Exchanges a property between a storage medium and the control.
virtual BOOL ExchangeProp(
LPCTSTR pszPropName,
VARTYPE vtProp,
void* pvProp,
const void* pvDefault = NULL
) = 0;
Parameters
pszPropName
The name of the property being exchanged.vtProp
A symbol specifying the type of the property being exchanged. Possible values are:Symbol
Property Type
VT_I2
short
VT_I4
long
VT_BOOL
BOOL
VT_BSTR
CString
VT_CY
CY
VT_R4
float
VT_R8
double
pvProp
A pointer to the property's value.pvDefault
Pointer to a default value for the property.
Return Value
Nonzero if the exchange was successful; 0 if unsuccessful.
Remarks
If the property is being loaded from the medium to the control, the property's value is retrieved from the medium and stored in the object pointed to by pvProp. If the property is being stored to the medium, the value of the object pointed to by pvProp is written to the medium.
The functions CArchivePropExchange::ExchangeProp, CResetPropExchange::ExchangeProp, and CPropsetPropExchange::ExchangeProp override this pure virtual function.
Requirements
Header: afxctl.h
See Also
Reference
CPropExchange::ExchangeBlobProp
CPropExchange::ExchangeFontProp
CPropExchange::ExchangePersistentProp