[webkit-dev] JavaScriptCor API use

Darin Adler darin at apple.com
Tue May 26 08:56:35 PDT 2009

On May 26, 2009, at 8:32 AM, Jack Wootton wrote:

> 1. I'm attempting to use the JavaScriptCore API to add new JSObjects
> to the JavaScript environment.  In order to use the API I include
> "JavaScriptCore.h".  However in doing so, JSStringRefCF.h contains
> errors.  The system include CoreFoundation/CoreFoundation.h cannot be
> opened.  Has anyone had this problem before?

The JavaScriptCore.h header is a Mac OS X Framework header, and  
intended for use only on Mac OS X.

On other platforms it shouldn't even be installed. You can include the  
individual header, or if you want a similar "includes it all" header  
on some other platform or for cross-platform code, use JavaScript.h.

> 2. After a JSObject has been successfully created using the  
> JavaScriptCore API, is it correct to use the following method to add  
> it to the JavaScript environment:
> void Window::put(ExecState* exec, const Identifier& propertyName,  
> JSValue* value, int attr)

No. That is only for internal use within WebCore. You’ll need to get a  
JSObjectRef for the window object. How you do that depends on the  
platform you're on. Since you don't say what platform you're working  
on I can't tell you how to do it. On Mac OS X you would implement the  
frame load delegate webView:windowScriptObjectAvailable: method and  
then call the JSObjectRef method on the Objective-C object from that  

     -- Darin

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