I’m converting a C code into a Python code that uses a .dll file. The syntax for accessing the commands from the DLL is given below: C code Pointer to the odbm data structure is as follows: C code used to access the dll command: The python code that I converted according to the above C code is as follows:
Tag: ctypes
SendMessage only send the *first* character of the string
I am using the following python code to send String to a RAD Studio C++ Builder built application: It is perfectly find the opponent application and SendMessage sends data. My problem: It only sends the 1st character of the string. So instead of: “This is a message to signal…” , it only sends “T”. I am sure that I am
ndpointer in ctypes structure field
I cannot figure out how to use numpy.ndpointer as a field in a python ctypes structure. Here is some basic code, showing how I can do this without using ndpointer, but I would like to know if it’s possible to use ndpointer as well if it’s possible! Using the above code this works fine But when I call this, I
Interrupting a Python C-extension with Ctrl-C using ctypes
I am creating a Python wrapper for a C-extension which is a driver for a sensor. I need to pass the Ctrl-C interrupt signal with Python to the driver so it ends the current acquisition phase and does not start a new one. I found these two related subjects : Allowing Ctrl-C to interrupt a python C-extension Allowing Ctrl-C to
Does calling a c function via ctypes in python release the GIL during execution of the C code
I want to call some c function from python to be able to improve performance of my code. But I cannot find online whether when I call a C function using the ctypes libraries the GIL is released. As a simple example: Is the GIL released during the call to fun.sleep? Answer According to [Python.Docs]: ctypes.CFUNCTYPE(restype, *argtypes, use_errno=False, use_last_error=False) (emphasis
Segmentation fault when calling a more complex C++ function from Python with ctypes [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 1 year ago. Improve this question I have a function in C++ code which I want to call from
Using PR_SET_NAME from Python
I’ve been using the following code for a while: With Python-2.6 on RHEL6 this works, changing process name to “meow”. With Python-3.7 on RHEL7, however, after going through same code, the process name becomes “m” — just the first letter of the string. What’s going on? Answer The ctypes prctl is probably expecting 8-bit strings, and in Python 3 you’re
How to set arbitrary size array in ctypes?
So I have a function imported from a .dll library that takes in a pointer to a struct of the form: The idea of function is that if A is NULL, then function(D*) will update A with the size of the required buffer. Hence, if on the other hand B is an array of size A, then function(D*) will return
How do I get values from a C dll array pointer using ctypes and Python
A DLL provides a pointer to a 1D array in my C code like this: I’m building a Python project where I need to access the values of the same array. I’ve tried the following but get an access violation when I try iterate surfaceData. I’m accessing the wrong memory location but I’m not too sure what I’ve done wrong.
how to write C++ DLL file for python correctly?
this is my test.cpp file.(I also used makefile to create dll file) when I run following code in python everything is ok and I get this output from python. but when I change my test.cpp in this way(I just uncommented iostream): I get the following error from python. this is also my dependencies enter image description here by the way