1 CString str; 2     if(GetDlgItemText(IDC_BUTTON1,str),str == "收缩<<") 3     { 4         SetDlgItemText(IDC_BUTTON1,"扩展>>"); 5     } 6     else 7     { 8         SetDlgItemText(IDC_BUTTON1,"收缩<<"); 9     }10     static CRect rectLarge;11     static CRect rectSmall;12     if(rectLarge.IsRectNull())13     {14         CRect rectSeparator;15         GetWindowRect(&rectLarge);16         GetDlgItem(IDC_P)->GetWindowRect(&rectSeparator);17         rectSmall = rectLarge;18 19         rectSmall.bottom = rectSeparator.top;20     }21     if(str == "收缩<<")22     {23         SetWindowPos(NULL,0,0,rectSmall.Width(),rectSmall.Height(),SWP_NOMOVE|SWP_NOZORDER);24     }25     else26     {27         SetWindowPos(NULL,0,0,rectLarge.Width(),rectLarge.Height(),SWP_NOMOVE|SWP_NOZORDER);28     }

其中，IDC_P是pictrue空间的标识、、