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In COM add-ins, when OnConnection is called, the add-in receives a reference to the application object that has loaded the add-in In the case of InfoPath, this is the InfoPath Application object in the InfoPath OM However, in the case of a managed add-in, when ThisAddIn_Startup is called, the object passed in is not the application object, it s the add-in itself You can still access the InfoPath object model, though, and do everything that we discussed earlier for COM add-ins create toolbar buttons and other UI, access the data in the form, sink application and form events, and so on The add-in you create includes a partial class that is called ThisAddIn by default When you created the project, in addition to ThisAddIncs (or ThisAddInvb), VSTO creates a le called ThisAddInDesignercs/vb that contains the rest of the class de nition (Note that you will not see this le in the Solution Explorer in Visual Studio by default However, it does exist in the project folder) This class contains two data members (among other methods and properties) Application and CustomTaskPanes (We ll talk about the latter shortly) The Application data member is a reference to the Application object of the application that is hosting the add-in in this case, InfoPath You can cast this property to InfoPathApplicationClass in order to have access to the full Application object in the InfoPath OM Take a look at Listing 2017, which shows the implementation of the ThisAddIn_ Startup method in our sample add-in In the implementation of ThisAddIn_Startup, we rst cast the Application data member to InfoPathApplicationClass Then, just as we did with the COM add-in we built earlier, we obtain a reference to the pplicationEvents object so that we can sink the XDocumentOpen, NewXDocument, and XDocumentBeforeClose events So, as you can see, just as with COM add-ins, you can access the InfoPath object model in a managed add-in We ll leave it up to you to implement the toolbar buttons and additional functionality that we discussed earlier for COM add-ins.

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Since Custom Task Panes are built with a combination of a COM add-in and an ActiveX control, it s inevitable that you will want to have the COM add-in communicate with the ActiveX control and vice versa For example, when you click the show/hide button in the toolbar, you want it to not only show the task pane but also actually do something show the XML structure and data of the form Likewise, when you press the refresh button, you ll want to update the task pane with any changes from the document The obvious way to do this is to obtain a reference (or pointer in unmanaged code) to an interface implemented by the ActiveX control and then call a method or set a property on the control But how do you get to the ActiveX control from within the code for the COM add-in That s where the ContentControl property of the CustomTaskPane object comes in handy The ContentControl property is set to the instance of the ActiveX control created when the CreateCTP method is called This property gives your COM add-in access to the ActiveX control instance loaded in the task pane You can cast this property (in managed code) or call QueryInterface for it (in unmanaged code) to obtain any interface supported by the control Then, just call methods or access properties on the interface as usual Let s see how to do this in our COM add-in that we ve implemented in C# First, we must build the ActiveX control and then set a reference to its DLL in our COM add-in project In the ase of our FormDataTaskPane solution, the ActiveX control DLL is named FormDataTaskPaneActiveXdll Setting a reference to this DLL in our C# project will automatically generate an interop assembly that we can use in C# Next, we add a using statement to the top of the FormDataTaskPane namespace (for the COM add-in) so.

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CreateTypeLib2 API in OleAut32DII or simply by calling QueryInterface on any ITypeLib reference Similarly, you can get an ICreateTypeInfo2 interface from an ITypeInfo reference All the type library interfaces and functions are defined in TLBTypesolb (VBoost: Type Library Types and Interfaces) included with this book In addition, there is a type library editor add-in, called PowerVB Type ibrary Editor, that allows you to define and modify referenced typelibs from within VB's IDE (Source code for this and all other tools is included) There are several reasons to use the typelib API directly First, the API enables a friendly graphical interface that isn't available with ODL Second, it enables you to duplicate or edit existing typelibs Third, there are several things you can do with the API that aren't possible with the compilers For example, you can specify multiple help files for a single typelib, use a nonzero base for a fixed-size array, and explicitly lay out the vtable order (complete with holes in the vtable if you like) The API also supports the use of types before they have been defined in the typelib (forward referencing) VB generates typelibs with strange ordering For example, enums and records are defined after the functions that use them If you dump the ODL for a VB-generated typelib and try to compile, compilation often fails The only way to reliably edit the compatibility file or other VB-generated typelibs is with the direct ICreateType* interfaces You may not think that the type ordering is important But if you use your libraries from VBA and change the type ordering, you must also increase at least the minor version number of the library If you don't, your VBA project crashes when it attempts to recompile against the new library I don't know of any other tools that care about the type ordering in a library, but there may be others as well.

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The data member _userControl is an instance of the TrackBarUserControl class After creating this object, we add it to the collection of Custom Task Panes by calling the Add method on the CustomTaskPanes collection The rst parameter passed in is the User Control we want to host in the task pane The second parameter is the title that will show at the top of the task pane Now we ve created the task pane and hosted the User Control inside it However, even though the add-in will be created when the application starts, the task pane will be hidden until we make it visible As we mentioned earlier, we want to show the task pane when a form is opened and hide it when that form is closed Therefore, we want to show the task pane when either the XDocumentOpen or NewXDocument events are red and hide it when XDocumentBeforeClose occurs When the form is opened (and the two former events are handled by the add-in), we call common helper method called OnFormOpened, which is shown in Listing 2018.

In the OnFormOpened method, we re going to obtain a reference to the rst eld in the form so that we can update its value when the track bar s value changes in the task pane To do that, after ensuring that the DOM is not null, we obtain a reference to the root node of the form If you ve created a blank form in InfoPath, the root node will be my:myFields Next, we select the rst node that is a child of the root node (This sample includes a sample form template TrackBarSample that has a single eld The rst child node of the root node in this case is my: eld1) Once we have a reference to the ode that we re going to update, we create a new event handler for the ValueChanged event for the TrackBar control in the User Control (The TrackBar property is a simple property we created that exposes the TrackBar control hosted in the User Control) This event handler simply sets the value of the node to the current value of the TrackBar control:.

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In this chapter, we ll rst tell you a little about COM add-ins Then, we ll show you how to create your own add-in that will enable you to copy XML data from one form and paste it into another Once you have a good understanding of the basics, we ll show you how to combine a COM addin with an ctiveX control to create your own Custom Task Pane that will show you the XML structure and data in the currently opened InfoPath form Finally, we ll show you how to create managed add-ins with Visual Studio 2005 Tools for the 2007 Microsoft Of ce System (VSTO 2005 SE).Is called when a change occurs to the add-in Is called when the application is being shut down Occurs when the add-in is loaded by the host application Occurs when the add-in is unloaded by the host application Is called when the application has completed its startup procedure as long as the add-in is set o load at application startup. Generating UPC - 8 In VS .NET Using Barcode generation for ASP .Related: 

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