DaniWeb Forum Index > Software Development > C++

how to get a document from root?

Please support our C++ advertiser: Intel Parallel Studio Home

Thread Solved

•

Join Date: Apr 2009

Posts: 40

Reputation: valtikz is on a distinguished road

Solved Threads: 7

valtikz

Offline

Light Poster

how to get a document from root?

Apr 24th, 2009

This is my next question: how to get a document from root?
because I have this code:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
myfile.open ("/home/ws14/Desktop/test.txt");
myfile.open ("/home/ws14/Desktop/test.txt");

But I need to change the path home/ws14 if I change user. Thanks!

•

Join Date: Apr 2008

Posts: 59

Reputation: Dannyo329 is an unknown quantity at this point

Solved Threads: 6

Dannyo329

Offline

Junior Poster in Training

Re: how to get a document from root?

Apr 24th, 2009

I don't really get what you are asking, do you mean you have the test.txt file on the desktop and the code for opening it is for a user, but you want to open the file again on another user?

C programmers will get smashed by C++ programmers.

•

Join Date: Apr 2009

Posts: 40

Reputation: valtikz is on a distinguished road

Solved Threads: 7

valtikz

Offline

Light Poster

Re: how to get a document from root?

Apr 24th, 2009

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
myfile.open ("/home/ws14/Desktop/test.txt");
myfile.open ("/home/ws14/Desktop/test.txt");

for example: /home/ws14 is my user. but if I transfer the c++ file to another user it cant open the path /home/ws14. because it is not the same user. how do I make the path general? with a folder. that you dont need to change the code for the user and another user. thanks!

•

Join Date: Apr 2008

Posts: 59

Reputation: Dannyo329 is an unknown quantity at this point

Solved Threads: 6

Dannyo329

Offline

Junior Poster in Training

Re: how to get a document from root?

Apr 24th, 2009

Why don't you just put the text file in your hard drive like D:\ or something? Then the program will work on every user on the computer.

C programmers will get smashed by C++ programmers.

•

Join Date: Apr 2009

Posts: 1

Reputation: quartzie is an unknown quantity at this point

Solved Threads: 1

quartzie

Offline

Newbie Poster

Re: how to get a document from root?

Apr 24th, 2009

on a u*x system, / is your root. /home/ws14 is a private home directory, so you probably need to place the text file into some public directory instead. if you don't care on whose desktop the file is, you can try accessing ~/Desktop/text.txt, but it will be up to the other users to ensure they have such file on their respective desktop.

•

Join Date: Oct 2006

Posts: 2,951

Reputation: niek_e has a reputation beyond repute

Solved Threads: 306

niek_e

Offline

Cenosillicaphobiac

Re: how to get a document from root?

Apr 24th, 2009

•

Originally Posted by Dannyo329

Why don't you just put the text file in your hard drive like D:\ or something? Then the program will work on every user on the computer.

Because it is Linux, so D:\ won't exist

•

Originally Posted by valtikz

Help with Code Tags

C++ Syntax (Toggle Plain Text)
myfile.open ("/home/ws14/Desktop/test.txt");
myfile.open ("/home/ws14/Desktop/test.txt");
for example: /home/ws14 is my user. but if I transfer the c++ file to another user it cant open the path /home/ws14. because it is not the same user. how do I make the path general? with a folder. that you dont need to change the code for the user and another user. thanks!

You could get the username by using popen in combination with whoami :

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include<iostream>
#include <cstdio>
using namespace std;
 
int main()
{
    char text[255];
    FILE *name;
    name = popen("whoami", "r");
    fgets(text, sizeof(text), name);
    pclose(name);
    string path = "/home/" + string(text);
    cout << path <<  "\n";
    return 0;
}
#include<iostream>
#include <cstdio>
using namespace std;

int main()
{
    char text[255];
    FILE *name;
    name = popen("whoami", "r");
    fgets(text, sizeof(text), name);
    pclose(name);
    string path = "/home/" + string(text);
    cout << path <<  "\n";
    return 0;
}

I didn't test it, but I think it should work. There's probably a better/cleaner way to do it. Perhaps use "~" in the filename?

[edit] too late...

Last edited by niek_e; Apr 24th, 2009 at 5:54 am.

•

Join Date: Jan 2009

Posts: 338

Reputation: JasonHippy is just really nice

Solved Threads: 61

JasonHippy JasonHippy is offline

Offline

Posting Whiz

Re: how to get a document from root?

