windows程序设计笔记

         1.子窗口向父窗口发送消息时，子窗口向父窗口发送WM_COMMAND消息。
                  其中LOWORD(wParam)为子窗口ID，HIWORD(wParam)为通知码，lParam为子窗口句柄
         2.id = GetWindowLong(hwndChild,GWL_ID);//获取ID
            id = GetDlgCtrlID(hwndChild);//同上
            hwnd = GetDlgItem(hwndParent,ID);//获取句柄                  3.SendMessage(hwndButton,BM_SETSTATE,1,0);//模拟鼠标按下按钮消息
            SendMessage(hwndButton,BM_SETSTATE,0,0);//使鼠标恢复正常状态
         4.WM_KILLFOCUS 消息的wParam是接受输入焦点的窗口句柄
            WM_SETFOCUS消息的wParam是即将失去输入焦点的窗口句柄
         通过处理WM_KILLFOCUS消息可以组织子窗口获得输入焦点
            case WM_KILLFOCUS:
                  if(hwnd == GetParent((HWND)wParam))
                        SetFocus(hwnd);
                  return 0;