Error C2440 "static_cast" cannot be from "void (__thiscall c*) (void) ...

1, VC6, said the function can be defined in the header file as:
afx_msg void OnProgress () in this case, but in VS2005 and above, the requirements are strict, the function return value must be the LRESULT type, so in VS2005 and above, it needs to be modified to

LRESULT afx_msg onprogress (WPARAM, LPARAM);

Of these, the following two parameters, regardless of the need to write.

2, add message map no difference

3. The function prototype that I wrote is as follows:

LRESULT cmainframe::onprogress (WPARAM wparam,lparam LPARAM) {return TRUE;//Note to return a true!}

Error C2440 "static_cast" cannot be from "void (__thiscall c*) (void) ...