Re: Is there bidirectional iterator in C# - C# Discussion Boards

Re: Hide Windows Application in System Tray?

Stefan Troschuetz5-Sep-06 5:23

5-Sep-06 5:23

Some threads below you find a description how to capture the minimizing of your form. Then you only need to call Form.Hide, set Form.ShowInTaskBar false and call Show of a NotifyIcon component dropped on your form at design time. To show your app again register to the NotifyIcon.Click event and reverse the steps described above.

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook

www.troschuetz.de

Is there bidirectional iterator in C#

AndriyZZ5-Sep-06 5:11

AndriyZZ

5-Sep-06 5:11

Hello

Is there bidirectional iterator(it is desirable for generics) in C#? (May be third party implementation).

Andriy

Re: Is there bidirectional iterator in C#

Not Active5-Sep-06 7:28

Not Active

5-Sep-06 7:28

There isn't one that I can recall, however, it is relatively easy to make one using the yield keyword in 2.0

only two letters away from being an asset

Re: Is there bidirectional iterator in C#

AndriyZZ5-Sep-06 9:37

AndriyZZ

5-Sep-06 9:37

Mark, thank you for advice. I think you've meant smth like this:
public IEnumerator<t> GetEnumerator() {
if (left != null) foreach (T x in left) yield x;
yield value;
if (right != null) foreach (T x in right) yield x;
}

But I need calling "MoveNext" and "MovePrevious" in arbitrary order e.g.: "MoveNext", "MoveNext", "MoveNext", "MovePrevious", "MoveNext", "MoveNext".

If you know how to implement discribed behaviour using "yield" please write small code snippet. I haven't found how to do it after investigating C# Specification describing "yield".

I think possible solution can be wrapping LinkedList.
What do you think about this?

Re: Is there bidirectional iterator in C#

Not Active5-Sep-06 9:49

Not Active

5-Sep-06 9:49

Try this How to: Create an Iterator Block for a Generic List[^]

only two letters away from being an asset

Re: Is there bidirectional iterator in C#

AndriyZZ5-Sep-06 10:17

AndriyZZ

5-Sep-06 10:17

Mark, but this sample likes code snippet I've sent you in previous post. It doesn't fit for my task. Because I need calling several "MoveNext" in the side of "Top" not reaching the last element and then call "MovePrevious"(IEnumerator doesn't contain it at all). How can you do it using sample you've sent?

Re: Is there bidirectional iterator in C#

Not Active5-Sep-06 10:34

Not Active

5-Sep-06 10:34

Sometimes you need to do more than cut & paste. You have all the tools necessary to create what you are asking for. Right, IEnumerator does not have a MovePrevious method, so create one. Roll eyes | :rolleyes:

only two letters away from being an asset

Re: Is there bidirectional iterator in C#

Nader Elshehabi5-Sep-06 11:10

Nader Elshehabi

5-Sep-06 11:10

Hello

I don't know why you are making things compicated for yourself?? Random access collections work fine in most scenarios!! If you don't want to wrapp an iterator to implement what you need, well, here is a simple - poor pratice- way to simulate what you need.

1- Make a private random access collection. eg. ArrayList
2- Make a private integer to store the current index
3- Make a public object of the type you want to store in the ArayList.
4- Make to public methods MoveNext(), MoveBack(), to increase/decrease the CurrentIndex and store MyIterator[CurrentIndex] in ther public object you created.

Regards

Re: Is there bidirectional iterator in C#

AndriyZZ5-Sep-06 11:20

AndriyZZ

5-Sep-06 11:20

Thank you, this is what I am about to implement. I've just hoped that there is already implemented bidirectional up-to-date for changes iterator.

Shell Namespace Question

RSL-REK5-Sep-06 4:59

RSL-REK

5-Sep-06 4:59

Hello,
I am trying to implement drag within my shell namespace extension. I noticed that in MFC you are able to set up a message area to attach to the events such as OnBeginDrag.

My question is; How do I attach to those events using c#?

Thank you,
Rick

Rick

Rick

Re: Shell Namespace Question

led mike5-Sep-06 7:52

led mike

5-Sep-06 7:52

They hide that information in the Documentation[^]

"Alot of the people on this forum are incredibly stupid, thinking that the internet is real"
Score: 1.0 in the Soap Box

led mike

Re: Shell Namespace Question

RSL-REK8-Sep-06 4:46

RSL-REK

8-Sep-06 4:46

Yes,
I get that part about the event, but How do i attach to an event that is sent by the windows shell.

