import ctypes
import sys
import caio

#================================================================
# Function that checks if a string can be converted to a number
#================================================================
def isnum(str, base):
    try:
        if 10 == base:
            int(str, 10)
        else:
            float(str)
    except:
        return False
    return True

# main

#----------------------------------------
# Declare variables
#----------------------------------------
err_str = ctypes.create_string_buffer(256)      # Error string
lret = ctypes.c_long()                          # Return values of functions
aio_id = ctypes.c_short()                       # ID
device_name = ctypes.create_string_buffer(50)   # Device name
AiData = ctypes.c_float()                       # Converted dat
MaxAiChannels = ctypes.c_short()                # The max number of channels

#----------------------------------------
# Initialize the device
#----------------------------------------
device_name = "AIO000"
AiRange = int(50)  # 0-10V
#----------------------------------------
# Initialization
#----------------------------------------
lret.value = caio.AioInit(device_name.encode(), ctypes.byref(aio_id))
if lret.value != 0:
    caio.AioGetErrorString(lret, err_str)
    print(f"44-AioInit = {lret.value} : {err_str.value.decode('sjis')}")
    sys.exit()
#----------------------------------------
# Reset device
#----------------------------------------
lret.value = caio.AioResetDevice(aio_id)
#print(aio_id)
if lret.value != 0:
    caio.AioGetErrorString(lret, err_str)
    print(f"53-AioResetDevice = {lret.value} : {err_str.value.decode('sjis')}")
    caio.AioExit(aio_id)
    sys.exit()
#----------------------------------------
# Set analog input range
#----------------------------------------
print("\ninput range +/-10V\t\t : 0\t0~10V\t\t : 50")
print("")
#----------------------------------------
# Set the input range
#----------------------------------------
lret.value = caio.AioSetAiRangeAll(aio_id, AiRange)
if lret.value != 0:
    caio.AioGetErrorString(lret, err_str)
    print(f"AioSetAiRangeAll = {lret.value} : {err_str.value.decode('sjis')}")
    caio.AioExit(aio_id)
    sys.exit()
#----------------------------------------
# Set the analog input channel
#----------------------------------------
AiChannel = 0
#----------------------------------------
# Analog input once from the specified channel
#----------------------------------------
lret.value = caio.AioSingleAiEx(aio_id, AiChannel, ctypes.byref(AiData))
if lret.value != 0:
    caio.AioGetErrorString(lret, err_str) 
    print(f"87-AioSingleAiEx = {lret.value} : {err_str.value.decode('sjis')}")
    caio.AioExit(aio_id)
    sys.exit()
print("Channel\t\tVoltage")
print("{0:d}\t\t{1:f}V".format(AiChannel, AiData.value))

AiChannel = 1
#----------------------------------------
# Analog input once from the specified channel
#----------------------------------------
lret.value = caio.AioSingleAiEx(aio_id, AiChannel, ctypes.byref(AiData))
if lret.value != 0:
    caio.AioGetErrorString(lret, err_str) 
    print(f"AioSingleAiEx = {lret.value} : {err_str.value.decode('sjis')}")
    caio.AioExit(aio_id)
    sys.exit()

print("Channel\t\tVoltage")
print("{0:d}\t\t{1:f}V".format(AiChannel, AiData.value))
#----------------------------------------
# Exit the device
#----------------------------------------
lret.value = caio.AioExit(aio_id)
if lret.value != 0:
    caio.AioGetErrorString(lret, err_str)
    print(f"AioExit = {lret.value} : {err_str.value.decode('sjis')}")
    sys.exit()
sys.exit()