Update choose field
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From: Gurveer on 24 Feb 2010 03:18 Hello all I recently ran into a problem where I had to update the choose field in an inputform. I'm using the ^IfMain engine on my HP 50g. Say I have four values namely, "a", "b", "c" and "d', any two of which I need to know. I'm using four fields, two choose and two corresponding text fields. At the beginning of inputform, first field contains all the values and displays "a" initially whereas the second field contains the last three values viz., "b", "c" & "d" and displays "b" as the default value. Is it possible to update the second field to contain just "c" & "d" if the value in the first field is changed to say "b"? I used message handler 5 (IfMsgSetFieldValue) to update the value of another field based on the change in the current field. This solves a part of the problem by updating the display to a different field value as I need the initial choose field data to be overwritten by the updated one. Although I understand that some code can be written to check that the fields are unique after the inputform has been terminated by the user, but I was just wondering if updating the choose field data was a possibility. Thanks for your time! Regards, Gurveer
From: Andreas Möller on 24 Feb 2010 06:00 Hello, > Is it possible to update the second field to contain just "c" & "d" if > the value in the first field is changed to say "b"? Yes, this is possible. Just extend your message handling. Almost all messages are documented in informbox.h which comes with debug4x. You can have a message handler for the whole from and a message handler for each field and you can handle as much message in each as you like and mix them. Naturally your form/field will get slower the more messages you handle. HTH, Andreas http://www.software49g.gmxhome.de/
From: Gurveer on 25 Feb 2010 00:21 On Feb 24, 4:00 am, Andreas Möller <andreas_moellerNOS...(a)gmx.de> wrote: > Hello, > > > Is it possible to update the second field to contain just "c" & "d" > if > > the value in the first field is changed to say "b"? > Yes, this is possible. Just extend your message handling. > Almost all messages are documented in informbox.h which comes with > debug4x. > > You can have a message handler for the whole from and a message > handler for each field and you can handle as much message in each as > you like and mix them. Naturally your form/field will get slower the > more messages you handle. > > HTH, > Andreashttp://www.software49g.gmxhome.de/ Yeah, you are right, did it by manipulating the virtual stack. But something which I was wondering upon reading the informbox.h from Debug4x that it suggests to see RPLman for more information on that ^IfMain flash pointer. I pulled it out from: http://www.hpcalc.org/details.php?id=1745 Upon searching the document, didn't really find anything about ^IfMain. Moreover, informbox.h also talks about entries like IfSetFieldInternalValue, IfRefreshField, etc. which are needed to be called by Flash Pointers. I compile my programs using Emacs on HP 50g. I used the basic symbology as FPTR2 ^IfSetFieldInternalValue, but it wouldn't accept it. Surprising! Thanks anyways for your help. Regards, Gurveer
From: Andreas Möller on 25 Feb 2010 04:38 Hello, * Main entry point, see RPLMan for more informations I understand, that this is meant for the POL at which IfMain resides. > Moreover, informbox.h also talks about entries like > IfSetFieldInternalValue, IfRefreshField, etc. which are needed to be > called by Flash Pointers. I compile my programs using Emacs on HP 50g. > I used the basic symbology as FPTR2 ^IfSetFieldInternalValue, but it > wouldn't accept it. Surprising! Like I said informbox.h contains some minor errors and some of the FLASHPTRs described there did not get exported. In this case you have to reprogram them yourself or find the correct PTR and pull them out of the ROM. If you want to study step-by-step how IfMain works you have to do it with debug4x as with it you can single step through it (with some minor code modifcations to a given halt point). Regards, Andreas http://www.software49g.gmxhome.de/
From: John H Meyers on 25 Feb 2010 06:32
On 2/24/2010 11:21 PM, Gurveer wrote: > Something which I was wondering upon reading the informbox.h from > Debug4x that it suggests to see RPLman for more information on that > ^IfMain flash pointer. I pulled it out from: > http://www.hpcalc.org/details.php?id=1745 The original source of the above is: http://www.hpcalc.org/details.php?id=1743 Each of the above links says "RPL Programming Guide from Goodies Disk 4": http://www.hpcalc.org/details.php?id=235 (Goodies Disk 4, compiled by Joe Horn) http://www.hpcalc.org/search.php?query=rplman "RPLman" is actually a plain text document, by HP (Wickes?), published in 1991 (later converted verbatim to a PDF file -- why bother?), at which time the HP48SX was the latest model, and there were not only no such things as "flash pointers," but not even such a thing as an "input form"! [r->] [OFF] |