I’m using a third party python library, that is using ctypes (it uses a dll). I’m not very familiar with ctypes. The lib offers a type definition and a structure definition as given in the minimum example below. I’m trying to assign the member variable myClassInst.MSGTYPE the value of the constant MYConst. Afterwards I want to check the value with
Tag: ctypes
OSError: [WinError 193] %1 is not a valid Win32 application while reading custom DLL in python with CTypes
I am trying to write code that wraps a C library in python. I am planning on using CTypes to do it and I used visual studio to compile my DLL. I started with a simple function and I added the following in a header within Visual Studio that was then built to a DLL My python wrapper is the
How do I copy a part of bytearray to c_void_p-referenced memory and vice versa?
In the Python application, I have a bytearray with some data. My python code is called by some external native library (DLL/so/dylib) (using ctypes and its callback functions). One of the callback functions includes a pointer to the unmanaged buffer, allocated in that external library. I need to copy a part of the bytearray into this unmanaged buffer or copy
Access a global pointer in C from python using ctypes
I know that if I have a global variable (let’s say a double called N) I can read it using: but what if my variable is a pointer? How can I read the contents of the pointer in to a python list? To be clearer, N is declared in the following way in the shared library: Answer Given this (Windows)
Accessing C array in golang
I have two files, module.go and test.py. My goal is to speed up some calculations that is done in python, but have an issue accessing array of integers in go. module.go and simple test file in python: After compiling go module with go build -buildmode=c-shared -o gomodule.so module.go and fire up python file I got: I get that C array
How to model struct that contains reference to it’s definition in python through ctypes?
trying to wrap struct the reference it’s definition as below foo.c how to model that, for example foo.py of course python doesn’t interpret that, I could use c_void_p instead of pointer(Foo), and cast it’s value as follow but, is there a way to model that struct in a python class? Answer From [Python.Docs]: ctypes – Incomplete Types: … . In
Python – Difference Between Windows SystemParametersInfoW vs SystemParametersInfoA Function
I have a quick question that I cannot seem to clarify, despite my research on Stack Overflow and beyond. My questions involves the Windows SystemParametersInfo function with its variants SystemParametersInfoW (Unicode) and SystemParametersInfoA (ANSI) in relation to a Python 3.x script. In a Python script I am writing, I came across two different explanations into when to use these variants.
Missing attribute `value` for equal ctypes array objects
I know 2 ways of creating a c array out of a python sequence data = (1, 2, 3, 4, 5, 6). Creating an array class, initializing it and passing the values through the value attribute: Creating an array class and passing the value as arguments during initialization: Both generates the same type: But when trying to access the value
How to specify what actually happens when Yes/No is clicked with ctypes MessageBoxW?
Ive seen a lot of people show this code, however nobody has ever specified how to actually make the Yes/No work. Theyre buttons, and they are there, however how does one specify what actually happens when you click either or? Answer Something like this with proper ctypes wrapping: See the documentation for MessageBox for the various value of the utype
Accessing a structure element in Python
I’m having trouble accessing a structure element. Notice that I have read something into the structure using sscanf (to simulate my actual routine) but Python does not seem to realize that. So I added a statement to assign a value, then Python realizes there is something there. This only happens when I’m reading into a strcuture … as I have