At its simplest,
CreateObject creates an instance of an object whereas
GetObject gets an existing instance of an object. Determining whether an object can be created or gotten will depend on it's Instancing property. Some objects are SingleUse (eg, WMI) and cannot be created if they already exist. Other objects (eg, Excel) are MultiUse and allow multiple instances to run at once. If an instance of an object does not already exist and you attempt
GetObject, you will receive the following trappable message:
Run-time error '429': ActiveX component can't create object.
GetObject requires at least one of these two optional parameters to be present:
CreateObject has one required parameter and one optional parameter:
Class is always comprised of two parts in the form of
Some example classes are:
Returns a reference to an object provided by an ActiveX component.
Use the GetObject function when there is a current instance of the object or if you want to create the object with a file already loaded. If there is no current instance, and you don't want the object started with a file loaded, use the CreateObject function.
Sub CreateVSGet() Dim ThisXLApp As Excel.Application 'An example of early binding Dim AnotherXLApp As Object 'An example of late binding Dim ThisNewWB As Workbook Dim AnotherNewWB As Workbook Dim wb As Workbook 'Get this instance of Excel Set ThisXLApp = GetObject(ThisWorkbook.Name).Application 'Create another instance of Excel Set AnotherXLApp = CreateObject("Excel.Application") 'Make the 2nd instance visible AnotherXLApp.Visible = True 'Add a workbook to the 2nd instance Set AnotherNewWB = AnotherXLApp.Workbooks.Add 'Add a sheet to the 2nd instance AnotherNewWB.Sheets.Add 'You should now have 2 instances of Excel open 'The 1st instance has 1 workbook: Book1 'The 2nd instance has 1 workbook: Book2 'Lets add another workbook to our 1st instance Set ThisNewWB = ThisXLApp.Workbooks.Add 'Now loop through the workbooks and show their names For Each wb In ThisXLApp.Workbooks Debug.Print wb.Name Next 'Now the 1st instance has 2 workbooks: Book1 and Book3 'If you close the first instance of Excel, 'Book1 and Book3 will close, but book2 will still be open End Sub