Inside Macintosh: QuickTime /

Chapter 2 - Movie Toolbox / Movie Toolbox Reference

Functions That Modify Movie Properties / Working With Movie User Data

CountUserDataType

The CountUserDataType function allows you to determine the number of items of a given type in a user data list.

pascal short CountUserDataType (UserData theUserData, 
                                 OSType udType);

theUserData

Specifies the user data list for this operation. You obtain this list reference by calling the GetMovieUserData, GetTrackUserData, or GetMediaUserData function (described on page 2-215, page 2-216, and page 2-217, respectively).

udType

Specifies the type. The Movie Toolbox determines the number of items of this type in the user data list.

DESCRIPTION

The CountUserDataType function returns a short integer that contains the number of items of the specified type in the user data list.

ERROR CODES

None