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Part 6: Excel and the Outside World: Collaborating Made Easy
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Excel and Other Office Applications In the DisplayOutlookContactNamesEarlyBinding procedure, you declared olApp to be an Outlook.Application type. The other Dim statements also declare object variables of the type that you required to complete the objectives. If the same object name is used in more than one Object Library, you can precede the object name by the name of the application, rather than depend on the priority of the type library. You ll notice this technique was used with the Outlook NameSpace property. The New keyword is used when assigning a reference to Outlook.Application to olApp to create a new instance of Outlook. Because the variable types were declared, the VBA procedure is forced to use early binding. You could use the CreateObject function to create the olApp object variable, instead of the New keyword, without affecting the early binding. But it s more efficient to use the New keyword.
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Interacting with Other Office Applications
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Using VBA to access other Microsoft Office applications is similar to using code to work with objects within the code s host application. To begin, you create an object variable that points to the Application object representing the Office application that contains the objects you want to work with. It s preferable to use an early bound object variable by using the New keyword. Alternatively, you can choose to use the CreateObject function or the GetObject function to create an object variable. When VBA code manipulates objects within the same application, the reference to the Application object is implicit. However, when you are automating another application, the reference to the Application object must be explicit. Review the following examples to see the difference between how the Application object is referenced, implicitly and explicitly. The first procedure demonstrates how to create a new Excel workbook and how to reference the Application object implicitly. The second proce dure demonstrates how to refer to the Microsoft Word application explicitly and to create a new document. For the second procedure to be executed successfully, the reference to the Microsoft Word Object Library must first be added to the Excel application using the Tools, References command in the Visual Basic Editor.
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Sub CreateNewWorkbookFromExcel() Dim xlNew As Excel.Workbook Set xlNew = Workbooks.Add ActiveCell.Value = "Created " & Date End Sub Sub CreateWordDocumentFromExcel() Dim wdApp As Word.Application Dim docNew As Word.Document
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Part 6: Excel and the Outside World: Collaborating Made Easy
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Set wdApp = New Word.Application
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Set docNew = wdApp.Documents.Add
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wdApp.Selection.TypeText "This file was created " & Date
With docNew
MsgBox " " & .Name & " was created " & Date & "."
.Close wdDoNotSaveChanges
End With wdApp.Quit Set wdApp = Nothing End Sub
Typically, you ll create an object variable that refers to the Application object representing the application you want to access through automation. When the Application object has been referenced, you can include additional references to the object s child objects to navigate to the object or method you want to manipulate. Use the Set statement to assign object variables to child objects. Note The top-level object is the Application object. The Application object contains other objects that you can only access if the Application object exists. The objects dependent on the Application objects, are often referred to as the child objects. The child objects may also have children of their own. For example, the Excel Workbook object is the child object to the Excel Application object, and the Worksheets object is the child object of the Excel Workbook object. However, Microsoft Excel and Word make it possible to create a top-level reference to some child objects of the Application objects. Knowing this fact, you can rewrite the code for the CreateWordDocumentFromExcel procedure to start from a reference to a Word Document object.
Sub CreateWordDocumentFromExcel2() Dim docNew As Word.Document Set docNew = New Word.Document
Set docNew = Documents.Add
docNew.Application.Selection.TypeText "This file was created " & Date
With docNew
MsgBox " " & .Name & " was created " & Date & "." .Close wdDoNotSaveChanges End With Set docNew = Nothing End Sub
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