As you all know, the appdata folder is this
C:\Users\*Username*\AppData\Roaming
on windows 7
Since my application will be deployed on all kinds of Windows OSes i need to be able to get the folder 100% percent of the time.
The question is how do you do it in C++? Since i don't know the the exact Windows OS it could be XP,Vista or 7 and most importantly i don't know what the Username is.
For maximum compatibility with all versions of Windows, you can use the SHGetFolderPath function.
It requires that you specify the CSIDL value for the folder whose path you want to retrieve. For the application data folder, that would be CSIDL_APPDATA.
On Windows Vista and later, you should use the SHGetKnownFolderPath function instead, which requires that you specify the folder's KNOWNFOLDERID value. Again, for the application data folder, the appropriate value is FOLDERID_RoamingAppData.
To use either of these functions from your C++ application, you'll need to include shlobj.h.
You can try the following:
char* appdata = getenv("APPDATA");
This code reads the environment variable APPDATA (you can also see it when you type SET in a command window). It is set by Windows when your system starts.
It will return the path of the user's appdata as an absolute path, including Username and taking into account whichever OS version they're using.
Perhaps fellow Googlers might find it interesting to have a look at std::filesystem. For instance, let's assume the default temp directory location and AppData directory structure in Windows 10:
#include <filesystem>
auto path = std::filesystem::temp_directory_path()
.parent_path()
.parent_path();
path /= "Roaming";
if (!std::filesystem::exists(path))
std::filesystem::create_directories(path);
In the case of OP, I am assuming this doesn't solve the problem. I do want to raise a word of caution against doing the above in a situation that requires a 100% robust implementation, as system configurations can easily change and break the above.
But perhaps new visitors to the question might find std::filesystem useful. Chances are, you're going to want to manipulate the items in the directory if you're looking for it, and for this, std::filesystem can be your friend.
If someone is looking for a simple implementation, here's mine:
#include <windows.h>
#include <shlobj.h>
#include <filesystem>
#include <iostream>
int main(void)
{
std::filesystem::path path;
PWSTR path_tmp;
/* Attempt to get user's AppData folder
*
* Microsoft Docs:
* https://learn.microsoft.com/en-us/windows/win32/api/shlobj_core/nf-shlobj_core-shgetknownfolderpath
* https://learn.microsoft.com/en-us/windows/win32/shell/knownfolderid
*/
auto get_folder_path_ret = SHGetKnownFolderPath(FOLDERID_RoamingAppData, 0, nullptr, &path_tmp);
/* Error check */
if (get_folder_path_ret != S_OK) {
CoTaskMemFree(path_tmp);
return 1;
}
/* Convert the Windows path type to a C++ path */
path = path_tmp;
/* Free memory :) */
CoTaskMemFree(path_tmp);
std::cout << path << std::endl;
return 0;
}
Use this Code to reads the environment variable "APPDATA"
Include stdio.h file in beginning
char *pValue;
size_t len;
errno_t err = _dupenv_s(&pValue, &len, "APPDATA");
Here is a simple implementation for old C++ versions :
#include <shlobj.h>
// ...
wchar_t* localAppDataFolder;
if (SHGetKnownFolderPath(FOLDERID_LocalAppData, KF_FLAG_CREATE, NULL, &localAppDataFolder) != S_OK) {
std::cerr << "problem getting appdata folder" << std::endl;
}
else std::wcout << L"folder found: " << localAppDataFolder << std::endl;
So I am trying to check if a given file exists or not. Following this answer I tried GetFileAttributesW. It works just fine for any ascii input, but it fails for ß, ü and á (and any other non-ascii character I suspect). I get ERROR_FILE_NOT_FOUND for filenames with them and ERROR_PATH_NOT_FOUND for pathnames with them, as one would expect if they didn't exists.
I made 100% sure that they did. I spend 15 minutes on copying filenames to not make typos and using literals to avoid any bad input. I couldn't find any mistake.
Since all of these characters are non-ascii characters I stopped trying, because I suspected I might have screwed up with encodings. I just can't spot it. Is there something I am missing? I link against Kernel32.lib
Thanks!
