zxing barcode generator example c# Part 4: Advanced VBA in C#.NET

Generate QR in C#.NET Part 4: Advanced VBA

Part 4: Advanced VBA
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Microsoft Office Excel 2003 Programming Inside Out
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4 Step 3 of the wizard prompts you to enter the name of your add-in, along with the add-in s description. This information will be displayed to users when they select the add-in from the COM Add-Ins dialog box. 5 Step 4 prompts you to select whether or not you would like your add-in to load whenever the host application loads and whether or not the add-in should be made available to all users or just the user who installed it. If you re not sure what values to use, just select both boxes. 6 The last step allows you to review all of your selections. If you want to revise any of your choices, press the Back button until you reach the appropriate step. Otherwise, press the Finish button to create the new project.
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Part 4: Advanced VBA
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Creating Add-Ins and COM Add-Ins Tip
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Developing Add-Ins That Span Multiple Office Applications It s possible to develop an add-in that can be used with multiple Office applications. This can be very useful if you want to write a general-purpose add-in such as an image browser or a file locator. By using the application object passed to the add-in OnConnection method, you can determine which application called the add-in and make the appropriate modifica tions to the menus or information contained in the application.
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Even though you selected Excel when you ran the wizard, you still need to explicitly add a ref erence to the Excel TypeLib in your Visual Basic .NET program. You can do this by choosing Project, Add Reference from the main menu. In the Add Reference dialog box, choose the COM tab and then select Microsoft Excel 11.0 Object Library. Finally, press the Select button and then OK to add the reference to your project.
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Because the code skeleton created with the Shared Add-In Wizard merely constructs a mini mal IDTExtensibility2 interface, you ll need to add your own code to make the add-in do something useful. In this case, we need to declare a module-level variable that contains information about the button to be added on the toolbar. The following statement defines the MyButton object. Notice that the WithEvents keyword is included. When the button is pressed in Excel, the Click event associated with the MyButton object will be fired.
Dim WithEvents MyButton As CommandBarButton
Part 4: Advanced VBA
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Microsoft Office Excel 2003 Programming Inside Out The OnConnection routine is called by the host application to initialize the add-in. As you saw earlier in this chapter, the only real work required by this routine is to save an object ref erence to the application object. All the following code is automatically generated by the wiz ard. The applicationObject variable is also defined by the wizard as a module-level variable and is used to access the resources owned by the application hosting the add-in.
Public Sub OnConnection(ByVal application As Object, _ ByVal connectMode As Extensibility.ext_ConnectMode, _ ByVal addInInst As Object, ByRef custom As System.Array) _ Implements Extensibility.IDTExtensibility2.OnConnection applicationObject = application addInInstance = addInInst End Sub
Note The Implements keyword indicates that this routine implements a routine found in a particular interface. In this case, you can see that the IDTExtensibility2.OnConnection routine is being referenced. The OnStartupComplete routine is called after the add-in has been initialized, but before the user can start using the application. This is the best place to modify menus or make any other changes to Excel. You can add a button to a toolbar with this code. First you create a new instance of the MyButton object by using the Add method associated with the Controls collection on a par ticular toolbar. Next set the Caption property to hold the name to be displayed on the button and set the Style property so that the caption is displayed on the button rather than on an icon.
Public Sub OnStartupComplete(ByRef custom As System.Array) _ Implements Extensibility.IDTExtensibility2.OnStartupComplete MyButton = applicationObject.CommandBars("Standard").Controls.Add(1)
MyButton.Caption = "My Button"
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