Re: Help with GDI+ - C# Discussion Boards

User 66585-Sep-06 8:54

5-Sep-06 8:54

There are already some articles on this site that explain it very well. Just type "Mono" into the search box at the top. Smile | :)

Here are two vey good ones:
Number 1
Number 2

regards

modified 12-Sep-18 21:01pm.

Re: cs project to Linux

Amar Chaudhary5-Sep-06 9:01

Amar Chaudhary

5-Sep-06 9:01

Greeeg

Thank You

Help with GDI+

Fco. Javier Marin5-Sep-06 7:58

Fco. Javier Marin

5-Sep-06 7:58

Hello. Is there any way to read one by one the pixels that contains a Graphics class and know his color? And I can replace these color to other different?

Thanks.

Re: Help with GDI+

Jun Du5-Sep-06 8:08

Jun Du

5-Sep-06 8:08

Yes, Bitmap.GetPixel/SetPixel methods.

Best,
Jun

Re: Help with GDI+

Fco. Javier Marin5-Sep-06 8:17

Fco. Javier Marin

5-Sep-06 8:17

But how I can convert the Graphics class into a Bitmap class?

Re: Help with GDI+

User 66585-Sep-06 8:21

User 6658

5-Sep-06 8:21

A graphic doesn't contain any pixel information per se. It's a Brush, Image or Bitmap that holds some pixels

regards

modified 12-Sep-18 21:01pm.

Re: Help with GDI+

Fco. Javier Marin5-Sep-06 8:26

Fco. Javier Marin

5-Sep-06 8:26

Yes, I need to replace the white pixel that appears in a Graphics class of a Print event, and I can´t create a Bitmap class.

Re: Help with GDI+

Jun Du5-Sep-06 9:27

Jun Du

5-Sep-06 9:27

This is what I see could be done:

1) Create and maintain a Bitmap object as the drawing buffer (canvas)
2) Construct a Graphics object from the Bitmap (optional)
3) Use that Graphics object to draw to the Bitmap (optional)
4) Change the colors of pixels to the Bitmap
5) Finally, use the Graphics object from the PaintEventArgs to draw the Bitmap to the screen

Hope this helps.

Best,
Jun

Re: Help with GDI+

User 66585-Sep-06 8:13

User 6658

5-Sep-06 8:13

If you have a Bitmap-Object, then you can use GetPixel() and SetPixel().
But both are very slow if you plan to use it on many pixels.
Use LockBits() and UnlockBits instead.

regards

modified 12-Sep-18 21:01pm.

Re: Help with GDI+

Amar Chaudhary5-Sep-06 8:53

Amar Chaudhary

5-Sep-06 8:53

please go through articles posted by

'Andrew Kirillov'

they cover a whole lot of the things

Treeview and add node/refresh

Saamir5-Sep-06 7:45

Saamir

5-Sep-06 7:45

Hi guys,
I need some help please, I have a treeview with menu items where one of them opens an add form and allows the user to select a name. Once the name is selected and saved into the database, I would like to update/refresh the tree with the new node automatically on save.

Please help!

sasa

Re: Treeview and add node/refresh

User 66585-Sep-06 8:20

User 6658

5-Sep-06 8:20

SASA_1 wrote:
I would like to update/refresh the tree with the new node automatically on save.

You mean when your app starts it should restore the treeview?
You could additionaly save your username like that: users/admins/tony (depends on your structure of course)

You can then recursively call Node.Expand to restore your tree view.
Here's some sample code from a project I work on:

private void ExpandTree(string path)
        {
            path = path.Replace(@"\\", @"\");
            string[] paths = path.Split('\\');
            if (paths.Length > 0)
            {
                TreeNodeCollection currentNodePath = this.trTreeView.Nodes;
                TreeNode currentNode = currentNodePath[0];
                for (int i = 0; i < paths.Length; i++)
                {
                    foreach (TreeNode node in currentNodePath)
                    {
                        if (node.Text.ToLower() == paths[i].ToLower())
                            {
                                node.Expand();
                                currentNodePath = node.Nodes;
                                currentNode = node;
                                break;
                            }
                        }
                    }
                }
            }

You might need to modify it for you needs, though.

regards

modified 12-Sep-18 21:01pm.

Re: Treeview and add node/refresh

Saamir5-Sep-06 8:40

Saamir

5-Sep-06 8:40

Thank you for your suggestion but, my app does restore the treeview when I restart the app, I just want it to restore the treeview on every node added after it is started.

sasa

Re: Treeview and add node/refresh

Nader Elshehabi5-Sep-06 10:42

Nader Elshehabi

5-Sep-06 10:42

Hello

I don't seem to fully understand your problem. how do you populate your TreeView? I usually make a RefreshTree() that populates my TreeView, and call it each time a change happens. So refresh your TreeView just in the same manner you populate it the first time!!

