Re: Things are not working as expected - C# Discussion Boards

26-Apr-04 5:12

hey guys, can any1 please tell me wtf is wrong with the following code Cry | :((

private void panelRightView_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
  System.Drawing.Graphics oGfx = this.panelRightView.CreateGraphics();
  System.Drawing.Rectangle rect = this.picTitleBar.Bounds;
  oGfx.DrawLine(_penLine, rect.Right, rect.Bottom, this.panelRightView.ClientSize.Width - rect.Right, rect.Bottom);
}

The scenario is like this: I've two panels on my Windows form panelLeftView (LEFT docking) and panelRightView (FILL docking). In my right panel's PAINT event handler, I need to draw a f@#king line. The line draws ok, works exactly as I want, it expands when I increase the width of the form, but the problem is that this code doesn't work if I decrease the width of the form Mad | :mad:

. The line previously drawn is not cleared when i reduce the form width. Can any .Net guru (especially of C#) tell me why is this happening? Am I doing something wrong Unsure | :~

? Or is that problem occuring only to remind me that I'm working on Microsoft's technology where nothing seems to work as expected Dead | X|

???

Please Help.

Thanks

Gurmeet S. Kochar

If you believe in God, it's because of the Devil

My CodeProject Articles: HTML Reader C++ Class Library, Numeric Edit Control

Jon G26-Apr-04 5:20

Jon G

26-Apr-04 5:20

When resizing the form , you NEED to redraw the control, otherwise it will only display what is in the video memory. My terminology is probably not 100% accurate, but all you really need to know is that you need to refresh your form, and it will work.

just do:

this.refresh();

gUrM33T26-Apr-04 5:29

26-Apr-04 5:29

First of all, I want to thank you for a super quick reply. And second, I again want to thank you for giving me the perfect answer. Yes, it worked.

Thank you very much

Gurmeet S. Kochar

If you believe in God, it's because of the Devil

My CodeProject Articles: HTML Reader C++ Class Library, Numeric Edit Control

gUrM33T26-Apr-04 5:24

26-Apr-04 5:24

BTW, I'm issuing this.panelRightView.CreateGraphics() instead of e.Graphics because in the latter case, the line only draw once and then doesn't expand at all when form's width is increased. I dunno the reason but ....

Gurmeet S. Kochar

If you believe in God, it's because of the Devil

My CodeProject Articles: HTML Reader C++ Class Library, Numeric Edit Control

Heath Stewart26-Apr-04 5:53

26-Apr-04 5:53

You need to force the control to refresh when resized and DO NOT create a new Graphics object in the Paint event handler. Besides, even if you do, you must call Graphics.Dispose on it or you're going to find your memory consumption increasing and performance decreasing.

To force your control to repaint itself when it resizes, you can do this a number of ways. The easiest is just to call SetStyle(ControlStyles.ResizeRedraw, true); in your constructor. You could also set the protected ResizeRedraw property to true in your constructor. These result in the same effect.

Microsoft MVP, Visual C#
My Articles

gUrM33T26-Apr-04 15:30

26-Apr-04 15:30

Heath Stewart wrote:
Besides, even if you do, you must call Graphics.Dispose on it or you're going to find your memory consumption increasing and performance decreasing

Hey, what about that Garbage Collection thing? Confused | :confused:

Heath Stewart wrote:
To force your control to repaint itself when it resizes, you can do this a number of ways

Well, I tried using SetStyle but it says
"Cannot access protected member 'System.Windows.Forms.Control.SetStyle(System.Windows.Forms.ControlStyles, bool)' via a qualifier of type 'Panel'; the qualifier must be of type 'FormPackages' (or derived from it)".

Gurmeet S. Kochar

If you believe in God, it's because of the Devil

My CodeProject Articles: HTML Reader C++ Class Library, Numeric Edit Control

Heath Stewart27-Apr-04 2:39

Splitting a string into a substring and into chars?

27-Apr-04 2:39

Gurmeet S. Kochar wrote:
Hey, what about that Garbage Collection thing?

The Graphics class - like many other class in the .NET FCL - use native resources (unmanaged) so the GC cannot collect them. Read Programming for Garbage Collection[^] in the .NET Framework SDK to learn more.

Gurmeet S. Kochar wrote:
Well, I tried using SetStyle but it says...

As I mentioned, you should call this in your constructor - the constructor for the control you're writing, which means you must extend the base class you want and add it to your constructor:

public class MyPanel : Panel
{
  public MyPanel()
  {
    SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer
      | ControlStyles.UserPaint, true);
    // ...
  }
  // ..
}

Microsoft MVP, Visual C#
My Articles

Eolus26-Apr-04 5:03

Eolus

26-Apr-04 5:03

Only a short question,

is there a chance to splitting a string into substrings and chars?
I have no idea how to make this. To split a string in substrings it's clear to me, also to make a string to chars... but how could i split substrings and chars from one string?

If you want realize your dreams, you shouldn't sleep!

Problem With tcpclient.GetStream()

Tarakeshwar26-Apr-04 1:15

Tarakeshwar

26-Apr-04 1:15

Hi All,

I am writing a code to transmit data from a client to a server using sockets. The first data transmitted from the client to the server gets transmitted, after that I get a error when I attempt to send a 2nd set of data. It says "Operation not allowed on non-connected sockets". Part of my code is

Client Code:

private void TcpDataSendTransmitter()
{
/*This is line which is giving me the error*/
networkStream = tcpClientListner.GetStream();
streamWriter = new System.IO.StreamWriter(networkStream);
streamReader = new System.IO.StreamReader(networkStream);
try
{
string temp = txtData.Text;
streamWriter.WriteLine(temp);
streamWriter.Flush();
listBoxClient.Items.Add(temp);
}
.
.
.
}

Server code:

if(clientSocketListener.Connected)
{
NetworkStream networkStream = new NetworkStream(clientSocketListener);
System.IO.StreamWriter streamWriter = new System.IO.StreamWriter (networkStream);
System.IO.StreamReader streamReader = new System.IO.StreamReader(networkStream);
streamWriter.WriteLine("Server: Your Are Connected");
streamWriter.Flush();
temp = streamReader.ReadLine().ToString();
listBoxServer.Items.Add(temp);
}

What could be the possible Solution for this.

