Question about CefStringVisitor

[silver]

My application is crashing and the scenario is like this.

I create an instance of CefStringVisitor like this, which also gets a pointer to the class object.

Code: Select all

GetMainFrame()->GetSource( new MyCefStringVisitor( this ));


The Visit function of MyCefStringVisitor uses "this" to call a function.
Now if I close the application in between, there is a crash, because the "this" object goes out of scope before MyCefStringVisitor::Visit is done.

How do I fix this ? What am I doing wrong ?

In the destructor of the "this" object I am calling CloseBrowser(true).
Is there a way to stop all CefStringVisitor activity before calling CloseBrowser ?

[magreenblatt]

The object type represented by |this| should be refcounted, or you should use WeakPtrFactory. See include/base/cef_ref_counted.h and include/base/cef_weak_ptr.h. Example usage exists in cefclient.

[silver]

The object type represented by |this| should be refcounted, or you should use WeakPtrFactory. See include/base/cef_ref_counted.h and include/base/cef_weak_ptr.h. Example usage exists in cefclient.

"this" is an object of type wxFrame ( a window frame ) whose scope is controlled by the wxWidgets library internally.
Once I press the close button, wxWidgets will delete it.

How do I then implement ref counting ?

[magreenblatt]

"this" is an object of type wxFrame ( a window frame ) whose scope is controlled by the wxWidgets library internally.
Once I press the close button, wxWidgets will delete it.

In this case you should use WeakPtrFactory which will invalidate the WeakPtr when the wxWidgets object is deleted. What thread does the wxWidgets object live on? Since WeakPtr is not thread safe you will need to post it and the associated data to the correct thread (the thread that the wxWidgets object lives on) before dereferencing it.

[silver]

In this case you should use WeakPtrFactory which will invalidate the WeakPtr when the wxWidgets object is deleted. What thread does the wxWidgets object live on? Since WeakPtr is not thread safe you will need to post it and the associated data to the correct thread (the thread that the wxWidgets object lives on) before dereferencing it.

1. The wxWidgets object are created on the one and only main thread.
2. How exactly do I use WeakPtr (need some code example).

Even if I were to wrap the wxWidget object in some kind of a smart pointer, wxWidgets will delete the object while the other thread is running some function on it.

[magreenblatt]

Here is an example of using WeakPtrFactory: https://www.chromium.org/developers/des ... ncellation