Urgent Regualr Expression Help Needed - C# Discussion Boards

Re: question about Arrays

User 665817-Oct-05 6:34

User 6658

17-Oct-05 6:34

You can use the ArrayList-class

regards

modified 12-Sep-18 21:01pm.

Re: question about Arrays

Green Fuze17-Oct-05 7:02

Green Fuze

17-Oct-05 7:02

thanks!

Re: question about Arrays

dwatkins@dirq.net17-Oct-05 6:55

dwatkins@dirq.net

17-Oct-05 6:55

You can use a hash table for this as well. Here is an example:

<br />
Hashtable hash = new Hashtable();	<br />
for (int i=0; i<10; i++){			<br />
	hash.Add(KeyHere, ValueHere);		<br />
}<br />

Replace the KeyHere and ValueHere...

Dirk Watkins

Re: question about Arrays

Green Fuze17-Oct-05 7:10

Green Fuze

17-Oct-05 7:10

now, thats a nice.
I''ve never used a hashtable, but I guess I will now Smile | :)

thx!

Re: question about Arrays

Dan Neely17-Oct-05 7:56

Dan Neely

17-Oct-05 7:56

You do take a fair amount of memory overhead with a hashtable. The runtime keeps it at roughly 50% capacity for speed reasons. The advantage is that if you're modifying data regularly you don't need to resort with each insert. Search times are comparable with a sorted array.

Re: question about Arrays

S. Senthil Kumar17-Oct-05 15:18

S. Senthil Kumar

17-Oct-05 15:18

dan neely wrote:
Search times are comparable with a sorted array.

Not really, Hashtable search times are constant on average.

Regards
Senthil
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Re: question about Arrays

futbolkeeper17-Oct-05 16:08

futbolkeeper

17-Oct-05 16:08

What about if you use an ArrayList? It should automatically change size when adding data to it. And when you declare the array you don't have to specify the size.

ArrayList list = new ArrayList();

Urgent Regualr Expression Help Needed

Brian Van Beek17-Oct-05 5:14

Brian Van Beek

17-Oct-05 5:14

Hello,

I need to know how to only match if a word does not appear before the selected word.

For example, I have the sentence "there is a brown fox over there".

The word I'm trying to match would be, say "fox". However, I only want to match "fox" if the word "brown" does not appear directly before it. Any help would be greatly appreciated.

So the sentence above would not match, however the sentence "there is a fox over there" would match.

Thanks folks!

Brian Van Beek
Here's my boring blog! [^]

-- modified at 11:15 Monday 17th October, 2005

Re: Urgent Regualr Expression Help Needed

User 665817-Oct-05 6:21

User 6658

17-Oct-05 6:21

[^brown](\s|\t)+fox

That works

modified 12-Sep-18 21:01pm.

Re: Urgent Regualr Expression Help Needed

Brian Van Beek17-Oct-05 7:06

Brian Van Beek

17-Oct-05 7:06

thanks!

Brian Van Beek
Here's my boring blog! [^]

Re: Urgent Regualr Expression Help Needed

leppie17-Oct-05 8:15

leppie

17-Oct-05 8:15

Greeeg wrote:
That works

I highly doubt that! [^brown] means 'one character NOT any of (b,r,o,w,n)'.

^{xacc-ide 0.0.99-preview5 now with C#, C, IL, XML, Nemerle, IronPython and Boo highlighting support!}

Re: Urgent Regualr Expression Help Needed

User 665817-Oct-05 9:06

User 6658

17-Oct-05 9:06

Well, to be honest I was not completely sure about that. Blush | :O

How to do this correctly? I tried (word){0}, but that doesn't work.

modified 12-Sep-18 21:01pm.

Re: Urgent Regualr Expression Help Needed

Daniel Turini17-Oct-05 9:44

Daniel Turini

17-Oct-05 9:44

You need to use a Negative Lookbehind.
(?<!brown)\s+fox

Re: Urgent Regualr Expression Help Needed

leppie17-Oct-05 10:22

leppie

17-Oct-05 10:22

Greeeg wrote:
How to do this correctly?

