Re: Problem about MDI child form in C# - C# Discussion Boards

11-Mar-16 23:54

I have a mainform (MDI form) and I have another form (Form1) that includes a picturebox and I draw some lines that change acording to my parameters on it. Then I try to open it as mdichild form. However, I obtain the same drawn lines for every child form, How can I get different instance form in for loop?

I wrote this code main form (MDI parent form) (C# Windows Forms Application)

for (int i = 0; i <= 10; i++)
{
Form1 diagram = new Form1(Group, Paradigm, Method, stimChoise, frequncyChoise);
diagram.MdiParent = this;
diagram.Show();
}

In Form 1, I wrote these
public Form1(string group, string paradigm, string method, string stimChoise, string frequncyChoise)
{
InitializeComponent();
showDiagrams(group, paradigm, method, stimChoise, frequncyChoise);
//this function calls pictureBox1.Paint event that draw lines somewhere
}
Thanks in advance!

modified 12-Mar-16 6:19am.

Richard MacCutchan12-Mar-16 0:03

Richard MacCutchan

12-Mar-16 0:03

Where is the code that draws on the 11 child forms?

guest8012-Mar-16 0:23

12-Mar-16 0:23

thanks for your quick response, sorry for my inadequate question, I refreshed it

Sascha Lefèvre12-Mar-16 0:06

12-Mar-16 0:06

guest80 wrote:
I draw some lines that change acording to my parameters on it

Your code doesn't show any parameters for Form1 which could influence the drawing of the lines. You probably want to pass those as arguments to the constructor of Form1 (for which of course you would have to change the constructor signature accordingly first).

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

guest8012-Mar-16 0:23

12-Mar-16 0:23

thanks for your quick response, sorry for my inadequate question, I refreshed it

Sascha Lefèvre12-Mar-16 0:36

12-Mar-16 0:36

Where do you create the Image that you show in the PictureBox?

While your updated source shows arguments to the constructor of Form1 it appears that all instances of Form1 are created with the same argument-values.

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

guest8012-Mar-16 1:15

12-Mar-16 1:15

Actually In Form1, I drag and drop a picturebox on form and assign an image from property window, the picture always will the same, but lines on it (I use picturebox_Paint event) will be different according to parameters(group, paradigm etc)

this is full code in mainform (MDI form) (the class structure a little bit complicated so I tried to ask my question simple form but I couldn't). I am new in programming so sorry for this.

private void treeView2_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {

            for (int i = 0; i <= ClairBLL.Classes.LoadNodes.groupNames.Length - 1; i++)
            {
                for (int y = 0; y <= ClairBLL.Classes.LoadNodes.paradigmNames.Length - 1; y++)
                {
                    for (int m = 0; m <= ClairBLL.Classes.LoadNodes.methodNames.Length - 1; m++)
                    {
                        for (int f = 0; f <= ClairBLL.Classes.LoadNodes.frequencyNames.Length - 1; f++)
                        {
                            if (treeView2.Nodes[i].Nodes[y].Nodes[0].Nodes[m].Nodes[f].IsSelected == true)
                            {
                                Group = treeView2.Nodes[i].Text;
                                Paradigm = treeView2.Nodes[i].Nodes[y].Text;
                                stimChoise = treeView2.Nodes[i].Nodes[y].Nodes[0].Text;
                                Method = treeView2.Nodes[i].Nodes[y].Nodes[0].Nodes[m].Text;
                                frequncyChoise = treeView2.Nodes[i].Nodes[y].Nodes[0].Nodes[m].Nodes[f].Text;

                                Form1 diagram = new Form1(Group, Paradigm, Method, stimChoise, frequncyChoise);

                                diagram.MdiParent = this;
                                diagram.Show();
                            }
                        }
                    }
                }
            }
        }

Sascha Lefèvre12-Mar-16 1:20

12-Mar-16 1:20

No worries Smile | :)

I guess OriginalGriff hit the spot then with the Image instance being/having been shared among your Form1 instances.

