C++ code:

	// Toggle LED (cmd 0x80). The first byte is the report number (0x1).
	buf[0] = 0x1;
	buf[1] = 0x80;
	res = hid_write(handle, buf, 17);
	if (res < 0) {
		printf("Unable to write(): %ls\n", hid_error(handle));
	}


	// Request state (cmd 0x81). The first byte is the report number (0x1).
	buf[0] = 0x1;
	buf[1] = 0x81;
	hid_write(handle, buf, 17);
	if (res < 0) {
		printf("Unable to write()/2: %ls\n", hid_error(handle));
	}

	// This loop demonstrates the non-blocking nature of hid_read().
	res = 0;
	i = 0;
	while (res == 0) {
		res = hid_read(handle, buf, sizeof(buf));
	....
       }