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Gets the value of a field of type SYNC_METADATA_FIELD_TYPE_GUID.
HRESULT GetGuidValue( GUID * pValue);
[out] Returns the value of the field.
S_OK
S_FALSE if the value has not been set.
E_POINTER
SYNC_E_METADATA_FIELD_INVALID_TYPE when this field is not of type SYNC_METADATA_FIELD_TYPE_GUID.