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[Joris van der Hoeven <address@hidden>]

Hi,

On Karl's request, I forward an example about how to write
an interface with maple, which should work for all versions >= 8.

Best wishes, Joris

---------- Forwarded message ----------
Date: Wed, 14 Jul 2004 11:58:24 -0400
From: Laurent Bernardin <address@hidden>
To: address@hidden
Subject: Maple API


Dear Joris,

It was good talking to you at ISSAC.

I've appended some code that shows how to build an alternative UI on top
of Maple using the OpenMaple API. The help page ?OpenMaple,Examples
shows how to build this example app.
I've only looked at Maple 9.5 but I am pretty sure this will work in
Maple 8. I am also pretty sure it won't work prior to Maple 8, unfortunately.

best regards

        -Laurent

============= omexample.c ====================

/* ***********************************************************************
 * OpenMaple Example Program
 *
 * Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2003.
 * You are permitted to copy, modify and distribute this code, as long as
 * this copyright notice is prominently included and remains intact. If any
 * modifications were done, a prominent notice of the fact that the code has
 * been modified, as well as a list of the modifications, must also be
 * included. To the maximum extent permitted by applicable laws, this
 * material is provided "as is" without any warranty or condition of any kind.
 *
 * This example program illustrates how to use the OpenMaple API
 * to initialize the Maple kernel, evaluate expressions, access help,
 * and interrupt computations.  Users are encouraged to use and modify
 * this code as a starting point for learning the OpenMaple API.
 *
 *********************************************************************** */
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/types.h>
#include <time.h>

#include "maplec.h"

#ifdef _MSC_VER
#  define CDECL __cdecl
#else
#  define CDECL
#endif

/* global variable used by queryInterrupt() */
static int Interrupted = 0;

/* interrupt signal handler: sets global variable when user hits Ctrl-C */
void CDECL catch_intr( int signo )
{
    Interrupted = TRUE;
    signal(SIGINT,catch_intr);
#ifdef _MSC_VER
    signal(SIGBREAK,catch_intr);
#endif
}

/* interrupt callback: stops computation when `Interrupted' is true */
static M_BOOL M_DECL queryInterrupt( void *data )
{
    if( Interrupted ) {
        Interrupted = 0;
        return( TRUE );
    }
    return( FALSE );
}

/* callback used for directing help output */
static M_BOOL M_DECL writeHelpChar( void *data, int c )
{
    putchar(c);
    return( FALSE );
}

/* callback used for directing result output */
static void M_DECL textCallBack( void *data, int tag, char *output )
{
    printf("%s\n",output);
}

/* simple program to print a prompt, get input, evaluate it,
   and display results
*/
int main( int argc, char *argv[] )
{
    char expr[1000], err[2048];  /* command input and error string buffers */
    MKernelVector kv;  /* Maple kernel handle */
    MCallBackVectorDesc cb = {  textCallBack,
                                0,   /* errorCallBack not used */
                                0,   /* statusCallBack not used */
                                0,   /* readLineCallBack not used */
                                0,   /* redirectCallBack not used */
                                0,   /* streamCallBack not used */
                                queryInterrupt,
                                0    /* callBackCallBack not used */
                            };
    ALGEB dag;  /* eval result (Maple data-structure) */
    int len;

    /* initialize Maple */
    if( (kv=StartMaple(argc,argv,&cb,NULL,NULL,err)) == NULL ) {
        printf("Fatal error, %s\n",err);
        return( 1 );
    }

    /* catch ^C */
    signal(SIGINT,catch_intr);

    printf("    |\\^/|     Maple (Example Program)\n");
    printf("._|\\|   |/|_. Copyright (c) Maplesoft, a division of Waterloo 
Maple Inc. 2003\n");
    printf(" \\OPENMAPLE/  All rights reserved. Maple and OpenMaple are 
trademarks of\n");
    printf(" <____ ____>  Waterloo Maple Inc.\n");
    printf("      |       Type ? for help.\n");

    /* Print a prompt, get a Maple expression, evaluate it,
       print a prompt, get a Maple expression, evaluate it, ... */
    for( ;; ) {
        printf("> ");
        if( !fgets(expr,sizeof(expr),stdin) ) break;

        /* Strip off trailing whitespace (including CR and/or LF). */
        for( len = strlen(expr); len > 0 && isspace(expr[len-1]); --len )
            ;
        expr[len] = '\0';

        if( expr[0] == '?' ) {
            MapleHelp(kv,expr+1,NULL,writeHelpChar,NULL,80,NULL);
        }
        else {
            dag = EvalMapleStatement(kv,expr);
            if( dag && IsMapleStop(kv,dag) )
                break;
        }
    }

    return( 0 );
}