not entirely sure since I haven't written libapl myself. However, looking
at the code it seems to me as if apl_exec returns an APL error code (most
likely as per Error.def) if it fails.
To capture the APL result I suppose you have to print in the _expression_ or
install a result_callback (just guessing), see API description in libapl.h
BTW the libapl API is C while GNU APL is C++.
Best Regards,
Jürgen
On 7/24/22 11:49 PM, enz...@gmx.com
wrote:
Hi i can see you code is c++I am working with libapl with fpc (freepascal) and i can capture stdout and stderr fine in fpc coding but the only stdout i get from ap_exec is the 0 i have apl_exec as a function and tried with either of the following definitions function apl_exec(p : pchar) : longint; cdecl; // gives good results displayed but stdout captures only 0 function apl_exec(p : pchar) : ansistring; cdecl; // gives nothing to screen with apl_exec nor any stdout On Sun, 24 Jul 2022 17:16:10 -0400 Chris Moller <mol...@mollerware.com> wrote:apl_exec() can output to both stdout and stderr. I use: std::stringstream outbuffer; std::streambuf *coutbuf = std::cout.rdbuf(); std::cout.rdbuf(outbuffer.rdbuf()); std::stringstream errbuffer; std::streambuf *cerrbuf = std::cerr.rdbuf(); std::cerr.rdbuf(errbuffer.rdbuf()); execerr = apl_exec (cmd.toStdString ().c_str ()); std::cout.rdbuf(coutbuf); std::cerr.rdbuf(cerrbuf); outString = QString (outbuffer.str ().c_str ()); errString = QString (errbuffer.str ().c_str ()); On 7/24/22 16:12, enz...@gmx.com wrote:hello What does libapl output?- the apl_exec function returns 0 to stdout but what is the actual display? for example apl_exec('⍳20') what/where is the 1 to 20 displayed so it can be captured? thanks
