Search results
Results from the WOW.Com Content Network
The message loop is an obligatory section of code in every program that uses a graphical user interface under Microsoft Windows. [1] Windows programs that have a GUI are event-driven. Windows maintains an individual message queue for each thread that has created a window. Usually only the first thread creates windows.
The event-loop may be used in conjunction with a reactor, ... The "heart" of most Win32 applications is the WinMain() function, which calls GetMessage() in a loop.
Events trigger responses or actions and are fundamental to event-driven systems. These events can be handled synchronously, where the execution thread is blocked until the event handler completes its processing, or asynchronously, where the event is processed independently, often through an event loop.
This operating-system -related article is a stub. You can help Wikipedia by expanding it.
The caller may optionally specify a Win32 event handle to be signalled when the operation completes. Alternatively, a program may receive notification of an event via an I/O completion port, which is the preferred method of receiving notification when used in symmetric multiprocessing environments or when handling I/O on numerous files or sockets.
Event-driven programming is the dominant paradigm used in graphical user interfaces applications and network servers. In an event-driven application, there is generally an event loop that listens for events and then triggers a callback function when one of those events is detected.
The basic model of any API on top of Microwindows is to initialize the screen, keyboard and mouse drivers, then hang in a select() loop waiting for an event. When an event occurs, if it is a system event like keyboard or mouse activity, then this information is passed to the user program converted to an expose event, paint message, etc.
In Win32 application programming, WindowProc (or window procedure), also known as WndProc is a user-defined callback function that processes messages sent to a window. This function is specified when an application registers its window class and can be named anything (not necessarily WindowProc ).