C# Discussion Boards - CodeProject

Guffa19-Dec-05 9:03

19-Dec-05 9:03

FxCop generally gives good advice, so also in this case. There is very seldom any need for out or ref parameters. When they are used it's sometimes for performance reasons but mostly out of laziness.

The ones that don't understand why FxCop alerts on this, is the ones that are most likely to misuse out or ref parameters. If you don't know why you shouldn't use it, you can't tell when it would be acceptable.

MrEyes wrote:
IMHO if somebody is working on the code and is unlikely to understand then they should learn.

Thankfully the framework is not designed under that philosophy. Wink | ;)

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Howto raise the GotFocus event from inside a custom control ?

smoitry19-Dec-05 5:05

smoitry

19-Dec-05 5:05

Hi all !

I've got a problem : I created a custom control, which contains a textbox. At runtime, when I click inside the textbox, the "GotFocus" event of my customcontrol is not fired. So, I would like to add method to handle the textbox's GotFocus event, and then fire the GotFocus event of my Custom Control, so it can be handled in the application that use it ...

Or, the GotFocus event is inherited from the Control class, and I can't find the evenhandler to call ... How can I achieve this ?

Thanks ! Wink | ;)

Stéphane

Re: Howto raise the GotFocus event from inside a custom control ?

microsoc19-Dec-05 15:15

microsoc

19-Dec-05 15:15

hi!

you can add an eventhandler for gotfocus event on your textbox then on that handler, you can call the OnGotFocus protected method of your custom control.This will trigger the GotFocus event of your custom control.

<br />
private void textbox_gotfocus(object sender, EventArgs e)<br />
{<br />
  OnGotFocus(e);<br />
}<br />

Or instead of calling the protected method, you can shadow the event then manually trigger it on the eventhandler of your textbox.

<br />
public new event EventHandler GotFocus<br />
<br />
<br />
private void textbox_gotfocus(object sender, EventArgs e)<br />
{<br />
  if (GotFocus != null)<br />
  {<br />
    GotFocus(this, e);<br />
  }<br />
}<br />
<br />

hope this helps! Smile | :)

Re: Howto raise the GotFocus event from inside a custom control ?

smoitry19-Dec-05 20:26

smoitry

19-Dec-05 20:26

This works so fine ! Thank you so much ! Big Grin | :-D

Re: Howto raise the GotFocus event from inside a custom control ?

microsoc20-Dec-05 14:34

microsoc

20-Dec-05 14:34

okidoki!

No problemo! Cool | :cool:

unreachable objects

adafaaa19-Dec-05 5:03

adafaaa

19-Dec-05 5:03

hi,
what is an UNREACHABLE object?

thnx.

Re: unreachable objects

J4amieC19-Dec-05 5:19

J4amieC

19-Dec-05 5:19

An object that cannot be reached.

eg, you may have a return statement before a call to new MyObject() - in which case the instance of MyObject could be considered "Unreachable"

Re: unreachable objects

Dave Kreskowiak19-Dec-05 8:20

Dave Kreskowiak

19-Dec-05 8:20

An instance that cannot be accessed on any code path. Basically, an object that has no references to it or has fallen out of scope.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

System.Net.WebClient loses international characters

malharone19-Dec-05 4:56

malharone

19-Dec-05 4:56

I'm using System.Net.WebClient to download HTML from Google's translation page. However, when I do that, the text downloaded is losing international/accented characters. I tried all of the various Encodings. UTF8 is the most promising of all. Unicode only has garbled characters.

System.Net.WebClient wc = new System.Net.WebClient();<br />
string url = "http://translate.google.com/translate_t?text=Hello World&langpair=en%7Czh-CN";<br />
byte[] bytes = wc.DownloadData(url);<br />
string data= System.Text.Encoding.UTF8.GetString(bytes);

The same code works (e.g. all the characters are preserved) if I substitute "en%7Czh-CN" (English to Chinese) with "en%7Cfr" (English to French).

I also tried the solution from http://www.eggheadcafe.com/articles/20050725.asp[^] but even that has the same results.

I'm displaying my string data in a multi-line textbox with Arial Unicode MS font -- which does support displaying of these characters. The textbox shows the text properly if I manually copy and paste the Chinese characters from Google's webpage into my program.

Any suggestions / tips?

Thanks much.

- Malhar

datagrid mousedown

melanieab19-Dec-05 4:43

melanieab

19-Dec-05 4:43

Hi,
I have a datagrid, and when I click on a cell, the backcolor and forecolor change while the mouse is still down. When I release the button, it turns back to normal. Is there any way to avoid the color change?
Thanks!
Mel

Re: datagrid mousedown

microsoc19-Dec-05 16:57

microsoc

19-Dec-05 16:57

hi melanieab! Smile | :)

what do you want to avoid, changing its color when the mouse is down? if ever, i suggest that you just make the selectionbackcolor and selectionforecolor same as the backgroundcolor and forecolor properties.

hope this solve your problem! Smile | :)

-- modified at 22:58 Monday 19th December, 2005

Re: datagrid mousedown

melanieab20-Dec-05 10:58

melanieab

20-Dec-05 10:58

Hi!
The problem is, I do have selectionforecolor and selectionbackcolor the same as forecolor and backcolor. When I let go of the mouse, the selected row is how I want it to be, it's just during the mousedown where the background and text turn what look like some default colors (control). And it's only the first time that I click on the cell that this happens. If I continue to click on it (without clicking on another cell in the meantime) the colors are just the way I want them to be.
Any ideas??? At the moment, I'm trying to make a whole new custom datagrid in the hopes that it won't have this issue. But it's going slowly, and I don't even know if it will work.
Confused | :confused:

Mel

Template Matching

Seraphin19-Dec-05 4:19

Seraphin

19-Dec-05 4:19

Currently, I am working on an OCR solution where a camera push video frames into the application. One task is template matching where I try to find a bitmap within a bitmap.

