Understanding automation

Automation (formerly OLE Automation) is a feature of the Component Object Model (COM), an industry-standard technology that applications use to expose their objects to development tools, macro languages, and other applications that support Automation. For example, a spreadsheet application may expose a worksheet, chart, cell, or range of cells—each as a different type of object. A word processor might expose objects such as an application, a document, a paragraph, a sentence, a bookmark, or a selection.

When an application supports Automation, the objects the application exposes can be accessed by Visual Basic. Use Visual Basic to manipulate these objects by invoking methods on the object or by getting and setting the object's properties. For example, you can create an Automation object and write the following code to access the object.

MyObj.Insert "Hello, world." ' Place text. 
MyObj.Bold = True ' Format text. 
If Mac = True ' Check your platform constant 
 MyObj.SaveAs "HD:\WORDPROC\DOCS\TESTOBJ.DOC" ' Save the object (Macintosh). 
 MyObj.SaveAs "C:\WORDPROC\DOCS\TESTOBJ.DOC" ' Save the object (Windows). 

Use the following functions to access an Automation object.

Function Description
CreateObject Creates a new object of a specified type.
GetObject Retrieves an object from a file.

For information about the properties and methods supported by an application, see the application documentation. The objects, functions, properties, and methods supported by an application are usually defined in the application's object library.

See also

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