C# Discussion Boards - CodeProject

Re: Efficient way to number x-y Axes?

Christian Graus25-Jul-05 16:18

Christian Graus

25-Jul-05 16:18

A forloop and DrawString, I would have thought...

Christian Graus - Microsoft MVP - C++

DAL or no DAL

Tom Wright25-Jul-05 12:40

Tom Wright

25-Jul-05 12:40

I'm writting an app that I hope to sell and develope into an enterprise type app. It came to my attention that I should have all my data access in a DAL along with my business objects. So my question is at what point is it necessary to implement a DAL and business object layer as to just writting a class for data access and keeping your business objects in your main app class?

Thanks

Tom Wright
tawright915@yahoo.com

Re: DAL or no DAL

Christian Graus25-Jul-05 16:19

Christian Graus

25-Jul-05 16:19

Tom Wright wrote:
So my question is at what point is it necessary to implement a DAL and business object layer as to just writting a class for data access and keeping your business objects in your main app class?

Now. You should always do your business tier in a seperate dll, and your data access in another seperate dll. The reason is simple, it forces you to keep these layers seperate, which makes it easier to replace any layer if you ever need to, and to encapsulate your code in logical components.

Christian Graus - Microsoft MVP - C++

Return an Image from a .DLL

kim3er25-Jul-05 11:39

kim3er

25-Jul-05 11:39

Hi,

I was hoping you could help me with a problem I'm having. I am writing a .DLL that reorders and renames a folder of images using System.Drawing.Image and System.IO. The .DLL is called from a Windows form, which catches events as the .DLL processes each file. I'd like the Windows application to show the image that is currently being processd.

My solution has been to create an event that is triggered as each new image is identified, passing the image out. I cannot just pass out the actual image, as the calling application's picture box would lock the image so it couldn't be moved etc by the .DLL.

What I have done instead is to redraw the image as a smaller bitmap (to the dimensions of the picturebox), this works in as much as it doesn't lock the file, but the picture box is blank (though there is a bitmap being passed, according to the Auto dialog).

I've checked my bitmap code in a seperate application that doesn't rely on an external .DLL and it works.

I've successfully passed strings and integers out, that have then appeared in the appication.

I'd like to know if I'm doing this the best way and where I am going wrong, cheers!

Bitmap conversion code in .DLL, DoNextFile is the trigger.

System.Drawing.Image img = System.Drawing.Image.FromFile(sour_file);<br />
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(144, 108);<br />
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmp);<br />
g.DrawImage(img, 0, 0, 144, 108);<br />
<br />
DoNextFile(bmp);

Creation of the Trigger in .DLL

public delegate void NextFile (System.Drawing.Image img);<br />
public event NextFile Next;<br />
<br />
private void DoNextFile(System.Drawing.Image img)<br />
{<br />
	if (Next!=null)<br />
	Next(img);<br />
}

Catch code in Windows app.

public void CatchNextFile (System.Drawing.Image img)<br />
{<br />
	if (pbxFile != null)<br />
	{<br />
		pbxFile.Dispose();<br />
	}<br />
	pbxFile.Image = img;<br />
	this.Update();<br />
}

Re: Return an Image from a .DLL

EssOEss25-Jul-05 20:20

EssOEss

25-Jul-05 20:20

Well, you are Disposing of the picturebox... perhaps you meant pbxFile.Image.Dispose()? Wink | ;)

Re: Return an Image from a .DLL

kim3er25-Jul-05 22:08

kim3er

25-Jul-05 22:08

If it's that easy I'm not sure but I might cry...

Re: Return an Image from a .DLL

kim3er26-Jul-05 7:24

kim3er

26-Jul-05 7:24

Thank you for your help, I can't believe I made such a mistake.

