The WIA_IPS_PRINTER_ENDORSER_VALID_CHARACTERS property lists the characters (letters, digits, punctuation marks, and so on) that are valid for the WIA_IPS_PRINTER_ENDORSER_STRING values that can be configured for the Imprinter/Endorser. The set of valid characters is specified as a NULL-terminated character string. The WIA minidriver creates and maintains this property.
Property Type: VT_BSTR
Valid Values: WIA_PROP_NONE
Access Rights: Read-only
All Imprinter/Endorser items must support all characters that occur in the WIA_IPS_PRINTER_ENDORSER_VALID_FORMAT_SPECIFIERS values (if any), including the '$' character. If the Imprinter/Endorser supports the WiaImgFmt_CSV value for WIA_IPA_TYMED, the ',' (comma) character must not be listed by WIA_IPS_PRINTER_ENDORSER_VALID_CHARACTERS.
This property is optional for all Imprinter/Endorser data source items.