/// <summary>
/// 打开文件
/// </summary>
/// <param name="strFilePath"></param>
/// <param name="bCacheInMemory"></param>
/// <returns></returns>
public bool Open(string strFilePath, bool bCacheInMemory)
{
if (string.IsNullOrEmpty(strFilePath) == true)
{
return(false);
}
if (File.Exists(strFilePath) == false)
{
return(false);
}
CloseIfOpened();
m_fileStream = File.Open(strFilePath, FileMode.Open, FileAccess.Read);
if (m_fileStream == null || m_fileStream.CanRead == false || m_fileStream.Length > cnMaxFileLength)
{
return(false);
}
Int64 n64FileLength = m_fileStream.Length;
if (n64FileLength > cnMaxFileLength || n64FileLength < 0)
{
return(false);
}
if (bCacheInMemory == true)
{
m_tFileStatue = TBTFileStatus.enCached;
if (n64FileLength > 0)
{
m_CacheByteArray = new Byte[n64FileLength];
m_fileStream.Read(m_CacheByteArray, 0, (Int32)n64FileLength);
}
m_fileStream.Close();
m_fileStream = null;
}
else
{
m_tFileStatue = TBTFileStatus.enOpenHandle;
m_CacheByteArray = null;
}
return(true);
}
/// <summary>
/// 关闭
/// </summary>
/// <returns></returns>
public bool CloseIfOpened()
{
if (m_tFileStatue == TBTFileStatus.enClosed)
{
return(true);
}
if (m_tFileStatue == TBTFileStatus.enOpenHandle && m_fileStream != null)
{
m_tFileStatue = TBTFileStatus.enClosed;
m_fileStream.Close();
return(true);
}
if (m_tFileStatue == TBTFileStatus.enCached)
{
m_tFileStatue = TBTFileStatus.enClosed;
m_CacheByteArray = null;
return(true);
}
return(false);
}
/// <summary>
/// Constructor
/// </summary>
public CBTFileReader()
{
m_tFileStatue = TBTFileStatus.enCached;
}