我正在开发一个项目,用于创建当前目录中的文件数据库。我想要的关于我的文件的一个细节是在ubuntu中使用chmod设置的文件权限。 (只是一个注释:我也需要群组和所有者信息 - 就像chown-如果你能告诉我,如果提升可以检索所有权信息,那就太棒了。)
我正在使用boost文件系统库,我已多次检查文档但无法找到如何获取权限。
In this page它显示enum perms
具有文件权限字符串,这些字符串不会显示在我自己的filesystem.hpp上。 (我已经检查过我有1.49版本,也是从源代码构建的,以确保)。另外on the same page here它表明它可以获得如下权限:
perms permissions() const noexcept;
//Returns: The value of
//permissions() specified by the postconditions of the most recent call
//to a constructor, operator=, or permissions(perms) function.
我无法找到权限功能,也无法找到存储权限列表的位置。
这是我到目前为止的代码(实际上来自boost教程,但我将其修改为递归),如果你能告诉我如何获取文件权限/所有权或建议另一个库而不是提升我会很感激它
编辑:我已经添加了s.permissions(),因为ethan_liou建议输出不是预期的。这是更新的代码和输出。
// filesystem tut4.cpp ---------------------------------------------------------------//
// Copyright Beman Dawes 2009
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
// Library home page: http://www.boost.org/libs/filesystem
#include <iostream>
#include <iterator>
#include <vector>
#include <algorithm>
#include <boost/filesystem.hpp>
#include <stdio.h>
using namespace std;
using namespace boost::filesystem;
int read(path p);
int main(int argc, char* argv[])
{
if (argc < 2)
{
cout << "Usage: tut4 path\n";
return 1;
}
path p (argv[1]); // p reads clearer than argv[1] in the following code
read(p);
return 0;
}
int read(path p) {
try
{
if (exists(p)) // does p actually exist?
{
if (is_symlink(p)) {
cout << p << " is a link\n";
}
else if (is_regular_file(p)) {
// is p a regular file?
file_status s = status(p);
cout << p << " size is " << file_size(p) << " perms " << "" ;
printf("%o\n",s.permissions());
}
else if (is_directory(p)) // is p a directory?
{
cout << p << " is a directory containing:\n";
typedef vector<path> vec; // store paths,
vec v; // so we can sort them later
copy(directory_iterator(p), directory_iterator(), back_inserter(v));
sort(v.begin(), v.end()); // sort, since directory iteration
// is not ordered on some file systems
for (vec::const_iterator it(v.begin()), it_end(v.end()); it != it_end; ++it)
{
//cout << " " << *it << '\n';
read(*it);
}
}
else
cout << p << " exists, but is neither a regular file nor a directory\n";
}
else
cout << p << " does not exist\n";
}
catch (const filesystem_error& ex)
{
cout << ex.what() << '\n';
}
return 0;
}
输出:
$ ./a.out ~/Desktop/test
"/home/usr/Desktop/test" is a directory containing:
"/home/usr/Desktop/test/a.out" size is 69446 perms 27746424350
"/home/usr/Desktop/test/la" is a directory containing:
"/home/usr/Desktop/test/la/Untitled Document" size is 0 perms 27746424170
"/home/usr/Desktop/test/la/lala" is a directory containing:
"/home/usr/Desktop/test/la/lala/Link to lalalala" is a link
"/home/usr/Desktop/test/la/lala/Untitled Folder" is a directory containing:
"/home/usr/Desktop/test/la/lala/lalalala" size is 0 perms 0
"/home/usr/Desktop/test/test.cpp" size is 2234 perms 0
"/home/usr/Desktop/test/test.cpp~" size is 2234 perms 0
注意:每次执行程序时,27746424350
之类的数字都会改变。
答案 0 :(得分:7)
perms permissions() const { return m_perms; }
在boost/filesystem/v3/operations.hpp
中定义添加简单的示例代码
#include <boost/filesystem.hpp>
#include <stdio.h>
namespace fs=boost::filesystem;
int main(int argc,char * argv[]){
fs::path p(argv[1]);
fs::file_status s = status(p);
printf("%o\n",s.permissions());
}
答案 1 :(得分:-3)
Windows的文件权限示例:
unsigned long attributes = ::GetFileAttributes( filePath.file_string().c_str());
if ( attributes != 0xFFFFFFFF && ( attributes & FILE_ATTRIBUTE_READONLY ))
{
attributes &= ~FILE_ATTRIBUTE_READONLY;
::SetFileAttributes( filePath.file_string().c_str(), attributes );
}