GVariant : GLib Reference Manual – GNOME, GVariant Format Strings: GLib Reference Manual, GVariant : GLib Reference Manual – GNOME, GVariant : GLib Reference Manual – GNOME, GVariant uses an internal buffer management structure to deal with the various different possible sources of serialised data that it uses. The buffer is responsible for ensuring that the correct call is made when the data is no longer in use by GVariant. This may involve a g_free () or a g_slice_free () or even g_mapped_file_unref ().
The string is collected and duplicated normally. For g_variant_get() it means that instead of creating a newly allocated copy of the string, a pointer to the serialised data is returned. This pointer should not be freed. Validity checks are performed to ensure that the string data will always be properly nul-terminated.
GVariant is heavily optimised for dealing with data in serialised form. It works particularly well with data located in memory-mapped files. It can perform nearly all deserialisation operations in a small constant time, usually touching only a single memory page. Serialised GVariant .
GVariant uses an internal buffer management structure to deal with the various different possible sources of serialised data that it uses. The buffer is responsible for ensuring that the correct call is made when the data is no longer in use by GVariant. This may involve a g_free () or a g_slice_free () or even g_mapped_file_unref ().
* @data: (nullable): the serialised data of this value, or %NULL * @size: the size of this value * * A structure representing a GVariant in serialised form. This * structure is used with #GVariantSerialisedFiller functions and as the * primary interface to the serialiser. See #GVariantSerialisedFiller * for a description of its use there. *, A pure-rust implementation of the GVariant serialisation format intended for fast reading of in-memory buffers. let data = copy_to_align ( bx22x00x00x00William ) let ( age , name ) = gv ! ( (is) ). cast ( data . as_ref ()). into () assert_eq !, * #GVariant is heavily optimised for dealing with data in serialised * form. It works particularly well with data located in memory-mapped * files. It can perform nearly all deserialisation operations in a * small constant time, usually touching only a single memory page. * Serialised #GVariant data can also be sent over the network. *, Conversions occur according to format strings. A format string is a two-way mapping between a single GVariant value and one or more C values. A conversion from C values into a GVariant value is made using the g _variant_new() function. A conversion from a GVariant into C values is made using the g _variant_get() function.
Provided only for completeness so that all GVariant type strings can be used also as format strings. See GVariant * below. & Used as a prefix for a GVariant type string (not a prefix for a format string, so &s is a valid format string but &@s is not). Denotes that a C pointer to serialised data should be used in place of the normal C type.
Ensure that the glib2-fam package is installed on the system. To verify whether the package is installed on the system: ~]# yum list installed … Note that the value is specified as a serialised GVariant . Example 6.2. Adding selected applications into the favorite applications key.
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