an URI scheme, e.g. "http"
a #GVfsFileLookupFunc
custom data passed to be passed to @uri_func, or %NULL
function to be called when unregistering the URI scheme, or when @vfs is disposed, to free the resources used by the URI lookup function
a #GVfsFileLookupFunc
custom data passed to be passed to @parse_name_func, or %NULL
function to be called when unregistering the URI scheme, or when @vfs is disposed, to free the resources used by the parse name lookup function
%TRUE if @scheme was successfully registered, or %FALSE if a handler for @scheme already exists.
2.50
Registers @uri_func and @parse_name_func as the #GFile URI and parse name lookup functions for URIs with a scheme matching @scheme. Note that @scheme is registered only within the running application, as opposed to desktop-wide as it happens with GVfs backends.
When a #GFile is requested with an URI containing @scheme (e.g. through g_file_new_for_uri()), @uri_func will be called to allow a custom constructor. The implementation of @uri_func should not be blocking, and must not call g_vfs_register_uri_scheme() or g_vfs_unregister_uri_scheme().
When g_file_parse_name() is called with a parse name obtained from such file, @parse_name_func will be called to allow the #GFile to be created again. In that case, it's responsibility of @parse_name_func to make sure the parse name matches what the custom #GFile implementation returned when g_file_get_parse_name() was previously called. The implementation of @parse_name_func should not be blocking, and must not call g_vfs_register_uri_scheme() or g_vfs_unregister_uri_scheme().
It's an error to call this function twice with the same scheme. To unregister a custom URI scheme, use g_vfs_unregister_uri_scheme().