Recently, the development platform has been upgraded from VC6.0 to VS2005, and it is necessary to migrate the existing projects. The problems encountered during this process are summarized as follows:
1. **Message Mapping**
VS2005 performs stricter checks on messages. Message mappings that ran perfectly fine under VC6.0 may fail to compile under VS2005.
a. **ON_MESSAGE(message, OnMyMessage)**
The return type of `OnMyMessage` must be `LRESULT`, and its format should be: `afx_msg LRESULT OnMyMessage(WPARAM, LPARAM);`. If this requirement is not met, the following error will occur:
```
error C2440: "static_cast": cannot convert from "void (__thiscall CPppView::* )(void)" to "LRESULT (__thiscall CWnd::* )(WPARAM,LPARAM)"
```
The error indicates that there is no function with the specified name within the scope of the target type.
b. **ON_COMMAND_EX(id, OnMyMessage2)**