CODEWITHSUNDEEP
pythonc
user974168
user974168

Reputation: 237

passing a pointer value to a C function from python

I have a C function which takes a int and returns by filling up the value in b

typedef   uint8_t State;
#define   STATE_POWERDOWN               ((State) 0x00) 
#define   STATE_SLEEP                   ((State) 0x10) 


int Val_GetStatus(int a , State *b)

This function alongwith others has been exported from a C DLL.

I call this function from python. While I am able to connect with the DLL I don't understand how to pass a variable to this function in python ?

def Acme_getDeviceStatus(self,DeviceStatus):
    # b 
    self.device.Val_GetStatus(0,b)  # how to pass and get value in b
    # DeviceStatus = b
    # return DeviceStatus somehow

Upvotes: 1

Views: 3221

Answers (1)

wenzul
wenzul

Reputation: 4058

You can use for example ctypes or swig to call C functions in Python.

from ctypes import *

Val_GetStatus= CDLL('x').Val_GetStatus
Val_GetStatus.argtypes = [c_int,POINTER(c_unit8)]
Val_GetStatus.restype = c_int

deviceStatus = ctypes.c_uint8()

print Val_GetStatus(0, byref(deviceStatus))
print deviceStatus.value

Swig will generate kind of interface for you, so you don't have to do it manually.

Upvotes: 6

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