ctypes

WindowsError: [Error 127] The specified procedure could not be found

由 六眼飞鱼酱① 提交于 2021-02-20 18:45:46
问题 What does this error mean? I have trouble googling any docs. The code worked fine and suddenly broke after restarting windows. I looked in the process monitor and the DLL is found and accessed without any permission errors File "c:\Python27\lib\ctypes\__init__.py", line 435, in __getattr__ dll = self._dlltype(name) File "c:\Python27\lib\ctypes\__init__.py", line 365, in __init__ self._handle = _dlopen(self._name, mode) WindowsError: [Error 127] The specified procedure could not be found 回答1:

WindowsError: [Error 127] The specified procedure could not be found

由 谁说我不能喝 提交于 2021-02-20 18:44:22
问题 What does this error mean? I have trouble googling any docs. The code worked fine and suddenly broke after restarting windows. I looked in the process monitor and the DLL is found and accessed without any permission errors File "c:\Python27\lib\ctypes\__init__.py", line 435, in __getattr__ dll = self._dlltype(name) File "c:\Python27\lib\ctypes\__init__.py", line 365, in __init__ self._handle = _dlopen(self._name, mode) WindowsError: [Error 127] The specified procedure could not be found 回答1:

How to wrap the SendInput function to python using ctypes

由 て烟熏妆下的殇ゞ 提交于 2021-02-19 08:07:33
问题 I am trying to get the SendInput function from user32.dll to work in python using ctypes.I am a noob but from what I read from the docs you have to create the structs the function requires in python and then pass it to the function. import ctypes import keyboard from ctypes import * lib = windll.user32 KEYEVENTF_SCANCODE = 0x8 KEYEVENTF_KEYUP = 0x2 SPACEBAR = 57 # 0x39 INPUT_KEYBOARD = 1 class KEYBDINPUT(Structure): _fields_ = [('wVk' , c_ushort) , ('wScan' , c_ushort) , ('dwFlags' , c_ulong)

Calling C methods with Char** arguments from Python with ctypes

由 故事扮演 提交于 2021-02-19 05:01:47
问题 I need a way to pass an array to char* from Python using ctypes library to a C library. Some ways I've tried lead me to segmentation faults, others to rubbish info. 回答1: As I've been struggling with this issue for some time, I've decided to write a small HowTo so other people can benefit. Having this C piece of code: void passPointerArray(int size, char **stringArray) { for (int counter=0; counter < size; counter++) { printf("String number %d is : %s\n", counter, stringArray[counter]); } } We

Different behaviour of ctypes c_char_p?

由 倖福魔咒の 提交于 2021-02-18 09:51:13
问题 I am confused with this behaviour of different versions of python and dont understand why ? Python 2.7.5 (default, Aug 25 2013, 00:04:04) [GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> c="hello" >>> a=ctypes.c_char_p(c) >>> print(a.value) hello Python 3.3.5 (default, Mar 11 2014, 15:08:59) [GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.2.79)] on darwin Type "help", "copyright", "credits" or "license"

How do you write a full struct to shared memory in python?

由 天涯浪子 提交于 2021-02-17 04:58:31
问题 There are plenty of examples showing how to write single variables or even individual members of a struct to shared memory, but is there a way to put the whole struct into shared memory so that you can simply manipulate the struct to update shared memory? This is an example what I'm doing so far (in my actual program - there are over 50 fields in the struct - possibly 100+ by the time I'm done). It updates shared memory with x,y,z coordinates every 0.05 seconds. While it works as it sits, it

Ctypes: Parse Arguments and Return Results

由 谁说胖子不能爱 提交于 2021-02-16 15:36:26
问题 I am experimenting for the first time with ctypes in Python. I have written a C file which contains methods to make calculations so as to rotate points (and curves). My code is: #include "math.h" double * rotatePoint(double P[2], double angle) { static double Q[2]; Q[0] = P[0] * cos(angle * M_PI/180); Q[1] = P[1] * sin(angle * M_PI/180); return Q; } I have compiled it with GCC gcc -lm -shared lib.c -o lib.so In my Python Code: import ctypes lib = ctypes.CDLL('lib.so') def cRotatePoint(P):

ctypes struct returned from library

由 倾然丶 夕夏残阳落幕 提交于 2021-02-16 08:41:38
问题 Given a simple C file: #include <stdio.h> typedef struct point { int x; int y; } POINT; POINT get_point() { POINT p = {1, 2}; return p; } And I have a simple python file: from ctypes import * import os lib_name = '/testlib.so' test_lib = CDLL(os.getcwd() + lib_name) class POINT(Structure): _fields_ = [('x', c_int), ('y', c_int)] # Sets p1 to the integer 1 p1 = test_lib.get_point() # Sets p2 to the struct POINT with values {1, 0} p2 = POINT(test_lib.get_point()) How can I set my returned value

centos 编译python3.7.0 报错ModuleNotFoundError: No module named &apos;_ctypes&apos;

由 时光毁灭记忆、已成空白 提交于 2021-02-15 19:29:54
平台:CentOS7 先安装以下依赖 yum -y groupinstall "Development tools" yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel yum install libffi-devel -y make install 来源： oschina 链接： https://my.oschina.net/u/2654135/blog/3074409

关于在centos下安装python3.7.0以上版本时报错ModuleNotFoundError: No module named '_ctypes'的解决办法

由 感情迁移 提交于 2021-02-15 17:50:09
关于在centos下安装python3.7.0以上版本时报错ModuleNotFoundError: No module named '_ctypes'的解决办法 2018年02月12日 15:23:38 海棠未满 阅读数 91723 更多 分类专栏： Linux 软件安装 版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。 本文链接： https://blog.csdn.net/qq_36416904/article/details/79316972 3.7版本需要一个新的包libffi-devel，安装此包之后再次进行编译安装即可。 #yum install libffi-devel -y #yum 安装方法 若在安装前移除了/usr/bin下python的文件链接依赖，此时yum无法正常使用，需要自己下载相关软件包安装，为节省读者时间，放上链接 #wget http://mirror.centos.org/centos/7/os/x86_64/Packages/libffi-devel-3.0.13-18.el7.x86_64.rpm #rpm -ivh libffi-devel-3.0.13-18.el7.x86_64.rpm 安装完成后重新进行make install，结束后再次配置相关文件的软连接即可。 ——————
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