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Getting return value from Javascript in WebKit / JavaScriptCore

I am using the JavaScriptCore API to get the global context for Javascript. I would like to be able to manipulate the value that I get from Javascript in C. Here is an example of the code that I have that matters:

JSGlobalContextRef jsContext = webkit_web_frame_get_global_context(webkit_web_view_get_main_frame(webView));

JSStringRef script = JSStringCreateWithUTF8CString("ReturnOne()");

JSValueRef val = JSEvaluateScript(jsContext, script, NULL, NULL, 0, NULL);

return JSValueToNumber(jsContext, val, NULL);

The ReturnOne () function is a JavaScript function that looks like this:

function ReturnOne() {
  return 1;
}

When I put a warning in a function, it displays, so I know that the function is being called correctly. I try to just print number 1, but instead get a large negative value. Am I misinterpreting JSValueToNumber?

Any advice would be appreciated. Thank.

EDIT: I did some operations and found this stone - https://lists.webkit.org/pipermail/webkit-help/2011-January/001849.html

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JSStringRef script = JSStringCreateWithUTF8CString("ReturnOne();");
JSValueRef val = JSEvaluateScript(jsContext, script, NULL, NULL, 0, NULL);
return (int)JSValueToNumber(jsContext, val, NULL);
0

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