# Gst::Message Class Reference

Gst::Message - Lightweight objects to signal the application of pipeline events. More...

`#include <message.h>`

Inheritance diagram for Gst::Message:

List of all members.

## Public Member Functions

virtual | ~Message ()
GstMessage* | gobj ()
| Provides access to the underlying C GstMiniObject.
const GstMessage* | gobj () const
| Provides access to the underlying C GstMiniObject.
GstMessage* | gobj_copy ()
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
Glib::RefPtr<Gst::Message> | copy () const
| Creates a copy of the message.
const Gst::Structure | get_structure () const
| Access the structure of the message.
Glib::RefPtr<Gst::Message> | create_writable ()
| Checks if a message is writable.
MessageType | get_message_type () const
| Get the GstMessageType of message.
ClockTime | get_timestamp () const
| Get the timestamp of message.
Glib::RefPtr<Gst::Object> | get_source ()
| Get the object that posted the message.
Glib::RefPtr<const Gst::Object> | get_source () const

## Static Public Member Functions

static Glib::RefPtr<Gst::Message> | wrap (GstMessage* message, bool take_copy=false)
| Wrap a GstMessage* in a C++ instance, creating an instance of a derived Gst::Message.

## Detailed Description

Gst::Message - Lightweight objects to signal the application of pipeline events.

Messages are implemented as a subclass of Gst::MiniObject with a generic Gst::Structure as the content. This allows for writing custom messages without requiring an API change while allowing a wide range of different types of messages.

Messages are posted by objects in the pipeline and are passed to the application using the Gst::Bus.

The basic use pattern of posting a message on a Gst::Bus is as follows:

     bus->post(Gst::MessageEos::create(my_element));

## Constructor & Destructor Documentation

virtual Gst::Message::~Message | ( |  | ) | `[virtual]`

## Member Function Documentation

GstMessage* Gst::Message::gobj | ( |  | ) | `[inline]`

Provides access to the underlying C GstMiniObject.

Reimplemented from Gst::MiniObject.

const GstMessage* Gst::Message::gobj | ( |  | ) | const`[inline]`

Provides access to the underlying C GstMiniObject.

Reimplemented from Gst::MiniObject.

GstMessage* Gst::Message::gobj_copy | ( |  | ) |

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

Glib::RefPtr<Gst::Message> wrap | ( | GstMessage * | message,
|  | bool | take_copy = `false` |
| ) |  |  | `[static]`

Wrap a GstMessage* in a C++ instance, creating an instance of a derived Gst::Message.

Gst::wrap() would just create a Gst::Message (rather than a derived one) because the derived Gst::Message classes do not correspond to GType types in the GStreamer API.

Parameters:

  | object | The C instance
  | take_copy | false if the result should take ownership of the C instance. true if it should take a new copy or ref.

Returns:
  A C++ instance that wraps this C instance.

Glib::RefPtr<Gst::Message> Gst::Message::copy | ( |  | ) | const

Creates a copy of the message.

MT safe.

Returns:
  A copy of the message.

Reimplemented from Gst::MiniObject.

const Gst::Structure Gst::Message::get_structure | ( |  | ) | const

Access the structure of the message.

Returns:
  The structure of the message. The structure is still owned by the message, which means that you should not free it and that the pointer becomes invalid when you free the message.

MT safe.

Glib::RefPtr<Gst::Message> Gst::Message::create_writable | ( |  | ) |

Checks if a message is writable.

If not, a writable copy is made and returned.

Returns:
  A Gst::Message (possibly the same pointer) that is writable.

Reimplemented from Gst::MiniObject.

MessageType Gst::Message::get_message_type | ( |  | ) | const

Get the GstMessageType of message.

ClockTime Gst::Message::get_timestamp | ( |  | ) | const

Get the timestamp of message.

This is the timestamp when the message was created.

Glib::RefPtr<Gst::Object> Gst::Message::get_source | ( |  | ) |

Get the object that posted the message.

Glib::RefPtr<const Gst::Object> Gst::Message::get_source | ( |  | ) | const

The documentation for this class was generated from the following file:

- message.h