|
First of all, I just started learning C# and I'm using VS 2005 Express Ed.
I have a small form with a TreeView control in it. I want to pass a root folder to the following function and populate a TreeView control with directories. My problem is that I don't know how to access the parent nodes or child nodes to add the subdirectory under it's parent directory. The following code simply displays all the folders under the first node.
private void FindAllFolders(string sFolder)
{
try
{
foreach (string dir in Directory.GetDirectories(sFolder))
{
string temp = dir.ToString().Substring(rootFolder.Length);
treeView1.Nodes[0].Nodes.Add(new TreeNode(temp, 1, 2));
FindAllFolders(dir);
}
}
catch (Exception e)
{
MessageBox.Show(e.Message.ToString(), "Directory Search Exception Error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
Thanks,
Mark
|
|
|
|
|
TreeView.Nodes = Gets the collection of tree nodes that are assigned to the tree view control.
TreeView.Nodes[0] = First node in collection.
TreeView.Nodes[0].Nodes = Collection of nodes under first node, i.e the children of the first node.
only two letters away from being an asset
|
|
|
|
|
Ok I understand the collections but if I add an item to the treeview, how do I get a reference to the last node that I inserted?
In VC++/MFC you can get an HTREEITEM returned when you insert an item in a CTreeView.
So when I insert a folder in the TreeView control using C#, and that folder has subfolders I need to then reference that node to insert the subfolder(s) under it.
Mark
|
|
|
|
|
http://msdn2.microsoft.com/en-gb/library/esz34cwb.aspx[^]
Taken directly from the above MSDN link.
TreeNodeCollection.Add Method (String)
Adds a new tree node with the specified label text to the end of the current tree node collection.
public virtual TreeNode Add (
string text
)
Parameters
text
The label text displayed by the TreeNode.
Return Value
A TreeNode that represents the tree node being added to the collection.
only two letters away from being an asset
|
|
|
|
|
I posted a message few weeks ago about me trying to run my exe file on my roomate's laptop, I finally got it to work by taking the crystalreport off the project, so do you guys know if I need to download anything beside the frame work to make my crystal report work on my roomates laptop ???
aPerfectTool
|
|
|
|
|
What is quick method and what is bubble method? 
|
|
|
|
|
What are you talking about?
Perhaps sorting... But, please, let us know!
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
|
|
|
|
|
yes sorting but how sort bubble method and how sort quick method?
|
|
|
|
|
Google is your friend...even for homework questions. The answer is probably also in your textbook.
|
|
|
|
|
Rob Graham wrote: Google is your friend...even for homework questions
It won't flame you or get mad 
Some people have a memory and an attention span, you should try them out one day. - Jeremy Falcon
|
|
|
|
|
Hence Google is your good friend, see here [^] and here [^].
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
|
|
|
|
|
Hullo Folks,
Am trying to develop a point of sale system for a mobile company.
The point of sale is of distribution of airtime to customers.
The Server is on a Linux box and has MySQL database(This is where the phone Airtime recharge numbers are stored)
Am to develop a client application using C#, the POS is to work in such away that.
The distributor goes to the mobile company, pays say $3000,
So whenever he sells airtime on his account is reduced.
The client will communicate with the server(has MySQL database) over a GSM modem.
However whenever the Distributor requests for Air-time from the server,
The amount he gets will be cached; the amount cached is what he will sell until,
It goes to zero, then he will request more from the server…then cache it….
This will go on and on until his account at the server goes to Zero.
Look at it in this way, you have a bank account, you need say $500,get to the ATM, withdraw the $500,u will have the $500,but your account balance has been reduced by $500,
So you use that $500,till its over and when you need more, you go back to the ATM for more.
How the airtime will be distributed is in 2 ways.
· The point of sale printer will print the recharge number on a piece of paper
Say 123-674-627-63,which will be given to the customer.
· The distributor should be able to directly load the airtime onto the customer’s phone
Can I please have help on how I can go about this one?
Especially the communication over the GSM modem to the server, which is Linux box.
Waskira
|
|
|
|
|
Hi,
I get the above exception while using my code and I really do not know why. The code creates a jagged string array which includes two arrays. Each array holds 20 string items. (In the following code I removed some of it as to not overload this page...).