Regards
Tarakeshwar

Re: Problem With tcpclient.GetStream()

Heath Stewart26-Apr-04 3:24

Re: Problem With tcpclient.GetStream()

26-Apr-04 3:24

Judging by the exception message, your client or server has disconnected. Look through your code and 1) make sure your code is tolerant in such cases, since this is something you really can't control (either one could loose their connection at any time, and 2) that you are closing your connection prematurely. I see nothing of the sort in your sample code, but it could easily exist elsewhere in your code.

Microsoft MVP, Visual C#
My Articles

Tarakeshwar26-Apr-04 4:08

Tarakeshwar

26-Apr-04 4:08

Yeah I went through the Code, I think the problem is in my server Code. I have been trying to debug it. The problem is I have initialised the connection in the Connect Button. So only for the first instance when I connect using the button the connection exist. After that the server is not in the listening mode as the event is in the connect button. I will have to initialise my tcp Connection and the thread outside the button click event. That should hopefully solve the problem.

Tarakeshwar
MCSE(Security), CCIE Q(Routing and Switching)

Re: Problem With tcpclient.GetStream()

Heath Stewart26-Apr-04 4:20

26-Apr-04 4:20

If your TCP socket connection variable (TcpListener or whatever you're using) is declared in the event handler, then it will be garbage collected when it goes out of scope (and when the GC gets around to it). You need to at least declare it outside of your event handler, just like buttons, text boxes, and other UI components are declared as fields and initialized in a method.

Microsoft MVP, Visual C#
My Articles

OOP help

Atazoth26-Apr-04 0:31

Atazoth

26-Apr-04 0:31

did a program that lists stats for creatures that will combat each other. Need some help to clone this object for the users desired number of fighters and then each winner will combat the other winner until there is one winner.

i am new to this stuff. hope i am not asking to much or even if it is bad manners or anything.

Re: OOP help

Heath Stewart26-Apr-04 3:21

A new open-source filebrowser

26-Apr-04 3:21

If you're new to .NET development, why don't you start creating simple applications and reading the vast number of articles on .NET development (with C#, VB.NET, and other languages) on sites like CodeProject?

If you want to write an application, this is not the place for help to write an entire application. This forum - and pretty much any other forum you'll ever find - are for specific problems or questions, not to help you write an application from scratch. That requires actually knowing something about programming, and only you can discover that.

Microsoft MVP, Visual C#
My Articles

Re: OOP help

Jeff Varszegi26-Apr-04 3:44

Jeff Varszegi

26-Apr-04 3:44

I agree with what you said, but I sometimes think that OOP would be a good topic for a discussion board. Did anyone ever suggest that?

Regards,

Jeff Varszegi

Jonathan Slenders26-Apr-04 0:25

Jonathan Slenders

26-Apr-04 0:25

Hi
I developed a new open-source filebrowser with c# that i want to share with you.

You can download it here:
www.slender.be

The application runs very nice but contains also some errors. When you are searching for a file. Sometimes i got a thread error. And the progressbar in the move/copy dialog doesn't work very good.

I hope you can help me developing this application.

(if you don't want helping me, you can always try to use it.)

Jonathan Slenders

Jonathan Slenders

object oriented program help

Anonymous26-Apr-04 0:10

Anonymous

26-Apr-04 0:10

Datagrid and dataset

Appelz25-Apr-04 23:09

Appelz

25-Apr-04 23:09

hello,

I'm using an Xml-file to fill my dataset and i place the dataset in my datagrid. My problem is that when i click a row in the datagrid, i want the data in text and/or checkboxes that are placed below the datagrid. Is this possible?

thx in advance!

DougW4826-Apr-04 17:19

DougW48

26-Apr-04 17:19

In a handler, you can get the CurrentRowIndex of your datagrid. You can use this to get values from your cells. You shouldn't have much trouble putting them into your other boxes below the grid.

something like

textBox1.Text = dataGrid1[dataGrid1.CurrentRowIndex,0].ToString();

You'll have to play around with it a little. Good luck

Jay Shankar26-Apr-04 21:58

Jay Shankar

26-Apr-04 21:58

Hi Appelz,

Following code will get you the text in the DataGrid cell where mouse is being clicked.
Paste the following code in MouseUp event of the DataGrid Control.

private void DataGrid1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)<br />
{<br />
	System.Drawing.Point pt = new Point(e.X, e.Y); <br />
	DataGrid.HitTestInfo hti = DataGrid1.HitTest(pt); <br />
<br />
	if(hti.Type == DataGrid.HitTestType.Cell) <br />
	{ <br />
		string str = "";<br />
		str = DataGrid1[hti.Row, hti.Column].ToString();<br />
		MessageBox.Show(str);<br />
	} 	<br />
		<br />
}

Do revert back, whether you could achieve the functionality or not.

Regards,

Jay.

Appelz26-Apr-04 23:50

Appelz

26-Apr-04 23:50

yes thank you it works well

But i put what is in the messagebox, in a textbox so it can be edited.
Now i added a button and if you click on it i want the data added in the textbox back into the grid (in the right cell).

is this possible or too difficult because i can't make it work?