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I have an application that generates & sends several print jobs to a printer in a specific order. This works fine with any physical printer. However, when I print to a merged pdf document using the Bullzip PDF printer, the page will be merged into the document in a fairly random order, not in the order that they were sent to the printer. If I print the document as several pdfs, the jobs still go to the printer in the right order, but the output pdfs are still generated in a semi-random order.

The problem is that your program hands the jobs off to the spooler. The spooler prints each job in the correnct order to the PDF Printer port. As soon as the printer port has received the job the spooler starts the next job. This can happen before the first job has finished and the resulting order is undefined.

I think you can solve the problem by waiting for the PDF file to be created before you start the next print from your printing application.

Regards,
Jacob