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I use an ordinary tree view inside a dialog, but I wish to write a text saying "No data available"
if the treeview (which is filled with items loaded from files) is empty.
Instead of just adding a node saying "No Data Available", which doesn't look very good,
I'd like to set a flag in the control (The control is a very thin wrapper for the API's treeview)
and when that flag is set draw the string centered in the treeview instead.
I found somewhere on google that this was only possible using Win32 messages with p/invoke.
My question is, how do I do this? I get the handle of the control and send some kind of paint message?
I haven't been into painting in WIN32 very much...
can anyone help me?
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The TreeView class is simply a wrapper around the Win32 TreeView control. You could simply subclass the TreeView and add your P/Invoke statements there. Depending on what you want to do, you could do something as simple as the Win32 function DrawText. The P/Invoke signature looks like this:
[DllImport("user32.dll")]
static extern int DrawText(IntPtr hDC, string lpString, int nCount,
ref RECT lpRect, uint uFormat);
Also, you could just use the Graphics object and call the DrawString method. It all depends on what you are doing, this should get you started.
- Nick Parker
My Blog | My Articles
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Thanks for the advice, got it working. What I did was to override the wndproc and catch the WM_PAINT message, upon which a call to CreateGraphics() let me paint what I want.
What I tried originally was overriding the OnPaint method, but that didn't work, never got called I think..? (why?)
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I am getting data from a database, and after some pushing and poking, I have a User object. I then create a list of these Users. I have a couple of accessors:
public string FullName()
{
get
{
return m_name;
}
}
public User GetUser()
{
get
{
return this;
}
}
and
lstUsers.DisplayMember = "FullName";
lstUsers.ValueMember = "GetUser";
and finally
private void lstUsers_SelectedIndexChanged(...)
{
User u = (User)(lstUsers.SelectedValue);
...
}
There must be an easy way than this. Any ideas?
Regards,
Barry
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Barry Lapthorn wrote:
There must be an easy way than this. Any ideas?
Looks easy enough for me!
top secret xacc-ide 0.0.1
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I should have said 'less crap' 
The 'callback' is a string. Seems to me like it would be boiler plate code (returning an object handle from a selected list) and perhaps should have been in the CLR.
Regards,
Barry
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Barry Lapthorn wrote:
There must be an easy way than this. Any ideas?
To do what? You really haven't said what your problem is.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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You could also override the ToString() method of your object and make it return the username as a string. As far as the callback goes, why not just insert the object into the listbox. When you want to get it back out, all you need to do is cast it to the appropriate type. Or am I missing something?
Will
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Do you have an example of this? 
Regards,
Barry
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My problem is that return the reference to the object from a drop down list must be a common thing, and there's no consistent (e.g. interface) way of doing it, and that the way you have to do it is via a function call back that is a string, and therefore weakly typed.
Regards,
Barry
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Have I asked myself what the best way to enumerate a tree-like structure is (e.g. a TreeView, Directories)? I'd like to ask your opinions about it.
Regards,
Matthias
If eell I ,nust draw to your atenttion to het fakt that I can splel perfrectly well - i;ts my typeying that sukcs.
(Lounge/David Wulff)
www.emvoid.de
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Recursion, if you are not worried about speed, else you will have to go to drawing board and dish up your own fast lookup method (eg a hashtable after recusing thru the entries).
top secret xacc-ide 0.0.1
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Hi
I am developing the application in C#
I am using Magic's TabControl.
My requirement is I want my Tabs to appear Vertically one below each other.
Please can anybody help me.
TabControl from Windows have one property named "Alingment" If i set it to right.It creates TAb page on right side but next tab page gets added in horizontal direction and not vertically down.
Thanks in advance
Archana
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How to redirct question to Article's forum?
I am not getting.
Archana
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Hello!
I'm using the well-known technique of handling unhandled thread level exceptions with a nice dialog, etc.
However, while it perfectly works on my PC, on a user's PC with just the framework installed, a generic Windows dialog pops up, showing just the "thread ID" and two choices: OK to Debug, Cancel to quit.
My question is: why doesn't it work?
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I have seen this (but very long ago) on win98. I suggest u make sure all the .NET prerequisites are installed and then reinstall .NET just to be double sure!
top secret xacc-ide 0.0.1
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System.Net.WebClient test = new System.Net.WebClient();<br />
test.DownloadFile("www.microsoft.com","D://test//index.aspx");
When I run this statement using my web program page to download my page to htm it gives me an error The remote server returned an error: (403) Forbidden. Please help me on how can I get around this one.
/dabuskol
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Hello all.
I have a extrange behavior in my computer.
My regional configuration is Spanish ( Spain ) which means that the local decimal separator is ','.
If I run this code the results are
double d = 5.1;
string s = d.ToString (); //s= "5.1"
which is not the expected result ( it must be "5,1").
I have checked the value of
System.Threading.Thread.CurrentThread.CurrentCulture
and the culture is spanish-spain and the currency decimal separator is ','.
But the most extrang thing is that I have gone to the control panel, I have changed the local configuration to Catalonian, then without close the dialog I have changed another time to Spanish-Spain and after that the previous code works and the double is translated to "5,1".
Anyone have some similar problems ? Is this a bug of the framework. Can anyone help me ? 
Best regards
Jose Vicente
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I think that problem can be solved in Windows.
There are possibilities to change culture-settings in "control panel" -> "regional settings" -> "numbers" (At least Win2000).
There are many settings which you can change. Perhaps is Windows meaning that i Spain the standard seperator is '.'?
Try this and hope that this works...
If not, I´m sorry to reply this question, and forgot everything I wrote
Ciao
Norman-Timo
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I have divided a form in two parts, first half contains a tree view control, in the next half there is a panel control, on
that I draw some controlls like check box, radio button, combo box, numeric up down, etc. at runtime, corresponding
to the node click of the tree view control.
In this case how and where should I store the status of each control?
e.g.
If there is a check box and a combo box corresponding to the node 1 and I click node 2, before drawing the controlls
corresponding to node 2 on the panel, where should I save the status of the controls corresponding to node 1 such
that when I again click node 1 , I should again get the old status of the controlls corresponding to it.
Please guide.
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I´m not sure if I´m correct, but I think the best Method is to create for each node an own Object-Class. And in this class you are allowed to set values from your combobox, checkbox...
So you have to initialize your complete tree with all Object-Classes first, and then you´re able to switch between this classes.
Maybe I´m wrong, because I´m not so an experienced programmer.
So maybe I help you to find your own slution with this hint.
Your
Norman-Timo
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I have to find out the maximum number of nodes for a child node
ex. my Xml is
<customers>
<customer id="c1">
<name>aaaa</name>
<job>Plumber</job>
<city>Hdddd</city>
<state>aaaaa</state>
</customer>
<customer id="c2">
<name>hhhhhhhh</name>
<job>hdfgdfgdf</job>
<city>dfgdfg</city>
<state>dfgdf</state>
</customer>
<customer id="c3">
<name>Memphis rays</name>
<job>
Car guy
<designation>dfsdfsd</designation>
</job>
<city>dfgdfgdfg</city>
<state>fgdfgdf</state>
</customer>
</customers>
Now the third customer node has a child to it's child (customer/job/designation) I need to find out that node, that has maximum children.. by reading the Xml file through C#.
Help!
<b>_____________________________________________________</b>
<b>Yea! I could be wrong...</b>
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