I would use explicit captures, eg:

(?<brown>brown)\s+(?<fox>fox)

Match m = Regex.Match();
return m.Groups["brown"].Success && !m.Groups["fox"].Success;

or even easier:

return !Match("brown\s+fox");

^{xacc-ide 0.0.99-preview5 now with C#, C, IL, XML, Nemerle, IronPython and Boo highlighting support!}

Drawing over a picturebox

budidharma17-Oct-05 4:55

budidharma

17-Oct-05 4:55

I have a c# program I've been writing which dynamically loads an image. It also dynamically loads an xml file which defines rectangles within the image. Each xml entry defines the upperleft coordinate on the image, and the width and height of the rectangle.

What I need to do, is create outlines on the picturebox for each entry in the xml file. I'm not sure how to do this.

Basically, over my loaded image, if there is an entry in the xml file, for example: 10,10, 50, 50 ...
I need to draw a rectangle (outline, or full but semitransparent) over the picturebox at coordinates 10,10 width a height of 50 and width of 50.

I've no idea where to start.
Any help?
Thanks.

Re: Drawing over a picturebox

Rick Beideman17-Oct-05 6:49

Rick Beideman

17-Oct-05 6:49

Here is some code used in a paint event. If it is not in an event with PaintEventArgs you will need to get a Graphics object in another way.

private void Image_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{

Rectangle selRect = new Rectangle(0,0,0,0);
Graphics selGraphics = null;

int lineThickness = 2;
selGraphics = e.Graphics;
selRect.X = 10;
selRect.Y = 10;
selRect.Width=50;
selRect.Height=50;

Pen selPen = new Pen(Color.Black, lineThickness);
selGraphics.DrawRectangle(selPen, selRect);
}

add a delay before updating a file.

Dan Neely17-Oct-05 4:38

Dan Neely

17-Oct-05 4:38

I'm using a FileSystemWatcher to detect changes made to files in a shared directory and have the app update it's internal copy of them. Rarely it detects a change and attempts to open the file to read the update before the instance of the app doing the changes has closed the file and throws an exception. I'd like to have the app wait a few seconds, and then retry loading the file, but am not sure how to do so.

Re: add a delay before updating a file.

S. Senthil Kumar17-Oct-05 5:07

S. Senthil Kumar

17-Oct-05 5:07

You can try using Thread.Sleep[^] to "wait" for a few seconds before retrying. Something like

while (conditionNotMet)
{
   Thread.Sleep(time);
   conditionNotMet = evaluateCondition();
}

Regards
Senthil
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Re: add a delay before updating a file.

Dan Neely17-Oct-05 6:56

Dan Neely

17-Oct-05 6:56

That should work I guess, but I was hoping to keep the app singlethreaded for simplicity.

Re: add a delay before updating a file.

S. Senthil Kumar17-Oct-05 15:14

S. Senthil Kumar

17-Oct-05 15:14

It still is single threaded, Thread.Sleep suspends the current thread for a particular amount of time.

Regards
Senthil
_____________________________
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Update Form while Retaining Access to It

thepolishguy17-Oct-05 3:40

thepolishguy

17-Oct-05 3:40

I need to update a C# form with values read to it from another program in addition to changes from C# code while retaining the ability to edit text/combo boxes on a different part of the form from the updates. Right now, I can get the updates running, but am denied access to the form while the updates are occurring. How can I achieve this functionality?

Create an object dynamically for COM component witout reflection

Member 227350917-Oct-05 3:14

Member 2273509

17-Oct-05 3:14

Hi Guys,
How can we create an object for vb dll without reference and reflection in c#.
In VB.Net we have a method CreateObject(), but in C# we don't have such method. How can we achieve this in C#.

Raghuram

Re: Create an object dynamically for COM component witout reflection

S. Senthil Kumar17-Oct-05 5:27

S. Senthil Kumar

17-Oct-05 5:27

AFAIK, CreateObject also uses reflection like techniques to do its job.

I'm not sure how you can do without adding a reference, because C# is a statically typed language, which means that you have to have a type definition to compile.

Regards
Senthil
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convert int to hexadecimal

Sasuko17-Oct-05 3:10

Sasuko

17-Oct-05 3:10

how?

Re: convert int to hexadecimal

Rob Philpott17-Oct-05 5:10

Rob Philpott

17-Oct-05 5:10

http://www.codeproject.com/csharp/hexconverter.asp[^]

Rob Philpott

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