Re: libapl apl_exec results displayed as ?

[Chris Moller]

Sorry, but I have no idea how the interface between freepascal and C libraries works.  If your ⎕io is set to 1, the default, there's certainly no obvious reason for an ASCII 0 to be emitted to stdout.  Does freepascal start foreign code in a separate process?  Without reopening stdout?

On 7/24/22 17:49, 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

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