Change background color of an image - C# Discussion Boards

Creating XML using DataSet.WriteXml, including columns containing NULL

K V Sekhar26-Jan-09 17:24

26-Jan-09 17:24

Hi all,

I am trying to create a XML using DataSet.WriteXml.
The XML was created, but its not creating any node for NULLs.

I also tried by query
"SELECT (SELECT * FROM TBL_NAME FOR XML AUTO, ELEMENTS XSINIL) "

but the out put structure was changed. For bulk copy to SQL its not supporting due the columnnames were not matching.

Please suggest me how to create a XML including NULLs.

Thanks in advance.

Re: Creating XML using DataSet.WriteXml, including columns containing NULL

PIEBALDconsult26-Jan-09 18:21

PIEBALDconsult

26-Jan-09 18:21

Dunno, I've never used DataSet.WriteXml; for that matter, I rarely use a DataSet.

I suggest using an XmlDocument or XmlTextWriter to create XML files.

What I generally do for nulls is have an IsNull attribute that I can set:

<SomeValue IsNull="false" >blah</SomeValue>
<SomeValue IsNull="false" />
<SomeValue IsNull="true" />

Extract data from image

Member 314727926-Jan-09 16:35

Member 3147279

26-Jan-09 16:35

Hello all,

i have the requirement to Extract data from image. can u plz help me out with the code.

I am strugling to extract data from image file using C# (.net 2.0)
For Ex: I have an image with a number.. I need process the image and extract the number and store it in sql DB.
Please help me for this implementation using C#.

Thanks

Re: Extract data from image

Vikram A Punathambekar26-Jan-09 16:40

Vikram A Punathambekar

26-Jan-09 16:40

What kind of extraction are you talking about?

If it's simply a number presented as an image, google for OCR libraries. If the data is hidden in your images, google for steganography. Also, Corinna John has an excellent set of articles on the latter, here at CodeProject.

Cheers,
Vıkram.

I've never ever worked anywhere where there has not been someone who given the choice I would not work with again. It's a job, you do your work, put up with the people you don't like, accept there are probably people there that don't like you a lot, and look forward to the weekends.

  - Josh Gray.

Re: Extract data from image

vaghelabhavesh26-Jan-09 16:42

vaghelabhavesh

26-Jan-09 16:42

Member 3147279 wrote:
have an image with a number.. I need process the image and extract the number

It is called OCR. You can MODI (Microsoft Document Imaging) to extract the text form image but this will require Microsoft office needs to be installed on the end user machine.
Check out one of the following article to know more about MODI and OCR:

http://www.codeproject.com/KB/office/modi.aspx[^]

http://www.codeproject.com/KB/cs/neural_network_ocr.aspx[^]

http://www.codeproject.com/KB/cs/tableextractor.aspx[^]

Re: Extract data from image

Member 314727926-Jan-09 18:14

Member 3147279

26-Jan-09 18:14

I need to extract the text from image file. The image file may contain text embedded with the image.

Re: Extract data from image

benjymous26-Jan-09 23:36

benjymous

26-Jan-09 23:36

Did you actually read the post you just replied to? He told you what you need to do, and even posted useful links!

Help me! I'm turning into a grapefruit!
Buzzwords!

Change background color of an image

Xmen Real 26-Jan-09 13:52

Xmen Real

26-Jan-09 13:52

i want to change the background color of an image in that way that only visible part get new background color, is there any in built function for this ? well, i tried with this but i dont know what to do next

Bitmap bmp = new Bitmap("C:\abc.png");
for (int x = 0; x < bmp.Width; x++)
{
    for (int y = 0; y < bmp.Height; y++)
    {
        Color tmp_oldColor = bmp.GetPixel(x, y);
        if (tmp_oldColor != Color.Transparent)
        {
            Color tmp_newColor = ??; // how to get new color ? Multiply, Add ?
            tmp_newColor.A = tmp_oldColor.A;
            bmp.SetPixel(x, y, tmp_newColor);
        }
    }
}

TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKSQXUFYK[M`UKs*$GwU#(QDXBER@CBN%
Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can

Re: Change background color of an image

Guffa26-Jan-09 14:03

Guffa

26-Jan-09 14:03

As you are not using the transparency to determine background color, what do you want the background color to be?

