ulFilter (ULONG) - input

Filter.

Message-filter code passed to the message-filter hook. This can be an application-specific value or one of the following standard MSGF_* values:

MSGF_DIALOGBOX

Dialog-box mode loop.
MSGF_TRACK
Window-movement and size tracking. When this hook is used the TRACKINFO structure specified the ptiTrackinfo parameter of the WinTrackRect function is updated to give the current state before the hook is called. Only the rclTrack and the fs parameters are updated.
MSGF_DRAG
Direct manipulation mode loop.
MSGF_DDEPOSTMSG
DDE post message mode loop.

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