m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
m_i_streambuf->SetBufferIO((void *)data, len); // const_cast
m_i_streambuf->SetIntPosition(0); // seek to start pos
m_i_streambuf = new wxStreamBuffer(wxStreamBuffer::read);
m_i_streambuf->SetBufferIO((void *)data, len); // const_cast
m_i_streambuf->SetIntPosition(0); // seek to start pos