CODEWITHSUNDEEP
pythoncdllctypes
user6730734
user6730734

Reputation: 25

ctypes c_char_p as an input to a function in python

I am writing a C DLL and a python script for it as below:

//test.c
__declspec(dllexport) HRESULT datafromfile(char * filename)
{
  HRESULT errorCode = S_FALSE;

    if (pFileName == NULL)
    {
        return E_INVALIDARG;
    }

    FILE *fp = NULL;
    fopen_s(&fp, pFileName, "rb");

    if (fp == NULL)
        return E_FAIL;

some more lines of code are there....

The python script that i had written is as follows:

//test.py
import sys
import ctypes
from ctypes import *

def datafromfile(self,FileName):
    self.mydll=CDLL('test.dll')
    self.mydll.datafromfile.argtypes = [c_char_p]
    self.mydll.datafromfile.restypes = HRESULT
    self.mydll.datafromfile(FileName)

While calling in the main I'm assigning the filename as:

FileName = 'abcd.EDID'
datafromfile(FileName)

But the code is giving an error, Windows Error: Unspecified Error. Can anybody help me in how to pass the c_char_p to the function as shown above?

Upvotes: 1

Views: 144

Answers (1)

user6730734
user6730734

Reputation: 25

A very silly mistake I was doing, I had kept the edid file in some other folder and was running the script from other. Instead of giving only the filename, I gave the relative path.

Upvotes: 1

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