Subj : Can't get JS_CallFunction to work
To   : netscape.public.mozilla.jseng
From : c_ibrahim
Date : Mon Oct 25 2004 03:22 am

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

.