Rick

Re: Shell Namespace Question

led mike8-Sep-06 4:58

led mike

8-Sep-06 4:58

Rick, with a little Googling i found this CodeProject Article[^] maybe it will help

"Alot of the people on this forum are incredibly stupid, thinking that the internet is real"
Score: 1.0 in the Soap Box

led mike

serial communication with antenna

faladrim5-Sep-06 4:31

faladrim

5-Sep-06 4:31

hi,

i would like to make a serial communication with an antenna to send and recieve data from another antenna, the first one is connected on a com port of my pc. i program it in visual studio 2003
but i dont know how to start
does anybody know a site with samples that could help me?
thxx

Re: serial communication with antenna

Dan Neely5-Sep-06 5:08

Dan Neely

5-Sep-06 5:08

serial communications are much easier using the provided System.Ports.Serial class in VS05. IF you're unable to use the (free) express edition of 05, there are several user written libraries available on this site if you use the search function.

Re: serial communication with antenna

Nader Elshehabi5-Sep-06 11:02

Nader Elshehabi

5-Sep-06 11:02

Hello

To access any port -Serial, LPT, USB, etc...- or device -eg. modem- in C3 you follow these steps:
1- Call Windows API CreateFile() function with the device name as the filename. ie. CreateFile("COM1") for example.
2- Get The handle of the created file.
3- Supply that handle to the constructor of a FileStream object.
4- Use that FileStream object to read and write from/to the port/device.

And no, you can't construct a FileStream from the port directly. Sorry!

Regards

Unable to read app.config file

Goalie355-Sep-06 4:18

Goalie35

5-Sep-06 4:18

I'm trying to open a database connection via my app.config file however my connection string keeps coming back as NULL.

Here's my app.config file:
----------------------------------
<connectionStrings>
<add name="DBConn" connectionString="Data Source = myDataSource;Initial Catalog = catalogName;User Id =myUserId;Password = myPword;"
providerName="System.Data.SqlClient"/>
</connectionStrings>
-------------------------------------

Here's the code I'm using to open my connection. The "settings" variable keeps coming back as null:
---------------------------------------
string cnString = null;

// Look for the name in the connectionStrings section.
ConnectionStringSettings settings =
ConfigurationManager.ConnectionStrings["DBConn"];

// If found, return the connection string.
if (settings != null)
cnString = settings.ConnectionString;

connection = new SqlConnection(cnString);
connection.Open();
------------------------------------------------

Do I perhaps have my app.config in the wrong location? I placed it in the root directory of my project (located alongside my project and ".cs" file).

Thanks in advance.

-Goalie35

Re: Unable to read app.config file

Rob Philpott5-Sep-06 4:34

Rob Philpott

5-Sep-06 4:34

Looks ok to me!

Have you got the <connectionStrings> under <configuration> (where it should be) and not in the app settings or something like that?

Regards,
Rob Philpott.

Re: Unable to read app.config file

Goalie355-Sep-06 4:46

Goalie35

5-Sep-06 4:46

Hi Rob. Thanks for replying.
My full app.config looks like the following:
-------------------------------------------------
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="ReportDBConn"
connectionString="Data Source = myConnectionString;Initial Catalog = catalogName;User Id =myuserId;Password = myPword;"
providerName="System.Data.SqlClient"/>
</connectionStrings>
</configuration>
---------------------------------------------------

Thanks again.

-Goalie35

Re: Unable to read app.config file

S. Senthil Kumar5-Sep-06 18:03

S. Senthil Kumar

5-Sep-06 18:03

Are you able to see <yourexename>.app.config in the bin/Debug (or Release) directory? Did you add your app.config manually or through the Add Items menu in VS .NET? If it's the former, then VS .NET doesn't generate exename.app.config automatically.

Regards
Senthil
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Command line and args[] question

User 66585-Sep-06 3:56

User 6658

5-Sep-06 3:56

Hi
How does .NET split the command line arguments to generate the args[] array?
Does it just to a string.Split(fullCommandLine, ' ')?
If yes, will this code be correct to complely restore the full command line?

string parameters = "";
foreach (string s in args)
{
     parameters += " " + s;
}
parameters.TrimEnd(' ');

The reason behind is this question is that I have to use the complete command line, because I parse a parameter that uses a file path like -file="C:\Documents and Settings"

This will be split by .NET. In C++ we had a lpCommandLine which contained the complete command line. Does my loop do the same thing?

regards

modified 12-Sep-18 21:01pm.

Re: Command line and args[] question

trannguyen865-Sep-06 4:18

trannguyen86

5-Sep-06 4:18

yes it is but you should replace parameters.TrimEnd(' '); by parameters=parameters.trim();

Re: Command line and args[] question

User 66585-Sep-06 4:20

User 6658

5-Sep-06 4:20

Okay thanks.
I wanted to edit my post to change it to "Trim", but the operation always fails with an error message. I hate this server Dead | X|