Gio.InputStream.prototype.read_bytes_async

function read_bytes_async(count: Number(gsize), io_priority: Number(gint), cancellable: Gio.Cancellable, callback: Gio.AsyncReadyCallback): void {
    // Gjs wrapper for g_input_stream_read_bytes_async()
}
  

Request an asynchronous read of count bytes from the stream into a new GLib.Bytes. When the operation is finished callback will be called. You can then call Gio.InputStream.prototype.read_bytes_finish to get the result of the operation.

During an async request no other sync and async calls are allowed on stream, and will result in Gio.IOErrorEnum.pending errors.

A value of count larger than %G_MAXSSIZE will cause a Gio.IOErrorEnum.invalid_argument error.

On success, the new GLib.Bytes will be passed to the callback. It is not an error if this is smaller than the requested size, as it can happen e.g. near the end of a file, but generally we try to read as many bytes as requested. Zero is returned on end of file (or if count is zero), but never otherwise.

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.