#include <stdio.h>
#include <iostream>
#include <string>
#include "Windows.h"
void main(){
while(true){
std::wstring file_path;
std::getline(std::wcin, file_path);
DWORD dwAttrib = GetFileAttributesW(file_path.data());
if(dwAttrib == INVALID_FILE_ATTRIBUTES){
printf("error: %d\n", GetLastError());
continue;
}
if(!(dwAttrib & FILE_ATTRIBUTE_DIRECTORY))
printf("valid!\n");
else
printf("invalid!\n");
}
}
It's extremely hard to make Unicode work well in a console program on Windows, so let's start by removing that aspect of it (for now).
Modify your program so that it looks like this:
#include <cstdio>
#include <iostream>
#include <string>
#include "Windows.h"
int main() {
std::wstring file_path = L"fooß.txt";
DWORD dwAttrib = GetFileAttributesW(file_path.data());
if (dwAttrib == INVALID_FILE_ATTRIBUTES)
printf("error: %d\n", GetLastError());
if (!(dwAttrib & FILE_ATTRIBUTE_DIRECTORY))
printf("valid!\n");
else
printf("invalid!\n");
return 0;
}
Make sure this file is saved with a byte-order mark (BOM), even if you're using UTF-8. Windows applications, including Visual Studio and the compilers, can be very picky about that. If your editor won't do that, use Visual Studio to edit the file and then use Save As, click the down arrow next to the Save button, choose With Encoding. In the Advanced Save Options dialog, choose "Unicode (UTF-8 with signature) - Codepage 65001".
Make sure you have a file named fooß.txt in the current folder. I strongly recommend using a GUI program to create this file, like Notepad or Explorer.
This program works. If you still get a file-not-found message, check to make sure the temporary file is in the working directory or change the program to use an absolute path. If you use an absolute path, use backslashes and make sure they are all properly escaped. Check for typos, the extension, etc. This code does work.
Now, if you take the file name from standard input:
std::wstring file_path;
std::getline(std::wcin, file_path);
And you enter fooß.txt in the console window, you'll probably find that it doesn't work. And if you look in the debugger, you'll see that the character that should be ß is something else. For me, it's á, but it might be different for you if your console codepage is something else.
ß is U+00DF in Unicode. In Windows 1252 (the most common codepage for Windows users in the U.S.), it's 0xDF, so it might seem like there's no chance of a conversion problem. But the console windows (by default) use OEM code pages. In the U.S., the common OEM codepage is 437. So when I try to type ß in the console, that's actually encoded as 0xE1. Surprise! That's the same as the Unicode value for á. And if you manage to enter a character with the value 0xDF, you'll see that corresponds to the block character you reported in the original question.
You would think (well, I would think) that asking for the input from std::wcin would do whatever conversion is necessary. But it doesn't, and there's probably some legacy backward compatibility reason for that. You could try to imbue the stream with the "proper" codepage, but that gets complicated, and I've never bothered trying to make it work. I've simply stopped trying to use anything other than ASCII on the console.
I have the python code... but how do i do it in c++?
I don't have much experience with c++. What i want is to make an exe that will be put as autorun in an cd. It has to open the application.ini file in my cd with xulrunner.exe in my cd. As the path will vary in each computer i hav to do something like this.
import subprocess
import os
path= os.getcwd()
final = path + '/xulrunner.exe ' + path + '/application.ini'
print final
os.system('final')
subprocess.call(['C:\\Temp\\a b c\\Notepad.exe'])
I'm not completely sure I understand what you're asking, but you may want the 'system' function. This will invoke the platform's command processor to execute the command given.
If all of your files (xulrunner.exe and application.ini) are in the same directory as the auto-run executable, you should be able to just rely on the working directory being correct and not need to give a full path.
For example:
system("xulrunner.exe application.ini");
os.system() is system(), in Win32 getcwd() is GetCurrentDirectory()
http://msdn.microsoft.com/en-us/library/aa364934(VS.85).aspx
Probably should stick to char buffers for strings. So, something like (untested, untried)
#include <stdio.h>
int main(int ac, char **av) {
char path[MAX_PATH+1];
GetCurrentDirectory(MAX_PATH, path);
char final[MAX_PATH * 2 + 100];
sprintf(final, "%s /xulrunner.exe %s/application.ini", path, path);
printf("%s", final);
system(final);
// not sure what the notepad call is for, probably another system call
return 0;
}
It depends on the platform you're implementing it for, but on Windows (assuming from the C:\ that's where you are), you'll need to dip into the Windows API and use CreateProcess. On Linux, it would be system or popen (not terribly familiar there).
http://msdn.microsoft.com/en-us/library/ms682425%28VS.85%29.aspx
If the EXE you're running is known to be in the current working directory (wherever your program is started from), you can simply use the filename ("xulrunner.exe") as the name. You may be safer with ".\xulrunner.exe", but that's more preference. You can also specify a subdirectory, or even SetCurrentDirectory to move to another dir.
