I am working with some C code called from Python using ctypes. Somewhere in the bowels of the C library, an exception is occurring and/or abort() is being called. Is there any way I can catch this in my Python caller code? (Platform is Linux) ...
I could use some help assigning to a global C variable in DLL using ctypes. The following is an example of what I'm trying: test.c contains the following #include <stdio.h> char name[60]; void test(void) { printf("Name is %s\n", name); } On windows (cygwin) I build a DLL (Test.dll) as follows: gcc -g -c -Wal...
I've been using ctypes-opencv for a while. If I run cvGoodFeaturesToTrack the way it is used in the demo, I get the following error: OpenCV ERROR: Null pointer (NULL array pointer is passed) in function cvGetMat, cxarray.cpp(2780) Terminating the application... called from cvUnregisterType, cxpersistence.cpp(4933) Terminating th...
I am writing a program to handle data from a high speed camera for my Ph.D. project. This camera comes with a SDK in the form a .so file on Linux, for communicating with the camera and getting images out. As said it is a high speed camera delivering lots of data, (several GB a minute). To handle this amount of data the SDK has a very han...
Is there anyway to know which functions exported from the dll througth python foreign function library -ctypes- and if possible to know details about the exported functions throught ctypes. if yes could someone provide snippet of code ...
Hello. I have made a C++ library and have built a .dylib dynamic library from it. However when I load it with ctypes, it fails. Something doesn't seem to have linked properly. I have no idea why. The error (The relevant part): cscalelib.setup_framebuffer(flip,surface.frame_buffer,surface.texture,surface._scale[0],surface._scale[1])...
Could someone help me how should I call the following function using ctypes python library: DWORD myfunc(LPCSTR a,BYTE b, LPBYTE c, LPDWORD d, LPCBYTE *e,DWORD LEN) How should I declare and initialize the arguments of the mentioned functions? Could someone provide an example? ...
Disclaimer: I'm new to windows programming so some of my assumptions may be wrong. Please correct me if so. I am developing a python wrapper for a C API using ctypes. The API ships with both 64 and 32 DLLs/LIBs. I can succesfully load the DLL using ctypes.WinDLL('TheLibName') and call functions etc etc. However some functions were not ...
I have tried two brands of ctypes (ctypes-opencv and another) wrappers for OpenCV (2.0 from svn head), can use Python and OpenCV in the Python console, but whenever I try to import the packages (from ctypes_opencv import *) from another Python file, I get the following error message: OSError: dlopen(/usr/local/lib/libcv.dylib, 6): ...
I have no idea what is wrong with the simple code. The function is for use with python and ctypes. extern "C" void add_lines(bool antialias,GLdouble coordinates[][2],int array_size,GLdouble w,GLdouble r,GLdouble g, GLdouble b,GLdouble a){ glDisable(GL_TEXTURE_2D); if (antialias){ glEnable(GL_LINE_SMOOTH); //Enable line s...
I'm building an app with PySide, there's some image manipulation that needs to be done and using Python code for this is way too slow. Therefore I hacked out a .dll file that will do it for me. The function definition is as follows: extern "C" { QRectF get_image_slant(QImage *img, float slantangle, float offset) { Now I can load th...
I've got code that takes a PIL image and converts it to a ctypes array to pass out to a C function: w_px, h_px = img.size pixels = struct.unpack('%dI'%(w_px*h_px), img.convert('RGBA').tostring()) pixels_array = (ctypes.c_int * len(pixels))(*pixels) But I'm dealing with big images, and unpacking that many items into function arguments ...
I'm trying to embed python within a C++ based programming language (CCL: The compuatational control language, not that any of you have heard of it). Thus, I don't really have a "main" function to make calls from. I have made a test .cc program with a main, and when I compile it and run it, I am able to import my own python modules and s...
I have a Python module, wrapper.py, that wraps a C DLL. The DLL lies in the same folder as the module. Therefore, I use the following code to load it: myDll = ctypes.CDLL("MyCDLL.dll") This works if I execute wrapper.py from its own folder. If, however, I run it from elsewhere, it fails. That's because ctypes computes the path relativ...
Hi all - I'm attempting to write a Python wrapper for poker-eval, a c static library. All the documentation I can find on ctypes indicates that it works on shared/dynamic libraries. Is there a ctypes for static libraries? I know about cython, but should I use that or recompile the poker-eval into a dynamic library so that I can use cty...
I am trying to use PythonMagickWand to use a Shepards distortion on an image. You can also see the source of distort.c that is used by ImageMagick. PythonMagickWand does not by default support Shepards distortion. To fix this, I added in: ShepardsDistortion = DistortImageMethod(15) to line 544 of PythonMagickWand (See here for my modi...
I have a 64 bit RHEL host with 32 bit libraries installed. One vendor has a 32 bit .so I'd like to load into Python using ctypes. from ctypes import CDLL CDLL('32bitdinosaur.so') OSError: 32bitdinosaur.so: wrong ELF class: ELFCLASS32 Of course 64 bit libraries are OK. Eg: CDLL('libc.so.6') Works fine. ...
Hello, In brief, I am trying to call into a shared library from python, more specifically, from numpy. The shared library is implemented in C using sse2 instructions. Enabling optimisation, i.e. building the library with -O2 or –O1, I am facing strange segfaults when calling into the shared library via ctypes. Disabling optimisation (-O...
Hi! I'm trying to learn python and have encountered some strange behaviour. I am experimenting with ctypes and a self-made (very simple) DLL. This is Python script I'm trying to run: from ctypes import * myLib = CDLL("libDlltest") myLib.hello() myLib.goodbye() print 'I am a line' myLib.goodbye() I've configured eclipse according t...
Hi, after having no success with my question on How to use float ** in Python with Swig?, I started thinking that swig might not be the weapon of choice. I need bindings for some c functions. One of these functions takes a float**. What would you recomend? Ctypes? Interface file: extern int read_data(const char *file,int *n_,int *m_,f...