Re: Iterating through Controls on A Form - C# Discussion Boards

Re: tab page questions [modified]

28-Oct-06 8:26

rzvme wrote:
i don't kow how to put the conditio

1)If you use .Net 2.0 there is an event called DataSet.Initialized, and a property called DataSet.IsInitialized. When the Dataset finishes initialization, the event fires, and the property is set to true.

rzvme wrote:
2) I want certain tab pages to be either disabled (I mean to appear on the tab control disabled, not all the controls on it to be disabled) or invisible(likevise)
how do i do that?

2) I don't think I caught up with you, but if I got you right, then you don't want to hide, nor disable the tabpages and the inner controls, yet you still don't want to allow changing the current page. You can handle TabControl.SelectedIndexChanged event, and check IsInitialized in it. If it wasn't true, revert the selected index to the page you desire.

Regards

Re: tab page questions

lainoo28-Oct-06 18:48

lainoo

28-Oct-06 18:48

1) you may write :dataset.tables[tablename].Rows.count!=0
2) tabpagechange event can handle this.

Sorry ...

rzvme28-Oct-06 19:26

rzvme

28-Oct-06 19:26

yes, but how do i get the page(index or name) from wich the index/name was chaged? the tab control doesn't have a last selected page or last selected index property.
Another problem is the fact, i think, the tabcontrol selected index changed occurs after the tabpageenter event.

-- modified at 1:48 Sunday 29th October, 2006

rzvme

programing ocr

ammoh28-Oct-06 3:27

ammoh

28-Oct-06 3:27

in the namr og god
hi.
where i can get (ocr) for programing in mysoftwar?
tankyou.

Re: programing ocr

Nader Elshehabi28-Oct-06 3:54

Iterating through Controls on A Form

28-Oct-06 3:54

You mean you want to make your program an OCR engine? In what language? The easiest way is to use office interop if it has OCR in it. Otherwise you'd have to buy an OCR component.

Regards

AJ12328-Oct-06 3:21

AJ123

28-Oct-06 3:21

Hi There....

I am looking to iterate through A form's Controls collection. However i am also interested in control which are the child of panels. Is there any built support in WinForms? Or is the solution just to write my own little recursive method?

Thanks in advance
Aj

Robert Rohde28-Oct-06 3:31

Robert Rohde

28-Oct-06 3:31

Hi,

yes recursion is the way to go:

private void LoopThroughControls(Control c) {
   foreach (Control subControl in c) {
      //do something with c

      LoopThroughControls(c);
   }
}

Within your Form just call: LoopThroughControls(this);

Robert

AJ12328-Oct-06 3:40

AJ123

28-Oct-06 3:40

Thanks Robert - Quite an elegant little solution there.... Smile | :)

lainoo28-Oct-06 19:16

lainoo

28-Oct-06 19:16

private void button3_Click(object sender, EventArgs e)
{
treeView1.Nodes.Add(LoopThroughControls(this));
}
private TreeNode LoopThroughControls(Control c)
{
TreeNode node = new TreeNode(c.Name);
Control ctemp;
for(int i=0;i<c.controls.count;i++)
{
="" ctemp="c.Controls[i];
" if="" (ctemp.haschildren)
="" node.nodes.add(loopthroughcontrols(ctemp));
="" }
="" else
="" node.nodes.add(ctemp.name);
="" return="" node;
="" }

if="" you="" want="" to="" write="" xml="" for="" all="" propertys="" of="" controls="" form="" ,="" i="" may="" do...=""

<div="" class="ForumSig">Ok ...

Communicating from e.g. shortcuts to a form

Robert Rohde28-Oct-06 19:48

Robert Rohde

28-Oct-06 19:48

What exactly are you trying to tell me with this?

Robert

phiamo28-Oct-06 1:45

phiamo

28-Oct-06 1:45

hi,
i would like to know how i can communicate from e.g. windows shortcuts or context menu items in windows to my program ...
i think i will have a installer finally creating these and adding some registry values and they should e.g give me the location where e.g. the windows explorer is active atm ... ?
something like a context menu extension...
dont know where start searching ...
thanks a lot!
cheers phil

Re: Communicating from e.g. shortcuts to a form

Nader Elshehabi28-Oct-06 1:50

How to write array of strings on a binary file

28-Oct-06 1:50

I think you mean shell extensions.

These series of articles may be a good start. Click here[^].

Regards

Bahaa Hany28-Oct-06 1:15

Bahaa Hany

28-Oct-06 1:15

that the code i wrote
FileStream w = new FileStream("d:\\HufmanCompression.txt",FileMode.Create);
BinaryWriter writer = new BinaryWriter(w);
for (i = 0; i < array.Length;i++ )
writer.Write(array[i]);
w.Close();

The output i need is to write a binary file with a very small size(it is a compression prog)

thanx for ur time

Guffa28-Oct-06 1:43

Guffa

28-Oct-06 1:43

And the problem is...?

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Nader Elshehabi28-Oct-06 1:46

28-Oct-06 1:46

I don't seem to see a question in your message? What's your problem exactly? Your code is one way of doing it. What's wrong with it?

Ps.
Make sure to call writer.Flush() at the end of your code before slocing the stream.

Regards

S. Senthil Kumar28-Oct-06 3:36

S. Senthil Kumar

28-Oct-06 3:36

Doesn't Close flush the stream?

Regards
Senthil [MVP - Visual C#]
_____________________________
My Blog | My Articles | WinMacro

Nader Elshehabi28-Oct-06 3:49

28-Oct-06 3:49

Well, in his case Close() will flush the FileStream, but not the BinaryWriter. So I suggested that he'd call writer.Flush() to flush the BinaryWriter too.

Regards

Guffa28-Oct-06 4:29

Guffa

28-Oct-06 4:29

But he's closing the writer. That flushes the writer, closes the writer, flushes the stream and closes the stream.

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Nader Elshehabi28-Oct-06 4:40

28-Oct-06 4:40

IIRC he called

w.Close();

and w is the FileStream. How does that close the BinaryWriter -named in his code writer-?

Regards

Get Table Fields Description

Guffa28-Oct-06 5:10

Guffa

28-Oct-06 5:10

Yes, you are right in that. I didn't read the code thorougly enough, and was confused by the naming of the variables and what the code really should have been doing. He closes the stream when he should really close the writer instead.

The best way is of course to close the writer, not the stream:

writer.Close();

If you close the stream, you can solve the problem with the buffering in the writer by flushing the writer first, but it still leaves the writer in a confused and unusable state when the stream is closed.

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freshonlineMax28-Oct-06 0:55

freshonlineMax

28-Oct-06 0:55

Hi I want to get sql server table fields Description, I want to use them for my datagrids header text.
So how can i get field description from database table?
Tanks

Re: Get Table Fields Description

Nader Elshehabi28-Oct-06 1:53

Re: Get Table Fields Description

28-Oct-06 1:53

freshonlineMax wrote:
I want to get sql server table fields Description

What makes you think there ought to be one? Take a look at DataColumn class in your documentation, you'll see it has no description member. I usually name my columns in the database in a human friendly way so that I'd name the DataGridColumns with the same string using a loop -with some modifications of course like removing underscores-.

Regards

Robert Rohde28-Oct-06 3:33

Robert Rohde

28-Oct-06 3:33

Just because the DataColumn class doesn't have such a property doesn't mean there is now way to get this info...

Robert

Re: Get Table Fields Description

Nader Elshehabi28-Oct-06 3:51