F# High Performance by Eriawan Kusumawardhono

Author:Eriawan Kusumawardhono [Kusumawardhono, Eriawan]
Language: eng
Format: azw3, mobi, pdf
Publisher: Packt Publishing
Published: 2017-01-17T16:00:00+00:00

Note

The term message in this message loop is different from the message in a message queue: the message is an encapsulation of a known system event to ease communication of system events. It always happens in loops and can be in the form of a looping queue (circular queue), instead of a queue in a message agent that does not operate in a loop (open ended queue).

For more information about the Windows message loop of Windows API, consult the MSDN Library at:

https://msdn.microsoft.com/en-us/library/windows/desktop/ms644927(v=vs.85).aspx

It is common in Windows API to have this message loop of calling GetMessage, coded like this (this code is in C++):

while(GetMessage( &msg, hWnd, 0, 0) != 0) { if (bRet == -1) { // handle the error and possibly exit } else { TranslateMessage(&msg); DispatchMessage(&msg); } }

The preceding code will always loop by examining any incoming Windows WM_XXX messages. It will end the loop if there are implied errors, especially system errors. This common practice is also used in built-in Windows applets, such as the applets in the Control Panel (compiled as .cpl).

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