BOOL startedProgram = CreateProcess("xulrunner.exe", "application.ini", [fill in other options as you need]);
Basically, I was hoping to sort of keep my files sorted instead of having them all in the same folder as my executable, but referencing files in sub folders relative to my executable has proven difficult.
// DEFINES
#define IMAGE_BACKGROUND "\\content\\images\\background.bmp"
#define FONT_MAIN "\\content\\fonts\\sai.ttf"
The above code obviously does not work.
I read supposedly args[0] is somehow my path? Anyone care to elaborate a little more?
int main(int argc, char* args[])
{
I should mention that Boost.Filesystem is a nice library that can help you out.
args[0] is the full path name (well, but that is also decided by the OS and shell, so you may get a short file name which is not full) to your "executable file", not its folder. you must truncate it.
try splitpath and joinpath.
args[0] is the name used to call your executable, which is not necessarily the full path of your executable. You're interested in the working directory of your executable, which is OS-dependent.
In any case, you have to be careful with relative paths. If your user calls your program from a different directory, your working directory may be something unexpected, and you won't properly reference your files.
Since you're in Windows, you can use the GetModuleFileName function (see the documentation) to get the full name of your executable, like so:
GetModuleFileName(NULL, buffer, length);
Have you tryed doing:
#define IMAGE_BACKGROUND "\content\images\background.bmp"
That might be the problem (as i have used images from sub folders like that before)
This code should work:
#define IMAGE_BACKGROUND "\\content\\images\\background.bmp"
int main(int argc, char* args[])
{
char buf[512];
int endOfPath = strrchr(args[0], '\\') - args[0];
strncpy_s(buf, sizeof(buf), args[0], endOfPath);
strcat(buf, IMAGE_BACKGROUND);
Like the other person said, args[0] is the full path of the executeble, so you can't use that as is. The strrchr function (TWO r's in the middle) finds the last occurrence of a given character and returns a pointer to it. Assuming that you are using one-byte characters, subtracting args[0] from the returned pointer will give you the number of characters between the two pointers -- When you subtract two pointers, your actually subtracting the memory addresses, so what you're left with is an offset, or distance between the pointers. This distance is like the index of the character that was found.
I then use the strncpy_s function to copy endOfPath number of characters from args[0] to our temporary buffer. Now, if your program path was
"C:\Windows\Users\Me\Desktop\myProgram\theProgram.exe"
the buf variable will contain
"C:\Windows\Users\Me\Desktop\myProgram"
I then used the strcat (conCATenation) function to append your constant onto the end.
Note that with your #define, the "\\" is REQUIRED in C/C++, and also note that the " marks will be included where ever you use IMAGE_BACKGROUND.
After those lines of code, buf will contain:
"C:\Windows\Users\Me\Desktop\myProgram\content\images\background.bmp"
Hope that helps and is not too confusing...
I actually solved it by using the following code, thank you all for the responses:
// DEFINES
#define IMAGE_BACKGROUND ".\\content\\images\\background.png"
#define IMAGE_BLUEBLOCK ".\\content\\images\\blueblock.png"
#define FONT_MAIN ".\\content\\fonts\\sai.ttf"
Turns out the . gets the "working path directory".
Is there a platform-agnostic and filesystem-agnostic method to obtain the full path of the directory from where a program is running using C/C++? Not to be confused with the current working directory. (Please don't suggest libraries unless they're standard ones like clib or STL.)
(If there's no platform/filesystem-agnostic method, suggestions that work in Windows and Linux for specific filesystems are welcome too.)