Apr 24th, 2009

In windows, by including shlobj.h you can use a call to determine the path to the users desktop using the following:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
// This variable will store the path to the users desktop
LPSTR desktopPath = new CHAR(MAX_PATH);
 
// this function call will populate the variable above with the path to 
// the users desktop....
SHGetSpecialFolderPath(0, desktopPath, CSIDL_DESKTOPDIRECTORY, 0);
// This variable will store the path to the users desktop
LPSTR desktopPath = new CHAR(MAX_PATH);

// this function call will populate the variable above with the path to 
// the users desktop....
SHGetSpecialFolderPath(0, desktopPath, CSIDL_DESKTOPDIRECTORY, 0);

I've not done any programming for unix/linux (yet!), so I don't know anything about the various API's/libraries involved, but I'm sure there will be some equivalent functionality somewhere in the *nix codebase to do this. If anybody knows what it is, then that will be the most likely solution to this thread!

Hope this is in some way useful.
Cheers for now,
Jas.

There are 10 types of people in this world.....
Those who understand binary .....
And those who don't!

•

Join Date: Jan 2009

Posts: 338

Reputation: JasonHippy is just really nice

Solved Threads: 61

JasonHippy JasonHippy is offline

Offline

Posting Whiz

Re: how to get a document from root?

Apr 24th, 2009

Ah, I see niek_e snuck in there with the answer while I was writing my last post!

There are 10 types of people in this world.....
Those who understand binary .....
And those who don't!

•

Join Date: Apr 2009

Posts: 40

Reputation: valtikz is on a distinguished road

Solved Threads: 7

valtikz

Offline

Light Poster

Re: how to get a document from root?

Apr 25th, 2009

•

Originally Posted by quartzie

on a u*x system, / is your root. /home/ws14 is a private home directory, so you probably need to place the text file into some public directory instead. if you don't care on whose desktop the file is, you can try accessing ~/Desktop/text.txt, but it will be up to the other users to ensure they have such file on their respective desktop.

Yes this is a good help quartzie. But is there a posible code to auto detect the user? or a code that can create a folder on public and inside the folder is the textfile that you can read/write?.
because if you just put it in Desktop it has a posibility to delete that file even if it is hiden file .text.txt. and then the C++ code for the read is being crashed.

To ALL Thanks for the help! ^_^

•

Join Date: Apr 2009

Posts: 40

Reputation: valtikz is on a distinguished road

Solved Threads: 7

valtikz

Offline

Light Poster

Re: how to get a document from root?

#10

Apr 26th, 2009

•

Originally Posted by niek_e

Because it is Linux, so D:\ won't exist

You could get the username by using popen in combination with whoami :
Help with Code Tags

C++ Syntax (Toggle Plain Text)
#include<iostream>
#include <cstdio>
using namespace std;
 
int main()
{
    char text[255];
    FILE *name;
    name = popen("whoami", "r");
    fgets(text, sizeof(text), name);
    pclose(name);
    string path = "/home/" + string(text);
    cout << path <<  "\n";
    return 0;
}
#include<iostream> #include <cstdio> using namespace std; int main() { char text[255]; FILE *name; name = popen("whoami", "r"); fgets(text, sizeof(text), name); pclose(name); string path = "/home/" + string(text); cout << path << "\n"; return 0; }
I didn't test it, but I think it should work. There's probably a better/cleaner way to do it. Perhaps use "~" in the filename?

[edit] too late...

This is a good help! Thanks!
But how can I write a file using the string path?

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include<iostream>
#include <cstdio>
using namespace std;
 
int main()
{
    char text[255];
    FILE *name;
    name = popen("whoami", "r");
    fgets(text, sizeof(text), name);
    pclose(name);
    string path = "/home/" + string(text);
    cout << path <<  "\n";
 
    return 0;
}
#include<iostream>
#include <cstdio>
using namespace std;

int main()
{
    char text[255];
    FILE *name;
    name = popen("whoami", "r");
    fgets(text, sizeof(text), name);
    pclose(name);
    string path = "/home/" + string(text);
    cout << path <<  "\n";

    return 0;
}

I use this

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
 
    fstream myfile;
    myfile.open (path + "/.test.txt", fstream::in | fstream::out | fstream::app);
    myfile.close();
    
    fstream myfile;
    myfile.open (path + "/.test.txt", fstream::in | fstream::out | fstream::app);
    myfile.close();