C# Discussion Boards - CodeProject

Re: System.NullReferenceException occurred in Unknown Module

Robert Rohde22-Mar-05 2:05

22-Mar-05 2:05

Sounds really strange...

I would do the following: Surround your ShowDialog call with a try catch block and look at the stack of the exception (and post it here). This will hopefully give further hints.

<br />
try {<br />
editAccount.Show();<br />
} catch (Exception exc) {<br />
Console.WriteLine(exc.StackTrace);<br />
}<br />

Re: System.NullReferenceException occurred in Unknown Module

AO-Action22-Mar-05 2:31

AO-Action

22-Mar-05 2:31

Thanks alot Rohde for your reply,
I did and the same message still comming

hopefully that the framework 1.1 SP1 will solve this problem, Microsoft mentioned some NullReferenceException errors were fixed in this SP, I hope I didn't install this fix before but anyway assume that the problem remains even after I installed the SP, any ideas?

and if this fix did the job I'll report back Smile | :)

How to get text on screen

levgiang22-Mar-05 0:39

levgiang

22-Mar-05 0:39

How can i write a program can get text at current mouse position

le van giang

Re: How to get text on screen

leppie22-Mar-05 1:07

leppie

22-Mar-05 1:07

With great difficulty. The only way to do it generically is to do OCR.

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Re: How to get text on screen

Dave Kreskowiak22-Mar-05 4:48

Dave Kreskowiak

22-Mar-05 4:48

And I think I've told you this before...

And leppie's comment "with great difficulty" is an understatement!

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

list view goes blank

maheshfour21-Mar-05 23:12

maheshfour

21-Mar-05 23:12

hi all,

I am facing with an unusual problem. i am doing a project involving TCP/IP packet capturing. I display the packets in a list view. it works most of the times except the first time.

For the first time when i click start button the list view goes blank. after that it works properly.

can any one help me?

Re: list view goes blank

Dave Kreskowiak22-Mar-05 4:45

Dave Kreskowiak

22-Mar-05 4:45

That depends entirely on how your filling the ListView while your capturing packets. Are you letting the ListView update itself after filling it with data? Is your packet capture process running on the same thread of the UI? If so, then you're going to have to call Application.DoEvents to let the Window and it's controls redraw themselves. A better method would be to run the capture process on a seperate thread and have it post calls back to the Window with the ListView telling it to add the data, possibly using an event.

Also, consider that you can't possibly update the ListView fast enough to post every packet that flies by as it does so. You might want to hold off updating the ListView until the capture is finished, then you can populate the ListView however you want.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

tabs in tree view

Anonymous21-Mar-05 23:05

Anonymous

21-Mar-05 23:05

hi friends,

how can i indent the data ( nodes ) in a tree view using tab. I tried using "\t" in the node string, but it displays a square character in the node instead of indenting.

mahesh

Re: tabs in tree view

Dave Kreskowiak22-Mar-05 4:39

Dave Kreskowiak

22-Mar-05 4:39

The TreeView doesn't support the Tab character. You'll either have to TRY prepending the strings with Space characters or do without. Since it's a TreeView that already does indenting for child nodes, I really have a hard time thinking of a good reason to use such formatting...

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

file system protection

computer_eng21-Mar-05 22:52

computer_eng

21-Mar-05 22:52

Hi ineed help about hoe i can write code in c# that protect my file and folder from delete and write and if i want protect file from open.... thanks for any one help me

Re: file system protection

James Poulose21-Mar-05 23:37

James Poulose

21-Mar-05 23:37

WHy don't you try the FileSystemWatcher namespace ?

James

Re: file system protection

Anonymous22-Mar-05 22:01

Anonymous

22-Mar-05 22:01

thank you for response but i try but this name space
give you tha ability to rebort about chang after it happend

Re: file system protection

Dave Kreskowiak22-Mar-05 4:37

Dave Kreskowiak

22-Mar-05 4:37

You'll have to write a file system extension to accomplish this. This is NOT a project for the faint of heart or weak in COM Interop and NTFS extension skills.

