Schneider Optics Web Embedded Server - Manual (Page 81)

Ethernet Developers Guide
840 USE 115 00 Version 1.0 71
B.8 Timers
CSample_View requires to periodically receive a timer message. This message
triggers the CSample_View to transmit a message. Since window timers are a
limited resource, the window associated with CMainFrame class receives the timer
messages. CMainFrame member AddTimerList function will place a window on its
timer list. When CMainFrame processes the WM_TIMER message, it sends each
window on its time list the user defined WM_POLL_INTERVAL message.
MFC calls CSample_View member OnInitalUpdate function when it is first being
created. OnInitialUpdate calls CMainFrameís AddTimerList in order to receive the
WM_POLL_INTERVAL message. MFC architectural framework calls
CSample_View OnPollInterval member function to process this message.
B.9 Transaction Processing
CSample_View transaction processing consists of establishing a connection,
transmitting the request, receiving the response, and displaying the response.
CSample_View uses both a transmit and a receive state machine to advance a
transaction.