Starts an asynchronous load of the file's contents.
For more details, see g_file_load_contents() which is
the synchronous version of this call.
When the load operation has completed, callback will be called
with user data. To finish the operation, call
g_file_load_contents_finish() with the GAsyncResult returned by
the callback.
If cancellable 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.
Starts an asynchronous load of the file's contents. For more details, see g_file_load_contents() which is the synchronous version of this call. When the load operation has completed, callback will be called with user data. To finish the operation, call g_file_load_contents_finish() with the GAsyncResult returned by the callback. If cancellable 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.