Serializes or initializes the state of a control's version information.

BOOL ExchangeVersion(
   CPropExchange* pPX,
   DWORD dwVersionDefault,
   BOOL bConvert = TRUE 


A pointer to a CPropExchange object. The framework supplies this object to establish the context of the property exchange, including its direction.


The current version number of the control.


Indicates whether persistent data should be converted to the latest format when saved, or maintained in the same format that was loaded.

Nonzero of the function succeeded; 0 otherwise.

Typically, this will be the first function called by a control's override of COleControl::DoPropExchange. When loading, this function reads the version number of the persistent data, and sets the version attribute of the CPropExchange object accordingly. When saving, this function writes the version number of the persistent data.

For more information on persistence and versioning, see the article ActiveX Controls: Serializing.

Header: afxctl.h

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