getenv

php 重要工具函数

Deadly 提交于 2019-12-05 23:09:50
1. 字符串分隔函数 : 把src按 #分隔后放入数组 array中。 $Array = explode('#',$src); 2. 计算数组长度 count $len= count($Array); 遍历数组 for ($i=0; $i<$count; $i++) { echo Array[$i]; } 3. 创建数组函数 array(); $Myarray = array(); 4. xml 模板函数, function get_xml_str($act,$msg){ if(!$msg){ $result=0; $msg='success'; }else{ $result=$msg; $msg='error'; } $xml_str='<?xml version="1.0" encoding="UTF-8" ?>'; $xml_str.="<XXXX>"; $xml_str.="<action>$act</action>"; $xml_str.="<result>$result</result>"; $xml_str.="<msg>$msg</msg>"; $xml_str.="</XXXX>"; return $xml_str; } 5.获取IP <? function GetIP() { if ($_SERVER["HTTP_X_FORWARDED_FOR"]) $ip =

System.Properties和System.getenv区别

一个人想着一个人 提交于 2019-12-05 19:31:41
网上很多使用的是getProperties。说获得系统变量,但是其实不正确。getProperties中所谓的"system properties"其实是指"java system",而非"operation system",概念完全不同,使用getProperties获得的其实是虚拟机的变量形如: -Djavaxxxx。 getenv方法才是真正的获得系统环境变量,比如Path之类。其方法命名方式有违Sun命名规范其实。 意思就是说:希望使用Java的系统变量替代操作系统的变量获取,如果你想访问某个系统的环境变量(operation system properties),请把他重新定义个名字,传给Java的JVM变量(jvm system properties)。要获得系统的环境变量,请使用: getenv()方法。 这才最正确。 getProperties() Determines the current system properties. public static Properties getProperties() Determines the current system properties. First, if there is a security manager, its checkPropertiesAccess method is called with

Android存储空间讲解

旧城冷巷雨未停 提交于 2019-12-05 18:39:58
http://blog.fidroid.com/post/android/ru-he-zheng-que-huo-de-androidnei-wai-sdqia-lu-jing 如何正确获得Android内外SD卡路径 方法一 方法二 外置sd卡路径,也许很多同学在平时的工作中并不会用到,因为现在很多机型都不支持外置sd卡(这也是Google目标),所以并不用考虑外置sd卡的路径问题。除了开发文件管理类的应用之外,其他应用使用 Enviroment 这个类中的一些静态方法就能满足需要。但也有一些特殊需求需要用到外置sd卡路径,那怎么才能准确获得外置sd卡的路径呢? 方法一 //内置sd卡路径 String sdcardPath = System . getenv ( "EXTERNAL_STORAGE" ); //内置sd卡路径 String sdcardPath = Environment . getExternalStorageDirectory (). getAbsolutePath (); //外置置sd卡路径 String extSdcardPath = System . getenv ( "SECONDARY_STORAGE" ); 在Enviroment类的源码中获得sd卡路径其实也是通过 System.getnv() 方法来实现的,如隐藏的方法: /** {

如何正确获得Android内外SD卡路径

纵饮孤独 提交于 2019-12-05 18:33:11
PS:看了9年的小说,自己开始动手写了一本,请各位猿们动动手指,点击下,有起点账号的可以收藏下!! 《武意长存》 忘了这篇文章是在哪里看到了,当时就copy保存了下来,今天转载出来下。 外置sd卡路径,也许很多同学在平时的工作中并不会用到,因为现在很多机型都不支持外置sd卡(这也是Google目标),所以并不用考虑外置sd卡的路径问题。除了开发文件管理类的应用之外,其他应用使用 Enviroment 这个类中的一些静态方法就能满足需要。但也有一些特殊需求需要用到外置sd卡路径,那怎么才能准确获得外置sd卡的路径呢? 方法一 //内置sd卡路径 String sdcardPath = System . getenv ( "EXTERNAL_STORAGE" ); //内置sd卡路径 String sdcardPath = Environment . getExternalStorageDirectory (). getAbsolutePath (); //外置置sd卡路径 String extSdcardPath = System . getenv ( "SECONDARY_STORAGE" ); 在Enviroment类的源码中获得sd卡路径其实也是通过 System.getnv() 方法来实现的,如隐藏的方法: /** {@hide} */ public static File

