in the selected column that have a blank cell.
Delete empty text boxes in PowerPoint
Be aware that this code loops through all of the slides and deletes all text boxes that don't have any text. The count variable decrements instead of increments because each time the code deletes an object, it removes that object from the collection, which reduces the count.
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VBA é a sigla de Visual Basic for Applications, ou Visual Basic para Aplicações; ela é a linguagem de programação utilizada pelos softwares que compõem a suíte de escritório Microsoft...
