Gary, It isn't the QR codes that I have a problem with, I've sorted out all the coding for that myself in C# so I can create, read and print them no problem. I just want to be able to:
1. Pass the finished QR code (image) back to VFP from the ActiveX/DLL so I can use it in reports as per standard VFP image control. i.e what do I pass back? Memory Stream, blob string etc etc... I don't know. 2. Pass a document to my "ActiveX/DLL" and pass back the QR Code content as a string. I can already do this if I just pass in the location of the QR Code image to my ActiveX as I have worked out how to expose properties and methods to VFP from it. I guess I could convert the image to a string FiletoStr() and pass that in for this purpose unless anyone else has any better ideas. Dave -----Original Message----- From: ProFox [mailto:[email protected]] On Behalf Of GaryT Sent: 19 November 2012 17:38 To: ProFox Email List Subject: Re: QR Codes in VFP Dave, You will have to determine precisely what you're being given to work with. Then either study the official JPEG/JFIF Standards, find the standard that governs the file you're reading and from that determine precisely where within the file the info is stored, and extract it... (the Standards are not light reading) OR simply ask the file creator/publisher where in the file is the data OR do it the way I did it once by converting the entire file to ASCII and examining the result. Once you have the required offset the rest will be relatively straightforward. Years ago as part of a larger job I had to determine the exact dimensions of a JPEG/JFIF so that a VFP window could be created, for display etc. I avoided the search through the official JPEG Standards; that would have been a nightmare. Instead, using VFP low-level functions I converted the entire file from HEX to ASCII, found what I thought looked like the dimensions (in pixels from memory) and then ran the same test on many other files. They all had the same info stored at exactly the same offset and the rest of the job was easy. Since QR codes are relatively new, I think you'll have more luck with the file publisher - they MUST know exactly where in the file this data is being placed, and it will be consistent. It's possible the official Standards haven't even caught up with the outside world, so I would begin with the file creator/publisher anyway. GaryT On 20/11/12 02:59, Dave Crozier wrote: > I have developed a QR Code print/read application in C# including a library > that does all the encoding/decoding. I use a canvas to produce the QR code on > and can decrypt a QR code embedded in a JPG or PNG. > > I now want to produce an ActiveX/dll that VFP can use in reportsin order to > print out QR codes on a VFP report and I'm at a loss on how/what to pass > back to VFP from the ActiveX. > > As for the physical activeX, I have no problem creating it in C# and have a > template that can send back numerics or strings as properties in the ActiveX > from C# so that VFP can receive them, I just have no idea where to look to > get an feel for what I should send back to VFP e.g Stream, string etc. Any > ideas, or help on where to look? > > Dave [excessive quoting removed by server] _______________________________________________ Post Messages to: [email protected] Subscription Maintenance: http://mail.leafe.com/mailman/listinfo/profox OT-free version of this list: http://mail.leafe.com/mailman/listinfo/profoxtech Searchable Archive: http://leafe.com/archives/search/profox This message: http://leafe.com/archives/byMID/profox/[email protected] ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.
