This chapter is intended for those who are not familiar with Excel and the Excel macro recorder, or who are inexperienced with programming using the Visual Basic language. If you are already comfortable with navigating around the features provided by Excel, have used the macro recorder, and have a working knowledge of Visual Basic and the Visual Basic Editor, you might want to skip straight to Chapter 2.
If this is not the case, this chapter has been designed to provide you with the information you need to be able to move on comfortably to the more advanced features presented in the following chapters. Specifically, this chapter covers the following topics:
□ The Excel macro recorder
□ User-defined functions
□ The Excel object model
□ VBA programming concepts
Excel VBA is a programming application that allows you to use Visual Basic code to run the many features of the Excel package, thereby allowing you to customize your Excel applications. Units of VBA code are often referred to as macros. More formal terminology is covered in this chapter, but you will continue to see the term macro as a general way to refer to any VBA code.
In your day-to-day use of Excel, if you carry out the same sequence of commands repetitively, you can save a lot of time and effort by automating those steps using macros. If you are setting up an application for other users who don't know much about Excel, you can use macros to create buttons and dialog boxes to guide them through your application as well as automate the processes involved.
If you are able to perform an operation manually, you can use the macro recorder to capture that operation. This is a very quick and easy process and requires no prior knowledge of the VBA language. Many Excel users record and run macros and feel no need to learn about VBA.
However, the recorded results might not be very flexible, in that the macro can only be used to carry out one particular task on one particular range of cells. In addition, the recorded macro is likely to run much more slowly than code written by someone with knowledge of VBA. To set up interactive macros that can adapt to change and also run quickly, and to take advantage of more advanced features of Excel such as customized dialog boxes, you need to learn about VBA.
Don't get the impression that we are dismissing the macro recorder. The macro recorder is one of the most valuable tools available to VBA programmers. It is the fastest way to generate working VBA code, but you must be prepared to apply your own knowledge of VBA to edit the recorded macro to obtain flexible and efficient code. A recurring theme in this book is recording an Excel macro and then showing how to adapt the recorded code.
In this chapter, you learn how to use the macro recorder and you see all the ways Excel provides to run your macros. You see how to use the Visual Basic Editor to examine and change your macros, thus going beyond the recorder and tapping into the power of the VBA language and the Excel object model.
You can also use VBA to create your own worksheet functions. Excel comes with hundreds of built-in functions, such as SUM and IF, which you can use in cell formulas. However, if you have a complex calculation that you use frequently and that is not included in the set of standard Excel functions — such as a tax calculation or a specialized scientific formula—you can write your own user-defined function.
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