Subj : beginner question spidermonkey
To   : netscape.public.mozilla.jseng
From : marian simon
Date : Fri Aug 27 2004 01:02 am

Hi,
I need some help for  implementing the Spidermonkey to my C++-Application.
How can I access variables in my application that are defined in the
javascript?
I have 2 classes, dok and ele, and want to access them from javascript.
Has anyone a good tutorial/sample how to implement  this engine? (I know
already http://www.mozilla.org/js/spidermonkey/ and jsshell)


sample :

----- my javascript : -----

var e1;
var e2;

e1=dokument.getElementById(4);
e2=dokument.getElementById(5);

e2.getName();     // return String  "element 5" -> OK
e1.getName();     // return String "element 5" ->  BAD Pointer ?


----- my C-Applcation : -----

class element {
public:
char name[30];
char* get_name(){return name;};
};

class document{
public:
element* list[10];
};

ele *element;
doc *document;

//
****************************************************************************
*****************
main{
int i;

   //init for my class
   doc= new dokument();
   for(i=0;i<10;i++)
   {
     ele = new element();
     sprintf(tmpstr,"element %d",i);
     strcpy(ele->name,tmpstr);
     doc->list[i] = ele;
   }

   .....bla bla .......javascript  INIT

  glob = JS_NewObject(cx, &global_class, NULL, NULL);
    if (!glob)
        return 1;

   JS_SetGlobalObject(cx, glob);
   if (!JS_DefineFunctions(cx, glob, shell_functions))
        return 1;


    js_element = JS_DefineObject(cx, glob, "element", &element_class, NULL,
0);
    if (!js_element)
        return 1;

    js_dokument = JS_DefineObject(cx, glob, "dokument", &dokument_class,
NULL, 0);
    if (!js_dokument)
        return 1;

    if (!JS_DefineFunctions(cx, js_dokument, dokument_functions))
        return 1;

    if (!JS_DefineFunctions(cx, js_element, element_functions))
        return 1;

    ......RUN
}

//
****************************************************************************
*****************
static JSFunctionSpec element_functions[] = {
 {"getName",getName,          0},
    {0}
};

static JSFunctionSpec dokument_functions[] = {
 {"getElementById",getElementById,          0},
 {"getElementByTagName",getElementByTagName,  0},
    {0}
};

//
****************************************************************************
*****************
static JSBool getName (JSContext *cx, JSObject *obj, uintN argc, jsval
*argv, jsval *rval)
{
char *name;

    name=ele->get_name();  //not good ??
   printf("get_Name() name = %s obj=0x%x argc=%d \n",name,obj,argc);

return JS_TRUE;
}
//
****************************************************************************
*****************
static JSBool getElementById (JSContext *cx, JSObject *obj, uintN argc,
jsval *argv, jsval *rval)
{
int i;
    argc--;
 i=JSVAL_TO_INT(argv[argc]);
 ele=doc->list[i];      //not good ??
 printf("getElementById() ele= 0x%x obj=0x%x\n",ele,obj);
 *rval = OBJECT_TO_JSVAL(js_element);
 return JS_TRUE;
}

.