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Reads LONG values in a property set.
HRESULT ReadDLONG ( 
   PROPID id,
   LONG*  pValue
);
Parameters
- id 
 [in] Identifier of the property to be read (PROPID is defined in WTypes.h as a ULONG).
- pValue 
 [out] Returns the property value.
Return Value
If successful, returns S_OK; otherwise returns an error code. Returns E_INVALIDARG if the property is not of type LONG.
Remarks
A LONG is defined by Windows as a 32-bit signed integer.