length.gFileLoadContents(object, cancellable = NULL, .errwarn = TRUE)objectGFile.cancellableGCancellable object, NULL to ignore.TRUE if the file's contents were successfully loaded.
FALSE if there were errors.contentslengthNULL if the length is not neededetag.outNULL if the entity tag is not needederrorGError, or NULLcancellable is not NULL, then the operation can be cancelled by
triggering the cancellable object from another thread. If the operation
was cancelled, the error G_IO_ERROR_CANCELLED will be returned.