Again I think I'm not aware of your true problem. Please post me more details on how you populate you TreeView, and if there is any Databinding involoved, or do you explicitly populate you TreeView from a DataSource without binding.

Regards

Compile Question

HahnTech5-Sep-06 6:06

HahnTech

5-Sep-06 6:06

How do you compile to a library in C#. or how can i bring a DLL into the final exe so I don't have to install the dll.

I have classes that i use often and don't like just copying the .cs into my project. I'd like a library to link from but don't know how to make it.

Thanks

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: Compile Question

User 66585-Sep-06 6:17

User 6658

5-Sep-06 6:17

HahnTech wrote:
How do you compile to a library in C#

Create a class library project and just compile it Wink | ;)

HahnTech wrote:
or how can i bring a DLL into the final exe so I don't have to install the dll.

copy the code over from the DLL to your form.
This is ugly, the better way is:

HahnTech wrote:
I'd like a library to link from but don't know how to make it.

Add a reference to your DLL from your form.
In the solution explorer there a folder called "References". You can there rightclick, "Add Reference" -> "Browse" -> select your DLL

regards

modified 12-Sep-18 21:01pm.

Re: Compile Question

HahnTech5-Sep-06 12:08

HahnTech

5-Sep-06 12:08

I can make a DLL by using the create a class library project. And i can add a made dll as a reference into a new project but then i have to push the dll with the exe all the time. In C++ i can compile to a *.lib and tell the linker where the lib file is and it will compile the code from the lib into the exe and i don't need to push the lib all over the place. Is that possible in C#?

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Re: Compile Question

S. Senthil Kumar5-Sep-06 17:59

S. Senthil Kumar

5-Sep-06 17:59

You're looking for ILMerge[^].

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Compile Question

HahnTech5-Sep-06 18:31

HahnTech

5-Sep-06 18:31

Yes I am!
Thank you!

Ronald Hahn, CNT - Computer Engineering Technologist

New Technologies Analyst

HahnTech Affiliated With Code Constructors
Edmonton, Alberta, Canada
Email: rhahn82@telus.net

Hide Windows Application in System Tray?

MudkiSekhon5-Sep-06 5:12

MudkiSekhon

5-Sep-06 5:12

I want to hide my Windows Application in System Tray on minimizing. How can I do that? The user may be able to maximize the Application on clicking the icon in System tray. Please give me suggestion of how to do that?

Thanks,
Sandeep S. Sekhon

Re: Hide Windows Application in System Tray?

Stefan Troschuetz5-Sep-06 5:23

Stefan Troschuetz

5-Sep-06 5:23

Some threads below you find a description how to capture the minimizing of your form. Then you only need to call Form.Hide, set Form.ShowInTaskBar false and call Show of a NotifyIcon component dropped on your form at design time. To show your app again register to the NotifyIcon.Click event and reverse the steps described above.

"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." - Rick Cook

www.troschuetz.de

Is there bidirectional iterator in C#

AndriyZZ5-Sep-06 5:11

AndriyZZ

5-Sep-06 5:11

Hello

Is there bidirectional iterator(it is desirable for generics) in C#? (May be third party implementation).

Andriy

Re: Is there bidirectional iterator in C#

Not Active5-Sep-06 7:28

Not Active

5-Sep-06 7:28

There isn't one that I can recall, however, it is relatively easy to make one using the yield keyword in 2.0

only two letters away from being an asset

Re: Is there bidirectional iterator in C#

AndriyZZ5-Sep-06 9:37

AndriyZZ

5-Sep-06 9:37

Mark, thank you for advice. I think you've meant smth like this:
public IEnumerator<t> GetEnumerator() {
if (left != null) foreach (T x in left) yield x;
yield value;
if (right != null) foreach (T x in right) yield x;
}

But I need calling "MoveNext" and "MovePrevious" in arbitrary order e.g.: "MoveNext", "MoveNext", "MoveNext", "MovePrevious", "MoveNext", "MoveNext".

If you know how to implement discribed behaviour using "yield" please write small code snippet. I haven't found how to do it after investigating C# Specification describing "yield".

I think possible solution can be wrapping LinkedList.
What do you think about this?

Re: Is there bidirectional iterator in C#

Not Active5-Sep-06 9:49

Not Active

5-Sep-06 9:49

Try this How to: Create an Iterator Block for a Generic List[^]

only two letters away from being an asset

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