How to get the correct full file path from a remote linux machine correct

superwavelet · 05-19-2018, 04:01 PM

I use TigerVNC to access a remote linux machine. In my current path, if I type "pwd", then I got these lines shown in the ternial:

Code:

% pwd
/stateflow/devel
[myusername@sb33glnxa64: /stateflow/devel]
%

Right now, I want to write a program to run on the remote linux machine under /stateflow/devel/xx directory to save the file under this directory, but I tried to set the filePath to either

Code:

"\\\\sb33glnxa64\\stateflow\\devel\\MyLog.txt"
or
"\\stateflow\\devel\\MyLog.txt"

For example:

Code:

std::ofstream m_fStream;
std::string filePath("\\\\sb33glnxa64\\stateflow\\devel\\MyLog.txt");
m_fStream.open(filePath.c_str(), std::ofstream::out | std::ofstream::app);
m_fStream << "sMode is " << sMode << std::endl;
m_fStream.close();

But neither of them works, I cannot see the MyLog.txt file got created under the /stateflow/devel directory.

Not sure which path I should use here to set the filePath ? Thanks
By the way, I use C++

Note: the program to run is under a unknown temporary path /stateflow/devel/xx . So that's why I need to know the absolute path thus later I can find and open the MyLog.txt.

BW-userx · 05-19-2018, 04:18 PM

try taking a closer look at your slashes this / as apposed to this \

Quote:

Originally Posted by superwavelet

I use TigerVNC to access a remote linux machine. In my current path, if I type "pwd", then I got these lines shown in the ternial:

Code:

% pwd
/stateflow/devel
[myusername@sb33glnxa64: /stateflow/devel]
%

Right now, I want to write a program to save the file under this directory, but I tried to set the filePath to either

Code:

"\\\\sb33glnxa64\\stateflow\\devel\\MyLog.txt"
or
"\\stateflow\\devel\\MyLog.txt"

For example:

Code:

std::ofstream m_fStream;
std::string filePath("\\\\sb33glnxa64\\stateflow\\devel\\MyLog.txt");
m_fStream.open(filePath.c_str(), std::ofstream::out | std::ofstream::app);
m_fStream << "sMode is " << sMode << std::endl;
m_fStream.close();

But neither of them works, I cannot see the MyLog.txt file got created under the /stateflow/devel directory.

Not sure which path I should use here to set the filePath ? Thanks
By the way, I use C++

superwavelet · 05-19-2018, 04:23 PM

Quote:

Originally Posted by BW-userx

try taking a closer look at your slashes this / as apposed to this \

Thank you very much!

I have tried:

Code:

"//sb33glnxa64/stateflow/devel/MyLog.txt"
or
"/stateflow/devel/MyLog.txt"

But still doesn't work.

BW-userx · 05-19-2018, 05:00 PM

I am not familiar with remote access but I'd venture to say you're going to have to insure you have a connection, then take that and add it to the front of your path string then try to save it.

something I just whipped up. Creates a new file, adds to it then closes it in the path to indicated in hard code.

Code:

int main(int argc, char **argv)
{
    if (argc != 2)
    {
        cout<<"not enough args "<<argv<<endl;
        exit(EXIT_FAILURE);
    }
    std::string file = argv[1];
    std::string p = "/home/userx/Documents";
    p+="/";
    p += file;
    cout<<"P "<<p<<endl;
    fstream F;
    F.open( p, std::ifstream::out);
    if (F.is_open())
    {
        for (int i = 0; i < 10; i++)
        {
            F << i;
            F << endl;
        }

    }
    F.close();
    std::string line;
    F.open(p);
    if (F.is_open())
    {
        while ( getline(F, line) )
        {
            cout << line << endl;
        }
    }
    F.close();
   return 0;
}

results

Code:

$ pwd
/media/projects/C++Projects/screwingaround/bin/Debug

$ ./screwingaround mynewfile
P /home/userx/Documents/mynewfile
0
1
2
3
4
5
6
7
8
9

//file located here
$ ls ~/Documents
mynewfile

EDIT:

you're using a string then turning it into a char I do not know why

Code:

std::string filePath("\\\\sb33glnxa64\\stateflow\\devel\\MyLog.txt");
m_fStream.open(filePath.c_str(), std::ofstream::out | std::ofstream::app);

maybe fix your path assignment and remove the .c_str()

Code:

std::string filePath("\\\\sb33glnxa64\\stateflow\\devel\\MyLog.txt");
m_fStream.open(filePath, std::ofstream::out | std::ofstream::app);

superwavelet · 05-19-2018, 05:27 PM

Quote:

Originally Posted by BW-userx

I am not familiar with remote access but I'd venture to say you're going to have to insure you have a connection, then take that and add it to the front of your path string then try to save it.

something I just whipped up. Creates a new file, adds to it then closes it in the path to indicated in hard code.

