USB-I/O Interface Adapter GPIO-24. Programmer's Reference Manual.
2.1.5. GPIO_CloseDevice()
GPIO_RESULT GPIO_CloseAllDevices();
The GPIO_CloseAllDevices() function closes all devices, currently opened by the application.
Return values:
- GPIO_S_SUCCESS
All devices were successfully closed.
- GPIO_E_FAIL
Failed to close one or more devices.
- GPIO_E_NOT_INITIALIZED
Library has not been initialized.