Here's code to get the full path to the executing app:
Variable declarations:
char pBuf[256];
size_t len = sizeof(pBuf);
Windows:
int bytes = GetModuleFileName(NULL, pBuf, len);
return bytes ? bytes : -1;
Linux:
int bytes = MIN(readlink("/proc/self/exe", pBuf, len), len - 1);
if(bytes >= 0)
pBuf[bytes] = '\0';
return bytes;
If you fetch the current directory when your program first starts, then you effectively have the directory your program was started from. Store the value in a variable and refer to it later in your program. This is distinct from the directory that holds the current executable program file. It isn't necessarily the same directory; if someone runs the program from a command prompt, then the program is being run from the command prompt's current working directory even though the program file lives elsewhere.
getcwd is a POSIX function and supported out of the box by all POSIX compliant platforms. You would not have to do anything special (apart from incliding the right headers unistd.h on Unix and direct.h on windows).
Since you are creating a C program it will link with the default c run time library which is linked to by ALL processes in the system (specially crafted exceptions avoided) and it will include this function by default. The CRT is never considered an external library because that provides the basic standard compliant interface to the OS.
On windows getcwd function has been deprecated in favour of _getcwd. I think you could use it in this fashion.
#include <stdio.h> /* defines FILENAME_MAX */
#ifdef WINDOWS
#include <direct.h>
#define GetCurrentDir _getcwd
#else
#include <unistd.h>
#define GetCurrentDir getcwd
#endif
char cCurrentPath[FILENAME_MAX];
if (!GetCurrentDir(cCurrentPath, sizeof(cCurrentPath)))
{
return errno;
}
cCurrentPath[sizeof(cCurrentPath) - 1] = '\0'; /* not really required */
printf ("The current working directory is %s", cCurrentPath);
This is from the cplusplus forum
On windows:
#include <string>
#include <windows.h>
std::string getexepath()
{
char result[ MAX_PATH ];
return std::string( result, GetModuleFileName( NULL, result, MAX_PATH ) );
}
On Linux:
#include <string>
#include <limits.h>
#include <unistd.h>
std::string getexepath()
{
char result[ PATH_MAX ];
ssize_t count = readlink( "/proc/self/exe", result, PATH_MAX );
return std::string( result, (count > 0) ? count : 0 );
}
On HP-UX:
#include <string>
#include <limits.h>
#define _PSTAT64
#include <sys/pstat.h>
#include <sys/types.h>
#include <unistd.h>
std::string getexepath()
{
char result[ PATH_MAX ];
struct pst_status ps;
if (pstat_getproc( &ps, sizeof( ps ), 0, getpid() ) < 0)
return std::string();
if (pstat_getpathname( result, PATH_MAX, &ps.pst_fid_text ) < 0)
return std::string();
return std::string( result );
}
If you want a standard way without libraries: No. The whole concept of a directory is not included in the standard.
If you agree that some (portable) dependency on a near-standard lib is okay: Use Boost's filesystem library and ask for the initial_path().
IMHO that's as close as you can get, with good karma (Boost is a well-established high quality set of libraries)
I know it is very late at the day to throw an answer at this one but I found that none of the answers were as useful to me as my own solution. A very simple way to get the path from your CWD to your bin folder is like this:
int main(int argc, char* argv[])
{
std::string argv_str(argv[0]);
std::string base = argv_str.substr(0, argv_str.find_last_of("/"));
}
You can now just use this as a base for your relative path. So for example I have this directory structure:
main
----> test
----> src
----> bin
and I want to compile my source code to bin and write a log to test I can just add this line to my code.
std::string pathToWrite = base + "/../test/test.log";
I have tried this approach on Linux using full path, alias etc. and it works just fine.
NOTE:
If you are on windows you should use a '\' as the file separator not '/'. You will have to escape this too for example:
std::string base = argv[0].substr(0, argv[0].find_last_of("\\"));
I think this should work but haven't tested, so comment would be appreciated if it works or a fix if not.
Filesystem TS is now a standard ( and supported by gcc 5.3+ and clang 3.9+ ), so you can use current_path() function from it:
std::string path = std::experimental::filesystem::current_path();
In gcc (5.3+) to include Filesystem you need to use:
#include <experimental/filesystem>
and link your code with -lstdc++fs flag.
If you want to use Filesystem with Microsoft Visual Studio, then read this.
No, there's no standard way. I believe that the C/C++ standards don't even consider the existence of directories (or other file system organizations).
On Windows the GetModuleFileName() will return the full path to the executable file of the current process when the hModule parameter is set to NULL. I can't help with Linux.
