oc版本，解到乱码，jceinputStream里会进断言

[liaogang]

在jceinputStream.m里的, 各种断言，建议改成抛错处理,至少程序不会崩溃

• (NSNumber *)readNumber:(int)tag required:(BOOL)required
  {
  [self peakHead];
  if (_headTag != tag)
  {
  assert(required == NO);
  return nil;
  }
  else
  {
  [self readHead];
  switch (_headType)
  {
  case TARS_TYPE_ZERO:
  return [NSNumber numberWithChar:0];
  case TARS_TYPE_INT1:
  return [NSNumber numberWithChar:[self readInt1]];
  case TARS_TYPE_INT2:
  return [NSNumber numberWithShort:[self readInt2]];
  case TARS_TYPE_INT4:
  return [NSNumber numberWithInt:[self readInt4]];
  case TARS_TYPE_INT8:
  return [NSNumber numberWithLongLong:[self readInt8]];
  case TARS_TYPE_FLOAT:
  return [NSNumber numberWithFloat:[self readFloat]];
  case TARS_TYPE_DOUBLE:
  return [NSNumber numberWithDouble:[self readDouble]];
  default:
  assert(0);
  break;
  }
  }
  }