Hu Wan huwan

Cython example of exposing C-computed arrays in Python without data copies

The goal of this example is to show how an existing C codebase for numerical computing (here c_code.c) can be wrapped in Cython to be exposed in Python.

The meat of the example is that the data is allocated in C, but exposed in Python without a copy using the PyArray_SimpleNewFromData numpy

Linux 定时使用脚本检测程序运行状态并通过飞信进行通知

可以通过输入进程号（精确匹配）（注）或者特定的进程名称（模糊匹配）
当程序完成退出后，通过中国移动[命令行飞信] 1 进行提醒
需结合crontab 计划任务服务，每隔10分钟执行一次检测任务

注：因为是使用ps -ef + grep 所以，有可能一个进程号在多列出现，并不是完全意义上的精确匹配，但实际使用中一般不会出问题，可以先人工确认一下是否唯一

Installing PDFtk Server edittion on your Mac

This workaround install is necessary because PDFtk was pulled from homebrew-cask due to issues with it aggressively overwriting file permissions that could impact other installed libraries. See this homebrew-cask issue.

The following steps worked on Mac OS X 10.10.1 with a standard brew installation for the PDFtk Mac OS X server libary version 2.02.

All Terminal commands separated by a full line space. Some commands wrap into multiple lines.

Download and extract the Mac OS X server install pacakge

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

	#include <Python.h> // Must be first
	#include <vector>
	#include <stdexcept>
	#include "PyUtils.h"
	using namespace std;

	// =====
	// LISTS
	// =====

	EXEC = $(shell basename $$(pwd))
	CC = gcc

	CFLAGS = -std=gnu11 -O3 -Wall -Wextra -Wpedantic -Wstrict-aliasing
	CFLAGS += $(shell pkg-config --cflags glib-2.0 gio-2.0)
	LDFLAGS = $(shell pkg-config --libs glib-2.0 gio-2.0)

	SRC = $(wildcard *.c)
	OBJ = $(SRC:.c=.o)

	#!/bin/sh
	# $Id: pdf2eps,v 0.01 2005/10/28 00:55:46 Herbert Voss Exp $
	# Convert PDF to encapsulated PostScript.
	# usage:
	# pdf2eps <page number> <pdf file without ext>

	pdfcrop $2.pdf
	pdftops -f $1 -l $1 -eps "$2-crop.pdf"
	rm "$2-crop.pdf"
	mv "$2-crop.eps" $2.eps

	#!/bin/sh
	if [ $# -lt 1 ]; then
	echo "Usage :: $0 input.pdf [p1 p2 ...]"
	exit
	fi
	in=${1}
	shift
	pdfcrop ${in}
	crop=`basename -s .pdf ${in}`-crop
	if [ $# -eq 0 ]; then

	sudo add-apt-repository ppa:ubuntu-toolchain-r/test
	sudo apt-get update
	sudo apt-get install gcc-5 g++-5

	sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 60 --slave /usr/bin/g++ g++ /usr/bin/g++-5

	#!/usr/bin/env bash
	awk '{w = w + $2; e = e + $1 * $2;} END {print e/w}'