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

OriginalGriff12-Mar-16 0:12

OriginalGriff

12-Mar-16 0:12

Copy the image, so that all the children aren't referring to the same one.
If each child creates it's own copy of the image and loads it into the picturebox, then the images are separate. If they all refer to the same image, then any change to one of them changes the image in them all.
And this does not copy the image:

Image image = myPictureBox.Image;
Image otherImage = image;
myOtherPictureBox.Image = otherImage;

All it copies is a reference to the same image, in the same way that if you and your girlfriend share a car, you can refer to it as "my car", "her car", or "our car" - three separate references to the same physical vehicle.
To copy an image, you need to copy the underlying bitmap image data, so use the Image.Clone Method (System.Drawing)[^]

[edit]Typos... Sigh | :sigh:

[/edit]

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...

modified 12-Mar-16 10:04am.

guest8012-Mar-16 0:25

Need help in C# project which uses bluetooth technology.

12-Mar-16 0:25

Okay, I will try this way. I hope it works in this time, Thanks for your advice!

Member 1235574311-Mar-16 20:03

Member 12355743

11-Mar-16 20:03

Guys, I am working in C# Project to provide an security to computer/laptop using bluetooth.
I need to enlist the active bluetooth devices nearby your laptop.... I am unable to code it.
Would anyone please help me to with the coding?

(Note: I am able to list all the bluetooth devices that is active devices & the devices that has already been paired to your laptop, but i am unable to differentiate active bluetooth devices)

Use narrator in C#

Member 1238647111-Mar-16 14:20

Member 12386471

11-Mar-16 14:20

Hi people! Do you know how to use portuguese narrator in C#?
Smile | :)

Re: Use narrator in C#

Richard MacCutchan11-Mar-16 22:04

Richard MacCutchan

11-Mar-16 22:04

Member 12386471 wrote:
how to use portuguese narrator

What is it?

steganography cover audio using modification LSB and phase coding technique

Toni Andika10-Mar-16 23:20

Re: steganography cover audio using modification LSB and phase coding technique

10-Mar-16 23:20

any body can help me to make a program using windows Form Application Visual C# ?
Description: I want to hide the secret message into audio file(wav), but before the plaintext inserted into audio ,encrypt/decrypt the plaintext using RSA Algorithm and after that the chipertext inserted into audio using modification LSB phase coding technique.

please help me Cry | :((

Sascha Lefèvre10-Mar-16 23:36

Re: steganography cover audio using modification LSB and phase coding technique

10-Mar-16 23:36

You say you need help and what you want to do but you don't say what kind of help you need.

Did you take a look at the plethora of articles on steganography and encryption on CodeProject?

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

Toni Andika11-Mar-16 1:24

Re: steganography cover audio using modification LSB and phase coding technique

11-Mar-16 1:24

yes I did, but there is no articles on CodeProject about steganography using LSB and phase coding. I really confused about that.

Sascha Lefèvre11-Mar-16 1:31

Re: steganography cover audio using modification LSB and phase coding technique

11-Mar-16 1:31

Since you want to encrypt the message before embedding it into an audio file, your first step would be to get the encryption and decryption going. For that you'll find plenty of help from articles here.

From my understanding, embedding the cipher in the LSB's of an audio file should be rather trivial provided that you can find an audio library that permits you to manipulate the audio stream in that fashion (I'm no expert there). Have you looked for .NET audio libraries?

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

Toni Andika11-Mar-16 2:06

Re: steganography cover audio using modification LSB and phase coding technique

11-Mar-16 2:06

yes.. that's what I want
I need audio library to manipulate the audio stream, but I can't explain since the begining.
do you know the name of audio libraries on framework.NET (C#) ?
and how I can to use it ?
can you explain to me ?

Sascha Lefèvre11-Mar-16 2:43

Re: steganography cover audio using modification LSB and phase coding technique

11-Mar-16 2:43

As I said, I'm no expert for this. The only .NET audio library I know off the top of my head is this one: NAudio - Home[^]. But I don't know if it allows you to do what you want. You'll have to take a look at it. And if it doesn't, look for alternatives: .net audio library - Google Search[^]

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

Toni Andika14-Mar-16 1:17

Re: steganography cover audio using modification LSB and phase coding technique

14-Mar-16 1:17

thanks for your suggest Thumbs Up | :thumbsup:

Sascha Lefèvre14-Mar-16 1:49