How Do I Correctly Call A Function That Takes A "custom Enum" As Argument Using Ctypes And Ctypes Based Enums?

I really hope some Python/Ctypes/C expert can help me with this one, it is probably my lack of knowledge on the typing structure to correctly use Ctypes when using Python to intera

Solution 1:

Assuming this implementation, test.cpp:

#include<stdint.h>enumled_property : uint8_t {
    LED_OFF = 0,
    LED_POWER
};

extern"C" __declspec(dllexport) int32_tconfigure_led(enum led_property prop, int32_t value){
    return prop * value;
}

This will allow only LED values for the first parameter:

from ctypes import *
from enum import Enum,auto

classLED(Enum):

    OFF = 0
    POWER = auto()  # autoincrement from last value    @classmethoddeffrom_param(cls,obj):
        ifnotisinstance(obj,LED):
            raise TypeError('not an LED enumeration')
        return c_int8(obj.value)

dll = CDLL('./test')
dll.configure_led.argtypes = LED,c_int32
dll.configure_led.restype = c_int32

print(dll.configure_led(LED.OFF,5))   # prints 0print(dll.configure_led(LED.POWER,5)) # prints 5print(dll.configure_led(0,5))         # not an LED enumeration