How to use the SetTimer function

Method 1: When using under the console or where there is no window:

 

Sample code:

void CALLBACK TimerProc (HWND hWnd, UINT nMsg, UINT nTimerid, DWORD dwTime)

{

SYSTEMTIME sys;

GetLocalTime (& sys);

printf ("M / d / d d: d: d.d xingqi \ n", sys.wYear, sys.wMonth, sys.wDay, sys.wHour, sys.wMinute, sys.wSecond, sys.wMilliseconds, sys.wDayOfWeek);

}

void main ()

{

MSG msg;

SetTimer (NULL, 230,4000, (TIMERPROC) TimerProc);

while (GetMessage (& msg, NULL, NULL, NULL))

{

if (msg.message == WM_TIMER)

{

TranslateMessage (& msg);

DispatchMessage (& msg);

break; // It's best to have one here, otherwise it looks like Killtimer can't end the timer.

}

}

KillTimer (NULL, 230);

}

 

Lesson: At the beginning, I thought that there was no need to set a message loop, so there was no write loop, and as a result, the execution program immediately exited.

 

 

Method two:

 

Using the message mechanism provided by MFC, the following two functions are mainly used.

 

WINUSERAPI

UINT_PTR

WINAPI

SetTimer (

__in_opt HWND hWnd,

__in UINT_PTR nIDEvent,

__in UINT uElapse,

__in_opt TIMERPROC lpTimerFunc); // Set it to NULL, that is, use the system default callback function

 

 

WINUSERAPI

BOOL

WINAPI

KillTimer (

__in_opt HWND hWnd,

__in UINT_PTR uIDEvent);

 

 

   If the last parameter of the SetTimer function is NULL, the timer event is processed by the WM_TIMER message processing function. The method for adding a handler function for the WM_TIMER message is to find the class to add a timer in the Class View of the VS2010 project, right-click, select Properties, display its property page, and then click the Messages button on the property page toolbar. The list lists all the messages, finds the WM_TIMER message, and adds a message processing function.

 

Note: If there is only a single SetTimer timer, you can respond to the WM_TIMER message during function processing, thereby adding message processing code.