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Part 2: Visual Basic for Applications
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Microsoft Office Excel 2003 Programming Inside Out
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8 On the new menu, right-click the menu item you just renamed and click Assign Macro. Then, in the Assign Macro dialog box, click the name of the macro you want to assign to the menu item and click OK. 9 Click Close.
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Debugging a Macro
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Part of the art of writing and recording macros is debugging, or the process of discovering why your VBA code isn t working the way it should. The Visual Basic Editor provides quite a few tools for you to use in testing a macro you ve recorded or written. One interesting tech nique you can use to debug your code is to step through the code one instruction at a time.
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1 To start the process, click Tools, Macro, Macros, <macro_name>, Step Into to display the macro in the Visual Basic Editor. 2 From within the editor, press F8 to execute the next macro instruction. As shown in Figure 3-4, an arrow will appear beside the next instruction to be executed, and the instruction itself will be highlighted.
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Figure 3-9. The Visual Basic Editor shows you which line of code will be executed next.
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Subsequent presses of F8 will execute the highlighted step in the macro and highlight the next step, if any. There are a number of other ways you can control how your macro executes. Table 3-1 lists those keyboard shortcuts and offers a brief description of what each shortcut does.
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Part 2: Visual Basic for Applications
Exploring Visual Basic for Applications
Table 3-2. Keyboard Shortcuts for Executing Macro Steps in the Visual Basic Editor
Sequence
F5 F8 Shift+F8 Ctrl+Shift+F8 Ctrl+F8 Shift+F9 F9 Ctrl+Shift+F9 Ctrl+F9
Result
Runs the macro code. Executes the highlighted step in the macro code and moves the highlight to the next step in the code. Skips the highlighted step and moves the highlight to the next step in the code. Stops executing the macro code. Positions the cursor in the macro code; pressing Ctrl+F8 causes the editor to run the code until it reaches the cursor. Sets a quick watch to follow the value of a selected variable in the code. Inserts a breakpoint at the cursor, which will allow the code to exe cute to that point but then stop. Clears all breakpoints. Identifies the selected statement as the next statement to execute.
When your macro runs but doesn t produce the result you re expecting, it makes the most sense to have your macro code in one window and your worksheet in another, and to step through the macro one line at a time using F8. Skipping steps with Shift+F8 lets you bypass any instructions that you know aren t operating correctly, and if things aren t going right at all and you want to stop before anyone gets hurt, Ctrl+Shift+F8 lets you stop the whole pro cess. You don t undo any of the steps that occurred before you pressed Ctrl+Shift+F8, but you do prevent any additional code from running. Caution When you re running and re-running a macro, don t forget to undo the changes the macro made to your worksheet. If you don t, you won t see any changes the next time you run it. A breakpoint, by contrast, is a set stopping point that lets you run the code up to the breakpoint. You can continue past the breakpoint by pressing F5. As shown in Figure 3-5, the Visual Basic Editor indicates the presence of a breakpoint by putting a dot in the vertical bar at the left edge of the code window, and displaying the code in reverse video.
Part 2: Visual Basic for Applications
3
Microsoft Office Excel 2003 Programming Inside Out
Figure 3-10. Breakpoints let you run your code to a specific point before you step through it line by line.
3
Implementing Macro Security and Digital Signatures
Viruses and other forms of harmful software (sometimes called malware) are a fact of life you have to deal with when you work with a powerful and flexible programming language such as VBA. You should already have a virus checking program or two installed on each of your computers to act as the first line of defense against macro viruses (viruses written using a macro programming language), but new viruses pop up all the time and it s possible that your detection programs won t recognize newer threats. After your second line of defense, which is you casting a critical eye on every file you receive, expected or not, you have the Excel macro security settings. Tip
Avoid Running Auto Macros If you want Excel to start without running an Auto_Open macro, hold down the Shift key when you start the program.
The Excel macro security settings determine how permissive Excel should be about allowing macros to be run on your computer. There are three macro security settings: High, Medium, and Low, which you can control by clicking Tools, Options, Security, Macro Security to display the Security dialog box. You should cross the Low option off your list of acceptable macro security settings; even if you have an all-but-foolproof virus scanner, allowing even one virus to get through is one too many. No software can know what files you are or aren t expecting, so you need to make sure there s an active human in the security loop. That human is you.
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