Reads an unsigned 64-bit/8-byte value from stream.
In order to get the correct byte order for this read operation, see gio.data_input_stream.DataInputStream.getByteOrder.
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 gio.types.IOErrorEnum.Cancelled will be returned.
optional #GCancellable object, null to ignore.
an unsigned 64-bit/8-byte read from stream or 0 if an error occurred.
Reads an unsigned 64-bit/8-byte value from stream.
In order to get the correct byte order for this read operation, see gio.data_input_stream.DataInputStream.getByteOrder.
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 gio.types.IOErrorEnum.Cancelled will be returned.