gFileEnumeratorNextFilesAsync
Request information for a number of files from the enumerator asynchronously.
When all i/o for the operation is finished the callback will be called with
the requested information. 
gFileEnumeratorNextFilesAsync(object, num.files, io.priority = 0, 
    cancellable = NULL, callback, user.data = NULL)|  | |
|  | the number of file info objects to request | 
|  | the io priority of the request. | 
|  | optional  | 
|  | a  | 
|  | the data to pass to callback function | 
The callback can be called with less than num.files files in case of error
or at the end of the enumerator. In case of a partial error the callback will
be called with any succeeding items and no error, and on the next request the
error will be reported. If a request is cancelled the callback will be called
with G_IO_ERROR_CANCELLED.
During an async request no other sync and async calls are allowed, and will
result in G_IO_ERROR_PENDING errors. 
Any outstanding i/o request with higher priority (lower numerical value) will
be executed before an outstanding request with lower priority. Default
priority is G_PRIORITY_DEFAULT.
Derived by RGtkGen from GTK+ documentation
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