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Question

Windowsマシン（Windows 7を実行中、x86-64）でsystem32/drivers/etcにある 'etc/hosts'ファイルを開き、それを修正してrubyからセーブすることができます？

私は「（例外IOError）を作成するための開かれていません」を取得エラー コードは非常に簡単です

 
file = File.open("C:/Windows/System32/drivers/etc/hosts") 
file << "new line" 

Answer 1

Instead of trying to acquire privileges from code (which maybe won't be portable across different windows OS'es), do like this:

• open a command prompt as an administrator
• run your script from there

By doing like this, all the programs you're executing will have administrative privileges as well.

EDIT: This is your problem:

file = File.open("C:/Windows/System32/drivers/etc/hosts","w") 
file << "new line" 

You have to open the file in write mode.

Answer 2

My best work around is have ruby open an elevated command prompt when necessary. It will prompt the user for a password, but it is better than nothing.

username = `whoami`.chomp 
run = "runas /noprofile /user:#{username} \"cmd /C#{cmd}\"" 
system(run) 

cmdはあなたが権限で実行したい任意のコマンドすることができます。ホストファイルを編集するには、

hosts_path = 'C:\windows\System32\drivers\etc\hosts' 
hosts_file = File.open(host_path,'r') {|f| f.read} 
... 
    --edit the hosts_file here-- 
... 
cmd = "echo \"#{hosts_file}\" > #{hosts_path}"