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MFGetAttributeDouble function

Returns a double value from an attribute store, or a default value if the attribute is not present.

Syntax


double MFGetAttributeDouble(
  _In_  IMFAttributes *pAttributes,
  _In_  REFGUID guidKey,
  _In_  double fDefault
);

Parameters

pAttributes [in]

Pointer to the IMFAttributes interface of the attribute store.

guidKey [in]

GUID that identifies which value to retrieve.

fDefault [in]

Default value to return if the attribute store does not contain the specified attribute.

Return value

Returns a double value.

Remarks

This helper function queries the attribute store for the attribute specified by guidKey. If the attribute is not present or does not have type double, the function returns fDefault.

This function is convenient because it never returns a failure code. However, if the attribute in question does not have a meaningful default value, you should call IMFAttributes::GetDouble and check for MF_E_ATTRIBUTENOTFOUND.

Requirements

Minimum supported client

Windows Vista [desktop apps | Windows Store apps]

Minimum supported server

Windows Server 2008 [desktop apps | Windows Store apps]

Header

Mfapi.h

See also

IMFAttributes::GetDouble
Media Foundation Functions
Attributes and Properties

 

 

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