what is message loop how mfc does it internally?
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Answer Posted / sonali dongare
In Window programming Message is the main communication.The
messaes are stored in message queue.
the way you retrieve messages from the Message Queue is by
creating a Message Loop. A Message Loop is a loop that
checks for messages in the Message Queue. once a message is
received, the Message Loop dispatches the message by
calling a Message Handler, a function designed to help the
Message Loop at processing the message.
Message loop ends when WM_QUIT messae is retrived.In Mfc
WinMain is the entry point.since mfc uses event driven
programming model The Incoming messages enter in the
message queue window procedure process that messages and
send to window ,winmain create that window and enter into
message loop ,retrive messages and dispatches them to
window procedure.Messages wait in message queue untill they
are retrived.In order to retrive and dispatch the message
winmain execute simple while loop that call
GetMessage,TranslateMessage and DispathMessage API
Functions .GetMessage retrive message from message
queue ,TranslateMessage convert keyboard message to WM_CHAR
message and DispatchMessage dispatch messages to Window
procedure. Message loop end when it retrived WM_QUIT
message.
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