crash on mouse wheel

[nickak2003]

I try to send mouse wheel event, this code used to work, I think. It results in a exception at send_mouse_wheel_event.
I am doing windowless mode.

Code: Select all

   CefMouseEvent mouse_event;
   mouse_event.x = evt.x;
   mouse_event.y = evt.y;
   mouse_event.modifiers = mCurrentKeyModifiers;

   mBrowser->GetHost()->SendMouseWheelEvent(mouse_event, evt.x, evt.y);

breakpoint in here:

Code: Select all

void CefBrowserHostCToCpp::SendMouseWheelEvent(const CefMouseEvent& event,
                                               int deltaX,
                                               int deltaY) {
  shutdown_checker::AssertNotShutdown();

  cef_browser_host_t* _struct = GetStruct();
  if (CEF_MEMBER_MISSING(_struct, send_mouse_wheel_event))
    return;

  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING

  // Execute
  _struct->send_mouse_wheel_event(_struct, &event, deltaX, deltaY);
}

[magreenblatt]

What OS and CEF version? Does the problem reproduce with the cefclient sample application?

[amaitland]

You appear to be sending x and y values rather than the delta.

https://github.com/chromiumembedded/cef ... in.cc#L747

From memory delta is in I increments of 120(plus or minus depending on direction).

[nickak2003]

So, I am using windows 10, latest cef3.

So I have experimented with it some:

deltaX and deltaY is a combination of zero and one, or two ones: results in exception.
deltaX and deltaY is a combination of at least one non-one: results in no exception.

1, 1: exception
1, 120 : no exception
1, 0 : exception
0,0 : no exception
0, 120 : no exception

*does not need to be 120, can be 2

[magreenblatt]

If you download symbols you can get a useful stack trace. Also, check the debug log for error messages.

[wpp]

I also had the same problem, the picture is an error message: