C# Discussion Boards - CodeProject

Re: Saveing tabs and content when closing app

SilverAdder30-Jun-08 7:41

SilverAdder

30-Jun-08 7:41

Man that is one advanced program! For my standards atleast Smile | :)

But it helped me alot actually. I think i get what you are doing when you save the file paths and serialize them to be used later. The thing is, i dont know how to do that with my tabs. When i choose to save the tabs i dont know how to get the tabs and the contents of the tabs. Is there some way to get all the tabs in the tab control, and the contents of the tabs (text in text boxes and such)?

I haven't lost 'till I'm the last one to cross the finishline.

Re: Saveing tabs and content when closing app

Giorgi Dalakishvili30-Jun-08 8:21

Giorgi Dalakishvili

30-Jun-08 8:21

TabPageCollection returns all the tabs in tab control. In order to get contents of the tab, you can build your own class to hold data and use databinding so that it will be automatically populated by the values of the controls on the tabpage.

Giorgi Dalakishvili

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communicate with windows

Shaahinm28-Jun-08 9:58

Shaahinm

28-Jun-08 9:58

hi,
I want to write a program or a service which disconnect a dial up connection whenever for example the mouse doesn't move for 5 minutes or ...
please help me on this.
please tell in what library's i can find useful things.
thanks

Re: communicate with windows

subai28-Jun-08 18:04

subai

28-Jun-08 18:04

for the dial up part you can use WinInet API
this may help http://www.developerfusion.co.uk/show/1920/3/[^]

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How to get a file name from a FileDialog?

Admin88728-Jun-08 9:52

Admin887

28-Jun-08 9:52

I know that there is a possibility to get the name of the file after choosing it in the FileDialog, like this:

String str=fileDialog1.fileName()

The String(str) includes the full address of the file.
for example:

str="c:\windows\system\abc.txt"

but i want only the file name(abc.txt). Confused | :confused:

how can i receive only the file name and not the full address?

thank you
G.

Re: How to get a file name from a FileDialog?

Shaahinm28-Jun-08 10:15

Shaahinm

28-Jun-08 10:15

use safefilename like this

DialogResult dr= openFileDialog1.ShowDialog();
            if(dr==DialogResult.OK)
                MessageBox.Show(openFileDialog1.SafeFileName);

Re: How to get a file name from a FileDialog?

Luis Alonso Ramos28-Jun-08 16:08

Luis Alonso Ramos

28-Jun-08 16:08

Try Path.GetFileName[^] passing the full path you get from the file dialog. Also see other static methods in the Path[^] class in case you are interested.

Luis Alonso Ramos
Intelectix
Chihuahua, Mexico

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Re: How to get a file name from a FileDialog?

Sajjad Izadi29-Jun-08 7:28

Sajjad Izadi

29-Jun-08 7:28

hi,
you can also use 'FileInfo' class to get some information of your file in the given path.

Explicit assignment of method return value

Alan N28-Jun-08 8:03

Alan N

28-Jun-08 8:03

If I have method with a non void return type is there a way to make the compiler check that the returned value has been explicitly assigned?

e.g.
When the method signature is

int DoSomething(int inValue);

Can the intended usage of

int retVal = DoSomething(iv);

in contrast to

DoSomething(iv);

actually be enforced.

I'd like a compiler warning for this situation but I haven't found one.

Alan.

Re: Explicit assignment of method return value

Luc Pattyn28-Jun-08 9:37

Luc Pattyn

28-Jun-08 9:37

Hi,

there is no such thing, a method will execute when called, whether the return value is
used somehow or not; so you can not enforce its use.

The situation is different with a property: you can not invoke a property unless
you either assign it a value (setter) or read AND use its value (getter).

Smile | :)

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Re: Explicit assignment of method return value

Alan N29-Jun-08 2:32

Alan N

29-Jun-08 2:32

Thanks for the response. You confirmed that the situation is as I had thought it to be, in that the use of the returned value is optional and cannot be checked.

Alan.

Inserting an SWF file into a web application

WebMaster28-Jun-08 6:54

WebMaster

28-Jun-08 6:54

How may I add an swf file into a web application in aspx file so that it will start running when an specific buttun is pressed(a button except of the swf link).

Re: Inserting an SWF file into a web application

subai28-Jun-08 18:13

subai

28-Jun-08 18:13

I'm not sure how to communicate between swf and asp events but one approach could be for example displaying an image instead of swf and when the button is pressed load the swf by any mean you want

I Wish the Life Had CTRL-Z
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How Can i Copy Object?!

Admin88728-Jun-08 6:22

Admin887

28-Jun-08 6:22

My Code in C#:

Object o1=new Object();
Object o2;

How can i copy the o2 object to be exactly like o1( no a reference. o2=o1 is reference).

i tried o2.copy(o1) or something like this but the method "copy" does not exist Dead | X|

;

Can you help me?

Re: How Can i Copy Object?!

Karthik Kalyanasundaram28-Jun-08 6:27

Karthik Kalyanasundaram

28-Jun-08 6:27

You can create an exact copy of the object using Clone() method if that type implements ICloneable interface

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Re: How Can i Copy Object?!

