Re: Console application keypress - C# Discussion Boards

ChrisKo17-Sep-07 12:33

ChrisKo

17-Sep-07 12:33

Finally{} statement will execute no matter what, so you will always redirect to FileManager.aspx.

Also, remove the Catch {} statement if you don't plan to handle any specific exceptions.

T4AMD17-Sep-07 12:42

T4AMD

17-Sep-07 12:42

Maybe in that case then I should not use Try..Catch method. What is the other way for me to work with this??

ChrisKo17-Sep-07 12:50

ChrisKo

17-Sep-07 12:50

SqlConnection sqlconSource = new SqlConnection(ConfigurationManager.AppSettings["cs"]);
SqlCommand sqlcmdSource = new SqlCommand("LogOn", sqlconSource);
sqlcmdSource.CommandType = CommandType.StoredProcedure;
sqlcmdSource.Parameters.Add(new SqlParameter("@UserName", SqlDbType.VarChar, 40));
sqlcmdSource.Parameters.Add(new SqlParameter("@Password", SqlDbType.VarChar, 10));
sqlcmdSource.Parameters["@UserName"].Value = txtUserName.Text;
sqlcmdSource.Parameters["@Password"].Value = txtPassword.Text;

sqlconSource.Open();

if (sqlcmdSource.ExecuteScalar().ToString() == "0")
   Response.Redirect("AccessDenied.aspx");
else
   Response.Redirect("FileManager.aspx");

sqlconSource.Close();

If you want the Try{} Catch{} because you want to handle a specific SQL exception then do it this way

Try
{
   SqlConnection sqlconSource = new SqlConnection(ConfigurationManager.AppSettings["cs"]);
   SqlCommand sqlcmdSource = new SqlCommand("LogOn", sqlconSource);
   sqlcmdSource.CommandType = CommandType.StoredProcedure;
   sqlcmdSource.Parameters.Add(new SqlParameter("@UserName", SqlDbType.VarChar, 40));
   sqlcmdSource.Parameters.Add(new SqlParameter("@Password", SqlDbType.VarChar, 10));
   sqlcmdSource.Parameters["@UserName"].Value = txtUserName.Text;
   sqlcmdSource.Parameters["@Password"].Value = txtPassword.Text;

   sqlconSource.Open();

   if (sqlcmdSource.ExecuteScalar().ToString() == "0")
      Response.Redirect("AccessDenied.aspx");
   else
      Response.Redirect("FileManager.aspx");
}


Catch (SqlException e)
{
//however you want to handle the exception
}


Finally
{
   if (sqlconSource.State == ConnectionState.Open)
      sqlconSource.Close();
}

Console application keypress

PIEBALDconsult17-Sep-07 14:01

PIEBALDconsult

17-Sep-07 14:01

I suggest hashing the password, rather than storing the raw password.
Maybe others have better ideas as well?

ballzinator17-Sep-07 11:50

ballzinator

17-Sep-07 11:50

I have a console application running in an infinite loop, it simply parses text files. I need to know how to detect a keypress and then determine which key was pressed. I want the program to terminate upon the pressing of the escape key. Any help would be appreciated, I've been combing the web all over and have found nothing to be helpful.

Re: Console application keypress

ChrisKo17-Sep-07 12:27

ChrisKo

17-Sep-07 12:27

ConsoleKeyInfo cki = Console.ReadKey(true);
Console.WriteLine(cki.Key.ToString());

Check the ConsoleKeyInfo.Modifiers collection for the ALT, CTRL, SHIFT keys and you can compare them with the ConsoleModifiers enum.

you can use whatever loop structure you want

do
{
//do stuff
}
while (cki.Key != ConsoleKey.Escape);

You can simply find this information in the MSDN article for Console.ReadKey()[^]

Re: Console application keypress

ballzinator18-Sep-07 3:27

ballzinator

18-Sep-07 3:27

This will not work. I need to be able to be able to exit at any give time upon the keypress.

Re: Console application keypress

Big Daddy Farang18-Sep-07 8:22

Big Daddy Farang

18-Sep-07 8:22

That makes it a little tougher. Which version of .NET are you using? The Console.ReadKey() that Chris suggested is not available until 3.0, unfortunately.

Seems to me that you'll want to make frequent checks for "escape key pressed" within your infinite loop. Some pseudo-code:

while (true)
{
  flag = false
  get next file
  open file
  while (not flag)
  {
    read line from file
    if eof
      flag = true
    else
    {
      process data from file
      if escape key pressed
        flag = true
    }
  }
  close file
  if flag
    exit program
}

The big problem remaining is how to determine if the escape key has been pressed. If you're using 3.0 then Console.ReadKey() should do it. If not, well does it have to be the escape key? The enter key would a lot easier to detect: Console.ReadLine().

BDF

what is better c# or vb.net ??

sofy200817-Sep-07 11:49

sofy2008

17-Sep-07 11:49

Iam doing my graduation project and i need to language which is better to dealing with 3d graphics , because i need to build a 3d home from 2d home ( which is drawing by user by this langauge ) and i don't which is better c# or vb.net ??? beacase i need to learn it ...

Matthew Cuba17-Sep-07 12:42

Matthew Cuba

17-Sep-07 12:42

Do you have a C/C++/Java background? I'd recommend C#.

Otherwise, I'd say take a few days and play around with both of them and get a feel for the synax because it is different. I'd still recommend C#, but there are solutions for either language.

