Pixbuf.getFileInfoAsync

void getFileInfoAsync(string filename,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

Asynchronously parses an image file far enough to determine its format and size.

For more details see gdkpixbuf.pixbuf.Pixbuf.getFileInfo, which is the synchronous version of this function.

When the operation is finished, callback will be called in the main thread. You can then call gdkpixbuf.pixbuf.Pixbuf.getFileInfoFinish to get the result of the operation.

Parameters

`filename`	The name of the file to identify
`cancellable`	optional gio.cancellable.Cancellable object, `NULL` to ignore
`callback`	a gio.types.AsyncReadyCallback to call when the file info is available