Thank you for your post.
Aspose.BarCode allows you to export barcode image to multiple formats including: BMP, EMF, GIF, JPEG, PNG, TIFF and WMF. Therefore, it's easy to insert barcode image into pdf file or Crystal report, we also provide samples to demostrate how to insert barcode into pdf file using Aspose BarCode and PDF component, the winform demo is include in the install package and for the webform version, you can refer from the link below:
For your second question, i am sorry that i was not sure that if there is a BarCode Reader can satisfy your need, but i am very glad to try to do some search about this issue.For pdf file, i think you can get the image objects from the document using a component like Aspose.Pdf.Kit first, and then pass it to a reader that can identify BarCode images to retrieve the information.
Thanks again and please feel free to let me know if you have any question.