CString str;
  if(GetDlgItemText((IDC_BUTTON1),str),str=="收缩>>")  
  {
      
      SetDlgItemText(IDC_BUTTON1,"扩展>>");}
  else
  {
    SetDlgItemText(IDC_BUTTON1,"收缩>>");
  
  }

[color=FF00FF]    static CRect rectLarge;
    static CRect recta;[/color]
     
    if(rectLarge.IsRectNull())
    {
[color=FF0000]    static CRect rectSmall;        //这句可以放进IF这里
    
    //static CRect rectLarge;把这两句移到这里会编译错误为什么
    //static CRect recta;[/color]
    CRect rectSeparator;
    GetWindowRect(&rectLarge);
    
    GetWindowRect(&recta);
    GetDlgItem(IDC_SEPARATOR)->GetWindowRect(rectSeparator);

    recta.left=rectLarge.left;
        recta.top=rectLarge.top;
        recta.right=rectLarge.right;
        recta.bottom=rectSeparator.bottom;
        
    }
    if(str=="扩展>>")
    {
    SetWindowPos(NULL,0,0,recta.Width(),recta.Height(),SWP_NOMOVE|SWP_NOZORDER);
    }
    else
    {
    SetWindowPos(NULL,0,0,rectLarge.Width(),rectLarge.Height(),SWP_NOMOVE|SWP_NOZORDER);
    }