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If you use the SaveCopyAs method to save a file using an existing file name, the macro will overwrite the existing file without asking permission.
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Activating Workbooks
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In the Save and SaveAs property discussions, you noticed that the code used the ThisWork book object, which refers to the workbook to which the VBA code is attached. The ActiveWorkbook object is related to the ThisWorkbook object in that it refers to a workbook (obviously), but it refers to the workbook you have chosen to act on, not the workbook to which the code is attached. You can change the active workbook by calling the Workbooks collection s Activate method, as in the following line of code:
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Workbooks("2004Q3sales.xls").Activate
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Part 3: The Excel Object Model
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Closing Workbooks
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When you re done changing a workbook, it s a good idea to close it, both to save system resources and to reduce the likelihood that something will happen to the file while it s open. After all, all it takes is a stray keystroke here or there and the best data can become a meaningless jumble. As with the Save and SaveAs techniques you saw earlier in this section, you can use the ThisWorkbook property of the Application object to invoke the Close method, as in the following statement:
ThisWorkbook.Close
If you want to close another workbook from within a procedure, you can use this type of statement:
Workbooks("name").Close
When you ve reached the end of a macro and want to clean up by saving and closing every open workbook, you can use the following procedure:
Sub CloseAll() Dim Wkbk as Workbook For Each Wkbk in Workbooks If Wkbk.Name <> ThisWorkbook.Name Then Wkbk.Close SaveChanges:=True End If Next Wkbk ThisWorkbook.Close SaveChanges:=True End Sub
This procedure checks each workbook to ensure it isn t the workbook containing the VBA code. If the code were to close its own workbook while any other workbooks were open, any remaining open workbooks wouldn t be affected because the code would stop running. Caution
are new. The procedure does display a Save As dialog box if any of the open workbooks
Workbook Properties
Even though workbooks are the focal point of Excel, you ll actually spend less time manipulating workbooks than working with worksheets and cell ranges. Even so, there are a number of workbook properties you can use to help you and your colleagues work with Excel effectively.
Part 3: The Excel Object Model
Workbooks and Worksheets
Using the ActiveChart Property
Charts are great for visually summarizing data, but if you re constrained to displaying a chart within a relatively small area and don t have the room to include a legend or other information, you can use message boxes to display information about the chart that s selected. The following macro might be attached to a command button on a worksheet offering help to the user on the information in the active chart.
Sub ChartHelp() ChartChosen = ActiveChart.Name Select Case ChartChosen Case "": Exit Sub Case "Sheet1 Chart 1": MsgBox "This chart shows the sales for 2000-2004." Case "Sheet1 Chart 2": MsgBox "This chart shows the profits for 2000-2004." End Select End Sub
For more information on creating and manipulating charts in VBA, see 15, Charts.
Displaying Drawing Objects
Workbooks are full of data and, regardless of how well you structure the data, it might not always be easy to follow what s going on. Adding drawing objects, such as text boxes and arrows, lets you call out special features of your worksheets and provide helpful information to your users. If you use drawing objects to provide that sort of information, you also have the option to hide or display the objects at will by using the DisplayDrawingObjects method. The following code assumes you have a series of drawing objects that might obscure your data if left on the worksheet, but would help explain what s going on if the user could turn them on and off as desired. Figure 7-3 shows the message box produced by the procedure: clicking OK hides the drawing objects, whereas clicking Cancel leaves the objects visible.
Public Sub ShowObjects() ThisWorkbook.DisplayDrawingObjects = xlDisplayShapes Answer = MsgBox(Prompt:="Click OK to hide the drawing _ objects.", Buttons:=vbOKCancel + vbQuestion) If Answer = vbCancel Then Exit Sub Else ThisWorkbook.DisplayDrawingObjects = xlHide End If End Sub
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