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Chapter 31. Advanced VBA Programming > Extending VBA with the Windows API

Extending VBA with the Windows API

Windows 95 and Windows NT contain an extensive set of code libraries that can be used directly in your VBA macros. These libraries, and the methods for using them in your macros, are know as the Windows Application Programming Interface, or the Windows API.

Windows is constructed of a special kind of code library, known as a Dynamic Link Library, or DLL. Each DLL file may contain many functions, usually written using the C++ programming language, that perform a variety of purposes in the operation of Windows and the applications that work in Windows. Many of these functions are low-level functions that would be of little use to your VBA programs. Others provide functions that are already present in VBA, such as Input boxes and message boxes. Some, however, provide functionality that is missing or incomplete in VBA.


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