c++builder字符串使用

       AnsiString temp = "Update Image process:1%";        AnsiString temp2 = temp.SubString(22,4);            if(temp2[2] == '%')            {                int a = temp2.SubString(1,1).ToInt();                ShowMessage(a);            }            else if(temp2[3] == '%')            {               int a = temp2.SubString(1,2).ToInt();                ShowMessage(a);            }            else if(temp2[4] == '%')            {                int a = 100;                ShowMessage(a);            }            else            {                int a = 0;                ShowMessage(a);            }