I've got a book by Apress called "Pro .NET 2.0 Graphics Programming using GDI+. It is pretty good and is a C# book.

Good Luck!

It isn't enough to do well in life.
One must do good when and where one can.
Otherwise, what's the point?

Patrick Etc.17-Sep-07 13:33

Patrick Etc.

17-Sep-07 13:33

For graphics and vector manipulation? You'll tear your hair out trying to use VB.NET for such a thing. Two main reasons:

1. The C# syntax is unambiguous when you're referencing array/matrix/vector indices. In VB.NET, array access and function calls are syntactically identical.

2. Numeric manipulation. VB.NET conceals every rounding, casting, and floating point operation. It tries its best to figure out what you wanted and when precision matters, always gets it wrong unless you're very well versed in the language and know exactly when to cast and when not to.

Obviously either language WILL work for this and depending on your skill level, it may not make any difference. But like the previous poster says - if you've already got a background in C++/Java then C# will be easier to use.

The early bird who catches the worm works for someone who comes in late and owns the worm farm. -- Travis McGee

PIEBALDconsult17-Sep-07 13:58

PIEBALDconsult

17-Sep-07 13:58

" If you're a bird be an early early bird.
But if you're a worm, sleep late.
"
-- Shel Silverstien (unless I'm mistaken)

Luc Pattyn17-Sep-07 14:41

Luc Pattyn

17-Sep-07 14:41

if the bird wants to catch the worm it'd better C#[^]

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google

BoneSoft17-Sep-07 17:50

BoneSoft

17-Sep-07 17:50

Seems to depend mostly on your background which you'll prefer.

If you have experience with javascript, C++ or Java, you'll be most comfortable with C#.

If you have primarily done nothing but VB and VB script, you'll likely choose... that's right, VB.

If you don't like to be bothered with icky things like type safety and explicit conversion and confusing things like that, you'll be most confortable with VB.

If you like using the occational array, or are interested in readable syntax, or like behavior to follow what you wrote, you'll like C#.

If you like mystical built in 'functions' that won't convert to any other language and exist only for backward compatability, you'll like VB.

If you like pretty code that's nice and easy to read, you'll like C#.

If you like blocky crap with capitalized keywords that require extra typing or letting the IDE dump large chunks of code you may not have wanted, VB's your language.

If you like having no control what-so-ever over code or comment formating, VB's for you.

If you want to be part of the future, C#'s for you.

If you want to be on the stinky end of a sinking ship, VB's what you want.

Like I said, you'll be most comfortable with whatever you're most experienced with. And for the most part, your choice won't affect your options (technically they are both capable of producing the same results). It's really just a personal choice. But I won't taint your decision with my own personal choice. Poke tongue | ;-P

Try code model generation tools at BoneSoft.com.

Big Daddy Farang18-Sep-07 8:30

Big Daddy Farang

18-Sep-07 8:30

BoneSoft wrote:
But I won't taint your decision with my own personal choice.

I was astounded by your objectivity! Got my five. Big Grin | :-D

BoneSoft18-Sep-07 8:51

BoneSoft

18-Sep-07 8:51

Eh well, it important to not take sides. Wink | ;)

Try code model generation tools at BoneSoft.com.

PIEBALDconsult17-Sep-07 18:15

PIEBALDconsult

17-Sep-07 18:15

Compare this list http://msdn2.microsoft.com/en-us/library/x53a06bb(VS.80).aspx[^]

to this one http://msdn2.microsoft.com/en-us/library/ksh7h19t(VS.80).aspx[^]

and decide which is easier to learn.

Nouman Bhatti17-Sep-07 18:58

Nouman Bhatti

17-Sep-07 18:58

as u r still studying and. i hope that u do most of your course projects in native C or VC or in java..

so C# is more like the above
and it is more popular than vb so i suggest u to stick with c#

How to connect to network printer via C#

sofy200818-Sep-07 9:18

sofy2008

18-Sep-07 9:18

Thanks..
Iam now be very clear to use c# after thier suggestion ...

Thanks very match again..

coleschuk17-Sep-07 11:07

coleschuk

17-Sep-07 11:07

Hi,

How can I connect a network printer to a user session via C#???

For example:
I want to connect "\\intranet\phaser" to my current user session and show up as a network-based printer in my local Printers and Faxes folder.

Chris

zhousz17-Sep-07 17:28

zhousz

17-Sep-07 17:28

You should add the printer to your local

ekynox17-Sep-07 17:35

ekynox

17-Sep-07 17:35

you can actually use WMI to install a network based printer.
Here is an example of how it is done using VB script
http://www.microsoft.com/technet/scriptcenter/resources/qanda/dec06/hey1212.mspx[^]

To access WMI in C#, you need to access the System.Management namespace.

If you are stuck post back here again.

coleschuk18-Sep-07 3:27

coleschuk

18-Sep-07 3:27

Thanks, but I got it. Here is what I did:

[DllImport("winspool.drv")]
public static extern bool AddPrinterConnection(string pName);
[DllImport("winspool.drv")]
public static extern bool SetDefaultPrinter(string printerName);

bool result = AddPrinterConnection(@"\\server\printer");
bool resultdef = SetDefaultPrinter(@"\\server\printer");

Chris

ekynox14-Nov-07 0:52

ekynox

14-Nov-07 0:52

anychance you can explain how you managed to add a printer connection to a remote computer ?