鼠标滚轮消息的响应问题
问题描述:
建立一个窗口,代码如下:
//////////////////////////code
m_pSecondWnd = new CWnd;
m_pSecondWnd->Create(m_lpszSecondClassName, NULL,WS_CHILD | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL,
CRect(0,0,0,0),this, 1005);
OldProc = (WNDPROC)::GetWindowLong(m_pSecondWnd->m_hWnd, GWL_WNDPROC);
::SetWindowLong(m_pSecondWnd->m_hWnd, GWL_WNDPROC, (long)ScrollProc);
//////////////////////////code ends
为什么在ScrollProc里不能响应WM_MOUSEWHEEL消息?