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Introduction This article explains how to use the IVsMonitorSelection interface from an add-in. More Information The IVsMonitorSelection interface of the Visual Studio 2005 SDK can be used to receive notifications of selection events and to retrieve information about UI context. In this example we will use it to retrieve conditions declared in the EnvDTE80.ContextGuids class, for example vsContextGuidDebugging, vsContextGuidDesignMode, vsContextGuidSolutionExists, vsContextGuidSolutionHasMultipleProjects, vsContextGuidSolutionHasSingleProject, vsContextGuidNoSolution, etc. To get a service from an add-in, see HOWTO: Get a Visual Studio service from an add-in. The IVsMonitorSelection service has an IsCmdUIContextActive method that returns if a context GUID is active. This method receives a dwCmdUICookie integer parameter, not a context GUID, but you can get the cookie of a context GUID using the GetCmdUIContextCookie method. The following sample creates an add-in, when loaded, reports if a solution is open in the IDE or not, using the vsContextGuidSolutionExists context Guid, rather than the automation model (DTE.Solution.IsOpen): Imports System Imports Microsoft.VisualStudio.CommandBars Imports Extensibility Imports EnvDTE Imports EnvDTE80 Imports Microsoft.VisualStudio.Shell.Interop Imports System.Windows.Forms Public Class Connect Implements Extensibility.IDTExtensibility2 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
Dim applicationObject As DTE
Dim monitorSelection As IVsMonitorSelection
Dim cookie As UInteger
Dim result As Boolean = False
Dim active As Integer
Try applicationObject = CType(application, DTE) Select Case connectMode Case ext_ConnectMode.ext_cm_AfterStartup, ext_ConnectMode.ext_cm_Startup monitorSelection = DirectCast(GetService(applicationObject, _
GetType(IVsMonitorSelection)), IVsMonitorSelection)
monitorSelection.GetCmdUIContextCookie(New Guid(ContextGuids.vsContextGuidSolutionExists), cookie) If monitorSelection.IsCmdUIContextActive(cookie, active) <> 0 Then
' Error. It should not happen
Else
If active = 1 Then
MessageBox.Show("There is a solution loaded")
Else
MessageBox.Show("There is no solution loaded")
End If
End If
End Select
Catch e As System.Exception
System.Windows.Forms.MessageBox.Show(e.ToString)
End Try
End Sub Public Sub OnDisconnection(ByVal RemoveMode As Extensibility.ext_DisconnectMode, _
ByRef custom As System.Array) _
Implements Extensibility.IDTExtensibility2.OnDisconnection
End Sub
Public Sub OnStartupComplete(ByRef custom As System.Array) _
Implements Extensibility.IDTExtensibility2.OnStartupComplete
End Sub
Public Sub OnBeginShutdown(ByRef custom As System.Array) _
Implements Extensibility.IDTExtensibility2.OnBeginShutdown
End Sub
Public Sub OnAddInsUpdate(ByRef custom As System.Array) _
Implements Extensibility.IDTExtensibility2.OnAddInsUpdate
End Sub
Private Function GetService(ByVal serviceProvider As Object, ByVal type As System.Type) As Object
Return GetService(serviceProvider, type.GUID)
End Function
Private Function GetService(ByVal serviceProvider As Object, ByVal guid As System.Guid) As Object Dim objService As Object = Nothing
Dim objIServiceProvider As Microsoft.VisualStudio.OLE.Interop.IServiceProvider
Dim objIntPtr As IntPtr
Dim hr As Integer
Dim objSIDGuid As Guid
Dim objIIDGuid As Guid
objSIDGuid = guid
objIIDGuid = objSIDGuid
objIServiceProvider = CType(serviceProvider, Microsoft.VisualStudio.OLE.Interop.IServiceProvider) hr = objIServiceProvider.QueryService(objSIDGuid, objIIDGuid, objIntPtr) If hr <> 0 Then
System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(hr)
ElseIf Not objIntPtr.Equals(IntPtr.Zero) Then
objService = System.Runtime.InteropServices.Marshal.GetObjectForIUnknown(objIntPtr)
System.Runtime.InteropServices.Marshal.Release(objIntPtr)
End If
Return objService End Function End Class Related Articles Go back to the 'Resources for Visual Studio .NET extensibility' section for more articles like this
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