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If you are going to use Windows API calls in your code it may be worth encapsulating them into a class.īefore you can use a Windows API function you must delcare the function at the top of a standard code module above the first procedure.ĭeclaring a Windows API can be a bit tricky for the following reasons:Ģ) Deciding in which library the function is locatedģ) Knowing the exact arguments Declare Function GetKeyState Lib "user32" ( ByVal nVirtKey As Long) As Integer Most of these functions are stored in the three link libraries (User32.dll, Kernel.dll & ?)Ī full list of all Windows API functions and subroutines, containing the syntax of their calls can be found in the help file "WIN32API.txt" which is available for download from the unit websites. These functions provide facilities to create a window, change its size, read and write Registry entries, manipulate a file and so on. The common routines reside in a Dynamic Link Library and are stored in the Windows / System directory if more than one program uses them. Libraries are usually 'dynamically linked' to the program. Whenever you use an API (Application Programming Interface) call function prefix the alias with "A" eg aFindWindow Public Declare PtrSafe Function GetTickCount Lib "kernel32" () As LongLong When declaring an API you must acknowledge this fact by adding the PtrSafe keyword to the API declaration. In 32 bit office a pointer must be a 32 bit variable In 64 bit office a pointer must be a 64 bit variable.
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The obvious problem is the same functions and procedures are reproduced lots of times. The program included all the functions it needed. In traditional applications the functions used / called where 'statically linked' to the program. These functions are a set of functions that Windows programs use to manipulate Windows. The reason for calling an API function is to perform something that would otherwise be impossible.
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Creates a reference to a procedure or function in an external DLL.
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