get_file_system_infos() [1/2]

std::vector< xtd::sptr< xtd::io::file_system_info > > xtd::io::directory_info::get_file_system_infos

(

)

const

Returns an array of strongly typed xtd::io::file_system_info entries representing all the files and subdirectories in a directory.

Returns

An array of strongly typed xtd::io::file_system_info entries.

Exceptions

xtd::io::directory_not_found_exception	The specified path is invalid, such as being on an unmapped drive.
xtd::security::security_exception	The caller does not have code access permission to create the directory.

Examples

The following example counts the files and directories under the specified directory.

#include <xtd/xtd>
 
using namespace xtd;
using namespace xtd::io;
 
class program {
public:
  static auto main() {
    try {
      console::write_line("Enter the path to a directory:");
 
      string directory = console::read_line();
 
      // Create a new directory_info object.
      directory_info dir(directory);
 
      if (!dir.exists()) {
        throw directory_not_found_exception("The directory does not exist.", csf_);
      }
 
      // Call the GetFileSystemInfos method.
      std::vector<xtd::sptr<file_system_info>> infos = dir.get_file_system_infos();
 
      console::write_line("Working...");
 
      // Pass the result to the list_directories_and_files
      // method defined below.
      list_directories_and_files(infos);
 
      // Display the results to the console.
      console::write_line("Directories: {0}", directories);
      console::write_line("Files: {0}", files);
    } catch (const exception& e) {
      console::write_line(e.message());
    }
  }
 
private:
  static void list_directories_and_files(std::vector<xtd::sptr<file_system_info>> fs_info) {
    // Iterate through each item.
    for (xtd::sptr<file_system_info> i : fs_info) {
      // Check to see if this is a directory_info object.
      if (is<directory_info>(i)) {
        // Add one to the directory count.
        directories++;
 
        // Cast the object to a directory_info object.
        xtd::sptr<directory_info> d_info = as<directory_info>(i);
 
        // Iterate through all sub-directories.
        list_directories_and_files(d_info->get_file_system_infos());
      }
      // Check to see if this is a FileInfo object.
      else if (is<file_info>(i)) {
        // Add one to the file count.
        files++;
      }
    }
  }
 
  inline static long files = 0;
  inline static long directories = 0;
};
 
startup_(program::main);

Remarks

The xtd::io::directory_info::enumerate_file_system_infos and xtd::io::directory_info::get_file_system_infos methods differ as follows:

• When you use xtd::io::directory_info::enumerate_file_system_infos, you can start enumerating the collection of xtd::io::file_system_info objects before the whole collection is returned.
• When you use xtd::io::directory_info::get_file_system_infos, you must wait for the whole array of xtd::io::file_system_info objects to be returned before you can access the array.

Therefore, when you are working with many files and directories, xtd::io::directory_info::enumerate_file_system_infos can be more efficient.

This method pre-populates the values of the following xtd::io::file_system_info properties:

• xtd::io::file_system_info::attributes
• xtd::io::file_system_info::creation_time
• xtd::io::file_system_info::last_access_time
• xtd::io::file_system_info::last_write_time
• xtd::io::file_system_info::size