write to file

angelboy · March 10th, 2007, 01:57 PM

hi expert
i used System.IO.StreamWriter in my application to create a file,

i creat my favorite file and i write my data in it,

my problem is that any user by any permision on windows whos open my created file by notPade , my data shows to him(her),

i want to imposible read and write to my file exept by my application

please help me
best refagrds

JanWillemKL · March 24th, 2007, 06:58 AM

Take a look at this method:

using System.Security.AccessControl;
using System.IO;

Private void ProtectFile(string FileName, bool Protect)
{

FileSecurity fileSecurity = new FileSecurity();

If (Protect == true)
{
fileSecurity.SetAccessRuleProtection(true,true);
}
Else if (Protect == false)
{
fileSecurity.SetAccessRuleProtection(false,false);
}

FileInfo fileInfo = new FileInfo(FileName);

fileInfo.SetAccessControl(fileSecurity);

}

angelboy · March 24th, 2007, 02:07 PM

great apperciation dear JanWillemKL
i have a question
is it possible to cancle this protect by users on windows?
in fact i want to know is this a best good to protect file(s)?

thank again

JanWillemKL · March 24th, 2007, 06:22 PM

It's possible the same way you do. They can write their own application. But this method in combination with encoding doesn't make it easy to read!

joefawcett · March 25th, 2007, 05:01 AM

You can also simplify the code somewhat:

Code:

private void ProtectFile(string fileName, bool protect)
{
  FileSecurity fileSecurity = new FileSecurity();
  fileSecurity.SetAccessRuleProtection(protect, protect);
  FileInfo fileInfo = new FileInfo(fileName);            
  fileInfo.SetAccessControl(fileSecurity);
}

--

Joe (Microsoft MVP - XML)