Compile Error(C2440)Using CEFbrowser & VS2015

问题

there. I'm new to CEFbrowser. I'm developing the download model of My CefBrowser. I've written some code but error while compiling.

 class CefClient : public virtual CefBase {
 public:
  ///
  // Return the handler for download events. If no handler is returned downloads
  // will not be allowed.
  ///
  /*--cef()--*/
  virtual CefRefPtr<CefDownloadHandler> GetDownloadHandler(){
     return this;
  }

But VS2015 says C2440:

"return":cannot convert from 'CefClient *const' to 'CefRefPtr<CefDownloadHandler>'

I'm new. and when i change return this to return null it runs, but can't download. What can i do to solve this problem? Thank you!

回答1:

It looks like your CefClient has to inherit from CefDownloadHandler, i.e. class CefClient: public virtual CefBase, public CefDownloadHandler: CEF C++ Implementing download handler

Once you inherit from CefDownloadHandler, returning this from an instance of CefClient will fit correctly as a CefRefPtr<CefDownloadHandler>.

来源：https://stackoverflow.com/questions/62912066/compile-errorc2440using-cefbrowser-vs2015