qt怎样将字符串转化为16进制？

char ConvertHexChar(char ch){if((ch >= '0') && (ch = 'A') && (ch = 'a') && (ch = len)break;lstr = str[i].toLatin1();hexdata = ConvertHexChar(hstr);lowhexdata = ConvertHexChar(lstr);if((hexdata == 16) || (lowhexdata == 16))break;