cef OnBeforeResourceLoad

xxx.h
#pragma once
 #include <cef\include\cef_app.h>
 #include <cef\include\cef_client.h>
 #include <cef\include\cef_command_line.h>
 #include <cef\include\cef_load_handler.h>
 #include <cef\include\cef_browser_process_handler.h>
 #include <cef\include\cef_request_handler.h>
 #include <cef\include\cef_resource_request_handler.h>class CCefHandlerImpl:
     public CefApp,
     public CefClient,
     public CefDisplayHandler,
     public CefLifeSpanHandler,
     public CefLoadHandler,
     public CefBrowserProcessHandler,
     public CefRequestHandler,
     public CefResourceRequestHandler
 {  // CefResourceRequestHandler methods
     virtual CefResourceRequestHandler::ReturnValue OnBeforeResourceLoad(
         CefRefPtr<CefBrowser> browser,
         CefRefPtr<CefFrame> frame,
         CefRefPtr<CefRequest> request,
         CefRefPtr<CefRequestCallback> callback) override;// CefClient methods: 下面这行很重要，不能少
virtual CefRefPtr<CefRequestHandler> GetRequestHandler() OVERRIDE { return this; }
}
--------------------------------------
xxxx.cpp
CefResourceRequestHandler::ReturnValue CCefHandlerImpl::OnBeforeResourceLoad(CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame, CefRefPtr<CefRequest> request, CefRefPtr<CefRequestCallback> callback)
 {
     OutputDebugStringA("CCefHandlerImpl::OnBeforeResourceLoad \n");
     OutputDebugString(frame->GetURL().c_str());
     //AfxMessageBox(frame->GetURL().c_str());
     return RV_CONTINUE;
 }