Generating tabs dynamically - C# Discussion Boards

Dynamically update combo box items bound to data source

SloanCode5-Dec-04 9:53

5-Dec-04 9:53

Hello all,

How do I update combo box items bound to a data source? Say I have several combo boxes used for customer address fields. I have a combo box for states and cities. When I select a state, second combo box should display all cities in selected state. It works fine when I do state selection at the first time, all cities are selected from the table shown in the "city" combo box. When I try to select another state, the "city" combobox doesn't get refreshed. Is there anything I have to do to force combobox to refill its contents from the datasource and how do I do that?

Thanks in advances.

Browse button

dragonroamer5-Dec-04 9:53

dragonroamer

5-Dec-04 9:53

How do u obtain the system information to program a browse button?

Re: Browse button

tom_dx5-Dec-04 15:06

tom_dx

5-Dec-04 15:06

what are you talking about, a button to return the value of a user specified file or folder?? take a look at openfiledialog control or folderbrowserdialog control

IM PROUD TO BE A GMAIL;

capturing other applications...

eligeti5-Dec-04 9:47

eligeti

5-Dec-04 9:47

Hi,

I am trying to solve a problem using C#. Basically it invovles capturing any application in the form of image. lets say the active application is acrobat reader, My application has to capture the image of the window of it and send it across the network.

Networking part is very easy in C# but capturing the image of other applications i could not find a way. Please tell me if i can do that with other lnaguages like c, C++.

eligeti

Re: capturing other applications...

Daniel Turini5-Dec-04 20:04

Daniel Turini

5-Dec-04 20:04

eligeti wrote:
Networking part is very easy in C# but capturing the image of other applications i could not find a way.
To capture an image of a visible window, you need to use GDI and BitBlt. IF the window is not visible, you can use WM_PRINT and/or WM_PRINTCLIENT.
Not exactly for newbies, but you can find a lot of samples on how to do this on Google.

Yes, even I am blogging now!

Making listView.labelEdit editable on one click

youusuf5-Dec-04 8:36

youusuf

5-Dec-04 8:36

Hey I have created a Listview with labelEdit property set to true.
But for the label to become editable it requires atleast 2 clicks.
How can I make it editable on a single click ??

If i set the Activation property to single_click it cant be edited at all

Re: Making listView.labelEdit editable on one click

Daniel Turini5-Dec-04 20:10

Daniel Turini

5-Dec-04 20:10

On the click event, call:
SendMessage(yourListView.Handle, LVM_EDITLABEL, itemToEdit, 0);

and add the following declarations to your class:
[DllImport("User32.dll")]
public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);

const int LVM_EDITLABEL = 4214;

Yes, even I am blogging now!

Generating tabs dynamically

thepersonof5-Dec-04 3:22

thepersonof

5-Dec-04 3:22

Hi I have this code

<br />
string name = "tabPage0"; // This in reality is dynamic<br />
mainTabs.TabPages.Add(name);<br />

Then I would like some way to set tabPage0.Text How is this done?
Thanks

Re: Generating tabs dynamically

Nick Parker5-Dec-04 4:26

Nick Parker

5-Dec-04 4:26

You could just write a function that will dynamically add new TabPage's for you. Something like the following will do it for you, this assumes the TabControl is a member of the same class of this method. You could change this if you needed but this should get you started.

private void AddNewTabPage(string tabText)
{
    TabPage tp = new TabPage(tabText);
    this.TabControl.TabPages.Add(tp);
    this.TabControl.SelectedTab = tp;
}

- Nick Parker
My Blog | My Articles

Re: Generating tabs dynamically

thepersonof5-Dec-04 4:45

thepersonof

5-Dec-04 4:45

Thanks, I wasn't very clear. I was looking for a way to dynamically name tabs. How could I create a function to add tabs with different names for each one?

Re: Generating tabs dynamically

Nick Parker5-Dec-04 5:06

Nick Parker

5-Dec-04 5:06

You can use the method I wrote above, write a separate method to randomly generate text and with each text generation, call my method to create the TabPage.

- Nick Parker
My Blog | My Articles

Re: Generating tabs dynamically

Anonymous5-Dec-04 8:26

Anonymous

5-Dec-04 8:26

If I'm understanding correctly, what you are trying to acheive cannot be done.

You cannot name a control and then use its name in your code as you would with any other variable. That isnt possible because the compiler will not know of the name ur assigning as it will only be "visible" in runtime.

That means that, follwing ur example:

string name = "tabPage0";
mainTabs.TabPages.Add(name);

You will never be able to use in your code tabPage0.WhateverMethod. That can only be done if u declare a tabPage0 variable in ur code.

U will have to work with the tabpages collection indexes or iterate through it looking for the correct Text/Name or whatever.

Drawing a Family Tree

pjholliday5-Dec-04 1:47

pjholliday

5-Dec-04 1:47

I am trying to draw a Family tree onto a panel by adding several custom panels that contain the data about each person in the tree. I have all the panels displaying but my formula for working out where to place each custom panel is placing them incorrectly.