Admin88728-Jun-08 6:43

Admin887

28-Jun-08 6:43

by the way, i am using Visual Studio 2008.

what do you mean type? which type?

i added "ICloneable" here:

public partial class Form1 : Form,ICloneable
{
     Object o1=new Object();
     Object o2;
     
     // o2.clone() does not exist:mad:
}

Thanks you

Re: How Can i Copy Object?!

Colin Angus Mackay28-Jun-08 10:20

Colin Angus Mackay

28-Jun-08 10:20

Admin887 wrote:
// o2.clone() does not exist

It doesn't help if you appear to be angry with the person that tried to help you. Especially, when it seems you have misunderstood that assistance.

You cannot clone a System.Object because it does not implement ICloneable. Adding it to the Form1 class will not help, it only demands that you provide an implementation for the Form1 class.

Admin887 wrote:
what do you mean type? which type?

A "type" in .NET can be a class, a struct, an enum, and so on.

The "type" the person was referring to was the type of the object which you are trying to clone. You can only add ICloneable to types that you create. You cannot add it to existing types.

Now, what do you really want to do? Creating a System.Object is generally not a very useful thing to do.

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Re: How Can i Copy Object?! [modified]

Admin88728-Jun-08 23:23

Admin887

28-Jun-08 23:23

First of all, i am very sorry, really.unintentionally i added this smile. I do not mean it. i am very nice guy Big Grin | :-D

And now to the question:
I created a GroupBox(groupBox1) that contains textBox and buttons(i created this with the design option on the Form).

i want to create a new Tab(only with code without designing) that contains gruopBox(g) exactly like groupbox1.

GroupBox g = new GroupBox();
// g=groupbox1 will be Reference;
// i want that 'g' will be like 'groupbox1'

Thank you for your attention
G.

modified on Sunday, June 29, 2008 5:30 AM

Reporting system information, operating system, ram, installed applications such as Oracle and versions??

RichardContact-128-Jun-08 6:20

RichardContact-1

28-Jun-08 6:20

Hello all

I am hoping someone can help me here as I have been asked to write a little application which will report on the machine it is installed information such as operating system, ram, pagefile, whether oracle is installed and what version, etc, etc

I was hoping people would have any useful suggestions of how they think I can get all this information using C# as I am not sure, I was thinking of maybe the registy for some things but was hoping someone had some better suggestions.

Thanks in advance for any help that can be offered

Compressing multiple files and crypto question

PetePetePete28-Jun-08 5:24

PetePetePete

28-Jun-08 5:24

Hey all, first-time-poster long-time-reader, etc. Wink | ;-)

I have already managed to use CryptoStream and FileStream to encrypt an individual image into another single file, and also then used CryptoStream, MemoryStream and then Image to decrypt and display the image in a picturebox on a form. This way none of the data is actually stored, unencrypted, on the hard drive (unless the user hibernates the machine with it in memory) - this is very important.

However, what I want to do is to 'import' multiple images into one (preferably compressed) file - so I need to concatenate them somehow and then run compression on them. This file needs to then be able to be unencrypted, decompressed and split back into the respective images, providing the user the ability to view each image.

Please note: I can't use temporary files, everything up until the saving of the one main encrypted file needs to be done in memory.

I don't know where to start, just wondering if anyone could point me in the right direction?

How can we select XML's root node with LINQ ?

Mohammad Dayyan28-Jun-08 3:20

Mohammad Dayyan

28-Jun-08 3:20

Hi friends.
I have a XML file like this :

<?xml version="1.0" encoding="utf-8"?>
<root ELEMENTS="11">
	<BOOKMARK1 ID="1"  />
    <BOOKMARK1 ID="2"  />
    	<BOOKMARK1 ID="3"  />
        <BOOKMARK1 ID="4"  />
        <BOOKMARK1 ID="5"  />
    <BOOKMARK1 ID="6"  />
    	<BOOKMARK1 ID="7"  />
        <BOOKMARK1 ID="8"  />
    <BOOKMARK1 ID="9"  />
    <BOOKMARK1 ID="10"  />
    <BOOKMARK1 ID="11"  />
</root>

;

I want select root's ELEMENTS attribute value.
I used this code :

X_Element = XElement.Load(FileName);
MessageBox.Show(X_Element.Nodes().First().Parent.Attribute("ELEMENTS").Value.ToString());

Is there a better way or this way is good for my work ?

Freshman

Re: How can we select XML's root node with LINQ ?

Colin Angus Mackay28-Jun-08 3:37

Colin Angus Mackay

28-Jun-08 3:37

M-Dayyan wrote:
Is there a better way or this way is good for my work ?

Yes, you need to pay attention to what you are doing and to what each of the objects already are.

I'm curious to know what your thought process of this was:

X_Element.Nodes().First().Parent

Becuase all that code does is get you back to the starting point. In other words:
X_Element == X_Element.Nodes().First().Parent

Also, the Value property on XAtribute already returns a string, so why redundantly call ToString() on it again?

Your code could be reduced to: