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Hello,
Im trying to workout how to dynamically add tab pages with RichTextBox inside them. So far:
1. I have a form with a input field to enter how many tab pages to create
2. A button that calls the method to create tab page when clicked
3. a tabcontrol with no pages on it
Here is a demo - http://img525.imageshack.us/img525/4519/untitledxv6.jpg[^]
This is the code i have on form1.cs
static int maxTabs = 20;<br />
TabPage[] tabPages = new TabPage[maxTabs];<br />
SyntaxHighlightingTextBox[] shtb;<br />
private void AddTab(int tabNumber)<br />
{<br />
for (int i = 0; i < tabNumber; i++)<br />
{<br />
tabPages[tabNumber] = new TabPage();<br />
tabPages[tabNumber].Location = new System.Drawing.Point(4, 22);<br />
tabPages[tabNumber].Name = "tabPage" + tabNumber.ToString();<br />
tabPages[tabNumber].Padding = new System.Windows.Forms.Padding(3);<br />
tabPages[tabNumber].Size = new System.Drawing.Size(403, 386);<br />
tabPages[tabNumber].TabIndex = tabNumber;<br />
tabPages[tabNumber].Text = "tabPage " + tabNumber.ToString();<br />
tabPages[tabNumber].UseVisualStyleBackColor = true;<br />
<br />
shtb[tabNumber] = new SyntaxHighlightingTextBox();<br />
shtb[tabNumber].Name = "shtb" + tabNumber.ToString();<br />
shtb[tabNumber].Location = new Point(0, 0);<br />
shtb[tabNumber].Dock = DockStyle.Fill;<br />
<br />
tabPages[tabNumber].Controls.Add(shtb[tabNumber]);<br />
tabControl.Controls.Add(tabPages[tabNumber]);<br />
<br />
tabPages[tabNumber].SuspendLayout();<br />
tabPages[tabNumber].ResumeLayout(false);<br />
int counter = tabControl.Controls.Count;<br />
tabControl.SelectedIndex = counter - 1;<br />
this.Text = "TabText1 - " + tabPages[tabNumber].Text;<br />
}<br />
}<br />
<br />
private void AddButton_Click(object sender, EventArgs e)<br />
{<br />
try<br />
{<br />
AddTab(int.Parse(tabNumberTextBox.Text));<br />
}<br />
catch (Exception ex)<br />
{<br />
MessageBox.Show("Following Error Occured\r\n\r\n" + ex.Message);<br />
}<br />
}
When i build this solution, i get no error at all, but when i enter 1 into the input field and click the add button, i get the following exception error message:
object reference not set to an instance of an object
What does this mean? I've never seen this error before, so i not sure how to fix this. Can someone point me in the right direction on how to fix this error...? It builds correctly, so i assumed i wrote the program correctly.
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I suspect this: SyntaxHighlightingTextBox[] shtb; it's not initialized.
I also wonder why you have arrays of TabPages and SyntaxHighlightingTextBoxes.
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If its not getting initialized,
should i move the code inside:
public Form1()
{
InitializeComponent();
}
I have an array of tabpages and shtbs because, i want to be able to many many instances of tabs with richtextboxes inside them, dynamically on demand.
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Note the difference between these two statements:
TabPage[] tabPages <big>= new TabPage[maxTabs];</big><br />
SyntaxHighlightingTextBox[] shtb;
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I saw the difference in the code, however, when i changed the code like this (before when i was doing some trial and error):
TabPage[] tabPages = new TabPage[maxTabs];<br />
SyntaxHighlightingTextBox[] shtb = new SyntaxHighlightingTextBox();
I started to get this error message:
Cannot implicitly convert type 'SynHighLib.SyntaxHighlightingTextBox' to 'SynHighLib.SyntaxHighlightingTextBox[]'
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As you should, try
SyntaxHighlightingTextBox[] shtb = new SyntaxHighlightingTextBox<big>[somevalue]</big>;
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OMG... that worked O_O;
Thank you very much 
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Of course it does. Now donate a pint of blood to the Red Cross.
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I recommend if you're coding blind and trying things to see if they work, you buy a C# book and work through it.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Latheesan wrote: I have an array of tabpages and shtbs because, i want to be able to many many instances of tabs with richtextboxes inside them, dynamically on demand.
You don't need arrays for that, the TabControl and TabPage have Collections for them.
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Oh? i didnt know that,
Is there any example on how to use this? I haven't seen any good tutorials on tab pages anywhere yet. I did do a bit research tho.
