Application.ActiveDocument Property (Visio)
Returns the active Document object, which is the document shown in the active window. Read-only.
Version Added: Visio 2.0
expression A variable that represents an Application object.
When no documents are open, there is no active document and the ActiveDocument property returns the value Nothing and does not raise an exception.
If your code is in the Microsoft Visual Basic project of a Visio document, the ActiveDocument property often, but not necessarily, returns a reference to the ThisDocument object, a class module in the Visual Basic project of every Microsoft Visio document. If the ThisDocument object is shown in the active window, the ActiveDocument object and the ThisDocument object refer to the same document. When the ThisDocument object is referenced from code in a project, it returns a reference to the project's Document object.
Whether you use the ActiveDocument object or the ThisDocument object depends on the purpose of your code.
You can compare the result returned by the ActiveDocument property with the value Nothing to determine if a document is active. If the value of the Application.Documents.Count property is greater than zero, at least one document is open and active.
If your Visual Studio solution includes the Microsoft.Office.Interop.Visio reference, this property maps to the following types:
The following Microsoft Visual Basic for Applications (VBA) macro shows two safe ways to get an active document (if one exists). In each case, it prints the name of the active document in the Immediate window. The code gets the active document without qualification from the Visio global object, which is automatically available to VBA code that is part of the VBA project of a Visio document.
Public Sub ActiveDocument_Example() Dim vsoDocument As Document 'First method If Documents.Count > 0 Then Set vsoDocument = ActiveDocument Debug.Print vsoDocument.Name Else Debug.Print "No active document." End If 'Second method If Not(ActiveDocument Is Nothing) Then Set vsoDocument = ActiveDocument Debug.Print vsoDocument.Name Else Debug.Print "No active document." End If End Sub