Error Handling and Debugging Tips and Techniques for Microsoft Access, VBA, and Visual Basic (VB6)by Luke Chung, President of FMS, Inc. This paper is featured on Experienced developers use a variety of techniques to simplify their coding and maintenance efforts. Some of the tricks are general. Visual Basic (VB6) and Microsoft Office/Access VBA. Hopefully, by adopting such .

Not. only can you reduce bugs during development, you can also significantly reduce the effort required to replicate and fix bugs your users encounter. A consistent coding style is critical for efficient application development in multi- developer environments. It also increases the. Introduction. Debugging is one of the most important skills for a developer. Software development is all about writing code, making mistakes, and. Strong debugging skills minimizes the development cycle by allowing developers to pinpoint bugs quicker, make fixes that actually.

This is particularly important as the code gets more complex. Debugging doesn. Having the proper error handling in place is critical to providing quick support. At the very least you want to verify it. If no error handling is in place, when an Access. End, Debug message box: Assuming you. The Microsoft Access/VB6 debugger lets you step through each line of code as it runs.

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By seeing how your code runs (which. IF statement branch is taken, how loops work, etc.) you gain a much better understanding of how your code work. Supporting Deployed Applications. By including a consistent error handler design with a central error handler, you can deploy applications that document the crashes your. This is particularly important if you have many remote customers and can. With a sophisticated error handler, you can document not only the error, but other important information such as the procedure name.

Access environment information. With this information you. Most importantly, you. By using a consistent error handler, you can make.

Basic error handling just hides the default. Advanced error handling can include all sorts of features such as saving information about the cause of the.

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Microsoft Access Runtime. If you are deploying Microsoft Access databases with the free runtime version (to users who don't own Microsoft Access), the. In such situations, you need to have an error handling system in place to capture errors and.

Visit our Microsoft Access Runtime Distribution and Free Downloads page for more info. Verify Error Handling Setting.

Before you can use error handling, you need to understand the Error Trapping setting. VB6/VBA lets you to determine how it should behave. From the IDE, look under the Tools Options setting. That setting will cause your code to stop on every error, even errors you are. During development, if Error Trapping is. This makes finding and fixing the problem a real pain. I recommend using .

However, be aware that this does not work if you use. Err. Raise command.

This command actually causes an . Unfortunately, VB6/VBA does not support a. You actually have. Without explicitly adding error handling, VB6/VBA shows its default. At the most basic level, error handling involves two parts. Error Enabler. This section invokes the error handler: On Error Go. To PROC. For consistency, use the same label.

Examine. the error object (Err) to see what occurred. For instance, Err. Number is. the error number, Err. Description is the error description, etc. For instance. you may want to see if a file exists. By looking for it and managing the. This is great for debugging.

However, if error handling exists in the. Error Handling section is invoked. This makes. debugging much more difficult.

An easy way to avoid this problem is to add a global constant or. So rather than. this: On Error Go. To PROC. That way, your users get the benefit of the. These are the. ones you should check: Number.

The error number, which is useful for testing. Zero means no error. Description. The built- in description of the error. Sometimes this doesn. For. instance, rather than a simple message that an error occurred, you can. Msg. Box . In such cases, use.

Clear method to clear the object: Err. Clear. Alternatively, you can set the error number to zero (Err. Number = 0). but is not as effective as the Clear method since it does not clear the. We. just want to delete it if it does. Therefore, the command to ignore the.

Resume Next) is appropriate. On Error Resume Next effectively disables error handling from that. It. should only be used before a line where a specific error is being. To reset error handling, use this line: On Error Go. To 0. Or, your standard error handler with an extra clause to handle. If gcf. Handle. Errors Then. On Error Go. To PROC.

That is, we consider it okay if the object. However, there are other reasons that may cause a. Technically, these are the only types of errors.

Access can crash with a GPF. If you. want to step into it line- by- line, press . More explanations on. Of course, running a procedure. If you. need to, consider using the Immediate Window.

Breakpoints. Breakpoints are placed on the lines in your code so the debugger is. A breakpoint can be. General. Declarations section, or lines that define variables in a procedure). Simply move your cursor. You can also use the.

Immediate Window or the other Watch windows to be described later to. The debugger gives you a variety of techniques to step through your.

Step Into . This is a real time saver if you don. The. command lets you run the procedure (and any procedures it may call), and.

This is basically a way to simplify the debugging process. This is extremely powerful. Retrieve it under View, Call Stack, or press .

Before analyzing the details of the current procedure, it may be. You can use the Immediate Window. Open the Immediate Window by. The. Immediate window lets you: Evaluate expressions unrelated to your code (e. For instance: ? 1.

Enter to see the value. If your code is currently running. This displays the entire list of. Dead Or Alive 5 Last Round Ps3 more. Local variables are variables.

This is an alternative to modifying values from. Immediate Window. Watch Window. The. Watch Window is similar to the Locals Window, but you specify the. You can track variables across modules and. Watch Window to see their value no. This can be. done by placing the cursor in the variable you want to track, and.

Debug, Add Watch, or from the right- click menu, selecting Add. Watch. This dialog appears: The current variable is added to the Expression section, and the.

Context sections. If you press. . The latter is particularly powerful when you are having. Maybe a variable is set in multiple places and you can.

By setting the Watch. Type option, you can quickly stop when this occurs. This is useful if you want to stop. For instance, enter this in the Expression. Counter = 5. 00and when the variable becomes 5. Writing Code for Debugging. So far, we. Some examples include.

Testing code. Debug. Print statements. Debug. Assert statements.

Stop statements. Testing Code. Sometimes using the Immediate Window is insufficient for testing a. Adobe Creative Suite 4 Windows 10. Maybe you want to test it multiple times and.

For. instance, if you are passing variables that get assigned values, that. Similarly, the procedure you. In these cases, it. This can be a real time saver if the code you are testing is.

For instance, if you. For instance, if you add this.

Debug. Assert x < > 5the debugger stops when x is 5. The equivalent to above would be: If x = 5 Then Stop. Stop statements are rare but some developers like to add it to the. Select Case statements for what should be an impossible branch: Select Case str. Type. Case . Far better to have an.

Advanced Error Handling. The error handling examples shown so far only manage errors in the. In a more complex application, a more advanced error. A single (global) error handler should. This section will reveal how your error handler can. The procedure name where the error occurred. The procedure call stack to see how the procedure was invoked.

The line number where the error occurred. Additionally, this information is written to a file on disk so you.

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