Code:

#include <iostream>
#include <fstream>

using namespace std;

int main(int argc, char **argv)
{
    if (argc != 2)
    {
        cout<<"not enough args "<<argv<<endl;
        exit(EXIT_FAILURE);
    }
    std::string file = argv[1];
    std::string p = "/home/userx/Documents";
    p+="/";
    p += file;
    cout<<"P "<<p<<endl;
    fstream F;
    F.open( p, std::ifstream::out);
    if (F.is_open())
    {
        for (int i = 0; i < 10; i++)
        {
            F << i;
            F << endl;
        }

    }
    F.close();

    cout<<argv[1];
   return 0;
}

results

Code:

$ pwd
/media/projects/C++Projects/screwingaround/bin/Debug

./screwingaround mynewfile
P /home/userx/Documents/mynewfile
mynewfile 

$ ls ~/Documents
mynewfile

$ cat  ~/Documents/mynewfile
0
1
2
3
4
5
6
7
8
9

EDIT:

you're using a string then turning it into a char I do not know why

Code:

std::string filePath("\\\\sb33glnxa64\\stateflow\\devel\\MyLog.txt");
m_fStream.open(filePath.c_str(), std::ofstream::out | std::ofstream::app);

maybe fix your path assignment and remove the .c_str()

Code:

std::string filePath("\\\\sb33glnxa64\\stateflow\\devel\\MyLog.txt");
m_fStream.open(filePath, std::ofstream::out | std::ofstream::app);

Thank you very much!
I have the access to the machine.
Sorry, I forget to mention: the program also run on the remote linux machine under an sub folder of /stateflow/devel . But the subfolder is created during the run and I do not know the name and the exact path of the sub folder. So that's why I need to know the absolute path thus later I can find and open the MyLog.txt.

BW-userx · 05-19-2018, 06:01 PM

Quote:

Originally Posted by superwavelet

Thank you very much!
I have the access to the machine.
Sorry, I forget to mention: the program also run on the remote linux machine under an sub folder of /stateflow/devel . But the subfolder is created during the run and I do not know the name and the exact path of the sub folder. So that's why I need to know the absolute path thus later I can find and open the MyLog.txt.

I updated my code but that I do not think is an issue, maybe take a peek at it.

So, your problem is whenever you log in you get assigned a new different sub directory under the parent dir /stateflow/devel which turns into /stateflow/devel/unknowName

this is Linux yes?

Code:

#include <iostream>
/*
#include <fstream>
#include <string>
*/
#include <boost/filesystem.hpp>

int main(int argc, char **argv)
{
    boost::filesystem::path p;
    p = boost::filesystem::current_path();
    std::cout << "Current path is : " << p << std::endl;
    //remove the quotes?? maybe??
    std::string WithoutQuotes;
    WithoutQuotes = boost::filesystem::canonical(p).string();
    WithoutQuotes.erase ( remove(WithoutQuotes.begin(), WithoutQuotes.end(), '\"') ,
    WithoutQuotes.end() );

    std::cout<<"Current path  n/Quotes "<<WithoutQuotes<<std::endl;

   return 0;
}

link -lboost_system -lboost_filesystem

Code:

$ ./screwingaround
Current path is : "/media/projects/C++Projects/screwingaround/bin/Debug"
Current path  n/Quotes /media/projects/C++Projects/screwingaround/bin/Debug

superwavelet · 05-19-2018, 06:17 PM

Quote:

Originally Posted by BW-userx

I updated my code but that I do not think is an issue, maybe take a peek at it.

So, your problem is whenever you log in you get assigned a new different sub directory under the parent dir /stateflow/devel which turns into /stateflow/devel/unknowName

this is Linux yes?

Code:

#include <iostream>
/*
#include <fstream>
#include <string>
*/
#include <boost/filesystem.hpp>

int main(int argc, char **argv)
{
    boost::filesystem::path p;
    p = boost::filesystem::current_path();
    std::cout << "Current path is : " << p << std::endl;
    //remove the quotes?? maybe??
    std::string WithoutQuotes;
    WithoutQuotes = boost::filesystem::canonical(p).string();
    WithoutQuotes.erase ( remove(WithoutQuotes.begin(), WithoutQuotes.end(), '\"') ,
    WithoutQuotes.end() );

    std::cout<<"Current path  n/Quotes "<<WithoutQuotes<<std::endl;

   return 0;
}

link -lboost_system -lboost_filesystem

Code:

$ ./screwingaround
Current path is : "/media/projects/C++Projects/screwingaround/bin/Debug"
Current path  n/Quotes /media/projects/C++Projects/screwingaround/bin/Debug

Thank you. Yes, on linux. But the problem is the program will generate an .exe in a sub folder on that machine which I do not know and then run the .exe file from that subfolder. Moreover, when I ran the program, the std::cout will not print out the "current path" to the terminal. Thus, let me try our /home directory mentioned in the earlier reply.

Thanks!

BW-userx · 05-19-2018, 06:28 PM

sounds like you're going to have to dig a little deeper in how to send receive communications between remote client -> to host terminals. feedback stuff. Which I'd even have to look into.