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Re: libapl stdout

From: Chris Moller
Subject: Re: libapl stdout
Date: Fri, 27 Jan 2023 19:38:51 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0

QString is mmore or less equivalent to the C++ std::string class.

On 1/27/23 18:00, enztec@gmx.com wrote:
what do i replace all the qstring with

/apl/libapl/c > grepi qstring

./aplexec.h:18:aplExec (apl_op_e apl_op, QString &cmd,
./aplexec.h:19:QString &outString, QString &errString);
./libaplc.c:12:AplExec::aplExec (apl_op_e apl_op, QString &cmd,
./libaplc.c:13:QString &outString, QString &errString)
./libaplc.c:29:outString = QString (outbuffer.str ().c_str ());
./libaplc.c:30:errString = QString (errbuffer.str ().c_str ());
./libaplc.c:40:outString = QString (res);
./libaplc.c:44:errString = QString (errbuffer.str ().c_str ());

On Fri, 27 Jan 2023 17:18:01 -0500
Chris Moller <moller@mollerware.com> wrote:

Qt isn't necessary--that's just the environment I'm working in.  From my 
example, get rid of the #include <QtWidgets>line.

Here's aplexec.h:

    #ifndef APLEXEC_H
    #define APLEXEC_H

    #include <QtWidgets>
    #include <apl/libapl.h>

    #define APL_VARIABLE "([⍙∆a-z][⍙∆_a-z0-9]*)"

    typedef enum {
    } apl_op_e;

    class AplExec
      static LIBAPL_error
      aplExec (apl_op_e apl_op, QString &cmd,
               QString &outString, QString &errString);
    #endif // APLEEXEC_H

Again, you don't need the Qt stuff.  Mostly, what you need is the

    #include <apl/libapl.h>

line.  And you probably don't need the #define APL_VARIABLE 
"([⍙∆a-z][⍙∆_a-z0-9]*)" line

For this to work at all, you need to build Jürgen's APL twice, once as 
usual to install apl itself, and a second time with

    ./configure --with-libapl
    make install

(with any other options you need on the configure)

What this does is put apl-related stuff in /usr/local/include and 
/usr/local/lib.  (I think I manually copied Error.def from the apl 
source tree into /usr/local/include--I don't think it gets copied with 
the make install.)

On 1/27/23 16:28, enztec@gmx.com wrote:

i don't have qt installed nor do i have your
#include "aplexec.h"

On Fri, 27 Jan 2023 11:23:08 -0500
Chris Moller<moller@mollerware.com>  wrote:

For what it's worth, in an ongoing project in use:

     #include <QtWidgets>

     #include <iostream>
     #include <sstream>

     #include <apl/libapl.h>

     #include "aplexec.h"

     AplExec::aplExec (apl_op_e apl_op, QString &cmd,
                QString &outString, QString &errString)
       LIBAPL_error execerr = LAE_NO_ERROR;

       switch(apl_op) {
       case APL_OP_EXEC:
           std::stringstream outbuffer;
           std::streambuf *coutbuf = std::cout.rdbuf();
           std::stringstream errbuffer;
           std::streambuf *cerrbuf = std::cerr.rdbuf();
           execerr = apl_exec (cmd.toStdString ().c_str ());
           outString = QString (outbuffer.str ().c_str ());
           errString = QString (errbuffer.str ().c_str ());
       case APL_OP_COMMAND:
           std::stringstream errbuffer;
           std::streambuf *cerrbuf = std::cerr.rdbuf();
           const char *res = apl_command (cmd.toStdString ().c_str ());
           if (res) {
             outString = QString (res);
             free ((void *)res);
           errString = QString (errbuffer.str ().c_str ());

       return execerr;

I.e., I'm capturing stdout and stderr in strings.




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