1. 关键词

关键词:

C++ 系统调用 工作路径 Home目录 跨平台

应用场景:

  • 获取C++编译的二进制程序当前的工作目录,如:用于存储或读取缓存文件。
  • 获取用户的Home目录,如:用于保存或加载用户配置。

2. sysutil.h

#pragma once

#include <cstdint>
#include <string>

namespace cutl
{
    /**
     * @brief Get the working directory of the current excuting process.
     *
     * @return file path of the working directory
     */
    std::string getcwd();

    /**
     * @brief Get the home dir for the current user.
     *
     * @return std::string the home directory.
     */
    std::string homedir();
} // namespace cutl

3. sysutil.cpp


#include <map>
#include <iostream>
#include <strutil.h>
#include <cstdlib>
#include "sysutil.h"
#include "inner/logger.h"

#if defined(_WIN32) || defined(__WIN32__)
    #include<direct.h>
#else
    #include <unistd.h>
#endif

namespace cutl
{
    std::string getcwd()
    {
        static constexpr int MAX_PATH_LEN = 1024;
#if defined(_WIN32) || defined(__WIN32__)
        char buffer[MAX_PATH_LEN] = {0};
        char *presult = _getcwd(buffer, MAX_PATH_LEN);
        if (nullptr == presult)
        {
            CUTL_ERROR("_getcwd failure, presult is nullptr");
            return "";
        }
        return std::string(presult);
#else
        char buffer[MAX_PATH_LEN] = {0};
        char *presult = getcwd(buffer, MAX_PATH_LEN);
        if (nullptr == presult)
        {
            CUTL_ERROR("getcwd failure, presult is nullptr");
            return "";
        }
        return std::string(presult);
#endif
    }

    std::string homedir()
    {
#if defined(_WIN32) || defined(__WIN32__)
        return cutl::getenv("USERPROFILE", "");
#else
        return cutl::getenv("HOME", "");
#endif
    }
} // namespace cutl

4. 测试代码

#include "common.hpp"
#include "sysutil.h"

void TestGetcwdAndHomedir()
{
    PrintSubTitle("TestGetcwdAndHomedir");

    std::cout << "working directory: " << cutl::getcwd() << std::endl;
    std::cout << "Home directory: " << cutl::homedir() << std::endl;
}

5. 运行结果

----------------------------------------TestGetcwdAndHomedir----------------------------------------
working directory: /Users/spencer/workspace/common_util
Home directory: /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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