This is my formula.

child is the custom panel one generation back in the tree and the index is set according to its vertical position in the generation (i.e the one nearest the top of the panel is 1 and the next lowest 2 and then next lowest 3 etc..)

generation is the generation the the animal belongs to (1 being the initial person, 2 being the parents, 3 the grandparens)

pw = the custom panel width, hg = the gap between generations, pd = the custom panel height, paneldepth = the main panel height

I want the tree to draw left to right.

The x co-ordinate works fine its the y co-ordinate that doesnt work, it causes earlier generation to be too close together.

// Set Panel Location
int x = child.Location.X + pw + hg;
int y = ((paneldepth / (generation + 1)) * ((2 * child.Index) - 1)) - (pd / 2);
parentpanel.Location = new Point(x, y);

Can anyone suggest a formula that might work?

unicode problem in INI

ye win zaw5-Dec-04 1:17

ye win zaw

5-Dec-04 1:17

I would like to read unicode from INI in my application. Reading from GetPrivateProfileString is ????
For example..
I want to read and display Thai Words in my application.

[Thai]
Card=บัตร

Thanks in advance.

Re: unicode problem in INI

Nick Parker5-Dec-04 4:29

Nick Parker

5-Dec-04 4:29

You can P/Invoke the GetPrivateProfileString as I did below, string's in .NET are unicode.

[DllImport("kernel32.dll")]
static extern uint GetPrivateProfileString(string lpAppName, string lpKeyName, string lpDefault, StringBuilder lpReturnedString, uint nSize, string lpFileName);

- Nick Parker
My Blog | My Articles

Re: unicode problem in INI

Christian Pedersen5-Dec-04 13:34

Christian Pedersen

5-Dec-04 13:34

Hi
Use GetPrivateProfileStringW (notice the W)
That's the unicode version.

I have a network application

Mohammed Aijaz Mohiuddin5-Dec-04 1:04

Mohammed Aijaz Mohiuddin

5-Dec-04 1:04

I have a network application. These two application has a form on which two label controls are present.

Please see the diagram...

Host1 Host2

Form1.cs Networkoperation.cs Form1.cs

Networkoperation.cs class actually handles the communication between the two applications.

What I Want? I want to have button on each form If I click the button the text present in a textbox on the form has to go the same label control and should be assigned to the Text property of the control.

I am unable to do this, Because how to get the handle of label control of form1.cs class in networkOperation.cs Class?

Any one who knows it Please help to me.

Syntax hightlighting.

Marlun5-Dec-04 0:51

Marlun

5-Dec-04 0:51

Hi!

I'm wondering if there are any free texteditor components out there where you can have syntax hightlighting for multiple languages?

If not, any good articles on how to acomplish this yourself?

Thanks in advance!

~~~~~~~~~~~~~~
Martin Lundberg
Student, Sweden

I have to thank every member of the Code Project for making it such a great place for a beginner to learn!

Re: Syntax hightlighting.

Nick Parker5-Dec-04 4:30

Nick Parker

5-Dec-04 4:30

Martin Lundberg wrote:
If not, any good articles on how to acomplish this yourself?

There are articles online that cover how to do this using a RichTextBox class. This[^] one should get you started.

- Nick Parker
My Blog | My Articles

Re: Syntax hightlighting.

leppie5-Dec-04 7:36

leppie

5-Dec-04 7:36

Have a look at my "IDE". :p Totally over engineered highlighting Smile | :)

Far from complete though...

^{top secret
Download xacc-ide 0.0.3 now!
See some screenshots}

How to create a shortcut key for a control in C#?

momer5-Dec-04 0:30

momer

5-Dec-04 0:30

Hi,
I want to select a member of TabControl by stroking keyboard but not by clicking the mouse on it.So,I think I have to create a shortcut key for that member.Can you tell me how to create it?
Thanks!

Re: How to create a shortcut key for a control in C#?

Kir Birger5-Dec-04 5:46

Kir Birger

5-Dec-04 5:46

i'm not certain what you mean. but if i understandyou properly you want a control to gain focus when a button is pressed?

well i havn't done anything with tabs (never needed to) but here's the general code.

goto the events list on the form that the tabs are on and create a KeyDown handler by double clicking on it.

in the handler do something like this...

if(e.KeyCode == Keys.____)
{
tc.focus();
}

e being keyeventargs, tc being your tab control.

i hope that helped a bit

Re: How to create a shortcut key for a control in C#?

Nick Parker5-Dec-04 6:52

Nick Parker

5-Dec-04 6:52

Here[^] is an article on creating keyboard accelerators in C#. This should get you started.

- Nick Parker
My Blog | My Articles

file.Position problem

balkang4-Dec-04 23:04

balkang

4-Dec-04 23:04

After this code EndofHeader is still zero.
Why?

FİleInfo fp = new FileInfo(path);
FileStream file = fp.Open(FileMode.Create);
StreamWriter sw = new StreamWriter(file);
sw.WriteLine("{0} {1} {2} {3} {4} {5}",m,0,-1,1,1;
EndofHeader = file.Position;

balkan

Re: file.Position problem

Robin Panther5-Dec-04 1:56

Robin Panther

5-Dec-04 1:56

You could try
sw.WriteLine(String.Format("{0} {1} {2} {3} {4} {5}",m,0,-1,1,1,1));

one argument is missing, and String.Format too...

try adding sw.Flush(); after WriteLine

Hope it'll help...

Robin Panther

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.