Schedule a task

danielhan

Now open a thread under a common class, as follows:
void CTest :: testFunc ()
{
    while (flag == TRUE)
    {
           if (there are images in the buffer)
                Display the image;

           Sleep (100);
    }

}

problem:
1. In this way, it is possible to display an image every 100ms (of course, there must be an image in the buffer at this time). I wonder if this can achieve a timing display function? Is this different from using a timer? Will it receive interference from other threads?

2. If there is no image in the buffer when it is ready to be displayed, it will definitely not be displayed at this time. You must wait another 100ms before coming over to check the display. But it is very likely that there is an image in the buffer 10ms after the condition is judged, so that the image display is not real-time. I wonder if there is any solution to this?


Thank you all! !! !!

cj_counter

1. What flag is flag?
2. Is testFunc () executed non-stop? Otherwise, what happens if flag = false exits? So this period cannot be displayed regularly, its display is restricted by flags, etc. Only when they are satisfied, can 100ms be considered The timer does not have the above problem.
3. It is best to control the start of drawing through the flag bit of the buffer
personal opinion for reference only:)

rsq666

Events should be used to drive the display image.

hejian2

while (flag == TRUE)
    {
           if (there is an image in the buffer)
             {
                Display the image;
                Sleep (100);
              }
    }
Can solve the second problem

2511718

The difference between sleep and Timer is that Sleep is stuffed, while Timer does not.

You can use the timer to check every second, if there is data to draw immediately.

joe2086

It ’s better to use the message, you must know if there is any image, and then send a message to OnDraw

qinzhen100

Then sleep (1)

sky_hexia

Should be likersq666said

Use Event to achieve

CreateEvent(...) creates an event object and uses SetEvent(...) to wake you up when the image arrives