how to create qr code using vb.net Figure 21-7. The Save As dialog box for saving a macro. in Visual Studio .NET

Drawer Code-128 in Visual Studio .NET Figure 21-7. The Save As dialog box for saving a macro.

Figure 21-7. The Save As dialog box for saving a macro.
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Testing Your Macro
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You can run some macros (such as the simple one you just created) directly from the Database window or from the Macro window because they don t depend on controls on an open form or report. If your macro does depend on a form or a report, you must link the macro to the appropriate event and run it that way. (You ll learn how to do this later in this chapter.) 747
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Part 5: Automating an Access Application
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Microsoft Office Access 2003 Inside Out However you run your macro, Access provides a way to test it by allowing you to single step through the macro actions. To activate single stepping, switch to the Database window, click the Macros tab, select the macro you want to test, and click the Design button. This opens the macro in the Macro window. Either click the Single Step button on the Macro toolbar or choose the Single Step command from the Run menu. Now when you run your macro, Access opens the Macro Single Step dialog box before executing each action in your macro. In this dialog box, you ll see the macro name, the action, and the action arguments. Try this procedure with the TestGreeting macro you just created. Open the Macro window, click the Single Step button, and then click the Run button. The Macro Single Step dialog box opens, as shown in Figure 21-8. (Later in this section, you ll learn how to code a condition in a macro. The Macro Single Step dialog box also shows you the result of testing your condition.)
Part 1: Part Title
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Figure 21-8. The Macro Single Step dialog box.
If you click the Step button in the dialog box, the action you see in the dialog box will run and you ll see the dialog box opened by your MsgBox action with the message you created, as shown in Figure 21-9. Click the OK button in the message box to dismiss it. If your macro had more than one action defined, you would have returned to the Macro Single Step dialog box, which would have shown you the next action. In this case, your macro has only one action, so Access returns you to the Macro window.
Figure 21-9. The dialog box created by the MsgBox action in the TestGreeting macro.
If Access encounters an error in any macro during normal execution of your application, Access first displays a dialog box explaining the error it found. You then see an Action Failed dialog box, which is similar to the Macro Single Step dialog box, containing information
Part 5: Automating an Access Application
Understanding Event Processing about the action that caused the problem. At this point, you can click only the Halt button. You can then edit your macro to fix the problem. Before you read on in this chapter, you might want to return to the Macro window and click the Single Step button again so that it s no longer selected. Otherwise you ll continue to single step through every macro you run until you exit and restart Access or click Continue in one of the Single Step dialog boxes.
Defining Multiple Actions
In Microsoft Access, you can define more than one action within a macro, and you can specify the sequence in which you want the actions performed. The Wedding List Macro database contains several examples of macros that have more than one action. Open the database if it is not open already. Click the Macros button, and select the macro named AutoexecXmpl. Click the Design button to open the Macro window. The macro is shown in Figure 21-10.
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Tip If you create a macro and name it Autoexec, Access runs the macro each time you open the database in which it is stored. The preferred method to run startup code is to define a startup form by choosing Startup from the Tools menu. For details, see 24, The Finishing Touches. If this macro were named AutoExec, Access would execute each action automatically whenever you open the database. This sample macro is an example of a macro you might design to start the application when the user opens your database. Nine actions are defined in this macro. First, the Hourglass action displays an hourglass mouse pointer to give the user a visual clue that the next several steps might take a second 749
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