Cannot be converted from "void (_ thiscall ctestdlg: *) (void)" to "lresult (_ thiscall cwnd: *) (wparam, lparam )"

When adding custom messages according to Sun Xin's tutorial, if it is a vc6.0 development environment, there may be nothing

But an error will be reported during compilation in vs2008.

Cannot be converted from "void (_ thiscall ctestdlg: *) (void)" to "lresult (_ thiscall cwnd: *) (wparam, lparam )"

This is because in vs2008, the message return value cannot be void, and the message parameter cannot be blank. The message ing fields are as follows:

# Define um_mymessage (wm_user + 1)

Afx_msgLresultOnmymessage (Wparam, lparam);

On_message (um_mymessage, onmymessage)

LresultCtestdlg: onmymessage (Wparam, lparam)
{
Return 1;
}

Note: In vc6.0, The lresult can be void, and the wparam and lparam parameters can be left empty,

But it must be written in vs2008 as above. Even if you do not use the wparam or lparam parameters, no return value is returned.