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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.

Return Value

Nonzero if the exchange was successful; 0 if unsuccessful.

Remarks

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.

See Also

MFC Macros and Globals | COleControl::DoPropExchange

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