The Window API function name you would like to use.Ģ. The declaration statement will tell the VBA virtual machine 3 important pieces of information.ġ. How to declare a Windows API functionĪ Windows API function must be declared correctly at the top of a VBA code module. Windows API declarations are always placed at the top of a VBA code module. In such cases, a VBA program is able to invoke an Windows API by declaring the Windows API function at the top of a VBA code module. For example, VBA does not have a function to measure time in milliseconds but it is available in Windows API (I will write a tutorial on microsecond timer in VBA). Often times a VBA programmer may not be able to find a suitable Excel or a native VBA language function to perform a task but is available within the Windows APIs. Fortunately, the Windows API has always exposed a large part of the underlying structure of the Windows operating systems to VBA programmers too! Why VBA programmers need this? The Windows Application Programming Interface ( Windows API) is a set of functions within the Microsoft Windows operating system that are available to Windows programmers.
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