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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Extension Points: GIO Reference Manual</title>
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<link rel="up" href="extending.html" title="Extending GIO">
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<link rel="prev" href="GIOModule.html" title="GIOModule">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top |
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Description
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Extension Points
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Extension Points — Extension Points
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Functions
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const char *
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g_io_extension_get_name ()
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gint
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g_io_extension_get_priority ()
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GType
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g_io_extension_get_type ()
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GIOExtension *
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g_io_extension_point_get_extension_by_name ()
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GList *
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g_io_extension_point_get_extensions ()
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GType
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g_io_extension_point_get_required_type ()
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GIOExtension *
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g_io_extension_point_implement ()
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GIOExtensionPoint *
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g_io_extension_point_lookup ()
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GIOExtensionPoint *
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g_io_extension_point_register ()
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void
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g_io_extension_point_set_required_type ()
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GTypeClass *
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g_io_extension_ref_class ()
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Types and Values
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GIOExtension
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GIOExtensionPoint
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Includes
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#include <gio.h>
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Description
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GIOExtensionPoint provides a mechanism for modules to extend the
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functionality of the library or application that loaded it in an
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organized fashion.
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An extension point is identified by a name, and it may optionally
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require that any implementation must be of a certain type (or derived
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thereof). Use g_io_extension_point_register() to register an
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extension point, and g_io_extension_point_set_required_type() to
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set a required type.
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A module can implement an extension point by specifying the GType
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that implements the functionality. Additionally, each implementation
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of an extension point has a name, and a priority. Use
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g_io_extension_point_implement() to implement an extension point.
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1
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3
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5
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GIOExtensionPoint *ep;
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ep = g_io_extension_point_register ("my-extension-point");
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g_io_extension_point_set_required_type (ep, MY_TYPE_EXAMPLE);
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1
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2
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3
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5
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6
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G_DEFINE_TYPE (MyExampleImpl, my_example_impl, MY_TYPE_EXAMPLE)
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g_io_extension_point_implement ("my-extension-point",
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my_example_impl_get_type (),
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"my-example",
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10);
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It is up to the code that registered the extension point how
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it uses the implementations that have been associated with it.
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Depending on the use case, it may use all implementations, or
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only the one with the highest priority, or pick a specific
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one by name.
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To avoid opening all modules just to find out what extension
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points they implement, GIO makes use of a caching mechanism,
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see gio-querymodules.
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You are expected to run this command after installing a
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GIO module.
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The GIO_EXTRA_MODULES environment variable can be used to
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specify additional directories to automatically load modules
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from. This environment variable has the same syntax as the
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PATH. If two modules have the same base name in different
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directories, then the latter one will be ignored. If additional
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directories are specified GIO will load modules from the built-in
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directory last.
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Functions
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g_io_extension_get_name ()
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const char *
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g_io_extension_get_name (GIOExtension *extension);
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Gets the name under which extension
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was registered.
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Note that the same type may be registered as extension
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for multiple extension points, under different names.
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Parameters
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extension
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a GIOExtension
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Returns
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the name of extension
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.
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g_io_extension_get_priority ()
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gint
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g_io_extension_get_priority (GIOExtension *extension);
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Gets the priority with which extension
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was registered.
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Parameters
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extension
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a GIOExtension
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Returns
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the priority of extension
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g_io_extension_get_type ()
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GType
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g_io_extension_get_type (GIOExtension *extension);
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Gets the type associated with extension
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.
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Parameters
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extension
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a GIOExtension
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Returns
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the type of extension
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g_io_extension_point_get_extension_by_name ()
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GIOExtension *
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g_io_extension_point_get_extension_by_name
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(GIOExtensionPoint *extension_point,
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const char *name);
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Finds a GIOExtension for an extension point by name.
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Parameters
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extension_point
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a GIOExtensionPoint
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name
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the name of the extension to get
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Returns
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the GIOExtension for extension_point
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that has the
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given name, or NULL if there is no extension with that name.
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[transfer none]
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g_io_extension_point_get_extensions ()
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GList *
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g_io_extension_point_get_extensions (GIOExtensionPoint *extension_point);
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Gets a list of all extensions that implement this extension point.
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The list is sorted by priority, beginning with the highest priority.
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Parameters
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extension_point
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a GIOExtensionPoint
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Returns
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a GList of
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GIOExtensions. The list is owned by GIO and should not be
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modified.
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[element-type GIOExtension][transfer none]
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g_io_extension_point_get_required_type ()
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GType
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g_io_extension_point_get_required_type
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(GIOExtensionPoint *extension_point);
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Gets the required type for extension_point
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.
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Parameters
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extension_point
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a GIOExtensionPoint
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Returns
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the GType that all implementations must have,
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or G_TYPE_INVALID if the extension point has no required type
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g_io_extension_point_implement ()
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GIOExtension *
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g_io_extension_point_implement (const char *extension_point_name,
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GType type,
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const char *extension_name,
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gint priority);
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Registers type
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as extension for the extension point with name
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extension_point_name
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.
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If type
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has already been registered as an extension for this
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extension point, the existing GIOExtension object is returned.
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Parameters
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extension_point_name
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the name of the extension point
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type
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the GType to register as extension
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extension_name
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the name for the extension
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priority
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the priority for the extension
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Returns
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a GIOExtension object for GType.
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[transfer none]
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g_io_extension_point_lookup ()
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GIOExtensionPoint *
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g_io_extension_point_lookup (const char *name);
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Looks up an existing extension point.
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Parameters
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name
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the name of the extension point
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Returns
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the GIOExtensionPoint, or NULL if there
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is no registered extension point with the given name.
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[transfer none]
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g_io_extension_point_register ()
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GIOExtensionPoint *
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g_io_extension_point_register (const char *name);
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Registers an extension point.
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Parameters
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name
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The name of the extension point
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Returns
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the new GIOExtensionPoint. This object is
|
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owned by GIO and should not be freed.
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[transfer none]
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g_io_extension_point_set_required_type ()
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void
|
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g_io_extension_point_set_required_type
|
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(GIOExtensionPoint *extension_point,
|
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GType type);
|
|
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Sets the required type for extension_point
|
|
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to type
|
|
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.
|
|
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All implementations must henceforth have this type.
|
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Parameters
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|
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|
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extension_point
|
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a GIOExtensionPoint
|
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|
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|
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|
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type
|
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the GType to require
|
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g_io_extension_ref_class ()
|
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GTypeClass *
|
|
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g_io_extension_ref_class (GIOExtension *extension);
|
|
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Gets a reference to the class for the type that is
|
|
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associated with extension
|
|
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.
|
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|
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Parameters
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|
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|
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|
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extension
|
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a GIOExtension
|
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|
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|
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|
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Returns
|
|
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the GTypeClass for the type of extension
|
|
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.
|
|
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[transfer full]
|
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|
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Types and Values
|
|
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|
|
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GIOExtension
|
|
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typedef struct _GIOExtension GIOExtension;
|
|
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GIOExtension is an opaque data structure and can only be accessed
|
|
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using the following functions.
|
|
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|
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|
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GIOExtensionPoint
|
|
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typedef struct _GIOExtensionPoint GIOExtensionPoint;
|
|
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GIOExtensionPoint is an opaque data structure and can only be accessed
|
|
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using the following functions.
|
|
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|
|
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|
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|
|
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See Also
|
|
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ae235b |
Extending GIO
|
|
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|
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|
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Generated by GTK-Doc V1.27
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</body>
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</html>
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