I then use a for statement (it made en exception using foreach as well), inwhich I create a new Regex variable and use it to replace text. The code is:
string[][] newInfo = new string[2][];
newInfo[0] = new string[20] {"string 1", "string 2", "string 3", ... };
newInfo[1] = new string[20] {"string 1", "string 2", "string 3", ... };
for (int i = 0; i < newInfo[0].Length; i++) {
string parameter = newInfo[0][i];
string value = newInfo[1][Array.IndexOf(newInfo[0], parameter)];
if (value != "-")
{
Regex rxParameter = new Regex("\x7C" + parameter + "=" + ".*" + "\x7C");
p.text = rxParameter.Replace(p.text, "\x7C" + parameter + "=" + value + "\x7C");
}
}
After compiling and running this, the program get stuck at i=3, at the replace function. I dont know why the program is out of memory. Does anyone know what I should do?
Thanks,
Yoni
|
|
|
|
|
Did you look at the call stack for the exception? Did it have any InnerException set? Is the OutOfMemoryException reproducible always at i = 3?
|
|
|
|
|
I am new to C#. I use a text writer called EditPlus to edit the code; and MSDOS to compile it and make an exe out of it. All I get is the exception. I do not know what the "call stack for the exception" or else enything else. I do know that the OutOfMemoryException apears every time I run the program, and every time at i=3. I can also add that i=0 and i=1 goes through quick, less than half a second; i=2 has a small delay, of like half a second, and then i=3 just stalls. I have the free Visual C++ 2005 Express but I have no idea how to use it (i.e. how to load my .cs file).
I know this sound hopeless, but I really do not see a way out of this...
Thanks,
Yoni
|
|
|
|
|
Express edition is really easy to use. You may have to create a new "empty project", then copy and past in your c# program. That should give you all the debugging info so you can see the stack
there are several vedio files for getting started with the express edition. Check microsoft web page. 
|
|
|
|
|
Thanks for the tip, I'll check out Microsoft's site..
Yoni
|
|
|
|
|
Is your application a console app or a windows app? If it's a console app, after the OutOfMemoryException occurs, you should be able to see the stack trace on the console window. The stack trace simply lists the sequence of function calls that triggered the exception. Even otherwise, you can wrap the code that you think is causing this exception with a try catch block like this
try
{
}
catch(Exception e)
{
Console.WriteLine(e);
}
VC# Express is a pretty good IDE, you must learn how to use it. You get a very good debugger, at the very least.
|
|
|
|
|
Thanks, I am aware of the try-catch statement, tho it didnt help me so much. Anyway, the problem with the regex has been fixed. The VC# Express is actually a VC++ Express, but I guess C# will work there as well.
Thanks for your help,
Yoni
|
|
|
|
|
How is declared p?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
|
|
|
|
|
I am using the DotNetWikiBot framework[^].
p is of type Page. I dont think this is the problem, since p.text is of type String.
Yoni
|
|
|
|
|
Hi,
when running your code, the text will explode (increase exponentially in the for loop),
until the out-of-memory situation occurs. Just print the length (or the content) after
each iteration.
Check your regular expression, vertical bar (or pipe) is a special character that means OR,
but its left operand is empty???
Luc Pattyn
|
|
|
|
|
Hi,
Thanks for your help. What do you mean "Just print the length or the content"? lenght of content of what? p.text?
Regarding the regular expression, I have pipes because the text has pipes. i.e. that's what I want to replace. When I tried to escape them using "\", the compiler gave me an error - unrecognized escape character. I then tried using "@" but it jammed with an Out-of-memory Exception. I then moved on to a Hex escape, which also gives me this exepction.
Yoni
|
|
|
|
|
1)
to see what goes wrong, look at the intermediate results, so print at least p.text.Lenght,
and if necessary (but this may get very large) p.text itself, or part of it, e.g.
p.text.Substring(0,80)
You may want to create a function that does this in an intelligent way, i.e.
printing length, and full or partial contentdepending on size.
2)
regular expressions use special characters such as \ and | and some more.
to get them literally, you should escape them so to get a | you need a \|
But then the C/C++/C# languages will try to interpret the backslash, so you must
either escape it again (hence \\|) or prefix the entire constant string by a @ sign
(@"...\|...")
3)
I dont think there is a need to use 0x7C when what you want is a vertical bar;
just type | and you will get more readable code.
4)
general advice: if something goes wrong, break it down into smaller pieces, until]
you can easily see where it starts to go wrong. In this particular case:
print intermediate values, reduce the size of the problem (fewer than 20 strings!);
if this does not help, perform some experiments (e.g. on the behaviour of Regex).
Greetings,
:cool:
Luc Pattyn
|
|
|
|
|
Thanks for your help. It turns out the regex was a problem. Indeed - the "\\|" in the regex worked. And regarding 3 you were also correct, just a | did the job as well and made the code more readable.
Yoni
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
