1. 关键词
C++ 系统调用 环境变量 getenv 跨平台
2. sysutil.h
#pragma once
#include <cstdint>
#include <string>
namespace cutl
{
std ::string getenv (const std ::string &name, const std ::string &default_value) ;
}
3. sysutil.cpp
#include <map>
#include <iostream>
#include <strutil.h>
#include <cstdlib>
#include "sysutil.h"
#include "inner/logger.h"
#include "inner/system_util.h"
#include "inner/filesystem.h"
namespace cutl
{
std ::string getenv (const std ::string &name, const std ::string &default_value)
{
const char *text = std ::getenv(name.c_str());
if (text == nullptr)
{
CUTL_ERROR("variable [" + name + "] not set, fallback to " + default_value);
return default_value;
}
return std ::string (text);
}
}
4. 测试代码
#include "common.hpp"
#include "sysutil.h"
void TestGetEnv ()
{
PrintSubTitle("TestGetEnv" );
auto result = cutl::getenv("PATH" , "not found" );
std ::cout << "getenv for PATH, result:" << std ::endl
<< result << std ::endl ;
std ::cout << "USERPROFILE: " << cutl::getenv("USERPROFILE" , "not found" ) << std ::endl ;
std ::cout << "PROCESSOR_ARCHITECTURE: " << cutl::getenv("PROCESSOR_ARCHITECTURE" , "not found" ) << std ::endl ;
std ::cout << "HOME: " << cutl::getenv("HOME" , "not found" ) << std ::endl ;
}
5. 运行结果
---------------------------------------------TestGetEnv---------------------------------------------
getenv for PATH, result:
/usr/local/bin:/usr/local/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/usr/local/go/bin
USERPROFILE: [2024-06-21 21:32:28.863][E]]0x7ff85b8d5fc0](cutl) [sysutil.cpp:208:getenv] variable [USERPROFILE] not set , fallback to not found
not found
PROCESSOR_ARCHITECTURE: [2024-06-21 21:32:28.863][E]]0x7ff85b8d5fc0](cutl) [sysutil.cpp:208:getenv] variable [PROCESSOR_ARCHITECTURE] not set , fallback to not found
not found
HOME: /Users/spencer
6. 源码地址
更多详细代码,请查看本人写的C++ 通用工具库: common_util , 本项目已开源,代码简洁,且有详细的文档和Demo。
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