Thanks again. Big Grin | :-D

Removing embedded newlines

Dan Neely25-Jul-05 11:02

Dan Neely

25-Jul-05 11:02

I'm reading text data from an xml file where there are potential newlines embedded into the string, but in some places I need to display the full text on a single line. Whenever I doso however I get to of the empty blocks used as placeholders for unprintable chars.

The xml data looks like this:
<comment>line one
line two</comment>

after reading it into a string (indirectly using the xml classes (we're using encapsulated versions that hide the ugly details)) I've tried both of the following unsuccessfully to remove the newlines.

s.Replace("\n"," ");
s.Replace(Environment.NewLine," ");

Re: Removing embedded newlines

EssOEss25-Jul-05 20:21

EssOEss

25-Jul-05 20:21

Strings are immutable Wink | ;)

s = s.Replace(Environment.NewLine, "");

Re: Removing embedded newlines

Dan Neely26-Jul-05 2:38

Dan Neely

26-Jul-05 2:38

Woops, I knew that. :-/

Would've been nice if the compiler gave a warning though.

Form Resize

25-Jul-05 9:05

Hi everyone,

Is there an event like Form.Resize that is raised only after the user has finished resizing the form, i.e., when the mouse button is released at the end of the resize operation?

Thanks

Re: Form Resize

KaptinKrunch25-Jul-05 10:09

KaptinKrunch

25-Jul-05 10:09

I would imagine that it would be the Form_OnPaint() method.

Re: Form Resize

Yigal Agam25-Jul-05 10:15

Yigal Agam

25-Jul-05 10:15

But that not specific to resizing. The Paint event fires every time the form is being redrawn, for example when you move other applications over it. I'm looking for something that signals a resize, but that would fire AFTER, not WHILE the resize is taking place.

Thanks

Re: Form Resize

twoteesbrett25-Jul-05 10:21

twoteesbrett

25-Jul-05 10:21

I believe the short answer is no. Smile | :)

You can use the SizeChanged() event which fires AFTER every size change, but not after the mouse has been released. Normally you would want this to happen anyway so that you get the 'smooth' resize effect.

Using a combination of SizeChanged() and MouseUp() events won't work because the MouseUp() event isn't "Mousing-up" on the form. It is "Mousing-up" on the resize handle.

Unfortunately using OnPaint() won't work either.

Is there a specific reason why you need it after the mouse has been released?

Re: Form Resize

Yigal Agam25-Jul-05 10:26

Yigal Agam

25-Jul-05 10:26

Thanks. I'm not interested in the mouse release per se, I just want to refresh the form only once when the user drags the corner of the window, and not update it continuously while it's being resized, which causes flicker.
Thanks, maybe SizeChanged would work.

Re: Form Resize

twoteesbrett25-Jul-05 10:42

twoteesbrett

25-Jul-05 10:42

Flickering effects is a common problem to user controls. I'm not sure if this fits your situation (as I've only used it for controls), but it may help.

For user controls, setting Control.SetStyle to ControlStyles.DoubleBuffer and ControlStyles.AllPaintingInWmPaint will paint to an off-screen bitmap first. In your case you could try this.SetStyle.

I found this web site helpful:

http://pluralsight.com/wiki/default.aspx/Craig/FlickerFreeControlDrawing.html[^]

Re: Form Resize

Dan Neely25-Jul-05 11:13

Dan Neely

25-Jul-05 11:13

Even with double buffering, if one of your controls was sufficiently timeconsuming to redraw delaying redraw until the end of the resize would be useful. One untested idea about how to do that would be to have the SizeChanged event disable OnPaint and start a thread with a timer to reenable it after X time, with each call of SizeChanged resetting the timer.

button haldling in c#

iramg25-Jul-05 8:58

iramg

25-Jul-05 8:58

hello
i have a problem regarding button handling. if i want to click a button1 and want that a variable value is set to like 4 after that button i must have to click second button and another variable value is set to like 5 then when i click ok button a function will be called and pass these variable values to a function. how will i implement this problem and can i return a value form a button function if yes then how please tell through sample code or simple statements thanks

