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ISectionList::GetSectionData

  • Artículo
 
Microsoft DirectShow 9.0

ISectionList::GetSectionData

The GetSectionData method retrieves a section.

Syntax

  HRESULT GetSectionData(
  WORD  sectionNumber,
  DWORD*  pdwRawPacketLength,
  PSECTION*  ppSection
);

Parameters

sectionNumber

[in]  Specifies the section number to retrieve, indexed from zero. Call the GetNumberOfSections method to get the number of sections.

pdwRawPacketLength

[out]  Receives the size of the section data, in bytes.

ppSection

[out]  Address of a variable that receives a pointer to a SECTION structure, containing the section data. Do not free the memory for the structure; the object frees the memory when the interface is released.

Return Values

The method returns an HRESULT. Possible values include those in the following table.

Return code Description
E_ACCESSDENIED The request has not completed yet.
E_POINTER NULL pointer argument.
MPEG2_E_OUT_OF_BOUNDS The section number is out of range.
S_OK The method succeeded.

Remarks

The section header is converted from network byte order to native byte order. The number of header bytes that are converted depends on the header type. The header types are short header (SECTION structure), long header (LONG_SECTION structure), or DSM-CC header (DSMCC_SECTION structure). If the section has a short header, the first three bytes are converted; for a long header, the first eight bytes are converted; and for a DSM-CC header, the first 20 bytes are converted.

The body of the section data, after the header, is left unparsed and unconverted.

Requirements

Header: Include Mpeg2data.h.

See Also