C++ COM Interface, ATL, Virtual
Function |
Objectives :
- myClassCOMVtable1.cpp
COM:
Component Object Model, created with an objective to deliver software in
non-windows platform, such as Solaris and Unix ( and it's
flavors).
ATL: Active Template Library
ATL is a C++ framework, and is used to develop COM components.
- COM interfaces are built using a VTable, which is a function
defined with a keyword "virtual".
class Base{
public:
virtual void print(){};
}
- A class containing a virtual function
is known as Abstract Class.
- As you noted that it just carries a signature of a function.
- The class that will inherit a virtual class, must define the
same function.
- Binding Type
- Late Binding : The virtual functions are resolved at the run-time, like a
late binding function.
- Early Binding: object->function(); // with arrow
operator/pointer
- Code:
myClassCOMVtable1.txt ,
myClassCOM_Non_Vtable1.txt
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Step: 1 Create a source file.
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Step: 2 Edit and save Source file
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Step: 3 Runtime Views:
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Step: Brief Discussion: if you don't use virtual, the print
function will not be called.
Note console is blank.
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