Handling Errors in Code

We discussed the various types of errors in Chapter 3, but we have scrupulously avoided the question of how to handle run-time errors in code. Indeed, VBA provides several tools for handling errors (On Error, Resume, the Err object, and so on), and we could include an entire chapter on the subject in this book.

Proper error handling is extremely important. Indeed, if you are, or intend to become, a professional application developer, you should familiarize yourself with error-handling procedures.

On the other hand, if your intention is to produce Excel VBA code for your own personal use, the reasons for adding error-handling routines are somewhat mitigated. When an error occurs within one of your own programs, VBA will stop execution, display an error message, and highlight the offending code. This should enable you to debug the application and fix the problem. (It would be unreasonable to expect another user of your program to debug your code, however.)

Let us undertake a brief discussion of the highlights of error handling. (For more details, may I suggest my book Concepts of Object-Oriented Programming in Visual Basic, published by Springer-Verlag. It has a detailed chapter on error handling.)

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