private void SaveWordItem(BinaryWriter writer, WordItem item)
{
int frequency = item.nFrequency;
int wordLength = item.nWordLen;
int handle = item.nPOS;
writer.Write(frequency);
writer.Write(wordLength);
writer.Write(handle);
if (wordLength > 0)
writer.Write(Encoding.GetEncoding("gb2312").GetBytes(item.sWord));
}