Subj : Re: Can't get JS_CallFunction to work - OK. Works now :)
To   : netscape.public.mozilla.jseng
From : c_ibrahim
Date : Mon Oct 25 2004 08:30 am

Hi,

Pls ignore the previous mail. Managed to get it work :)

cath



c_ibrahim@yahoo.com (c.ibrahim) wrote in message news:<b9eb5a3b.0410250122.525bb12e@posting.google.com>...
> Hi,
> 
> I saw a similar question posted like 3-4 months ago, but I cannot get
> much from the answer so I post this question again.
> 
> I need to use a function many a times so I decide to use
> JS_CompileFunction once and call the function many times using
> JS_CallFunction. I wanna make sure the idea works so I implement a
> simple test code, which to my dismay, does not work..
> 
> 
> the code snippet:
> 
> //somewhere in class constructor
> ...
> JSContext* m_context = JSNewContext(
> JSObject* m_global = JS_NewObject(
> 
> 
> //in class function that contains the simple test code
> ...
> long grade = -1;
> 
> //compile function
> const char* Grade = "function grade() { return 10 }";
> const char* filename = 0;
> uintN lineno = 0;
> JSFunction* func = JS_CompileFunction(m_context, m_global, "grade", 0,
> 0, Grade, strlen(Grade), filename, lineno);
> 	
> //call function
> if (0!=func)
> {
>    jsval rval;
>    if (JS_TRUE == JS_CallFunction(m_context, m_global, func, 0, 0,
> &rval))
>    {
>       if (JS_FALSE == JS_ValueToInt32(m_context, rval, &grade))
>       {
>          cout << "FAILS! AARCK!!";
>       }
>    }
> }
> ...
> 
> func != 0, so I assume JS_CompileFunction works fine.
> JSCallFunction returns JS_TRUE, so I assume it works fine there as
> well.
> BUT, rval returns -2147483647 (undefined, I suppose?)
> JS_ValueToInt32 then returns JS_FALSE
> 
> I completely have no clue what goes wrong here. Plz help..
> 
> thanks in advance,
> cath

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