Also you should clarify whether you want the current directory or the directory that the program image/executable resides. As it stands your question is a little ambiguous on this point.
On Windows the simplest way is to use the _get_pgmptr function in stdlib.h to get a pointer to a string which represents the absolute path to the executable, including the executables name.
char* path;
_get_pgmptr(&path);
printf(path); // Example output: C:/Projects/Hello/World.exe
Maybe concatenate the current working directory with argv[0]? I'm not sure if that would work in Windows but it works in linux.
For example:
#include <stdio.h>
#include <unistd.h>
#include <string.h>
int main(int argc, char **argv) {
char the_path[256];
getcwd(the_path, 255);
strcat(the_path, "/");
strcat(the_path, argv[0]);
printf("%s\n", the_path);
return 0;
}
When run, it outputs:
jeremy#jeremy-desktop:~/Desktop$ ./test
/home/jeremy/Desktop/./test
For Win32 GetCurrentDirectory should do the trick.
You can not use argv[0] for that purpose, usually it does contain full path to the executable, but not nessesarily - process could be created with arbitrary value in the field.
Also mind you, the current directory and the directory with the executable are two different things, so getcwd() won't help you either.
On Windows use GetModuleFileName(), on Linux read /dev/proc/procID/.. files.
Just my two cents, but doesn't the following code portably work in C++17?
#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
int main(int argc, char* argv[])
{
std::cout << "Path is " << fs::path(argv[0]).parent_path() << '\n';
}
Seems to work for me on Linux at least.
Based on the previous idea, I now have:
std::filesystem::path prepend_exe_path(const std::string& filename, const std::string& exe_path = "");
With implementation:
fs::path prepend_exe_path(const std::string& filename, const std::string& exe_path)
{
static auto exe_parent_path = fs::path(exe_path).parent_path();
return exe_parent_path / filename;
}
And initialization trick in main():
(void) prepend_exe_path("", argv[0]);
Thanks #Sam Redway for the argv[0] idea. And of course, I understand that C++17 was not around for many years when the OP asked the question.
Just to belatedly pile on here,...
there is no standard solution, because the languages are agnostic of underlying file systems, so as others have said, the concept of a directory based file system is outside the scope of the c / c++ languages.
on top of that, you want not the current working directory, but the directory the program is running in, which must take into account how the program got to where it is - ie was it spawned as a new process via a fork, etc. To get the directory a program is running in, as the solutions have demonstrated, requires that you get that information from the process control structures of the operating system in question, which is the only authority on this question. Thus, by definition, its an OS specific solution.
#include <windows.h>
using namespace std;
// The directory path returned by native GetCurrentDirectory() no end backslash
string getCurrentDirectoryOnWindows()
{
const unsigned long maxDir = 260;
char currentDir[maxDir];
GetCurrentDirectory(maxDir, currentDir);
return string(currentDir);
}
For Windows system at console you can use system(dir) command. And console gives you information about directory and etc. Read about the dir command at cmd. But for Unix-like systems, I don't know... If this command is run, read bash command. ls does not display directory...
Example:
int main()
{
system("dir");
system("pause"); //this wait for Enter-key-press;
return 0;
}
Works with starting from C++11, using experimental filesystem, and C++14-C++17 as well using official filesystem.
application.h:
#pragma once
//
// https://en.cppreference.com/w/User:D41D8CD98F/feature_testing_macros
//
#ifdef __cpp_lib_filesystem
#include <filesystem>
#else
#include <experimental/filesystem>
namespace std {
namespace filesystem = experimental::filesystem;
}
#endif
std::filesystem::path getexepath();
application.cpp:
#include "application.h"
#ifdef _WIN32
#include <windows.h> //GetModuleFileNameW
#else
#include <limits.h>
#include <unistd.h> //readlink
#endif
std::filesystem::path getexepath()
{
#ifdef _WIN32
wchar_t path[MAX_PATH] = { 0 };
GetModuleFileNameW(NULL, path, MAX_PATH);
return path;
#else
char result[PATH_MAX];
ssize_t count = readlink("/proc/self/exe", result, PATH_MAX);
return std::string(result, (count > 0) ? count : 0);
#endif
}
For relative paths, here's what I did. I am aware of the age of this question, I simply want to contribute a simpler answer that works in the majority of cases:
Say you have a path like this:
"path/to/file/folder"
For some reason, Linux-built executables made in eclipse work fine with this. However, windows gets very confused if given a path like this to work with!
