losing resolution when using PNG as background image - C# Discussion Boards

richtext box retaining color information

SHINOJK12-Jul-08 1:43

12-Jul-08 1:43

Hi All,

i have made a chat application i have 2 richtext boxes that are rtblog and rtbmessage on the client side. i also have a toolbar that allows you to change color,font ,font style.now when client A changes the color of text and sends to client B.client B still gets the message in the default color(black) instead of changed color(blue or some other color).so how can i fix that.Thanks in Advance

Re: richtext box retaining color information

Elroy Dsilva12-Jul-08 2:18

Elroy Dsilva

12-Jul-08 2:18

You need to send the formatting information to the other client with your text. How will the client B understand what your formatting was?

Change the sent message structure to include format information.

Re: richtext box retaining color information

SHINOJK12-Jul-08 4:15

SHINOJK

12-Jul-08 4:15

Hi,
Thanks for ur valuable information,So i need to send text wit RTF information...
one more question here....
How can i append a richtextbox with content of another richtextbox with RTF property...?

RichTextBox1.RTF += RichTextBox2.RTF something like this.....
but that code is not working.....

Thanks in Advance..
Shinoj

Re: richtext box retaining color information

Elroy Dsilva12-Jul-08 4:26

Elroy Dsilva

12-Jul-08 4:26

The code isn't working cos' it's wrong.

SHINOJK wrote:
RichTextBox1.RTF += RichTextBox2.RTF

I don't know what exactly you need but, i suggest you to let your client B understand what formatting had been done on client to the text.

For example,
If I formatted my text to bold + italic + red, I would send the plain text along with formatting information(Color : Red, Bold : Yes, Italic : Yes, Underlined : No, ...) to the client B. Then it's client B's job to render it. Something like that.

Re: richtext box retaining color information

mav.northwind12-Jul-08 4:59

mav.northwind

12-Jul-08 4:59

Hi!

Since you already do have the vehicle of RTF formatted text, I really don't think that sending text and formatting information separately is a good idea.

Simply appending the Rtf content of one RTB with the content of another one won't work because of the way RTF works.
Basically, it's just regular text starting with {\rtf1 and containing all kinds of formatting tags (similar to html). When you simply append another RTF formatted text, the initial \rtf1 will appear twice, violating the format specification. You can google for the RTF specification if you need further details.

The trick is to use the SelectedRtf property to insert RTF at a given position, like in this example:

// given 2 RTB's named rtb1 and rtb2
string rtb1Content = rtb1.Rtf;
// put the selection at the end of rtb2
rtb2.Select(rtb2.Text.Length, 0);
// insert rtb1's RTF at the current selection in rtb2
rtb2.SelectedRtf = rtb1Content;

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: richtext box retaining color information

SHINOJK12-Jul-08 6:38

SHINOJK

12-Jul-08 6:38

Thanks alot...mav
that was an great solution.....
Thanks alot .........

Re: richtext box retaining color information

Mostafa Siraj12-Jul-08 5:16

Mostafa Siraj

12-Jul-08 5:16

Simply you can encapsulate the color used by the client with his message -that's the simplest solution
e.g.
Class Message
{
String message;
Color color; //or in general message properties
}

another possible solution is to send a notification to Client B whenever Client A changes his color this will save your bandwidth -not to send each time the color while it was changed for only one time-

I hope that helps you.
Good Luck

losing resolution when using PNG as background image

Mostafa Siraj12-Jul-08 0:11

Mostafa Siraj

12-Jul-08 0:11

Hi all,
I have a PNG image -with very high resolution- I want to use it as background image for my form and make the form transparent. the problem is when I do that I lose the resolution, I tried to use PictureBox but I still have the same problem

so the question is.

How to solve this problem

or

if I'm using the wrong way, how can I build a form with the look I want from PNG image -I care for the image to be PNG to have the shape I want for the form-

Thanks in Advance
really appreciate your help.

Re: losing resolution when using PNG as background image

User 665812-Jul-08 0:36

User 6658

12-Jul-08 0:36

What do you mean by "losing resolution"? The PNG format is lossless. Do you have a screenshot of your application?

regards

modified 12-Sep-18 21:01pm.

Re: losing resolution when using PNG as background image

Mostafa Siraj12-Jul-08 1:30

Mostafa Siraj

12-Jul-08 1:30

this is the original image before using it in the form

http://img27.picoodle.com/img/img27/4/7/12/f_OriginalImam_f44b121.png

this is after I use it as a background image in the form

http://img34.picoodle.com/img/img34/4/7/12/f_Thisisafterm_5d8b51e.jpg

how can I keep the good resolution at the first when I use it as a background image for my form???

Thanks

Re: losing resolution when using PNG as background image

Gareth H12-Jul-08 1:37

Gareth H

12-Jul-08 1:37

Mostafa Siraj,

Voting someones answer as bad, wont get you much help if its a valid response.

Regards,
Gareth.

(FKA gareth111)

Re: losing resolution when using PNG as background image

Luc Pattyn12-Jul-08 3:19

Luc Pattyn

12-Jul-08 3:19

Hi Gareth,

the 1 vote may be due to the (IMO stupid) voting change: instead of having 1 to 5 options, a reply
now only has "helpful" and "not helpful". Well, replying with one or more questions is strictly
speaking NOT helpful.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

Re: losing resolution when using PNG as background image

User 665812-Jul-08 3:31

User 6658

12-Jul-08 3:31

Luc Pattyn wrote:
Well, replying with one or more questions is strictly
speaking NOT helpful.

