Executing a batch printing, blank file name PDF will be generated uncertainly


I have a engine that will execute a batch printing job. When I pass the printer name (PDFCreator) to the engine, it will start print files. It is very strange that one file will be printed with a empty file name uncertainly. For this situation sometimes occurred, sometimes not. So could you please help me on this point? Thanks!


are all files printed from the same application?
Otherwise there might be a filetype with a default application which doesn’t pass the required information to the printer. Are you using the token?

best regards,