設置C++文件夾中所有文件的權限

Question

是否有跨平臺的方式遞歸設置C++文件夾內容的權限？

我不想依賴系統調用。

Answer 1

實施例用C++ 17及其std::filesystem授予0777到目錄中的所有文件和文件夾：

• std::filesystem::recursive_directory_iterator()迭代 通過目錄
• std::filesystem::permissions設置權限的每個文件
• std::filesystem::perms來決定，其權限應設置

代碼：

#include <exception> 
//#include <filesystem> 
#include <experimental/filesystem> // Use this for most compilers as of yet. 

//namespace fs = std::filesystem; 
namespace fs = std::experimental::filesystem; // Use this for most compilers as of yet. 

int main() 
{ 
    fs::path directory = "change/permission/of/descendants"; 
    for (auto& path : fs::recursive_directory_iterator(directory)) 
    { 
     try { 
      fs::permissions(path, fs::perms::all); // Uses fs::perm_options::replace. 
     } 
     catch (std::exception& e) { 
      // Handle exception or use another overload of fs::permissions() 
      // with std::error_code. 
     }   
    } 
} 

---

如果如fs::perm_options::add而不是fs::perm_options::replace是需要的，那麼這還不是跨平臺的。而VS17的experimental/filesystem不知道fs::perm_options，並且包括add和remove作爲fs::perms::add_perms和fs::perms::remove_perms。這意味着的std::filesystem::permissions簽名是稍有不同：

標準：

fs::permissions(path, fs::perms::all, fs::perm_options::add); 

VS17：

fs::permissions(path, fs::perms::add_perms | fs::perms::all); // VS17.