Subj : JS_CallFunction
To   : netscape.public.mozilla.jseng
From : Adrian M
Date : Thu Jul 15 2004 12:29 pm

Hi...
I have a beginner question:
I'm trying to use the spider monkey javascript engine with a small example.


I'm trying to call JS_CompileFunction on a buffer containing the js code 
for a function. And then I'm trying to invoke the js function by calling 
JS_CallFunction. I check the "rval" ( value returned from js function ) 
and it is always "void". It should be numeric 10.

What I'm doing wrong?

This is the C code:

#include "jsapi.h"

JSObject *globalObj;

int main( int argc, char * argv[] )
{
     JSRuntime *rt;
     JSContext *cx;

     rt = JS_NewRuntime(0x400000L);
     cx = JS_NewContext(rt, 8192);

     globalObj = JS_NewObject(cx, 0, 0, 0);
     JS_InitStandardClasses(cx, globalObj);

     char *source = "function myfunc() { return ( 10 ) }";
     JSFunction *f = JS_CompileFunction( cx, globalObj, "myfunc", 0, 0, 
source, strlen( source ), "inlined code", lineno );

     ok = JS_CallFunction( cx, globalObj, f, 0, 0, &rval );
     printf( "ok=%d\n", ok );

     if( JSVAL_IS_VOID( rval ) )
       printf( "void...\n" );

     JS_DestroyContext(cx);
     JS_DestroyRuntime(rt);
     JS_ShutDown();
}

Thanks.

.