If I need more information to help the OP because his question was lacking some important facts, then I don't see how asking for more information is a bad answer.

regards

modified 12-Sep-18 21:01pm.

Re: losing resolution when using PNG as background image

Luc Pattyn12-Jul-08 4:24

Luc Pattyn

12-Jul-08 4:24

I agree with your questions.
it is not bad.
but literally speaking it is not helpful, it did not solve his problem!

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

Re: losing resolution when using PNG as background image

Luc Pattyn12-Jul-08 3:21

Luc Pattyn

12-Jul-08 3:21

Hi,

your two images have different sizes, so something is scaling down (and harming quality while doing that).

Possible culprits:
- you have a PictureBox and have set the display mode to "Scale";
- you have a system with a non-standard dpi setting (default is 96dpi, somewhere deep down in
Display Settings, you can increase that number, resulting in some strange effects).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

Re: losing resolution when using PNG as background image

Mostafa Siraj12-Jul-08 7:31

Mostafa Siraj

12-Jul-08 7:31

about the 2 suggestion

-the display mode for the PictureBox is in "Scale" already
-I created in photoshop photos with dpi up to 5000 and all of them just turn to the bad resolution as soon as I put them in the application Frown | :(

(

Re: losing resolution when using PNG as background image

Luc Pattyn12-Jul-08 7:38

Luc Pattyn

12-Jul-08 7:38

Hi,

what is the value of PictureBox.SizeMode?
you might want to show all the code relating to the PictureBox.
Any chance of publishing the actual PNG file, so we could experiment a bit with it?

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

Re: losing resolution when using PNG as background image

Mostafa Siraj12-Jul-08 7:47

Mostafa Siraj

12-Jul-08 7:47

this is the PNG file (it was already published)

http://img27.picoodle.com/img/img27/4/7/12/f_OriginalImam_f44b121.png

this is after I use it as a background image in the form

http://img34.picoodle.com/img/img34/4/7/12/f_Thisisafterm_5d8b51e.jpg

I tried SizeMode=StretchImage && also I tried SizeMode=Zoom
and both still have the same bad resolution

Re: losing resolution when using PNG as background image

Luc Pattyn12-Jul-08 8:28

Luc Pattyn

12-Jul-08 8:28

Hi,

I can paint your PNG image on a Panel at different scales and it always looks good.

Your JPG captured image has several anomalies:
- where is the little close box coming from (top, almost right)?
- seems like it was first scaled down a lot, then scaled up again.
could it be the image gets loaded while the PictureBox is small, then the PB size gets increased
but the image itself is no longer available? or something similar?

Anyway I wouldn't trust a PictureBox much, and do my own scaling, hence SizeModes Normal and AutoSize
have my preference.

Have you been playing around with alpha channel, transparency?

Tell us the entire story, and show us some code.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

Re: losing resolution when using PNG as background image

User 665812-Jul-08 3:28

User 6658

12-Jul-08 3:28

Looks like the PictureBox is scaling and compressing the image in some way. What I would suggest is scaling the image to the correct size that will be used in the application using a program like Photoshop or Paint.NET. These use proper resizing algorithms that don't produce such a edgy result by using some sort of anti-aliasing.

As for the second image, I don't know where the compression artifacts suddenly come from as a PictureBox does support PNG images. I guess this is just because you used the jpg format to save the screenshot.

regards

modified 12-Sep-18 21:01pm.

Re: losing resolution when using PNG as background image

Mostafa Siraj12-Jul-08 7:26

Mostafa Siraj

12-Jul-08 7:26

Actually I generated the png file from Photoshop and it generates as you see a very good results but the problem is when I'm using it as a background image, it looses its resolution, and no the bad resolution at the second page is not because of the screen shooting it's the look of the form I have.

no one face such a problem before I thought that it's common, how do you create your forms???

Passing C# exception through COM to get _com_error

Green Fuze11-Jul-08 22:57

Green Fuze

11-Jul-08 22:57

Hey everybody!

I wrote a COM visible C# dll for my application, and everything works great (Thanks to one of code project's articles of course! Smile | :)

)

I'm using this C# COM from a C++ application (not .Net).

The is in the error handling. Exceptions don't go through from the C# COM to the C++ (like _com_error).
Right now I'm passing a parameter that will store the error, if there is one.

So, What I want to know is, is there is a way to make the exceptions is C# be thrown back to the C++?

Thanks!!!

draw address dynamically

ham rez11-Jul-08 22:41

ham rez

11-Jul-08 22:41

hello
how can i draw address dynamicaly in c# similar paint brush
(draw line,rectangle,text,...)

Re: draw address dynamically

Abhijit Jana11-Jul-08 23:25

Abhijit Jana

11-Jul-08 23:25

ham rez wrote:
how can i draw address dynamicaly in c# similar paint brush

what does it mean ? Confused | :confused:

ham rez wrote:
(draw line,rectangle,text,...)

using System.Drawing

cheers,
Abhijit

Newbie question: single/multiple method arguments

Metal7611-Jul-08 22:34

Metal76

11-Jul-08 22:34

Stupid question, I admit, but I'm quite new to C#: how can I write a method which accepts a single input parameter or a collection (e.g. array) of this parameter?

For example, let's say I have the method void MyMethod(int[] args). If I try to call the function with a single argument, like MyMethod(1234), the compiler obviously throws an error (int != int[]).

Overloading surely solves the issue (i.e. defining both void MyMethod(int[] args) and void MyMethod(int arg) and factoring out the common behaviour in a different private method) but is there a simpler way to do this?

Regards,
Andrea

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