sandy84 wrote:
Hello all,
I want to create a Windows NT Service which will delete records on
timely interval. So I am using ATL wizard generated code by using
windows services option. In Run() function I want to call the function
which will delete the record on timely interval. So for that the code
is as follows:
HANDLE m_hStop;
m_hStop = ::CreateEvent(0, TRUE, FALSE, 0);
HANDLE hTimerQTimer;
CreateTimerQueueTimer(&hTimerQTimer, NULL, DeleteRecords, NULL, 1000,
60000, WT_EXECUTELONGFUNCTION);
if (::WaitForSingleObject (m_hStop, INFINITE) == WAIT_OBJECT_0)
{
::CloseHandle(m_hStop);
DeleteTimerQueueTimer(NULL, hTimerQTimer, NULL);
I'd pass INVALID_HANDLE_VALUE as the third parameter, to ensure your
callback has finished before you return.
}
where DeleteRecords is the function which is callback function. I am
setting event m_hStop in Handler() function for stop and shutdown. Is
this the right implementation or a better mechanism is possible to
achieve this same thing?
It would be simpler just to use a loop with
WaitForSingleObject(m_hStop, 60000)
and do away with the timer entirely.
Also is it possible that the function
DeleteRecords is member function of some class?
No. The best you can do is pass a static member function, and then pass
"this" as the callback parameter (arg 4 I think). Then the static member
can either call a non-static member, or just do the work itself,
accessing member variables through the parameter (cast to a pointer to
your class's type of course).
Because when I make it
a member function of some class then I get following error:
error C2664: 'CreateTimerQueueTimer' : cannot convert parameter 3 from
'void (void *,unsigned char)' to 'void (__stdcall *)(void *,unsigned
char)' None of the functions with this name in scope match the target
type
Curretly DeleteRecords is defined as:
VOID CALLBACK DeleteRecords(PVOID pvContext, BOOLEAN fTimeout)
Change that to:
static VOID CALLBACK DeleteRecords(PVOID pvContext, BOOLEAN fTimeout)
{
MyClass* pMyClass = static_cast<MyClass*>(pvContext);
//etc.
}
Tom
say after each 10min. The time after which this function has to be
called is yet to be decided. But the most possible value will be near
1hr. So will it be feasible to use WaitForSingleObject(m_hStop,