wiasIsPropChanged function (wiamdef.h)
The wiasIsPropChanged function tests whether a specified property has been changed by an application.
Syntax
HRESULT wiasIsPropChanged(
PROPID propid,
[in] WIA_PROPERTY_CONTEXT *pContext,
[out] BOOL *pbChanged
);
Parameters
propid
Specifies the property identifier of the property to be checked.
[in] pContext
Pointer to a WIA_PROPERTY_CONTEXT structure that contains the current property context.
[out] pbChanged
Pointer to a memory location that receives a BOOL value. The BOOL value is TRUE if the property changed, and FALSE if the property did not change.
Return value
On success, the function returns S_OK.
If the function fails, it returns a standard COM error or one of the WIA error codes.
Remarks
This function determines whether a property is being changed by looking at the bChanged member value in the property's WIA_PROPERTY_CONTEXT structure. Minidrivers typically use this function to check when an independent property has been changed so that its dependents can be updated.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Desktop |
| Header | wiamdef.h (include Wiamdef.h) |
| Library | Wiaservc.lib |
| DLL | Wiaservc.dll |