I should have said both j and jqt can call each other directly using the visible dllexport function name as entry points. jlib.h in jsource repos and gl2.ijs etc in qt ide addon. The function prototype of gl2 are listed in gl2.ijs of qt ide.
gl2class.h is the implementation already. If you look at gl2.cpp it includes gl2class.h. However I am puzzled, if you write your frontend then jqt won't be used at all. You need to implement your own gui functions including gl2.. On Tue, Apr 18, 2023, 12:57 AM Michal Wallace <michal.wall...@gmail.com> wrote: > Thanks Bill. > > I have JWd working now, but I'm a little confused about what you're trying > to tell me about jQT. > > You're saying that jqt can call j.dll directly, but what does that have to > do > with J calling functions defined in the frontend? > > How does jgl2 (for example) get the address of the corresponding c/c++ > function? > > I see wd/gl2class.h in the qtide repo, and I see glcmds inside it, and I > see that gl2.h > marks a bunch of functions as "DllExport" but I don't yet see any place > where some > J script puts all the pieces together and tells it to look in the jqt.dll > to get the > implementation of jgl... (assuming that's what happens) > > Where should I look? > > > On Sat, Apr 15, 2023 at 7:40 PM bill lam <bbill....@gmail.com> wrote: > > > Jqt doesn't use 11!:x because it can call j.dll (libj.so) directly. Each > > value of x in 11!:x is exposed as a c function in the frontend. If your > > frontend is implemented in c/c++, then you can do the same without using > > 11!:x. > > > > However jandroid uses 11!:x interface because libj is C while jandroid is > > written in java. The interface between java and C needs a jni wrapper, > > therefore it is more convenient to reduce the number of interface calls > by > > using 11!:x callback. > > > > In the prototype of Jwd, the pres the pointer of of result A (pointer to > an > > AD structure), typically the AD structure is allocated by the frontend > > using Jga api (see jlib.h). > > > > You need not bother with the AC field. > > The AR (rank) contains other information in its high bits so that you > must > > mask it to the lowest 7 bits only (though it seems safe enough to mask > the > > lowest 8 bits, Henry should know better here). > > > > You can browse the jandroid repository and also the io.c and andjnative.c > > in jsource repository. > > > > On Sun, 16 Apr 2023 at 6:36 AM Michal Wallace <michal.wall...@gmail.com> > > wrote: > > > > > 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 > > > > > ---------------------------------------------------------------------- > > 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