C函数之genv

被刻印的时光 ゝ 提交于 2019-12-04 06:03:28
函数原型: include<stdlib.h> char *getenv(char *envvar); 函数说明: getenv()用来取得参数envvar环境变量的内容。参数envvar为环境变量的名称,如果该变量存在则会返回指向该内容的指针。环境变量的格式为envvar=value。getenv函数的返回值存储在一个全局二维数组里,当你再次使用getenv函数时不用担心会覆盖上次的调用结果。 返回值: 执行成功则返回指向该内容的指针,找不到符合的环境变量名称则返回NULL。如果变量存在但无关联值,它将运行成功并返回一个空字符串,即该字符的第一个字节是null。 实例 /*** getenv.c ***/ #include<stdio.h> #include<stdlib.h> int main() { char *s = NULL; s = getenv("HOME"); printf("%s\n",s); return 0; } 运行结果: 来源: https://www.cnblogs.com/wanghao-boke/p/11834584.html

How do I read an environment variable in Verilog/System Verilog?

匿名 (未验证) 提交于 2019-12-03 08:46:08
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: How do I read an environment variable in Verilog ? (Running on a VCS simulator) I am trying to accomplish File=$fopen("$PATH/FileName","r"); $PATH is an environment variable. 回答1: You can simply use SystemVerilog DPI for getting environment. And because getenv is a standard C library for every POSIX platform, so you do not need to implement your own getenv() equivalent function for the function definition again. Example code in SV. import "DPI-C" function string getenv(input string env_name); module top; initial begin $write("env = %s\n",

Is it safe to use getenv() in static initializers, that is, before main()?

匿名 (未验证) 提交于 2019-12-03 08:35:02
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I looked in Stevens , and in the Posix Programmer's Guide , and the best I can find is An array of strings called the enviroment is made available when the process begins. This array is pointed to by the external variable environ , which is defined as: extern char **environ; It's that environ variable that has me hesitating. I want to say -The calling process/shell has already allocated the block of null terminated strings -the 'external' variable environ is used as the entry point by getenv() . - ipso facto feel free to call getenv() within

“Operation not permitted” while dropping privileges using setuid() function

匿名 (未验证) 提交于 2019-12-03 03:10:03
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: Why this simple programs that use os.setuid()/gid() fails? Is written in python but I think that is not a language relative problem (at the end are all the same posix system call): import os, pwd if os.getenv("SUDO_UID") and os.getenv("SUDO_GID"): orig_uid=int(os.getenv("SUDO_UID")) orig_gid=int(os.getenv("SUDO_GID")) else: pw = pwd.getpwnam("nobody") orig_uid = pw.pw_uid orig_gid = pw.pw_gid print os.getuid(), os.getgid(), os.geteuid(), os.getegid(), orig_uid, orig_gid os.setgid(orig_gid) os.setuid(orig_uid) It returns this exception: $

Proper way to use System environment variables in gradle using Android Studio

匿名 (未验证) 提交于 2019-12-03 03:04:01
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: I am using Android Studio to build my project on an Ubuntu 14.04 system. I wrote the following in my build.gradle files to avoid hardcoding storeFile, storePassword, keyAlias and keyPassword in my git repo: signingConfigs { debug { storeFile file(System.getenv("KEYSTORE")) storePassword System.getenv("KEYSTORE_PASSWORD") keyAlias System.getenv("KEY_ALIAS") keyPassword System.getenv("KEY_PASSWORD") } But gradle sync errors out with the following: Error:(49, 0) Neither path nor baseDir may be null or empty string. path='null' basedir='./pathto

Proxy setting for R

匿名 (未验证) 提交于 2019-12-03 02:05:01
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am facing problem while conecting R with internet in my office. May be this due to LAN settings. I tried the almost all possible ways I come across in the web (see below) but still in vain. Method1: Invoking R using --internet2 Method2: Invoking R by setting ~/Rgui.exe http_proxy=http:/999.99.99.99:8080/ http_proxy_user=ask Method3: Setting Setinternet2=TRUE Method4: curl In above all methods I can able to load packages directly from CRAN also able to download files using download.file command But using getURL(RCurl) ,