IAMTimeline::GetCountOfType

  • Article
 
Microsoft DirectShow 9.0

IAMTimeline::GetCountOfType

The GetCountOfType method retrieves the number of objects of the specified type that are contained in a specified group and all of its children.

Syntax

  HRESULT GetCountOfType(
    long Group,
    long *pVal,
    long *pValWithComps,
    TIMELINE_MAJOR_TYPE MajorType
);

Parameters

Group

Index number of the group for which to retrieve the count.

pVal

Pointer to a variable that receives the number of objects of the specified type contained in the group and all of its virtual tracks, recursively.

pValWithComps

Pointer to a variable that receives the count returned in pVal plus the number of compositions searched, including this one.

MajorType

Member of the TIMELINE_MAJOR_TYPE enumerated type, specifying the type of object to count.

Return Value

Returns one of the following HRESULT values.

Return code Description
S_OK Success.
E_INVALIDARG Invalid group number.
E_POINTER NULL pointer argument.

Remarks

Calling this method is equivalent to calling IAMTimelineComp::GetCountOfType on the specified group. See the Remarks section of that method for more information.

Typically, an application will not call this method. It is called internally by the render engine.

Requirements

Header: Include Qedit.h. This header file is not compatible with Microsoft® Direct3D® headers later than version 7.

Library: Use strmiids.lib.

See Also