Here's a better idea. Just use the normal NTFS Security permissions. The requirements you specified are exactly what Security is for.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: file system protection

Anonymous22-Mar-05 22:47

Anonymous

22-Mar-05 22:47

thank you for your response and thank you for your advice
but how i can write code in c# that help me to do the security using ntfs;)

Re: file system protection

Dave Kreskowiak23-Mar-05 0:43

Dave Kreskowiak

23-Mar-05 0:43

You wouldn't have to. I really can't give you the details because you haven't said what files and folders your trying to protect or under which folders any of this stuff is stored.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Fit together two controls

jetli_bos21-Mar-05 20:48

jetli_bos

21-Mar-05 20:48

Fit_Together(Control c1, Control c2)
i need to write a function which moves the control c2 close to c1 ...
could anyone give me some tips regarding this or maybe post a method which implements that.
Im thankful for every help!

Best regards
denis

Re: Fit together two controls

Colin Angus Mackay21-Mar-05 21:08

Colin Angus Mackay

21-Mar-05 21:08

Why don't you wrap the two controls into a new custom control that you create yourself?

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Re: Fit together two controls

MoustafaS21-Mar-05 21:32

MoustafaS

21-Mar-05 21:32

You can write in the event that you want that fitting to be fired that code:

//on the event here<br />
private void Onfitting()<br />
{<br />
    Point Differnce = new Point()<br />
    Control1.Location = new Point(0,0);<br />
    Control2.Location = new Point(Control2.Location.X-theDeffernceBetweenthem.X,Control2.Location.Y-theDeffernceBetweenthem.Y);<br />
}

How to export an image to MS Excel&#65311;

welsrping21-Mar-05 20:19

welsrping

21-Mar-05 20:19

Hi everyone，
I want to export some data to a Excel file. I can export data in a DataTable to the file while images can't be exported. If you have some methods, please tell me. Thanks a lot.
In addition, how to put data in a merged cell?
Thanks
welsrping

hope for help

video conference project

shumyla198321-Mar-05 16:54

shumyla1983

21-Mar-05 16:54

plz give me some examplees of audio and video which are not included in 3rd party as early as possible.thanx

shumyla

Re: video conference project

Dave Kreskowiak22-Mar-05 4:33

Dave Kreskowiak

22-Mar-05 4:33

Please to be searching Yahoo or Google for code.

We will help you with your code, but will not give you any. You don't learn anything that way...

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

video conference project

shumyla198321-Mar-05 16:52

shumyla1983

21-Mar-05 16:52

plz send me some examples related to send audio(convert voice to wav file) and video(convert picture or video to avi file)in c#.

shumyla

RemovePreviousVersions Feature

azusakt21-Mar-05 16:44

azusakt

21-Mar-05 16:44

Hi all,

I have one question about setting up the installer. I've set the RemovePreviousVersions of installer to true, and have changed the installer version every new release(it also changed the product code).
However, the installer still can't detect the pervious version of application. Do I miss any important steps?

Could you please hlep.

Regards

Re: RemovePreviousVersions Feature

leppie21-Mar-05 18:08

leppie

21-Mar-05 18:08

I had the same problem. IIRC the version numbers need to be incremented too, but in my case it didnt work. Some silly issue with MSI not checking the entire version 'string' (0.0.0.1 -> 0.0.0.2 didnt work).

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Re: RemovePreviousVersions Feature

azusakt21-Mar-05 19:15

azusakt

21-Mar-05 19:15

for me, my previous version number of installer is set to 2.1.0
now I set the installer version to 2.1.9 , it still doesn't work.

A strange issue, I was changed back the RemovePreviousVersions to false, however, the installer will go to install page without any prompting. As it will ask user to remove pervious before, now it can't.

I really don't know how to solve.

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