HP-41 Literature - German
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11-26-2014, 10:25 AM
(This post was last modified: 11-27-2014 11:19 AM by Martin Hepperle.)
Post: #7
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RE: HP-41 Literature - German
(11-12-2014 08:35 PM)aurelio Wrote: Did you try to read with a wand any of the barcodes printed from your scan? Aurelio, this is interesting. Unfortunately I don't have a HP-41 with wand. That was the reason why I wanted to develop my own solution. I tested the barcode printed from my program as follows: - printed to a PDF file (Acrobat PDF Writer) - exported via Acrobat to a PNG image - re-read the PNG images with my program (no checksum errors) - I read the resulting .p41 program file into the V41 emulator. I think that my checksum code in the reader portion is correct as it works nicely for all barcodes I copied from books, PPC, other barcode printers etc. As I can read back my own barcodes I think that the checksum algorithm would also be o.k. Concerning the bar dimensions I followed very closely the HP documentation so this should be o.k. too. But: after reading your comments I crosschecked my code and I found an error in the calculation of the number of bytes for commands broken at the end of a barcode row and continued on the next row. I have now (27 Nov) updated the .zip archive accordingly with a fixed version. Maybe you can give this another try? Questions: - do you have the possibility to print to a PNG file or produce a PNG file via Postscript and Ghostscript/Ghostview? Then you could re-read the barcodes with my program to check whether this works for you as in my case. - can you send my your problem program in RAW, DAT or HEX format and tell me which rows pose a problem when reading back? I could then compare the barcode images with bar copdes produced by other programs. Martin |
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Messages In This Thread |
HP-41 Literature - German - Martin Hepperle - 11-07-2014, 02:00 PM
RE: HP-41 Literature - German - Marcus von Cube - 11-07-2014, 03:36 PM
RE: HP-41 Literature - German - aurelio - 11-12-2014, 08:35 PM
RE: HP-41 Literature - German - Martin Hepperle - 11-26-2014 10:25 AM
RE: HP-41 Literature - German - Karl-Ludwig Butte - 11-13-2014, 08:16 AM
RE: HP-41 Literature - German - Martin Hepperle - 11-14-2014, 03:34 PM
Update: HP-41 Literature - German - Martin Hepperle - 11-26-2014, 09:30 AM
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