As stated above there are several ways to get the current path to the executable, but the easiest way I find works a charm in the majority of cases is appending this to the FRONT of your path:
"./path/to/file/folder"
Just adding "./" should get you sorted! :) Then you can start loading from whatever directory you wish, so long as it is with the executable itself.
EDIT: This won't work if you try to launch the executable from code::blocks if that's the development environment being used, as for some reason, code::blocks doesn't load stuff right... :D
EDIT2: Some new things I have found is that if you specify a static path like this one in your code (Assuming Example.data is something you need to load):
"resources/Example.data"
If you then launch your app from the actual directory (or in Windows, you make a shortcut, and set the working dir to your app dir) then it will work like that.
Keep this in mind when debugging issues related to missing resource/file paths. (Especially in IDEs that set the wrong working dir when launching a build exe from the IDE)
A library solution (although I know this was not asked for).
If you happen to use Qt:
QCoreApplication::applicationDirPath()
Path to the current .exe
#include <Windows.h>
std::wstring getexepathW()
{
wchar_t result[MAX_PATH];
return std::wstring(result, GetModuleFileNameW(NULL, result, MAX_PATH));
}
std::wcout << getexepathW() << std::endl;
// -------- OR --------
std::string getexepathA()
{
char result[MAX_PATH];
return std::string(result, GetModuleFileNameA(NULL, result, MAX_PATH));
}
std::cout << getexepathA() << std::endl;
This question was asked 15 years ago, so the existing answers are now incorrect. If you're using C++17 or greater, the solution is very straightforward today:
#include <filesystem>
std::cout << std::filesystem::current_path();
See cppreference.com for more information.
On POSIX platforms, you can use getcwd().
On Windows, you may use _getcwd(), as use of getcwd() has been deprecated.
For standard libraries, if Boost were standard enough for you, I would have suggested Boost::filesystem, but they seem to have removed path normalization from the proposal. You may have to wait until TR2 becomes readily available for a fully standard solution.
Boost Filesystem's initial_path() behaves like POSIX's getcwd(), and neither does what you want by itself, but appending argv[0] to either of them should do it.
You may note that the result is not always pretty--you may get things like /foo/bar/../../baz/a.out or /foo/bar//baz/a.out, but I believe that it always results in a valid path which names the executable (note that consecutive slashes in a path are collapsed to one).
I previously wrote a solution using envp (the third argument to main() which worked on Linux but didn't seem workable on Windows, so I'm essentially recommending the same solution as someone else did previously, but with the additional explanation of why it is actually correct even if the results are not pretty.
As Minok mentioned, there is no such functionality specified ini C standard or C++ standard. This is considered to be purely OS-specific feature and it is specified in POSIX standard, for example.
Thorsten79 has given good suggestion, it is Boost.Filesystem library. However, it may be inconvenient in case you don't want to have any link-time dependencies in binary form for your program.
A good alternative I would recommend is collection of 100% headers-only STLSoft C++ Libraries Matthew Wilson (author of must-read books about C++). There is portable facade PlatformSTL gives access to system-specific API: WinSTL for Windows and UnixSTL on Unix, so it is portable solution. All the system-specific elements are specified with use of traits and policies, so it is extensible framework. There is filesystem library provided, of course.
The linux bash command
which progname will report a path to program.
Even if one could issue the which command from within your program and direct the output to a tmp file and the program
subsequently reads that tmp file, it will not tell you if that program is the one executing. It only tells you where a program having that name is located.
What is required is to obtain your process id number, and to parse out the path to the name
In my program I want to know if the program was
executed from the user's bin directory or from another in the path
or from /usr/bin. /usr/bin would contain the supported version.
My feeling is that in Linux there is the one solution that is portable.
Use realpath() in stdlib.h like this:
char *working_dir_path = realpath(".", NULL);
The following worked well for me on macOS 10.15.7
brew install boost
main.cpp
#include <iostream>
#include <boost/filesystem.hpp>
int main(int argc, char* argv[]){
boost::filesystem::path p{argv[0]};
p = absolute(p).parent_path();
std::cout << p << std::endl;
return 0;
}
Compiling
g++ -Wall -std=c++11 -l boost_filesystem main.cpp