gio.MemoryOutputStream Streaming output operations on memory chunks gio.MemoryOutputStream gio.OutputStream gio.MemoryOutputStream get_contents get_data_size get_size +-- gobject.GObject +-- gio.OutputStream +-- gio.MemoryOutputStream gio.MemoryOutputStream implements gio.Seekable gio.MemoryOutputStream is a class for using arbitrary memory chunks as output for GIO streaming output operations. gio.MemoryOutputStream Returns : a new gio.MemoryOutputStream. Creates a new gio.MemoryOutputStream. get_contents Returns : the stream's data The get_contents() method gets any loaded data from the ostream. Note that the returned data may become invalid on the next write or truncate operation on the stream. get_data_size Returns : the number of bytes written to the stream The get_data_size() method returns the number of bytes from the start up to including the last byte written in the stream that has not been truncated away. get_size Returns : the number of bytes allocated for the data buffer The get_size() method gets the size of the currently allocated data area (availible from gio.MemoryOutputStream.get_contents() ). Note that for growable streams the returned size may become invalid on the next write or truncate operation on the stream. If you want the number of bytes currently written to the stream, use gio.MemoryOutputStream.get_data_size().