What is the difference between Extension DLL and Regular
DLL?
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Answer Posted / debasis mahapatra
An extension DLL supports a C++ interface. In other words,
the DLL can export whole classes and the client can
construct objects of those classes or derive classes from
them. An extension DLL dynamically links to the code in the
DLL version of the MFC library. Therefore, an extension DLL
requires that your client program be dynamically linked to
the MFC library (the AppWizard default) and that both the
client program and the extension DLL be synchronized to the
same version of the MFC DLLs (mfc42.dll, mfc42d.dll, and so
on). Extension DLLs are quite small; you can build a simple
extension DLL with a size of 10 KB, which loads quickly.
If you are working on the Win32 environment then
MFC regular DLL.
The regular DLL is two types: Static DLL and dynamic DLL.
If you choose static linking, your DLL will include a copy
of all the MFC library code it needs and will thus be
self-contained. A typical Release-build statically linked
regular DLL is about 144 KB in size. If you choose dynamic
linking, the size drops to about 17 KB but you'll have to
ensure that the proper MFC DLLs are present on the target
machine.
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