C# Discussion Boards - CodeProject

ian mariano28-Oct-02 4:38

28-Oct-02 4:38

You know how IE does it? IE is an "ActiveX Document Host". The simplest way is to reuse the WebBrowser control in your form to host excel documents...
HOWTO: Use the WebBrowser Control to Open Office Documents with Visual C# .NET[^]

http://www.ian-space.com/

Re: How can I . . .

Venet31-Oct-02 5:40

Venet

31-Oct-02 5:40

Thank you for the info. No wonder why it wasn't working!

I think that should increase my project mark for about 10% Smile | :)

Regards,
Venet.

Donec eris felix, multos numerabis amicos.

How to send message to a form in C#?

Solmyr24-Oct-02 19:19

Solmyr

24-Oct-02 19:19

Like the API SendMessage, PostMessage. Confused | :confused:

---

Re: How to send message to a form in C#?

Stephane Rodriguez.24-Oct-02 21:56

Stephane Rodriguez.

24-Oct-02 21:56

You have a Search edit box, right above.

How low can you go ?
(MS rant)

Re: How to send message to a form in C#?

Mazdak25-Oct-02 8:48

Mazdak

25-Oct-02 8:48

So what?

Mazy

"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down

Re: How to send message to a form in C#?

Tom Archer25-Oct-02 13:59

Tom Archer

25-Oct-02 13:59

Great response!!

Cheers,
Tom Archer
Author - Inside C#, Visual C++.NET Bible

Re: How to send message to a form in C#?

Stephane Rodriguez.25-Oct-02 19:26

Stephane Rodriguez.

25-Oct-02 19:26

I wouldn't say it better...;P

How low can you go ?
(MS rant)

data bases

imran_rafique24-Oct-02 16:44

imran_rafique

24-Oct-02 16:44

can any body tell the sample code of inserting a row into a table and deleting a row from the table using acess data bases?

r00d0034@yahoo.com

Re: data bases

Rickard Andersson²⁰25-Oct-02 0:15

Rickard Andersson²⁰

25-Oct-02 0:15

public static  bool Execute(string Sql)
{
   OleDbCommand cmd = new OleDbCommand(Sql, 
                        new OleDbConnection(connectionString));
			
   cmd.Connection.Open();
   cmd.ExecuteNonQuery();	
	
   // release database connection
   if(cmd.Connection.State == ConnectionState.Open)
   {
       cmd.Connection.Close();
   }					
			

   return true;
}

More good examples at: http://www.dotnetnotes.com/index.aspx?catID=4[^]

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Single instance assembly

Anonymous24-Oct-02 14:29

Anonymous

24-Oct-02 14:29

Is it possible to have a single instance of a class library?
I need a class library that returns the same object when 2 clients are using reflection to create it:

Assembly assembly=Assembly.LoadFrom("myclasslibrary.dll");
Type[] tp=assembly.GetTypes();
object app=Activator.CreateInstance(tp[0]);

Can "app" be the same when I use this code in 2 windows applications?

Thanks,
Bruno

Re: Single instance assembly

Jon Rista24-Oct-02 16:18

Jon Rista

24-Oct-02 16:18

There is a design pattern called a singleton, which is a class designed in such a way that only one instance of it can ever be created. I've never created a singleton in a dll that is called from multiple windows applications, but you may find that the pattern applies to your situation.

There is a site I came accross a few months ago, The Pattern Digest, http://patterndigest.com/. It covers most well known design patterns, including the singleton. I beleive it also has links to other resources. It may help you create the kind of singleton object you need.

Re: Single instance assembly

Anonymous24-Oct-02 18:06

Anonymous

24-Oct-02 18:06

Actually, I thought of this, but it doesn't go across boudaries.

Re: Single instance assembly

James T. Johnson24-Oct-02 22:17

James T. Johnson

24-Oct-02 22:17

Remoting might work well for this; the sample chapter for Ingo Rammer's book Advanced .NET Remoting
[^] might just be enough to get you going.

Good luck,

James
Sig code stolen from David Wulff

Reverse IP Lookup in C#/.NET

Quimbly24-Oct-02 11:12

Quimbly

24-Oct-02 11:12

I'm developing a firewall log monitoring application in C#
with the .NET framework, and I can't figure out something.
I'm trying to do a reverse lookup on an IP address. I
don't mean reverse lookup to a DNS entry. I'm looking to
find out the computer-name behind the IP address.

The only thing I can find that's remotely related is:
Dns.GetHostByName() and Dns.GetHostByAddress().
However,these methods deal with IPHost objects, which only
contain DNS or IP information -- nothing about computer-
name.

Does anyone have any idea how to get a computer-name from
an IP address in my C#/.NET application? Is there anything
in .NET that will accomplish this? If so, what is it? If
not, what can I call outside of .NET that I can
incorporate into my application?

Thanks!

