C / C++ / MFC

CPallini wrote:

a bit confused

static HANDLE gDoneEvent;
static HANDLE hTimer = NULL;
static HANDLE hTimerQueue = NULL;
int arg = 123; //will be passed to callback of timer


VOID CALLBACK TimerRoutine(PVOID lpParam, BOOLEAN TimerOrWaitFired)
{
    if (lpParam == NULL)
    {
        //do some error handling her
        return;
    }
    else
    {
        if(s_user_function!=nullptr)
            s_user_function(12);
    }
    //SetEvent(gDoneEvent);   //for periodic calls, don't set gDoneEvent
}

char timer_init(void)
{   
    // Use an event object to track the TimerRoutine execution
    gDoneEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
    if (NULL == gDoneEvent)
    {
        return 1;
    }
    // Create the timer queue.
    hTimerQueue = CreateTimerQueue();
    if (NULL == hTimerQueue)
    {
        return 2;
    }
    CreateTimerQueueTimer(&hTimer, hTimerQueue, (WAITORTIMERCALLBACK)TimerRoutine, &arg, 3000, 10000, 0);

    WaitForSingleObject(gDoneEvent, INFINITE); //if we don't wait it crashes although handles are stored globally?
        
    //the handles should be closed and deleted only after timer had occured. 

    ////CloseHandle(gDoneEvent);
    ////// Delete all timers in the timer queue.
    ////if (!DeleteTimerQueue(hTimerQueue))
    ////    printf("DeleteTimerQueue failed (%d)\n", GetLastError());
}

Bodo2407 wrote:

I need the dll running, not waiting inside a fucntion for a timer..

Quote:

EACCES The given path is a directory, or the file is read-only, but an open-for-writing operation was attempted.

using RetType = std::typename invoke_result_t<Func, Args...>;

using RetType = std::typename invoke_result_t<Func, Args...>;

using RetType = typename std::invoke_result_t<Func, Args...>;

using RetType = typename std::invoke_result_t<Func, Args...>;