General WIA Utility Functions

You can use the following functions to retrieve the driver item context, retrieve information from the system registry, and copy a string.

Function	Description
wiauGetDrvItemContext	Gets the driver item context and, optionally, the driver item.
wiauGetResourceString	Gets a resource string, storing it as a BSTR.
wiauGetValidFormats	Calls the IWiaMiniDrv::drvGetWiaFormatInfo method and makes a list of valid formats, using a specified TYMED value.
wiauPropInPropSpec	Determines whether a specified property specification identifier (ID) is contained in an array of such values. The function optionally gets the index where the property specification ID was found.
wiauPropsInPropSpec	Determines whether any of a list of property specification IDs is contained within an array of such values.
wiauRegGetDword	Gets a DWORD value from the DeviceData section of the registry.
wiauRegGetStr	Gets a string value from the DeviceData section of the registry.
wiauRegOpenData	Opens the DeviceData registry key.
wiauSetImageItemSize	Calculates the size and width, in bytes, for an image, based on the current WIA_IPA_FORMAT setting, and writes the new values to the appropriate properties.
wiauStrC2C	Copies an ANSI character string to another ANSI character string.
wiauStrC2W	Converts an ANSI character string to a Unicode string.
wiauStrW2C	Converts a Unicode string to an ANSI character string.
wiauStrW2W	Copies a Unicode string to another Unicode string.