| Constant | Description |
|---|---|
lock_failed | Couldn't get the lock; it's not time to update yet. |
lock_ok | Locked; you can update. |
lock_ok_frames_dropped | Lccked; you can update, but you may have missed some buffers. |
LockNextPage() and LockForCyclic()). If either function returns lock_failed, there isn't a buffer to be filled; your code is pushing buffers too fast.lock_ok is returned, the next buffer is ready. The lock_ok_frames_dropped result is received if a buffer is available but some buffers have been lost; this can happen if you're not pushing fast enough.