length()

size_t xtd::io::file_info::length

(

)

const

Gets the size, in bytes, of the current file.

Returns

The size of the current file in bytes.

Exceptions

xtd::io::io_exception	xtd::io::file_info::refresh cannot update the state of the file or directory.
xtd::io::file_not_found_exception	The file does not exist. -or- The xtd::io::file_info::size property is called for a directory.

Examples

#include <xtd/xtd>
 
using namespace xtd;
using namespace xtd::collections::generic;
using namespace xtd::io;
 
auto main() -> int {
  // Make a reference to a directory.
  directory_info di("c:\\");
  // Get a reference to each file in that directory.
  lidt<file_info> fi_arr = di.get_files();
  // Display the names and sizes of the files.
  console::write_line("The directory {0} contains the following files:", di.name());
  for (file_info f : fi_arr)
    console::write_line("The size of {0} is {1} bytes.", f.name(), f.length());
}
 
// This code produces the following to the following;
// results may vary based on the computer/file structure/etc.:
//
// The directory c:\ contains the following files:
// The size of MyComputer.log is 274 bytes.
// The size of AUTOEXEC.BAT is 0 bytes.
// The size of boot.ini is 211 bytes.
// The size of CONFIG.SYS is 0 bytes.
// The size of hiberfil.sys is 1072775168 bytes.
// The size of IO.SYS is 0 bytes.
// The size of MASK.txt is 2700 bytes.
// The size of mfc80.dll is 1093632 bytes.
// The size of mfc80u.dll is 1079808 bytes.
// The size of MSDOS.SYS is 0 bytes.
// The size of NTDETECT.COM is 47564 bytes.
// The size of ntldr is 250032 bytes.
// The size of pagefile.sys is 1610612736 bytes.
// The size of UpdatePatch.log is 22778 bytes.
// The size of UpdatePatch.txt is 30 bytes.
// The size of wt3d.ini is 234 bytes.

Remarks

The value of the Length property is pre-cached if the current instance of the xtd::io::file_info object was returned from any of the following DirectoryInfo methods:

• xtd::io::file_info::get_directories
• xtd::io::file_info::_det_files
• xtd::io::file_info::get_file_system_infos
• xtd::io::file_info::enumerate_directories
• xtd::io::file_info::enumerate_files
• xtd::io::file_info::enumerate_file_system_infos
• To get the latest value, call the xtd::io::file_info::refresh method.

Examples

file_info2.cpp.