qr code library c# download Part 4: Advanced VBA in Visual C#

Encode QR Code ISO/IEC18004 in Visual C# Part 4: Advanced VBA

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Part 4: Advanced VBA
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Microsoft Office Excel 2003 Programming Inside Out
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COM add-ins are required to provide certain entries in the Windows registry. All registry entries are stored using the following key, where App is the name of the Office application (such as Excel) and ProgID is the ProgID value associated with the add-in. Typically, these entries are made by the add-in s installation program.
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HKEY_CURRENT_USER\Software\Microsoft\Office\App\Addins\ProgID
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Warning Manually changing the Windows registry can be dangerous. If you don t have a lot of experience editing the Windows registry, you should look but don t touch, and rely on the setup program for the add-in to make the proper changes. Should you wish to view and/or change registry entries, you can use the RegEdit program. (Click the Start button, click Run, type RegEdit, and click OK.) Underneath the key specified above are a series of subkeys that contain specific information about the add-in. The LoadBehavior subkey is a DWORD value that determines when an addin is loaded by the Office application. A value of 0 means that the add-in is not loaded. A value of 3 means that the add-in should be loaded when the application starts. A value of 9 means that the add-in is loaded when requested by the user. A value of 16 means that the add-in is loaded once, the next time the application starts. The Description subkey is a String value that s displayed in the COM Add-Ins dialog box, whereas the FriendlyName subkey is a String value that s returned by the add-in s Description property. Add-ins that use the IDTExtensibility2 interface also should have a registry entry named CommandLineSafe. This is a DWORD value that marks an add-in as safe to use in applica tions that don t support a user interface. A value of 0x00 means that the add-in needs a user interface, whereas a value of 0x01 means that the add-in doesn t rely on a user interface.
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Building an Automation Add-In with Visual Basic 6
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Visual Basic 6 includes a template that simplifies creating add-ins that use the IDTExtensibility2 interface, which you can use to create an automation add-in that implements the same DiscountPrice function that was built for the Excel add-in.
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Designing the Add-In
The code for the automation add-in is shown on the next page. The module begins by defin ing a public variable that will hold the reference to the Excel.Application object. The rest of the code implements the five methods required to handle the IDTExtensibility2 interface, along with one additional function that implements the same DiscountPrice function that was used in the Excel add-in earlier in this chapter.
Part 4: Advanced VBA
Creating Add-Ins and COM Add-Ins
Option Explicit Public ExcelApp As Excel.Application Private Sub AddinInstance_OnAddInsUpdate(custom() As Variant) Called when an add-in is changed End Sub Private Sub AddinInstance_OnBeginShutdown(custom() As Variant) Called when Excel is in the process of shutting down End Sub Private Sub AddinInstance_OnConnection(ByVal Application As Object, _ ByVal ConnectMode As AddInDesignerObjects.ext_ConnectMode, _ ByVal AddInInst As Object, custom() As Variant) Set ExcelApp = Application End Sub Private Sub AddinInstance_OnDisconnection( _ ByVal RemoveMode As AddInDesignerObjects.ext_DisconnectMode, _ custom() As Variant) Set ExcelApp = Nothing End Sub Private Sub AddinInstance_OnStartupComplete(custom() As Variant) Called when Excel is ready to use End Sub Public Function DiscountedPrice(ListPrice, Discount) As Currency If Discount <= 1 And Discount >= 0 Then DiscountedPrice = ListPrice * (1 - Discount) Else DiscountedPrice = 0 End If End Function
Part 4: Advanced VBA
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Microsoft Office Excel 2003 Programming Inside Out Of the five methods associated with the IDTExtensibility2 interface, only two do any work in this example. The AddinInstance_OnConnection method saves an object reference to the Excel application that was passed using the Application parameter. This object is necessary for the add-in to access the information stored in the Excel application. The AddinInstance_OnDisconnection method releases the object reference to the Excel object. Besides being a good programming practice, releasing the object helps to ensure the stability of the add-in. To create a new add-in in Visual Basic 6, follow these steps:
1@ Start Visual Basic 6. Then choose the AddIn project template in the New Project dialog box by selecting AddIn and pressing the Open button.
2@ When Visual Basic 6 starts, go to the Project Explorer window. Right-click frmAddIn, and choose Remove frmAddIn from the popup menu because this form won t be needed in this project. 3@ Choose Project, MyAddIn Properties from the main menu to display the Properties dialog box. Change MyAddIn in the Project Name field to something more meaningful. (See Figure 11-6.) 4@ Next double-click the Connect item under the Designers icon in the Project Explorer. This will open the AddInDesigner. Go to the Properties window, and change the Name property from Connect to a more appropriate description.
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