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What is the difference between regular dlls and extended
dlls?
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Answer Posted / n.venkateshwara rao.
DLL is acronym of Dynamic Link Libraries.
The libraries (In simple functions) can be linked to the
main program in two different ways as given below,
a) Statically linked (Static linking/Early Binding)
Link between main module and sub module is happened at
compilation stage itself.
b) Dynamically linked (Dynamic linking/Late Binding).
Link between main module and sub module is happened at Run
time.DLLs adhere dynamic binding.
Advantage of DLLs is that they are separate Object Binary
(.obj) and kept aside/away of the main Executable (.exe)
program.
They are loaded at Run-time on demand basis and can be un-
loaded if their purpose is solved. Since they are not the
part of main exe the memory required to load main exe would
be comparitively less. But the functions that were
statically bound tooks more memory and their object (.obj)
binary would be the part of main exe (.exe)
Take a long breath ...
Now coming to the main part of the query ...
Regular DLLs can be exported to any where irrespective of
the technology/language in which they are used/called. For
eg - Regular DLLs can be called from C,C++ and Visual Basic
too. In simple they can be used any where even though the
client program which is called don't have MFC libraries.
Extend DLLs -
In extended DLLs we can export total class itself. i.e we
can export the member function of the classes. They
requires MFC libraries in the client program from where
they are called/used.
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