Returns the string value of a GVariant instance with a string
type. This includes the types G_VARIANT_TYPE_STRING,
G_VARIANT_TYPE_OBJECT_PATH and G_VARIANT_TYPE_SIGNATURE.
The string will always be utf8 encoded.
If length is non-NULL then the length of the string (in bytes) is
returned there. For trusted values, this information is already
known. For untrusted values, a strlen() will be performed.
It is an error to call this function with a value of any type
other than those three.
The return value remains valid as long as value exists.
Since 2.24
Returns the string value of a GVariant instance with a string type. This includes the types G_VARIANT_TYPE_STRING, G_VARIANT_TYPE_OBJECT_PATH and G_VARIANT_TYPE_SIGNATURE. The string will always be utf8 encoded. If length is non-NULL then the length of the string (in bytes) is returned there. For trusted values, this information is already known. For untrusted values, a strlen() will be performed. It is an error to call this function with a value of any type other than those three. The return value remains valid as long as value exists. Since 2.24