c++获取ubuntu系统用户名

c++代码中自动获取系统用户名,因此不必再纠结换电脑后需要再修改用到系统用户名的代码模块了,应用案例:将数据写到系统本地目录下。

具体实现代码如下:

首先,作为一个常用功能,可以将获取用户名代码封装为功能函数,为提高代码效率,可定义为inline函数:

#include <unistd.h>
#include <pwd.h>

class Utility
{
    public:
    inline std::string getUserName(){
        struct passwd* pwd;
        uid_t userid;
        userid = getuid();
        pwd = getpwuid(userid);
        // cout<<pwd->pw_name<<endl;
        return pwd->pw_name;
    }
};

其次,在代码中调用上述函数,获取用户名,生成本地文件目录:

bool Bbx::saveLog(std_srvs::Empty::Request &request, std_srvs::Empty::Response &response)
    {
      ROS_WARN("save data to TXT ......");

      // //! get system user name.
      // struct passwd* pwd;
      // uid_t userid;
      // userid = getuid();
      // pwd = getpwuid(userid);
      // cout<<pwd->pw_name<<endl;
      std::string username = utility.getUserName();

      // ****** 保存数据到本地txt文件
      // estimates
      // std::string filePath = "/home/chenlu/est.txt";
      std::string filePath = "/home/"+username+"/est.txt";      
      std::ofstream outFile1;    
      outFile1.open(filePath, std::ios::app|std::ios::out);
      outFile1<<std::fixed;
      outFile1.precision(3);
      if(outFile1.bad()){
          cout<<"cannot create file: "<<filePath<<endl;
          return 1;
      }
      for(int i=0; i<PCL::bbxEst.size(); i++){
          outFile1<<PCL::bbxEst[i][0]<<"\t"<<PCL::bbxEst[i][1]<<"\t"<<PCL::bbxEst[i][2]<<endl;
      }
      outFile1.close();
      // std::cout<<"estimates saved in file = "<<filePath<<endl;  
      ROS_WARN_STREAM("estimates saved in file = "<<filePath);

参考资料:

https://blog.csdn.net/qq_31175231/article/details/76461870

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转载自blog.csdn.net/qq_18276949/article/details/105813567