cffi | 易学教程

断网环境下利用pip安装Python离线安装包

阅读更多关于断网环境下利用pip安装Python离线安装包

断网环境下利用pip安装Python离线安装包学习了:https://www.cnblogs.com/michael-xiang/p/5690746.html 自己下载安装文件的地方： https://pypi.org/ pip install requests-2.19.1 需要 chardet-3.0.4, idna-2.7, urllib3-1.23, certifi-2018.4.16； https://packaging.python.org/tutorials/installing-packages/ pip install ./ downloads / SomeProject - 1.0 . 4. tar . gz pip install chardet-3.0.4.tar.gz pip install idna-2.7.tar.gz pip install urllib3-1.23.tar.gz pip install certifi-2018.4.16.tar.gz pip install requests-2.19.1.tar.gz 对于PyMySQL的安装需要如下安装包 pip install asn1crypto- 0.24 . 0 . tar .gz pip install six- 1.11 . 0 . tar .gz pip install

vpp系列4-pythonApi

阅读更多关于 vpp系列4-pythonApi

前置 python操作vpp，见官网介绍安装 apt-get install vpp-api-python python3-vpp-api vpp-dbg vpp-dev 没有pip的请安装pip，然后需要安装包cffi apt-get install python3-pip pip3 install cffi 代码 #!/usr/bin/env python from __future__ import print_function import os import fnmatch from vpp_papi import VPP CLIENT_ID = "Vppclient" VPP_JSON_DIR = '/usr/share/vpp/api/core' API_FILE_SUFFIX = '*.api.json' def load_json_api_files(json_dir=VPP_JSON_DIR, suffix=API_FILE_SUFFIX): jsonfiles = [] for root, dirnames, filenames in os.walk(json_dir): for filename in fnmatch.filter(filenames, suffix): jsonfiles.append(os.path.join(json_dir,

simplest possible python cffi example

阅读更多关于 simplest possible python cffi example

问题 I am trying to call a c function or c program from python using cffi, but I find most examples too complex for me to easily learn from. One of the best examples I have found is this example and I have copied that and made a slightly simpler version that I want to post here. I would greatly appreciate any feedback on this example or I am hoping someone could make an even shorter and simpler example of using cffi in python for API out of line and inline and maybe even a super simple ABI example

simplest possible python cffi example

阅读更多关于 simplest possible python cffi example

【numpy】新版本中numpy（numpy>1.17.0）中的random模块

阅读更多关于【numpy】新版本中numpy（numpy>1.17.0）中的random模块

【推荐阅读】微服务还能火多久？>>> numpy是Python中经常要使用的一个库，而其中的random模块经常用来生成一些数组，本文接下来将介绍numpy中random模块的一些使用方法。首先查看numpy的版本： import numpy numpy. __version__ '1.18.2' numpy获得随机数有两种方式：结合BitGenerator生成伪随机数结合Generate从一些统计分布中采样生成伪随机数 BitGenerator：生成随机数的对象。包含32或64位序列的无符号整数 Generator：将从BitGenerator生成的随机数序列转换为遵从特定概率分布（均匀、正态或二项式等）的数字序列的对象。从Numpy版本1.17.0开始，可以使用许多不同的BitGenerators初始化Generator。它包含了许多不同的概率分布。传统的RandomState随机数例程仍然可用，但仅限于单个BitGenerator。为了方便和向后兼容，单个RandomState实例的方法被导入到numpy.random命名空间。默认情况下，Generator使用PCG64提供的位，该位具有比RandomState中的传统mt19937随机数生成器更好的统计属性。使用旧的numpy.random.RandomState from numpy import

Need advice on how to print a matrix in lisp

阅读更多关于 Need advice on how to print a matrix in lisp

问题 I have a matrix defined so if I do this (format t "~a" (get-real-2d 0 0)) it prints out the element in the first row first column and if I do this (format t "~a" (get-real-2d a 0 1)) it prints out the element in first row second column and if I do this (format t "~a" (get-real-2d a 1 0)) it prints out the element in second row first column. The matrix a looks like this a = ((0 1 2) (3 4 5) (6 7 8)) and I was hoping you can show me exactly how to write a dotimes loop or other loop that would

How to call native c function with windows HANDLE in common lisp / cffi

阅读更多关于 How to call native c function with windows HANDLE in common lisp / cffi

问题 native c header: typedef HANDLE HCAMERA; int Begin(HCAMERA* h); int End(HCAMERA h); HANDLE is defined: typedef void *HANDLE; native c source I want: HCAMERA h; int r = 0; r = Begin(&h); VERIFY(r); r = End(h); VERIFY(r); I tried following code in sbcl 1.3.1 but not working. (cffi:use-foreign-library "camera.dll") (cffi:defcfun "Begin" :int (handle :pointer)) (cffi:defcfun "End" :int (handle :pointer)) (defparameter *camera* (cffi:foreign-alloc :pointer)) ; alloc handle (cffi:with-foreign

CFFI Not Loading Dependent Libraries?

阅读更多关于 CFFI Not Loading Dependent Libraries?

问题 I am trying to use the BLAS/LAPACK libraries from SBCL (specifically trying to get the LLA package running). I was having a lot of troubles getting the BLAS shared library to load; eventually I discovered that it wasn't able to load its dependent libraries. Eventually I was able to load BLAS by loaded all of its dependencies manually: (setq cffi::*foreign-library-directories* '("C:/cygwin64/bin/" "C:/cygwin64/lib/lapack/")) (CFFI:LOAD-FOREIGN-LIBRARY "CYGWIN1.DLL") (CFFI:LOAD-FOREIGN-LIBRARY

Common Lisp: This is not a number NIL and &rest parameters

阅读更多关于 Common Lisp: This is not a number NIL and &rest parameters

问题 On this line ((pointerp (first args)) (mem-aref (%vector-float-to-c-array (first args)) :float (second args))) in the below code the (second args) compiles with the warning This is not a number NIL . The function works but how do I get rid of this warning in an implimentation independent way using just Lisp. The solution would need to be really fast. The code took a long time to get to right and runs great so I can't really change the operation of it. the functions you don't recognize don't

How do i write a comparable cffi:translate-into foreign defmethod for this cffi:translate-from-foreign?

阅读更多关于 How do i write a comparable cffi:translate-into foreign defmethod for this cffi:translate-from-foreign?

问题 ok I tried this translate-from-foreign method and it did work I have these defined in my structs.lisp file in my library which loads first before all my other dependencies (cffi:defcstruct (cv-size :class cv-size-type) (width :int) (height :int)) (defmethod cffi:translate-from-foreign (p (type cv-size-type)) (let ((plist (call-next-method))) (make-size :width (getf plist 'width) :height (getf plist 'height)))) and my opencv wrappers for CvGetSize and cvCreateImage, get-size and create-image,