C++ Archives

C++ – How to define virtual functions?

By venkatPosted on March 13, 2014Posted in C++

C++ is a Object Oriented language. C++ uses virtual keyword in different places. One of the use of virtual keyword is to create virtual functions. An important feature in Object Oriented programming is Polymorphism; which means multiple-behaviors. An object has multiple behaviors and it shows particular behavior depending on its context. C++ achieves this with […]

COM – Creating a COM Component using C++ – DLL component

By venkatPosted on March 11, 2014Posted in C++, COM

In this series of articles on creating a COM Component using C++, in the previous article, we implemented a component using C++. The component implemented the IUnknown standard interface and IHello custom interface. Custom interfaces are the interfaces defined by us. Standard interfaces are the interfaces that are defined by the COM component library. We need to […]

COM – Creating a COM Component using C++ – IUnknown interface definition

By venkatPosted on March 7, 2014Posted in C++, COM

This is a series of articles explaining creating a COM component using C++. In our previous article, we defined an interface IHello and compiled the IDL file using Microsoft’s MIDL compiler. Now we are going to define a COM Component using C++. Remember that all the interfaces defined in an IDL file must be implemented. […]

COM – Creating a COM Component using C++ – IUnknown interface

By venkatPosted on February 28, 2014Posted in C++, COM

COM – An introduction COM (Component Object Model) is a platform-independent, distributed, and object-oriented technology developed by Microsoft to create re-usable software components and enables software components to communicate. COM enables interaction between objects through interfaces. Interfaces are core concepts to build COM components. An interface contains function prototypes only not the function implementations. COM […]

C++ – Pure Virtual functions

By venkatPosted on February 24, 2014Posted in C++

C++ Pure Virtual functions are used to create an abstract classes or interfaces. Pure Virtual functions have no function definition; just the function will be declared and the definition left to the derived classes. In C++, like Java, there is no interface keyword to create an interface. To create an interface in C++, the option […]