m_i_streambuf->SetBufferIO((char*) data, (char*) (data+len));
m_i_streambuf->SetIntPosition(0); // seek to start pos
m_i_streambuf->Fixed(TRUE);
m_i_streambuf->SetBufferIO((char*) data, (char*) (data+len));
m_i_streambuf->SetIntPosition(0); // seek to start pos
m_i_streambuf->Fixed(TRUE);