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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

PX_IUnknown 

Call this function within your control's DoPropExchange member function to serialize or initialize a property represented by an object having an IUnknown-derived interface.


BOOL PX_IUnknown(
   CPropExchange* pPX,
   LPCTSTR pszPropName,
   LPUNKNOWN& pUnk,
   REFIID iid,
   LPUNKNOWN pUnkDefault = NULL 
);

Parameters

pPX

Pointer to the CPropExchange object (typically passed as a parameter to DoPropExchange).

pszPropName

The name of the property being exchanged.

pUnk

Reference to a variable containing the interface of the object that represents the value of the property.

iid

An interface ID indicating which interface of the property object is used by the control.

pUnkDefault

Default value for the property.

Nonzero if the exchange was successful; 0 if unsuccessful.

The property's value is read from or written to the variable referenced by pUnk, as appropriate. If pUnkDefault is specified, it will be used as the property's default value. This value is used if, for any reason, the control's serialization process fails.

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