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Here's my version: (I used a RichTextBox because I don't know what that other thing is.)
private void AddTabs ( int tabNumber )
{
System.Windows.Forms.TabPage tabPage = null ;
System.Windows.Forms.RichTextBox shtb;
tabControl.SuspendLayout() ;
tabControl.Controls.Clear() ;
for (int i = 0; i < tabNumber; i++)
{
tabPage = new System.Windows.Forms.TabPage();
tabPage.Location = new System.Drawing.Point(4, 22);
tabPage.Name = "tabPage" + i.ToString();
tabPage.Padding = new System.Windows.Forms.Padding(3);
tabPage.Size = new System.Drawing.Size(403, 386);
tabPage.TabIndex = i;
tabPage.Text = "tabPage " + i.ToString();
tabPage.UseVisualStyleBackColor = true;
shtb = new System.Windows.Forms.RichTextBox();
shtb.Name = "shtb" + i.ToString();
shtb.Location = new System.Drawing.Point(0, 0);
shtb.Dock = System.Windows.Forms.DockStyle.Fill;
tabPage.Controls.Add(shtb);
tabControl.Controls.Add(tabPage);
tabPage.SuspendLayout();
tabPage.ResumeLayout(false);
}
this.Text = "TabText1 - " + tabPage.Text;
tabControl.SelectedIndex = tabControl.Controls.Count - 1;
tabControl.ResumeLayout() ;
}
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I tried entering 0 into the input box and try to add a tab, this time no exception error, but instead, nothing happens.
Where im i going wrong? Why wont this work?
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Okay, i made a silly mistake in the for loop, but here's the fixed version of the for loop code:
for (int i = 0; i < tabNumber; i++)<br />
{<br />
tabPages[i] = new TabPage();<br />
tabPages[i].Location = new System.Drawing.Point(4, 22);<br />
tabPages[i].Name = "tabPage" + i.ToString();<br />
tabPages[i].Padding = new System.Windows.Forms.Padding(3);<br />
tabPages[i].Size = new System.Drawing.Size(403, 386);<br />
tabPages[i].TabIndex = i;<br />
tabPages[i].Text = "tabPage " + i.ToString();<br />
tabPages[i].UseVisualStyleBackColor = true;<br />
<br />
shtb[i] = new SyntaxHighlightingTextBox();<br />
shtb[i].Name = "shtb" + i.ToString();<br />
shtb[i].Location = new Point(0, 0);<br />
shtb[i].Dock = DockStyle.Fill;<br />
<br />
tabPages[i].Controls.Add(shtb[i]);<br />
tabControl.Controls.Add(tabPages[i]);<br />
<br />
tabPages[i].SuspendLayout();<br />
tabPages[i].ResumeLayout(false);<br />
int counter = tabControl.Controls.Count;<br />
tabControl.SelectedIndex = counter - 1;<br />
this.Text = "TabText1 - " + tabPages[i].Text;<br />
}
This compiles correctly, yet, when i run it, i get the exception error again...
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Hello again
well I was thinking abt making a new control that works like the pane windows of Visual Studio 2005 IDE, u know the one's on the right and left corner of the screen which u can choose to auto hide any time showing you properties, solution explorer and tools etc. I know u have to make new user controls or use control customization and I looked into a sample program I got from Codeproject.com and that thing looked kind of over whelming so Can any one of u plz tell me where to start off if any buddy wants to work on these grounds? Is there a comprehensive book on this or some study material over the internet? Plz tell me abt it?
thanks
Rocky
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Just create a new user control in the wizard, and then add things as you need them. Read up on the events that are fired, and think about what you need to do to get to where you want.
You can also derive from an existing control.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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ahh this question might sound a bit too naive but where does that wizard come from that ur talking abt
Christian Graus wrote: Just create a new user control in the wizard
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hi every one,
well I'm having table called users(UserName varchar(15) PK, Password varbinary(256))
plz tell me how to insert data in thi s password field.
There is one way to use a query in the code
like
"insert into users values ('"+UserName+"', Convert(varbinary, '"+pass+"'))";
but I wanted to use the insert function in the table adapter u know. and it requires this passwrd to be byte[]
so how do u convert a string to byte[]
Rocky
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System.Text.Encoding.Unicode.GetBytes ( "Hello world" )
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Hello everyone!
Okay. I have a game, and it has weapons. I have code like this:
<code>
abstract class Weapon
{
int power;
}
class W_Handgun : Weapon
{
public W_Handgun()
{
power = 40;
}
}
Well, there will be many different types of weapons. So I'd like to save all of the different types in an XML file instead of hard-coding them.
My question is, how do I do that? I know how to read XML files, but how do I convert something like <Handgun><Power>40</Power></Handgun> to the above mentioned class? I'm lost. (And excuse the smiley.)
Thanks in advance!
Windows Calculator told me I will die at 28. 
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Look into XML serialization.
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Oh, so that's how it's done. I won't use this method because it's an online game, and it'll be easy for people to hack it. But thanks!
Windows Calculator told me I will die at 28. 
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At least I hope you won't die at 28 
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Trust me, I do too.
Windows Calculator told me I will die at 28.
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