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Figure 22-8. Setting a watch for when a variable s value changes.
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In the Expression text box, enter the name of the variable you want the code to watch. In this case, you want to watch when the variable gintDontShowContactList changes. You don t know where the variable is set, so set the Procedure and Module selections to (All Procedures) and (All Modules), respectively. Select the Watch Type option to Break When Value Changes, and click OK to set the watch. Go to the Immediate window and set gintDontShowContactList to True by entering gintDontShowContactList = 1 and pressing Enter. Now return to the Database window and start the application by opening the frmSplash form. (Code in the Load event of this form hides the Database window and then opens the LawTrack Contacts Sign On form.) 771
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Part 1: Part Title
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Part 5: Automating an Access Application
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Microsoft Office Access 2003 Inside Out Because you set a watch to halt when gintDontShowContactList changes, the code execution should halt in the module for the frmSignOn form as shown in Figure 22-9. (I closed the Project Explorer and Properties window so that I could see the Code window without these windows in the way.)
Part 1: Part Title
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Figure 22-9. Visual Basic code halted immediately after a watch variable has changed.
Note that the code halts on the statement immediately after the one that reset the watched variable. If you didn t set the variable to True before you started the application, Visual Basic won t halt because the value won t be changing. Click the Continue button to let the code continue executing. Return to the Access window, and in the LawTrack Contacts Sign On dialog box, choose my name (John Viescas) and press Enter or click the Sign On button. The sign on dialog box will close, and the main switchboard form opens. In the main switchboard, click the Users button to open the user edit form. The first and only record should be my record unless you ve created other users. Select the Don t Show Contact List option in my record and click the Save button. The procedure halts again, as shown in Figure 22-10. It appears that this code is setting the gintDontShowContactList variable to some value on the user edit form. (As you ll learn later, Me is a shorthand way to reference the form object where your code is running, so Me.DontShowContactList references a control on the form.) Click the Continue button again to let the code finish execution. Return to the Microsoft Access window and click the Close button on the Users form to return to the main switchboard. If you open frmUsers in Design view (you can t do this while the procedure is still halted) and examine the names of the check box controls on the form, you ll find that the check box you selected is named DontShowContactList. When the code behind frmUsers detects a change to the options for the currently signed-on user, it makes sure the option variables in modGlobals get changed as well. Be sure to close the frmUsers form when you re finished looking at it. 772
Part 5: Automating an Access Application
Understanding Visual Basic Fundamentals
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Figure 22-10.
The gintDontShowContactList variable is set to the value of a form control.
Examining the Procedure Call Sequence (Call Stack)
After stopping code that you re trying to debug, it s useful sometimes to find out what started the current sequence of code execution and what procedures have been called by Visual Basic. For this example, you can continue with the watch on the variable gintDontShowContactList. You should now be at the main switchboard form (frmMain) in the application. Click the Exit button to close the application and return to the Database window. (You ll see a prompt asking you if you re sure you want to exit click Yes. You might also see a prompt offering to back up the data file click No.) The code should halt again in the Close event of the frmMain form. Click the Call Stack button on the Debug toolbar or choose Call Stack from the View menu to see the call sequence shown in Figure 22-11 on the next page. The Call Stack dialog box shows the procedures that have executed, with the most recent procedure at the top of the list, and the first procedure at the bottom. You can see that the code started executing in the cmdExit_Click procedure of the frmMain form. This happens to be the Visual Basic event procedure that runs when you click the Exit button. If you click that line and then click the Show button, you should see the cmdExit_Click procedure in the module for the frmMain form (the switchboard) with the cursor on the line that executes the DoCmd.Close command to close the form. This line calls the Access built-in Close command (the <Non-Basic Code> you see in the call stack list), which in turn triggered the Close event procedure for the form. It s the Close event procedure code that sets the gintDontShowContactList variable back to False (0). Be sure that the Call Stack window is closed and click Continue on the toolbar to let the code finish. 773
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