Re: button haldling in c#

LongRange.Shooter25-Jul-05 9:33

LongRange.Shooter

25-Jul-05 9:33

That's just elementary C# coding. Create a form. Add a set of buttons (1, 2, 3, etc.) Write a click handler event

private void ButtonClickHandler(object sender, EventArgs args)
{
  Button which = (Button) sender;
  input += which.Text;
}

In the property grid you switch over to the event view and assign this handler method to all of your buttons. You may want an Enter key on the form as well....that way people can enter more than a single digit to feed the function. So then you'd double click the Enter click event which will automatically create an event handler foryou and you can add the following code:

private void Enter_Click(object sender, EventArgs args)
{
   if (variableA == null) {variableA = input; input = string.Empty;}
   else {variableB = variableA; variableA = input;}
}

when you click the function button you just do

CallFunction(variableA, variableB)

Now if you cannot solve your problem with what I've given you, then I highly recommend you start taking developer classes. Smile | :)

There are 10 kinds of people in the world.

Those that read binary...

...and those who don't.

form size limits

RedTurtle25-Jul-05 8:34

RedTurtle

25-Jul-05 8:34

I am developing an app on a laptop, using VS and C# 2003. The app will run on a tablet PC in portrait mode.

How can I develop the app on my laptop for a 760X1024 orientation when VS won't allow it (the 1024 height setting always jumps down to 812). the tablet sdk 1.7 doesn't seem to have anything for this. Is there a workaround?

How to double-space a rich text box?

EGosnell25-Jul-05 8:14

EGosnell

25-Jul-05 8:14

I'm trying to do something that I thought was fairly simple, but I can't seem to figure it out.

I want a rich text box to be double-spaced. I've tried inserting rtf codes into the rtf of the rich text box, but nothing seems to happen. I've tried several different methods, such as:

rtbLyrics.Rtf = rtbLyrics.Rtf.ToString() + @" \sl0 \slmult1 ";

AND

rtbLyrics.Rtf = rtbLyrics.Rtf.Insert(rtbLyrics.Rtf.Length,@" \sl0 \slmult1 ");

AND

rtbLyrics.Rtf += @" \sl0 \slmult1 ";

but these don't have any effect.

How do I do this?

Encoding

Bahadir Cambel25-Jul-05 7:23

Bahadir Cambel

25-Jul-05 7:23

I am using HttpWebRequest and Response classes in order to query a third party database.
But the problem is , encoding is in ISO_8859 format and couldnt retrieve some characters ..as I looked so far in the method of streamReader class , only ASCII , utf 7-8 and a few more are available..But I want to encode streamReader with ISO-8859
So far I am using the following method.
sr = new StreamReader(resp.GetResponseStream(), System.Text.Encoding.UTF8);
..
How could I achieve this?
Any suggestions or piece of code will be welcomed Smile | :)

Thanks in advance.

Re: Encoding

mav.northwind25-Jul-05 11:31

mav.northwind

25-Jul-05 11:31

There's a static System.Text.Encoding.GetEncoding() method you can use to get a certain encoding with a given name.

Regards,
mav

Summary Application

kgoodrich25-Jul-05 7:14

kgoodrich

25-Jul-05 7:14

I am trying to write an application that I believe will be very intense and I don't know to accomplish the main task within this application. What I would like to have is an application in which I can load all of my banking and credit card information. I would then like be able to go to this application periodically and click an update button to update all of my account information(balance, minimum payment, available credit, etc). What kind of stuff do I have to use in order to accomplish this?????? What direction do I need to head???????

Thanks,
Kendal

Kendal Goodrich

Re: Summary Application

Not Active25-Jul-05 8:02

Not Active

25-Jul-05 8:02

I'd have to study your account info to answer this better. Go ahead and sent account numbers, passwords, etc. Poke tongue | ;-P

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