A exception is raised on using username and password for System.Diagnostics.Process

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An exception of type logon failure:unknown username or bad password is raised if I use username and password for System.Diagnostics.Process using

C#

static void Main(string[] args)
        {
            Process p=new Process();
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.FileName = @"D:\2011 HOLIDAYS.pdf";
            p.StartInfo.UserName = "hello";
            SecureString ss = new SecureString();
            foreach (char c in "hello")
                ss.AppendChar(c);
            p.StartInfo.Password = ss;
            p.Start();//here exception is raised;
        }

Posted 29-Mar-11 20:16pm

myes

Updated 29-Mar-11 21:00pm

v3

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Sandeep Mewara 30-Mar-11 2:22am

Use PRE tags to format code part. It makes the question readable.

2 solutions

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OriginalGriff · Answer 1 · 2011-03-29T22:34:00

Solution 2

I think you have the wrong idea about the UserName and Password feature of Process.StartInfo: they do not relate to the PDF file - they cause the process to be run logged in as a different user. So, unless you have a user on your machine called "hello" with a login password of "hello", this isn't going to work. You also need to specify the domain to log the user into - see MSDN[^] for info.

If you are trying to open a password protected PDF, then there is likely to be a command line option to specify that when you start the process, but that will depend on the reader being used.

Posted 29-Mar-11 22:34pm

OriginalGriff

Comments

Sergey Alexandrovich Kryukov 30-Mar-11 4:37am

You're absolutely right; I added it in my answer (under [EDIT]) only later, when I noticed it is not executable file. My 5.
--SA

myes 30-Mar-11 4:59am

This code is added just to illustrate the exception not to open the password protected pdf's.the same exception getting arised in my code which they have used password,username.hence just tried a small code with pdf and not to open password protected

OriginalGriff 30-Mar-11 5:12am

Ah. Sorry! Did you set the domain?

myes 30-Mar-11 5:26am

if i set username,password,domain as windows crendials and working directory never set it takes the default.Again exception of type arises below.
The specified executable is not a valid Win32 application.

OriginalGriff 30-Mar-11 5:41am

Show us the real code fragment: the latest exception is different from your original post.

myes 30-Mar-11 9:18am

Process p = new Process();

p.StartInfo.UseShellExecute =
false;

p.StartInfo.FileName ="";\File to be opened

p.StartInfo.UserName =""\Usename of the system

p.StartInfo.Domain ="";\Domain of the system

string d = "";\Password of the system

SecureString ss = new SecureString();

foreach (char c in d)

ss.AppendChar(c);

p.StartInfo.Password = ss;

p.Start();

myes 30-Mar-11 5:57am

what may be the best to give working directory

OriginalGriff 30-Mar-11 6:11am

Sorry, but I don't understand the question. Please try to reword it.

myes 30-Mar-11 9:22am

p.StartInfo.WorkingDirectory to specify means default %SYSTEMROOT%\system32.This path access is denied in vista and all hence i asked

Sergey Alexandrovich Kryukov · Answer 2 · 2011-03-29T21:45:00

Solution 1

Since when the SecureString build on the user name string makes the password?! Use debugger and test ss. Before calling p.Start is should be your password, one-to-one, without any "security" :-).

You probably totally misunderstood the purpose of SecureString. Read properly: http://msdn.microsoft.com/en-us/library/system.security.securestring.aspx[^]. There is a sample with the password on this page.

[EDIT]
I think I know the problem: this is not executable file but data file, a PDF. A user name and password are not applicable to the document. If the document is password-protected, this is different username/password, not those you pass to Process.

—SA

Posted 29-Mar-11 21:45pm

Sergey Alexandrovich Kryukov

Updated 29-Mar-11 22:36pm

v3

Comments

myes 30-Mar-11 4:18am

I tried with the sample used there with the given link .There also the exception arises logon failure :unknown username or bad password.

Sergey Alexandrovich Kryukov 30-Mar-11 4:29am

OK, did you do what I suggested with debugger? 1) start with just hard-coding username and password, 2) using debugger (always use debugger if you have any problems) stop at p.Start and check p for correct password and user name, 3) if it does not work, make sure you can start with the same username/password starting from shell.
--SA

OriginalGriff 30-Mar-11 4:35am

Morning SA! I suspect that he wants to open a passworded PDF, and doesn't realize what StartInfo.UserName is for... :laugh:

Sergey Alexandrovich Kryukov 30-Mar-11 4:40am

Exactly. This is so funny. I did not even look at the file name at first. I only noticed it while answering OP's follow-up comment...
--SA