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  • 获取标准shell 命令的输出内容

    cmdline.h

    #include <iostream> #include <mutex>

    class Cmdline {

    private:

            Cmdline() = default;

    public:

            ~Cmdline() = default;

            Cmdline(const Cmdline& cmd) = delete;

            Cmdline& operator=(const Cmdline& cmd) = delete;

    public:

            static Cmdline& getInstance();

            void executeCMD(const std::string& cmd, std::string& result);

    private:

            static std::mutex m_mutex;

    };

    cmdline.cpp

    #include "cmdline.h"

    #include "stdio.h"

    std::mutex Cmdline::m_mutex;

    Cmdline& Cmdline::getInstance()

    {

            std::lock_guard<std::mutex> lck(m_mutex);

            static Cmdline instance;

            return instance;

    }

    void Cmdline::executeCMD(const std::string& cmd, std::string& result)

    {

            char buf_ps[1024] = {0};

            std::string temp_cmd = cmd + " 2>&1"; //标准错误重定向到标准输出

            FILE* ptr = nullptr;

            if((ptr = popen(temp_cmd.c_str(), "r")) != nullptr)

            {

                    while(fgets(buf_ps, 1024, ptr) != nullptr)

                    {

                            result += buf_ps;

                    }

                    pclose(ptr);

                    ptr = nullptr;

            }

            else

            {

                    std::cout << "popen %s error!!" << std::endl;

            }

    }

    test.cpp

    #include "cmdline.h"

    int main(int argc, char* argv[])

    {

            if(argc != 2)

            {

                    std::cout << "error number args" << std::endl;

                    return -1;

            }

            std::string strResult = "";

            std::string cmd = argv[1];

            Cmdline::getInstance().executeCMD(cmd, strResult);

            std::cout << "result: " << strResult << std::endl;

            return 0;

    }

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  • 原文地址:https://www.cnblogs.com/henryliublog/p/9700611.html
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