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where formname is the name of an open form and controlname is the name of a control on that form. In this case, the direct reference is [FORMS]![PrintOptions]![optPrint]. (optPrint is the name of the option group control. You can see this in the Name property on the Other tab of the property sheet for this control.) For more details about the rules for referencing objects in Access, see 22, Understanding Visual Basic Fundamentals. Tip If your object names do not contain any embedded blanks or other special characters, you don t need to surround formname or controlname with brackets when you use this syntax to reference a control on a form; Access inserts the brackets as needed.
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Part 5: Automating an Access Application
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Understanding Event Processing Once you understand how to refer to the value of a control on a form, you can see that the PrintIt macro tests for each of the possible values of the option group control. When it finds a match, PrintIt runs the appropriately named macro within the macro object to open the requested report and then stops. If you look at the individual report macros, you ll see that they each run a common macro, DoReport.Cancel, to close the PrintOptions form (which isn t needed after the user chooses a report), and then open the requested report in Print Preview and put the focus on the window that displays the report.
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As you ll learn in the rest of this book, Visual Basic, rather than macros, is what you should use to automate any serious applications. If you ve spent some time getting familiar with programming in Access using macros but would now like to move to Visual Basic, you re in luck! Access provides a handy tool to convert the actions in macros called from events on your forms and reports to the equivalent Visual Basic statements. To see how this works, open WeddingListForm in Design view. Choose Macro from the Tools menu, and then click Convert Form s Macros To Visual Basic on the submenu, as shown in Figure 21-15.
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Figure 21-15.
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Converting a form s macros to Visual Basic.
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In the next dialog box, the Convert Wizard offers you the option to insert error-handling code and to copy the comments from your macros into the new code. You should leave both options selected, and then click Convert to change your macros to Visual Basic. After the wizard is finished, you should see all macro references in event properties changed to [Event Procedure]. Click the On Current event property for WeddingListForm, and then click the 755
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Part 1: Part Title
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Converting Your Macros to Visual Basic
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Part 5: Automating an Access Application
Microsoft Office Access 2003 Inside Out Build button (...) to the right of the property. You ll see the converted code displayed as shown in Figure 21-16.
Part 1: Part Title
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Figure 21-16. Basic.
The macro from the Current event of WeddingListForm converted to Visual
Note Converting your macros to Visual Basic does not delete any of your original macros. Also, the wizard doesn t convert any macros referenced by a RunMacro command you ll have to do that yourself. Note In 23, Automating Your Application with Visual Basic, I ll introduce you to some enhancements I made to the Wedding List sample database after I converted all the macros to Visual Basic using this wizard. You can find this version of the database saved as WeddingList.mdb on the companion CD.
Part 5: Automating an Access Application
22
Understanding Visual Basic Fundamentals
The Visual Basic Development Environment . . . . . . . . . . . . . . . . . . . . . Variables and Constants . . . . . . . . . . . . Declaring Constants and Variables . . . . Collections, Objects, Properties, and Methods . . . . . . . . . . . . . . . . . . . . . Functions and Subroutines . . . . . . . . . . 758 774 778 791 812 Understanding Class Modules . . . . . . . . 815 Controlling the Flow of Statements . . . . 823 Running Macro Actions and Menu Commands . . . . . . . . . . . . . . . . . . . . . . . 832 Trapping Errors . . . . . . . . . . . . . . . . . . . . 834 Some Complex Visual Basic Examples . . . . . . . . . . . . . . . . . . . . . . . . 836
In this chapter, you ll learn how to create, edit, and test Visual Basic code in your Access applications. The chapter covers the following major topics:
The Microsoft Visual Basic Editor (VBE) and its debugging tools Variables and constants and how to declare them The primary object models defined in access the Access model, the Data Access
Objects (DAO) model, and the ActiveX Data Objects (ADO) model You ll need to understand these models to be able to manipulate objects such as forms, form controls, and recordsets in your code.
Visual Basic procedural statements Function and Sub statements Property Get, Property Let, and Property Set (for use in class modules) statements Flow-control statements, including Call, Do, For, If, and Select Case DoCmd and RunCommand statements On Error statement A walk-through of some example code you ll find in the sample databases
If you re new to Visual Basic, you might want to read through the chapter from beginning to end, but keep in mind that the large section in the middle of the chapter on procedural statements is designed to be used primarily as a reference. If you re already familiar with Visual Basic, you might want to review the sections on the Visual Basic Editor and the object models, and then use the rest of the chapter as reference material. Note You can find many of the code examples from this chapter in the modExamples module in the Contacts.mdb and Housing.mdb sample databases on the companion CD. 757
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