char ch_ReadByte='H';
char *ptr_OneLineData;
unsigned );

    if ((ptr_OneLineData = (char *)malloc(bufsize)) == NULL)
    {
        AfxMessageBox(_T("内存申请失败！"));
    }
    else
    {
        memset(ptr_OneLineData, , bufsize);//成功申请后一定要重新填充0值到内存中

        ptr_OneLineData[chNum] = ch_ReadByte;//使用下标访问

        free(ptr_OneLineData);//用完后要free
    }