IMFAttributes::GetAllocatedBlob method (mfobjects.h)

  • Article

Retrieves a byte array associated with a key. This method allocates the memory for the array.

Syntax

HRESULT GetAllocatedBlob(
  [in]  REFGUID guidKey,
  [out] UINT8   **ppBuf,
  [out] UINT32  *pcbSize
);

Parameters

[in] guidKey

GUID that identifies which value to retrieve. The attribute type must be MF_ATTRIBUTE_BLOB.

[out] ppBuf

If the key is found and the value is a byte array, this parameter receives a copy of the array. The caller must free the memory for the array by calling CoTaskMemFree.

[out] pcbSize

Receives the size of the array, in bytes.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code Description
S_OK
 The method succeeded.
MF_E_ATTRIBUTENOTFOUND
 The specified key was not found.
MF_E_INVALIDTYPE
 The attribute value is not a byte array.

Remarks

To copy a byte array value into a caller-allocated buffer, use the IMFAttributes::GetBlob method.

This interface is available on the following platforms if the Windows Media Format 11 SDK redistributable components are installed:

  • Windows XP with Service Pack 2 (SP2) and later.
  • Windows XP Media Center Edition 2005 with KB900325 (Windows XP Media Center Edition 2005) and KB925766 (October 2006 Update Rollup for Windows XP Media Center Edition) installed.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2008 [desktop apps | UWP apps]
Target Platform Windows
Header mfobjects.h (include Mfidl.h)
Library Mfuuid.lib

See also

Attributes and Properties

IMFAttributes

MF_ATTRIBUTE_TYPE