1)Is template matching worth the work related to performance (Resolution 1024x768 - 24 Bit)?
2)Are there any information or resources for this subject on the web? Google show only rare information about it.

thx

Re: Template Matching

Curtis Schlak.19-Dec-05 18:31

Curtis Schlak.

19-Dec-05 18:31

If you are looking for similar bitmaps contained in other bitmaps, then I suggest you start by looing at the Hausdorff distance. This can get computationally intensive.

If you feel comfortable with complex analysis, though, you might want to look into Jacek Turski's Geometric Fourier Analysis of the Conformal Camera for Active Vision. You can compute the convolution of the Fourier transforms of the complex transformation that he describes to evaluate similarities. His system models a foveated camera, though; if you don't need that, maybe just vanilla Fourier transforms and convolution computation would work.

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Problem in Crystal Report open in Windows XP

joy_priyank19-Dec-05 4:08

joy_priyank

19-Dec-05 4:08

Hello dear all
i am facing a problem in crystal report. that crystal report is working well in windows 200 server but not working in windows XP. i have created one cystal report in .NET C#. this is giving error when i open this crystal report in windows XP operating system. it display a one dilaog and get user name and password. in my sql server 2000 i have set SQL Server Authentication and when i open that report then it display a dialog. this dialog does not display in windows 2000 operating system. i use same SQL Server Authentication in SQL Server 2000.

please help what can i do for this issue

Priyank Gupta

.Net c# form inheritance

nkabiloglu19-Dec-05 2:51

nkabiloglu

19-Dec-05 2:51

I have a problem with form inheritance in .Net 2005.

When I add a control to the new form which is inherited from base form, I couldn't change its size by mouse, I only change it by using shift and arrow keys or by changing value of size from properties dialog box.

Is there any solution of this problem?

How can I filter Windows Messages for my UserControl.

User 209307319-Dec-05 1:45

User 2093073

19-Dec-05 1:45

Dear friends,
I have a UserControl with an ActiveX control Filled in it.In fact this is a simple .NET wrapper for this COM component. I want to filter windows messages JUST for my control and prevent the COM component to receive Right Click events.
Note that I don't want to use from Application.AddMessageFilter to filter messages in all application scope. I want to prevent this message JUST in my user control.

The importatnt note is that,this OCX doesn't handle .NET MouseClick event.

Thanx...

[ _ Always there is another way _ ]

Re: How can I filter Windows Messages for my UserControl.

S. Senthil Kumar19-Dec-05 5:00

S. Senthil Kumar

19-Dec-05 5:00

Override WndProc[^]?

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Substring operation

hasanali0019-Dec-05 1:08

hasanali00

19-Dec-05 1:08

hi
I wonder of someone can help me with this Substring operation.

I have : "12.10" or "120.10"

Now I want to convert these values to : "1210" or "12010"

Basically, I want to removce the dot within my strings. How can I do this.?

Thanks

Re: Substring operation

Guffa19-Dec-05 1:16

Guffa

19-Dec-05 1:16

Locate the dot and get the string before and after:

int pos = myString.indexOf('.');<br />
string newString = myString.Substring(0, pos) + myString.Substring(pos + 1);

Or why not simply replace the dot?

string newString = myString.Replace(".", string.Empty);

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Re: Substring operation

Yulianto.19-Dec-05 2:44

Yulianto.

19-Dec-05 2:44

Or using Trim

<italic>Work hard, Work effectively.

Re: Substring operation

Guffa19-Dec-05 2:51

Guffa

19-Dec-05 2:51

Trim only removes characters from the beginning or end of a string.

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Re: Substring operation

Yulianto.22-Dec-05 13:31

Yulianto.

22-Dec-05 13:31

From http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemstringclasstrimtopic.asp[^]
Trim -> Removes all occurrences of a set of characters specified in an array from the beginning and end of this instance.

So far, maybe I use Trim only to remove the occurrence at the end of the instance. Damn, I thought it was from the beginning to the end of this instance Poke tongue | ;-P

<italic>Work hard, Work effectively.

Re: Substring operation

albCode19-Dec-05 4:10

albCode

19-Dec-05 4:10

the best solution is Guffa's answer

string sub = "12.10";
MessageBox.Show(sub.Replace(".",string.Empty));

result is 1210

Fast reading of unmanaged buffers.

Pixinger7719-Dec-05 0:22

Pixinger77

19-Dec-05 0:22

Hi all,

I'm working in C# with a unmanged Dll that provides me a pointer to a byte buffer (768x576) that holds some video data. Is there any fast way to access the data and work e.g. with a bitmap object?
Currently I'm converting the data by the help of: System.Runtime.InteropServices.Marshal.ReadByte
But that is to slow for me.

Any suggestions?

Thanks,
Snow.

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