Changes from 1.0 to 2.0: GMime 3.0 Reference Manual

## Changes from 1.0 to 2.0 Changes from 1.0 to 2.0 — Incompatible changes made between version 1.0 and version 2.0 |

## Incompatible changes from 1.0 to 2.0

See also the PORTING document in the toplevel GMime source directory.

The major change here is that I've dropped my own base object class and have replaced it with GObject from glib-2.0. This should be a pleasant change since you (the developer) will now be able to do many more things such as setting arbitrary data on all GMime objects. For additional information about GObject, please see the GObject Reference Manual at http://developer.gnome.org/doc/API/2.0/gobject/

- The first thing you need to know is that any function returning a non-const pointer to any object /must/ be unref'd when you are done with it. Since all objects in GMime now subclass GObject, you may safely use `g_object_unref()` (GMimeStream's may also be unref'd using `g_mime_stream_unref()`, but either way is fine). Don't forget that `g_mime_part_get_content_object()` returns a ref-counted GMimeDataWrapper object now, and so you /must/ unref it when you have finished using it. You must also remember to unref any GMimeDataWrapper object that you /set/ on a GMimePart using `g_mime_part_set_content_object()` as the GMimePart will now ref the content object that you set on it.

- GMimeMultipart is a new class which is to be used for all multipart MIME parts rather than GMimePart (as in 1.0). There are also some subclasses of GMimeMultipart for other things.

- `g_mime_part_[g,s]et_boundary()` have been removed (see above). You must now create a GMimeMultipart object and use `g_mime_multipart_[g,s]et_boundary()`.

- `g_mime_part_add_subpart()` has been replaced with `g_mime_multipart_add_part()`.

- `g_mime_part_foreach()` has been replaced with `g_mime_multipart_foreach()` and/or `g_mime_message_foreach_part()`.

- `g_mime_part_get_subpart_from_content_id()` has been replaced with `g_mime_multipart_get_subpart_from_content_id()`.

- Another new class is GMimeMessagePart which is to be used for all MIME parts containing an rfc822 message. All 1.0 GMimePart's representing message/rfc822 parts (as well as message/news parts?) need to be migrated over to be GMimeMessagePart objects.

- GMimeMessagePartial is another class meant for handling the message/partial MIME type. All 1.0 GMimePart's holding data of this type should be replaced with GMimeMessagePartial objects.

- `g_mime_message_write_to_stream()` and `g_mime_part_write_to_stream()` functions have been consolidated into a virtual method. Replace calls to these functions with `g_mime_object_write_to_stream()`. Note: while `g_mime_part_write_to_stream()` and `g_mime_message_write_to_stream()` still exist, it is suggested you migrate to `g_mime_object_write_to_stream()`. Same goes for `g_mime_part_to_string()` and `g_mime_message_to_string()`.

- GMimeMessage's structure has changed a bit. You will not be able to do `message->header`, instead you want to do `((GMimeObject *) message)->header`.

- `g_mime_message_set_message_id()` now takes a message_id argument without the encapsulating < and >'s (it now just takes the addr-spec portion of the msg-id).

- GMimeFilterFrom has changed slightly, you will want to replace all calls to `g_mime_filter_from_new()` with `g_mime_filter_from_new (GMIME_FILTER_FROM_MODE_DEFAULT)` (`GMIME_FILTER_FROM_MODE_DEFAULT` is equivalent to (int) 0).

- GMimeParser is a brand new class and `gmime-parser.h` has had a number of API additions. `g_mime_parser_construct_part()` and `g_mime_parser_construct_message()` still exist, however they no longer take a GMimeStream argument. Instead, they take a GMimeParser object.