Win32 Timer with Callback function

Timer with Callback procedure using CreateTimerQueueTimer()

 

The prototype of CreateTimerQueueTimer supported by after windows 2000

BOOL WINAPI CreateTimerQueueTimer(
  __out     PHANDLE phNewTimer,
  __in_opt  HANDLE TimerQueue,
  __in      WAITORTIMERCALLBACK Callback,
  __in_opt  PVOID Parameter,
  __in      DWORD DueTime,
  __in      DWORD Period,
  __in      ULONG Flags
);

 

1. phNewTimer : the handler that you want to use, ex) GetCurrentThread() means put the new-timer into the current thread.

2. HANDLE TimerQueue : Optional, usually NULL , if it's null use a default Queue. 

3. WAITORTIMERCALLBACK Callback : put the name of Callback function, the prototype of the Callback function is

   VOID CALLBACK WaitOrTimerCallback( __in  PVOID lpParameter, __in  BOOLEAN TimerOrWaitFired );

4. Parameter : the parameter going to CALLBACK function int "lpParameter" (See above)
5. Duetime : the amount of time in milliseconds relative to the current time, usually it's "0"
6. Period : the period of the timer, in millisecond.(Elapse time)
7. Flags : WT_EXECUTEDEFAULT, WT_EXECUTEINPERSISTENTTHREAD(very useful)

 

Example by Sebeom Park

 

struct ownDateSystem // Sebeom defined this. { int date; } oDate; char str[9]; // to save current SystemTime SYSTEMTIME st; // to get CurrentLocalTime of the system. void CALLBACK TimerProc(PVOID lpParametar,BOOLEAN TimerOrWaitFired) // it works perfectly well { int currentTime = GetCurrentLocalTime(st); struct ownDateSystem *reservedStructure = (ownDateSystem *)lpParametar; // casting from PVOID to "ownDateSystem" int reservedTime = reservedStructure->date; if(currentTime == reservedTime) { RunProcess("C:\\HNC\\Hwp70\\Hwp.exe",NULL); } else return; // MessageBox(NULL,"Hello","Hello",MB_OK); } unsigned int GetCurrentLocalTime(SYSTEMTIME &st) // get CurrentTime { unsigned int currentTime; GetLocalTime(&st); wsprintf(str,"%d%d%d%d",st.wMonth,st.wDay,st.wHour,st.wMinute); // get the formet Month/Day/Hour/Min currentTime = atoi(str); // change the string to int return currentTime; } BOOL AddTimer(unsigned int setDate, HWND hWnd) // for testing.. practice { oDate.date = 923038; HANDLE currentHandler = GetCurrentThread(); CreateTimerQueueTimer(&currentHandler,NULL,TimerProc,&oDate,0,300,WT_EXECUTEDEFAULT); // Get Current Thread //wsprintf(str,"%d %d %d %d",st.wMonth,st.wDay,st.wHour,st.wMinute); return TRUE; }