Gio.File.prototype.read_async

function read_async(io_priority: Number(gint), cancellable: Gio.Cancellable, callback: Gio.AsyncReadyCallback): void {
    // Gjs wrapper for g_file_read_async()
}
  

Asynchronously opens file for reading.

For more details, see Gio.File.prototype.read which is the synchronous version of this call.

When the operation is finished, callback will be called. You can then call Gio.File.prototype.read_finish to get the result of the operation.