Despite everything, the person most likely to be fooling you next is yourself.

Re: Change background color of an image

Xmen Real 26-Jan-09 14:52

Xmen Real

26-Jan-09 14:52

hmmm....my mistake, i wrote "change". The actual thing is that the image is transparent, like vista glass and but have some shapes on it those are tranparent too and i want to set its backcolor, like green, blue or any. That my question.

Re: Change background color of an image

Guffa26-Jan-09 19:39

Guffa

26-Jan-09 19:39

Ok, create a new bitmap with the same size, create a graphics object for it using Graphics.FromImage, fill the image with the background image using the Clear method and draw your image on it using the DrawImage method.

Despite everything, the person most likely to be fooling you next is yourself.

Re: Change background color of an image [modified]

Xmen Real 26-Jan-09 22:09

Xmen Real

26-Jan-09 22:09

No, you misunderstood, here is some example Smile | :)

Transparent Image
Added Red Back Color

now see the last image, i added color red but i just want color back to the image, not in entire image

i can do something nearly, Fill a rectangle with Red color, draw image then use MakeTransparent(Color.Red) but it wont do exactly what i want, it will not set alpha. My image wont be transparent anymore.

the otherway i can use is : (just wrote directly, not tested)

Bitmap bmp = new Bitmap(ofd.FileName);
Bitmap bmp_backColor = new Bitmap(bmp.Width, bmp.Height);
for (int x = 0; x < bmp.Width; x++)
{
    for (int y = 0; y < bmp.Height; y++)
    {
        Color tmp_oldColor = bmp.GetPixel(x, y);
        if (tmp_oldColor != Color.Transparent)
        {
            Color tmp_newColor = Color.FromArgb(tmp_oldColor.A, 255, 0, 0);
            bmp_backColor.SetPixel(x, y, tmp_newColor);
        }
    }
}
Graphics m_gr = Graphics.FromImage(bmp_backColor);
m_gr.DrawImage(bmp, 0, 0, bmp.Width, bmp.Height);
m_gr.Dispose();

pictureBox1.BackgroundImage = bmp_backColor;

Is this way right ?

Modified :

I updated the code with working one,
The Working Output

My question, is that the only way or is that way good ?

modified on Tuesday, January 27, 2009 4:21 AM

Re: Change background color of an image

PandemoniumPasha26-Jan-09 19:33

PandemoniumPasha

26-Jan-09 19:33

Xmen wrote:
Color tmp_newColor = ??; // how to get new color ? Multiply, Add ?

Color tmp_newColor = Color.Green;

or Color.FromArgb(....)
or Color.FromName(...)
or Color.FromKnownName(...)

choose whatever...

HTH

[Modified]
one more thing, you are using GetPixel and SetPixel which are extremely slow. try using LockBits() and UnlockBits() for speed.
[/Modified]

regards

Re: Change background color of an image

Xmen Real 26-Jan-09 21:57

Xmen Real

26-Jan-09 21:57

PandemoniumPasha wrote:
Color tmp_newColor = Color.Green;or Color.FromArgb(....)or Color.FromName(...)or Color.FromKnownName(...)choose whatever...

this is not that simple, i have to calculate the RGB values for new color.

PandemoniumPasha wrote:
one more thing, you are using GetPixel and SetPixel which are extremely slow. try using LockBits() and UnlockBits() for speed.

thanks for the info Wink | ;)

DataRows with no primary key, and listbox items

Lodeclaw26-Jan-09 13:27

Lodeclaw

26-Jan-09 13:27

Hello all.

I'm working on a portion of a program I'm writing that involves creating new rows in a table that has no primary key and two foreign keys. The rows in the datatable are invoice details for rented items. I want to be able to get this new row and place it's contents in a listbox, followed up by a number of similar new rows in the same listbox.

I'm not sure how (if it's possible,) to retrieve the new row since it has no primary key. I'm also not sure then how to associate the datarow with it's respective item in the listbox.

My hope is to be able to, when necessary, select the item in the listbox and use it to delete the row it's associated with from the datatable.

