急救!!!大虾请进!!!

从固件文件down到--->DRAM:


using std::ifstream;
ifstream in(\"firmware.hex\");
assure(in, \"firmware.hex\");

while (in.read(&buf, 1))
{
   if (!isalnum(buf)) continue;//该句出错.

   if (buf == 0xa || buf == 0xd)
continue;
...........
.........

PS:
firmware.hex ------固件文件.

可不可以说清除点呀。