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Recipe 10.10. Creating a Directory
Problem
You have to create a directory, and you want to do it portably, i.e., without using OS-specific APIs.
Solution
On most platforms, you will be able to use the mkdir system call that is shipped with most compilers as
part of the C headers. It takes on different forms in different OSs, but regardless, you can use it to create
a new directory. There is no standard C++, portable way to create a directory. Check out Example
10-15
to see how.
Example 10-15. Creating a directory
#include <iostream>
#include <direct.h>
int main(int argc, char** argv) {
if (argc < 2) {
std::cerr << "Usage: " << argv[0] << " [new dir name]\n";
return(EXIT_FAILURE);
}
if (mkdir(argv[1]) == -1) {  // Create the directory
std::cerr << "Error: " << strerror(errno);
return(EXIT_FAILURE);
}
}
Discussion
The system call for creating directories differs somewhat from one OS to another, but don't let that stop
you from using it anyway. Variations of mkdir are supported on most systems, so creating a directory is
just a matter of knowing which header to include and what the function's signature looks like.
Example 10-15
works on Windows, but not Unix. On Windows, mkdir is declared in <direct.h>. It
takes one parameter (the directory name), returns -1 if there is an error, and sets errno to the
corresponding error number. You can get the implementation-defined error text by calling strerror or
perror.
On Unix, mkdir is declared in <sys/stat.h>, and its signature is slightly different. The error semantics are
just like Windows, but there is a second parameter that specifies the permissions to apply to the new
directory. Instead, you must specify the permissions using the traditional chmod format (see the chmod
man page for specifics), e.g., 0777 means owner, group, and others all have read, write, and execute
permissions. Thus, you might call it like this on Unix:
#include <iostream>
#include <sys/types.h>
#include <sys/stat.h>
int main(int argc, char** argv) {
if (argc < 2) {
std::cerr << "Usage: " << argv[0] << " [new dir name]\n";
return(EXIT_FAILURE);
}
if (mkdir(argv[1], 0777) == -1) {  // Create the directory
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Recipe 10.11. Removing a Directory
Problem
You need to remove a directory, and you want to do it portably, i.e., without using OS-specific APIs.
Solution
On most platforms, you will be able to use the rmdir system call that is shipped with most compilers as
part of the C headers. There is no standard C++, portable way to remove a directory. rmdir takes on
different forms in different OSs, but regardless, you can use it to remove a directory. See Example 10-17
for a short program that removes a directory.
Example 10-17. Removing a directory
#include <iostream>
#include <direct.h>
using namespace std;
int main(int argc, char** argv) {
if (argc < 2) {
cerr << "Usage: " << argv[0] << " [dir name]" << endl;
return(EXIT_FAILURE);
}
if (rmdir(argv[1]) == -1) {  // Remove the directory
cerr << "Error: " << strerror(errno) << endl;;
return(EXIT_FAILURE);
}
}
Discussion
The signature of rmdir is the same on most OSs, but the header file where it is declared is not. On
Windows, it is declared in <direct.h>, and on Unix, it is declared in <unistd.h>. It takes one parameter
(the directory name), returns -1 if there is an error, and sets errno to the corresponding error number.
You can get the implementation-defined error text by calling strerror or perror.
If the target directory is not empty rmdir will return an error. To list the contents of a directory, to
enumerate them for deletion, etc., see Recipe 10.12
.
If you want portability, and don't want to write a bunch of #ifdefs around the various OS-specific
directory functions, you should consider using the Boost Filesystem library. The Boost Filesystem library
uses the concept of a path to refer to a directory or file, and paths can be removed with a single function,
remove.
The function removeRecurse in Example 10-18
recursively removes a directory and all of its contents.
The most important part is the remove function (which is boost::filesystem::remove, not a standard library
function). It takes a path argument, and removes it if it is a file or an empty directory, but it doesn't
remove a directory that contains files.
Example 10-18. Removing a directory with Boost
#include <iostream>
#include <string>
#include <cstdlib>
#include <boost/filesystem/operations.hpp>
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Recipe 10.12. Reading the Contents of a Directory
Problem
You need to read the contents of a directory, most likely to do something to each file or subdirectory
that's in it.
Solution
To write something portable, use the Boost Filesystem library's classes and functions. It provides a
number of handy utilities for manipulating files, such as a portable path representation, directory iterators,
and numerous functions for renaming, deleting, and copying files, and so on. Example 10-19
demonstrates how to use a few of these facilities.
Example 10-19. Reading a directory
#include <iostream>
#include <boost/filesystem/operations.hpp>
#include <boost/filesystem/fstream.hpp>
using namespace boost::filesystem;
int main(int argc, char** argv) {
if (argc < 2) {
std::cerr << "Usage: " << argv[0] << " [dir name]\n";
return(EXIT_FAILURE);
}
path fullPath =    // Create the full, absolute path name
system_complete(path(argv[1], native));
if (!exists(fullPath)) {
std::cerr << "Error: the directory " << fullPath.string( )
<< " does not exist.\n";
return(EXIT_FAILURE);
}
if (!is_directory(fullPath)) {
std::cout << fullPath.string( ) << " is not a directory!\n";
return(EXIT_SUCCESS);
}
directory_iterator end;
for (directory_iterator it(fullPath);
it != end; ++it) {               // Iterate through each
// element in the dir,
std::cout << it->leaf( );           // almost as you would
if (is_directory(*it))             // an STL container
std::cout << " (dir)";
std::cout << '\n';
}
return(EXIT_SUCCESS);
}
Discussion
Like creating or deleting directories (see Recipe 10.10
and Recipe 10.11
), there is no standard,
portable way to read the contents of a directory. To make your C++ life easier, the Filesystem library in
the Boost project provides a set of portable routines for operating on files and directories. It also
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