Inside Out in Visual C#

Make QR Code ISO/IEC18004 in Visual C# Inside Out

Inside Out
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Pausing a Macro One of the features of Excel is the ability to pull in data from outside sources. Suppose the flower shop has decided to expand and now has multiple stores. As the owner, you want to build a report that examines the sales data from each of the different stores every day. However, the macro to build the report takes some time to compile all the information and present in the manner you desire, so you d like it to run overnight so that the report is wait ing for you in the morning. Rather than having to wait until all stores have submitted their data to the main server and then running your macro, you can use the Wait method to pause the macro until a specific time. Using the code Application.Wait "20:00:00" instructs the macro to wait until 8:00 P before continuing to execute. To pause for a specific time interval and not a spe .M. cific time, you can add the time interval to the current time. Careful testing should be done before setting too great of an interval for pausing. The Wait method will halt all activity within Microsoft Excel and also has the potential to prevent you from using any other application on your computer.
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Part 3: The Excel Object Mode
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Microsoft Office Excel 2003 Programming Inside Out
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ScreenUpdating Property
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VBA macros execute very quickly, especially when compared with the speed at which a human could perform the same steps. As Excel performs the different actions programmed in the macro, the screen changes to reflect those actions. Enough actions could happen fast enough that the screen updates aren t processed as quickly as the actions in the macro and it appears as if the screen is flashing as it attempts to reflect the different steps performed. These screen updates also require some processing time, which will slow down the execution of the macro. To minimize the screen flashing and also maybe to gain a few seconds in processing time, especially on macros that require a lot of processing time, you can disable screen updates using the ScreenUpdating property. Setting the ScreenUpdating property to False at the start of a macro instructs Excel not to update the screen during execution until the property has been reset to True. It is very impor tant to fully test a macro for errors and add some type of error trapping when turning off screen updates so that the user does not think the macro or Excel has crashed when there is actually an error condition that s not being displayed to the user. It s also important to set ScreenUpdating to True, the default value, when the procedure has executed so that any other procedure that might have called the one that turns the screen updating off doesn t have to be concerned with whether or not the screen updates were turned on or off outside its own scope. The following procedure creates a new chart based on the data in the SalesByCategory.xls workbook and then waits three seconds before terminating the procedure.
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Sub BuildChart() Application.StatusBar = "Adding new chart..." Application.Wait (Now + TimeValue("0:00:03")) Application.ScreenUpdating = False Charts.Add 'Add a new chart object
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ActiveChart.ChartType = xl3DColumn 'Set the Chart type to #D Column
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ActiveChart.SetSourceData Source:=Sheets("ByCategory").Range("C1:G13"), _
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PlotBy:=xlColumns 'Set the data source ActiveChart.Location Where:=xlLocationAsObject, Name:="ByCategory" Application.StatusBar = "Configuring new chart..." With ActiveChart 'Format the chart .HasTitle = True .ChartTitle.Characters.Text = "Monthly Sales by Category" .Axes(xlCategory).HasTitle = True .Axes(xlCategory).AxisTitle.Characters.Text = "Month" .Axes(xlSeries).HasTitle = True .Axes(xlSeries).AxisTitle.Characters.Text = "Category" .Axes(xlValue).HasTitle = True .Axes(xlValue).AxisTitle.Characters.Text = "Sales" End With
ActiveSheet.Shapes(1).IncrementLeft -133.5 'Position the chart
ActiveSheet.Shapes(1).IncrementTop 214.5
ActiveSheet.Shapes(1).ScaleWidth 1.77, msoFalse, msoScaleFromTopLeft
ActiveSheet.Shapes(1).ScaleHeight 1.35, msoFalse, msoScaleFromTopLeft
Application.Wait (Now + TimeValue("0:00:03")) Application.StatusBar = False Application.ScreenUpdating = True End Sub
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Part 3: The Excel Object Mode
The Application Object
ThisWorkbook Property
ThisWorkbook returns a Workbook object that refers to the workbook that contains the macro that s currently running. This property lets Add-Ins refer to the workbook that contains the code. ActiveWorkbook will not work because it refers to the currently active workbook and not the workbook that actually contains the code being executed. The following example demonstrates the ThisWorkbook property by displaying a message box with the name of the active workbook and the name of the workbook the macro is being executed from:
Sub TestThisWorkbook() Dim strMessage As String strMessage = "Active Workbook = " & ActiveWorkbook.Name & vbCrLf strMessage = strMessage & "This Workbook = " & ThisWorkbook.Name MsgBox strMessage, vbOKOnly + vbInformation, _ "Microsoft Office Excel 2003 Programming Inside Out" End Sub
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