195: Definition of the IObjectSafety Interface in .NET framework

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Listing 195: Definition of the IObjectSafety Interface
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[ComImport] [Guid("CB5BDC81-93C1-11CF-8F20-00805F2CD064")] [InterfaceType(ComInterfaceTypeInterfaceIsIUnknown)] interface IObjectSafety { [PreserveSig] int GetInterfaceSafetyOptions( ref Guid riid, out int pdwSupportedOptions, out int pdwEnabledOptions); [PreserveSig] int SetInterfaceSafetyOptions( ref Guid riid, int dwOptionSetMask, int dwEnabledOptions); }
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After declaring the IObjectSafety interface, the obvious next step is to implement it First, we must add it to the inheritance list for the InfoPathMaskedTextBox class and then implement both its methods, as
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shown in Listing 196 As you can tell from the code, the more important method is GetInterfaceSafetyOptions This method is called by InfoPath to determine whether the control is safe for scripting and initialization When this method is called, we must return both the supported and the enabled safety options Typically, these are the same In order for our control to work in InfoPath, it must be safe for scripting and initialization Therefore, we set both the supported and the enabled options to INTERFACESAFE_FOR_UNTRUSTED_CALLER, which indicates that the control is safe for scripting, and INTERFACESAFE_FOR_UNTRUSTED_DATA, which indicates that it is safe for initialization (Note that the values for both of these constants come directly from the objsafeidl le)
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Listing 196: Implementation of the IObjectSafety Interface Methods and Constants
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private const int INTERFACESAFE_FOR_UNTRUSTED_CALLER = 1; private const int INTERFACESAFE_FOR_UNTRUSTED_DATA = 2; private const int S_OK = 0; int IObjectSafetyGetInterfaceSafetyOptions( ref Guid riid, out int pdwSupportedOptions, out int pdwEnabledOptions) { pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA; pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA; return S_OK; } int IObjectSafetySetInterfaceSafetyOptions( ref Guid riid, int dwOptionSetMask, int dwEnabledOptions) { return S_OK; }
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Now that we ve completed all the prerequisites to use a control in InfoPath, after building it, we re ready to put it to use in our form templates First, however, as you learned earlier, we have to register the control with InfoPath Normally, we do that by using the Add or Remove Custom Controls dialog
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from the Controls task pane But wait! If you look at the controls included in the list of ActiveX controls in the Add or Remove Custom Controls dialog, the InfoPathMaskedTextBox control isn t there But why The reason is that this list includes only controls that are listed in the Controls category in the registry Controls created by using NET, whether or not they use COM interop, are not registered as ActiveX controls Therefore, they won t be included in the list of ActiveX controls in the Add or Remove Custom Controls dialog in InfoPath All is not lost, however We can still make this work, and doing so is surprisingly easy All you have to do is register the control in the same way as an ActiveX control The easiest way to do this is by using a setup program Since the InfoPathControlLibrary project includes a setup project, we ll just use that one In the setup project, go to the registry view of the project and add a key named CLSID under HKEY_CLASSES_ROOT Next, create a new key under the CLSID key that corresponds to the GUID for your control This is the same GUID we speci ed earlier for the InfoPathMaskedTextBox class "F24E3AC4-3987-4a62-9DDC-AB56CE896301" Finally, create a new key as a child of this key and name it Control The value of the key is the name of the class "InfoPathMaskedTextBox" The setup program will take care of adding any additional keys needed to register the InfoPathMaskedTextBox control as an ActiveX control Once you build the setup program and install it, your control will look like a standard ActiveX control and will appear in the list of controls in the Add or Remove Custom Controls dialog Once the InfoPathMaskedTextBox control is installed, you can insert it into your form templates as usual And it will work like a normal InfoPath control in that it can be bound to elds in the data source and can be enabled and disabled However, once you ll out a form that uses your managed control, you will immediately discover a problem When you change data in the control, the data source is not updated with your changes That is because the control doesn t alert InfoPath of data changes through the IPropertyNotifySink interface
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