windows程式設計筆記

         1.子視窗向父視窗發送訊息時，子視窗向父視窗發送WM_COMMAND訊息。
                  其中LOWORD(wParam)為子視窗ID，HIWORD(wParam)為通知碼，lParam為子視窗控制代碼
         2.id = GetWindowLong(hwndChild,GWL_ID);//擷取ID
            id = GetDlgCtrlID(hwndChild);//同上
            hwnd = GetDlgItem(hwndParent,ID);//擷取控制代碼                  3.SendMessage(hwndButton,BM_SETSTATE,1,0);//類比滑鼠按下按鈕訊息
            SendMessage(hwndButton,BM_SETSTATE,0,0);//使滑鼠恢複正常狀態
         4.WM_KILLFOCUS 訊息的wParam是接受輸入焦點的視窗控制代碼
            WM_SETFOCUS訊息的wParam是即將失去輸入焦點的視窗控制代碼
         通過處理WM_KILLFOCUS訊息可以組織子視窗獲得輸入焦點
            case WM_KILLFOCUS:
                  if(hwnd == GetParent((HWND)wParam))
                        SetFocus(hwnd);
                  return 0;