a #GAsyncResult
a location to place the contents of the file
a location to place the current entity tag for the file, or null if the entity tag is not needed
true if the load was successful. If false and error is present, it will be set appropriately.
Finishes an asynchronous partial load operation that was started with gio.file.File.loadPartialContentsAsync. The data is always zero-terminated, but this is not included in the resultant length. The returned contents should be freed with glib.global.gfree when no longer needed.