is_read_only() [2/2]

void xtd::io::file_info::is_read_only

(

bool

value

)

Sets a value that determines if the current file is read only.

Parameters

value

true if the current file is read only; otherwise, false.

Exceptions

xtd::io::file_not_found_exception	The file described by the current xtd::io::file_info object could not be found.
xtd::io::io_exception	An I/O error occurred while opening the file.
xtd::unauthorized_access_exception	This operation is not supported on the current platform. -or- The caller does not have the required permission.
xtd::argument_exception	The user does not have write permission, but attempted to set this property to false.

Examples

The following example uses the xtd::io::file_info::is_read_only property to mark a file as read only and then mark it as read-write.

#include <xtd/xtd>
 
using namespace xtd;
using namespace xtd::io;
 
class program {
public:
  static auto main() {
    string file_name = R"(c:\test.xml)";
 
    // Get the read-only value for a file.
    bool is_read_only = is_file_read_only(file_name);
 
    // Display wether the file is read-only.
    console::write_line("The file read-only value for " + file_name + " is: " + is_read_only);
 
    console::write_line("Changing the read-only value for " + file_name + " to true.");
 
    // Set the file to read-only.
    set_file_read_access(file_name, true);
 
    // Get the read-only value for a file.
    is_read_only = is_file_read_only(file_name);
 
    // Display that the file is read-only.
    console::write_line("The file read-only value for " + file_name + " is: " + is_read_only);
  }
 
  // Sets the read-only value of a file.
  static void set_file_read_access(const string& file_name, bool set_read_only) {
    // Create a new xtd::io::file_info object.
    file_info f_info(file_name);
 
    // Set the IsReadOnly property.
    f_info.is_read_only(set_read_only);
  }
 
  // Returns wether a file is read-only.
  static bool is_file_read_only(const string& file_name) {
    // Create a new xtd::io::file_info object.
    file_info f_info(file_name);
 
    // Return the IsReadOnly property value.
    return f_info.is_read_only();
  }
};
 
startup_(program::main);
 
 
// This code produces output similar to the following;
// results may vary based on the computer/file structure/etc.:
//
// The file read-only value for c:\test.xml is: True
// Changing the read-only value for c:\test.xml to true.
// The file read-only value for c:\test.xml is: True

Remarks

Use the xtd::io::file_info::is_read_only property to quickly determine or change whether the current file is read only.

When first called, file_info calls xtd::io::file_info::refresh and caches information about the file. On subsequent calls, you must call xtd::io::file_info::refresh to get the latest copy of the information.