-define class with necessary data member & member function.
-create object of that class.
-communication.
Class Object Message
The default is to pass by value.
because c++ supports all the basic concepts of oop :1.objects,2.classes,3.data abstraction and encapsulation,4.inheritance,5.polymorphism,6.dynamic binding,5.message passing.
#include<windows.h> int main() { MessageBox(0,"Hello","Welcome Message",1); return 0; }
#include<iostream> int main() { std::cout << "Hello world!\n"; }
message passing is the way of exchanging information between systems or individuals,at d same time.advantage is that we can interact by getting all the necessary details
WM_* identifiers are Windows Message Codes defined in windows.h. They really have nothing special to do with C++ projects, as they are a function of an implementation library. There are more than several hundred different message codes.
parameter passing in c, what does it do?
Pass by value, constant value, reference and constant reference. Pass by value is the default in C++ (pass by reference is the default in Java).
In Windows, whenever you rotate the mouse wheel, the WM_MOUSEWHEEL macro (value 0x020A) is sent to the form or window that currently has focus. Simply map this message to an appropriate handler in your form. The direction and amount of rotation can be determined by invoking the GET_WHEEL_DELTA_WPARAM macro, passing the message's wParam as the argument. The lParam contains the mouse coordinates. If there is no handler in your form, the message propagates up through the parent forms until a handler is found.
The C grade is a passing grade.
There is no "C" in message.