How to work with CefCookieManager?

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Chromium-embedded

Had anybody worked with CEF3 CefCookieManager?

I just want to study the usage of CefCookieManager,so I test my code in cefSimple project packed wtih Cef3 downloads.I use cef3.1750,vs2013(vc12)
First,I write a class(WXRequestContextHandler) which inherited form CefRequestContextHandler,like this:

#include "include/cef_app.h"
#include "include/cef_request_context_handler.h"
#include "include/cef_cookie.h"

class WXRequestContextHandler :public CefRequestContextHandler
{
public:
	WXRequestContextHandler(){};
	~WXRequestContextHandler(){};
	CefRefPtr<CefCookieManager> GetCookieManager() OVERRIDE{
			
		return CefCookieManager::CreateManager("F:\\CefCookie",FALSE);
	}
private:
	// Include the default reference counting implementation.
	IMPLEMENT_REFCOUNTING(WXRequestContextHandler);
};

then Create an instance of this Class,like this:

CefRefPtr<CefRequestContext> rc = CefRequestContext::CreateContext(new WXRequestContextHandler());

and Create the browser:

CefBrowserHost::CreateBrowser(window_info, handler.get(), url,
                                browser_settings, rc);

OK,I don't know anymore about the CefCookieManager,so I run the code press F5,and got a exception(triggered in libcef.dll ,access violation 0xc0000005),the cefSimple application crashed.
I noticted the getCookieManager methed was called and when it return the exception will be triggered.but if it return NULL(which means use global cookieManager) the app runs as normal.
Obviously,I think I didn't use the CookieManager::CreateManager Correctly.
My problem is:what is the correct way to use CefCookieManager::CreateManager?