Re: Reverse IP Lookup in C#/.NET

Daniel Turini24-Oct-02 11:48

Daniel Turini

24-Oct-02 11:48

I don't know... Maybe trying a Interop call to NetWkstaGetInfo and passing the computer name as "\\x.x.x.x" ?? Confused | :confused:

Q261186 - Computer Randomly Plays Classical Music

Re: Reverse IP Lookup in C#/.NET

Jon Rista24-Oct-02 12:14

Jon Rista

24-Oct-02 12:14

This is on a windows network? There is the WNet api in the PlatformSDK. You might be able to import functions from the windows networking DLL's to access windows networking information like computer names (wouldn't that be NetBIOS?).

Re: Reverse IP Lookup in C#/.NET

Quimbly24-Oct-02 19:17

Quimbly

24-Oct-02 19:17

No, this is not specific to a Windows network. I need to be able to get the "computer name" of any in-coming IP address to the firewall.

Basically, I want my app to be able to do what a NSLOOKUP call does. Get what I mean?

Re: Reverse IP Lookup in C#/.NET

Jon Rista26-Oct-02 10:16

Jon Rista

26-Oct-02 10:16

Yeah, makes sense. Is there an RFC or public spec for what NSLOOKUP does? I'd search the net for something and see if you can figure out the message format for NSLOOKUP messages.

Re: Reverse IP Lookup in C#/.NET

ian mariano28-Oct-02 5:01

ian mariano

28-Oct-02 5:01

If it's "across the wire" all you're going to get is the DNS reverse lookup. Machine names are not necessarily the same as the DNS name, and all TCP/IP w/DNS will give you is just that: The DNS name, which may or not be the machine name.

NetWkstaGetInfo() will only work on Windows machines (Pre Windows 2000 or Pre Windows 2000 compatible) where Anonymous access is allowed (a reeeeely reeeeeely reeely bad practice!)

Why do you need to know the actual machine name anyway? If there's suspicious behavior, you can trace the IP back. If it's illegal behavior, you can go deeper and give the authorities your firewall logs for the offense.

Moving only Web colors from the knowncolors Enumeration

mkushner24-Oct-02 9:05

mkushner

24-Oct-02 9:05

Hi All,
I'm trying to move colors for index 27 and beyond from the Colors enumeration to a new string[] array. The following moves them fine into the new array, and writes them out, but when the Databind occurs, it give me the following error.

Object reference not set to an instance of an object.

KnownColor enumColor = new KnownColor();
Array Colors = Enum.GetValues(enumColor.GetType());

string[] WebColors = new string[150];
for (int i=27; i< Colors.Length;i++)
{
WebColors[i-27] = Color.FromName(Colors.GetValue(i).ToString()).Name.ToString();
}

foreach (string s in WebColors)
{
Response.Write(s + "
");
}

cboColor.DataSource = WebColors;
cboColor.DataBind(); ERROR IS HAPPENING ON THIS LINE

I would be VERY thankful for any help.

Thanks,
Mike

Is C# intended for network programming as well?

steinher24-Oct-02 8:09

steinher

24-Oct-02 8:09

I'm a CS student, and i need to write a console application which basically writes data packages read with a sniffer to a logfile and then sends data from a different logfile to a remote machine using TNS protocol over TCP. My app also has to communicate with a third party through another unique protocol over TCP.

As i never programmed with C# before, my question is if C# is suited for this kind of project or am i better off with C++ ?

Re: Is C# intended for network programming as well?

Stephane Rodriguez.24-Oct-02 8:19

Stephane Rodriguez.

24-Oct-02 8:19

You would be amazed how simple it is. See the System.Net.Sockets namespace, you have TcpClient and TcpServer class stuff waiting for you. As far as I can remember, there are articles on CP about this as well.

Good luck!

How low can you go ?
(MS rant)

Re: TCPClient....

Masaaki Onishi24-Oct-02 16:30

Masaaki Onishi

24-Oct-02 16:30

Hello, the codegurus around the world.;)

Well, I guess that TCPClient class is never the powerful approaches
as CAsyncSocket class as well as WinSock API.

You can use System.Net.Sockets rather than TCPClient on more complicated process.
Actually, I'm waiting that someone writes P2P application by C#.
Or we can get a whol bunch of WinSock APIs by Dllimport. Dead | X|

I'm missing CAsyncSocket class in C#.
Why didn't Microsoft create this kind of approaches inserting the socket message in the windows message process. Cry | :((

Please, don't send me your email about your questions directly.
Have a nice day!
Sonork - 100.10571:vcdeveloper Wink | ;)

-Masaaki Onishi-

Re: TCPClient....

Christopher Lord25-Oct-02 15:31

Christopher Lord

25-Oct-02 15:31

You can do async sockets on .NET. Several of my projects use the async functionality. Blocking sockets are mostly useless for the sorts of things I do.

.NET async sockets actually use IO completion ports internally, so its far better than CAsyncSocket. Oh, and they use delegates for notification, not windows messages.

opening a pdf document using c sharp??

Asim N.24-Oct-02 2:19

Asim N.

24-Oct-02 2:19

hello
want to know some api's for opening and editing pdf file.
in c sharp.(c#).

Asim

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.