c++ - CListCtrl class override and OnTimer -

i'm not sure if i'm doing undocumented. created own class derived clistctrl , overrode ontimer handler in it:

void clistctrl2::ontimer(uint_ptr nidevent) {     // todo: add message handler code here and/or call default      switch(nidevent)     {     case my_timer_id:         {             //do processing             domyprocessing();         }         break;      default:         {             //default             clistctrl::ontimer(nidevent);         }         break;     } } 

but seems strange me ontimer() routine called timer ids not mine. instance, quick debugger checkpoint research turns out default handler called nidevent set 45 , 43.

are there timer ids reserved should avoid using myself?

from clistctrl documentation see text:

also see:

• knowledge base article q200054: prb: ontimer() not called repeatedly list control

and article, pertinent excerpts:

if call settimer function send periodic wm_timer messages list control, may find wm_timer message handler (the ontimer function) list control called twice.

....

the list control uses timer editing labels, , scrolling. when handle timer message, if timer id own timer, don't call default handler (clistctrl::ontimer).

so, confirms observe. list control uses timer. can find no documentation specific ids used. guess microsoft not wish commit documenting specific ids used. regard control's implementation private , wish retain option of using more timer ids in future versions. iinspectable points out, have done reserving range of ids.

my recommendation regard list control's timer out of bounds, , reserved use control. derived class, use different timer. create message window , use receive timer events. can subclass cwnd achieve this.