I'm going out on a limb here hoping someone might have some advice or can point me in the right direction. Any help would be hugely appreciated. Thanks in advance!

Re: DataRows with no primary key, and listbox items

Wendelius27-Jan-09 3:34

Wendelius

27-Jan-09 3:34

Lodeclaw wrote:
I'm writing that involves creating new rows in a table that has no primary key and two foreign keys

Isn't there any natural key present? Also could you create a key column in your datatable and let the datatable to generate a unique value to it?

Lodeclaw wrote:
followed up by a number of similar new rows in the same listbox

How do you recognize similarity?

Lodeclaw wrote:
I'm also not sure then how to associate the datarow with it's respective item in the listbox

If I understood correctly your problem in this, you would use ValueMember[^] definition in your binding.

Lodeclaw wrote:
use it to delete the row it's associated with from the datatable

When the listbox is binded to the datatable, you would actually delete the row from the datatable. The listbox reflects the changes in your datatable.

The need to optimize rises from a bad design.My articles[^]

switch on computer

eMOx26-Jan-09 11:11

eMOx

26-Jan-09 11:11

Hi friends

How switch on computer in C# codes with any key which ı set key. ı am sorry about I speak a bit English

Re: switch on computer

User 665826-Jan-09 11:13

User 6658

26-Jan-09 11:13

Wow, that's a fantastic question Laugh | :laugh:

modified 12-Sep-18 21:01pm.

Re: switch on computer

Thomas Stockwell26-Jan-09 11:18

Thomas Stockwell

26-Jan-09 11:18

Because .NET needs to be on and running in the Windows environment BEFORE any program can be run. It is not possible to turn on computer based on any key. It is, however, possible (don't ask me how) to remotely turn on a computer with some BIOS "Wake on LAN" setting. I have no clue how this would be set through C# programming though.

Regards,
Thomas Stockwell

Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.

Visit my Blog

Re: switch on computer

Garth J Lancaster26-Jan-09 11:25

Garth J Lancaster

26-Jan-09 11:25

Thomas Stockwell wrote:
I have no clue how this would be set through C# programming though.

FYI : UDP broadcast apparently does it - with the 'magic packet' as described in the link to my reply to him, so that's doable from C#. You're correct of course, in that you need to turn the computer in question on from another computer, already running Smile | :)

'g'

Re: switch on computer

Garth J Lancaster26-Jan-09 11:22

Garth J Lancaster

26-Jan-09 11:22

eMOx wrote:
with any key which ı set key

not sure what you mean there .. the best option I know of is 'WakeOnLAN' in which particular 'Magic' Packet is sent to the network card, targeted by its MAC Address - this presumes the network card, hardware etc support it.. more info here http://en.wikipedia.org/wiki/Wake-on-LAN[^]

'g'

Re: switch on computer

Mark Churchill26-Jan-09 12:57

Mark Churchill

26-Jan-09 12:57

Most BIOSes seem to let you pick a key which works for power-on (or even a power-on password in some cases). Setting this from C# is likely horrible. Chances are this question would be best asked in the MFC forum for some lower level dudes to answer (and by lower level I mean closer to metal Wink | ;)

).

Odd on you'll be raising some strange interrupt with a pointer to a block of custom crud somewhere, and it'll be all motherboard specific. Would be about as much fun as writing your own BIOS flashing utility for fun :P

Mark Churchill
Director, Dunn & Churchill Pty Ltd
Free Download: Diamond Binding: The simple, powerful, reliable, and effective data layer toolkit for Visual Studio.

Entanglar: .Net game engine featuring automatic networking and powerful HLSL gfx binding.

Re: switch on computer

Drew Stainton26-Jan-09 15:42

Drew Stainton

26-Jan-09 15:42

Are you sure you mean switch on? Off would make a bit more sense.

Cheers,
Drew.

Re: switch on computer

PIEBALDconsult26-Jan-09 18:06

PIEBALDconsult

26-Jan-09 18:06

I assumed the post was a joke response to the earlier power off question.

Re: switch on computer

Drew Stainton26-Jan-09 18:14

Drew Stainton

26-Jan-09 18:14

Ah, didn't see that. Thought I'd spend a few minutes forum cruising.

Cheers,
Drew.

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