Hrm. That does help a little bit. There's definitely still something called JWd defined in JLib.
Here is what I know so far: (actually more than when I started typing this, so... I'll probably move this to the wiki at some point.) When you write a J frontend, you have to call a function called JSM (session manager) and you pass in the addresses of four callback functions that your frontend implements: JWr -> session calls this to output to whatever "terminal" you set up JWd -> this window driver thing. JRd -> session calls this when it needs to read a line of input ??? -> something reserved for future use? JWd does still seem to be hooked up to 11!:x (weird to see that called x instead of n!) The signature looks like this: int _stdcall Jwd(JS jt, int x, A parg, A* pres, C* loc); -- https://github.com/jsoftware/jsource/blob/master/jsrc/jlib.h#L111 The arguments seem to be: jt -> address of j session object x -> the 'n' in 11!:n parg -> the y argument to (11!n) (a pointer to a J array) pres -> the result array (you modify this to put your return value here) loc -> a locale name (?) There is an example J frontend here: https://github.com/jsoftware/jsource/blob/master/jsrc/jfex.c It has this comment for its implementation of Jwd (which is missing the loc parameter): // J calls for 11!:x y - demonstrates all features of jwdw and jwdp // pa is y and result array (if any) is returned in pz // return pz // 0 - MTM i.0 0 // -1 A - A result // -2 A - A is pairs of null terminated strings for event table // n - EVDOMAIN etc The 'parg' argument has the following fields, which I am expecting to match the structure defined here: https://www.jsoftware.com/ioj/iojNoun.htm k -> "offset of ravel with respect to byte 0 of the array" f -> a flag of some sort m -> "maximum number of bytes in ravel" t -> the type c -> reference count n -> the length of the data r -> rank s -> pointers to shape and value My implementation of Jwd just prints out the arguments... JWd(x:2000, a:[k: 64 f: 0 m: 117321808 t: 2 c: $8000000000000001 n: 5 r: $BAADF00D062E0001]) I guess really my main problem is I don't understand how to interpret the "rank" and "reference count" fields. I'd expect both of these to be small positive integers, like what I see in the ioj. Without the rank, I don't know how to parse the shape and value. Hrm. I guess technically I know from the docs that all (11!:n) are rank 1, so maybe I can just ignore that field? I will investigate further. On Sat, Apr 15, 2023 at 5:01 PM Raul Miller <rauldmil...@gmail.com> wrote: > Jwd sounds like version 6 of J. This predates Jqt. > > There's some docs at > https://www.jsoftware.com/docs/help602/user/win_driver_cmd_ref_overview.htm > > I hope this helps, > > -- > Raul > > On Sat, Apr 15, 2023 at 4:57 PM Michal Wallace <michal.wall...@gmail.com> > wrote: > > > > Hey all, > > > > I've been working on JPrez again -- a console-based presentation tool > > that can record and play back interactions with a J REPL. > > > > It also lets you specify text to be recorded for voice overs to narrate > the > > interaction (for making videos), and over the past week I've embedded > > JPrez inside a windows binary that looks like a normal text console but > > can peek inside JPrez and actually let me record and play audio for > > the individual voice over lines. > > > > However, right now I'm doing everything from the host application. It > polls > > Jprez to see what's on the screen and what the current line of text is > > (jprez suggests a filename for a corresponding wav file). > > > > That all works fine for recording one line at a time, but if I want to > > actually > > play the presentation, I'd much rather have J drive the interaction. > > > > I basically already have a J front end, but I don't know what to do with > > Jwd, > > or how to use it from the J side. I've picked up that it's using 11!:n > > under the > > hood, but I haven't found much information about how it's meant to be > used. > > > > Do any docs exist? > > > > Where should I look in the jsource and jQt code bases to find examples? > > > > Thanks! > > > > -Michal > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
