Re: apply foreach in a byte[] ArrayList - C# Discussion Boards

Re: Of course I know that you know, but

9-Oct-07 22:05

Hello,

CPallini wrote:
byte[] myByteArray = cont as byte[];

As the 'as' could also return 'null',

CPallini wrote:
myByteArray[0] = 5;

this could leed to an null ref exception!

All the best,

Martin

Of course I know, but

CPallini9-Oct-07 22:23

CPallini

9-Oct-07 22:23

Of course I know, but I leave all the checking code as an exercise for the reader.
Big Grin | :-D

BTW that's enforce flexibility as you may choose to:

(1) Really write the checking code.
(2) Use a precondition/postcondition approach on your project.
(3) Simply thrust preceeding code (viable only for very small projects).

Cheers
Smile | :)

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.

Martin#9-Oct-07 22:28

9-Oct-07 22:28

, it's deep inside me to allways do an '!=null' check after 'as'.
Big Grin | :-D

All the best,

Martin

Because

CPallini9-Oct-07 22:34

CPallini

9-Oct-07 22:34

Because you got married to strategy no.1 Big Grin | :-D

It's a safe marriage: ALL THE BEST!
Smile | :)

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.

Re: True

Martin#9-Oct-07 22:41

9-Oct-07 22:41

All the best,

Martin

Re: True

Patricio Tapia9-Oct-07 23:01

Patricio Tapia

9-Oct-07 23:01

CHeck my last reply

Works Perfect

now... time to rest Sleepy | :zzz:

Re: True

Martin#9-Oct-07 23:06

Re: apply foreach in a byte[] ArrayList

9-Oct-07 23:06

I'm happy for you!

sleep well!

All the best,

Martin

Martin#9-Oct-07 22:02

Re: apply foreach in a byte[] ArrayList

9-Oct-07 22:02

Hello,

This will work if you only Add "byte[]"'s to your List.

byte[] actArray1 = new byte[5];
byte[] actArray2 = new byte[6];
ArrayList actList = new ArrayList();
 
actList.Add(actArray1);
actList.Add(actArray2);
 
foreach(byte[] actArray in actList)
{
	int length = actArray.Length;
}

But will throw an exception (System.InvalidCastException') if you also add different types to the List:

byte[] actArray1 = new byte[5];
byte[] actArray2 = new byte[6];
Control actControl = new Control();
ArrayList actList = new ArrayList();
 
actList.Add(actArray1);
actList.Add(actArray2);
actList.Add(actControl);
 
foreach(byte[] actArray in actList)  //will throw the exception here
{
	int length = actArray.Length;
}

There for you could use:

byte[] actArray1 = new byte[5];
byte[] actArray2 = new byte[6];
Control actControl = new Control();
ArrayList actList = new ArrayList();
 
actList.Add(actArray1);
actList.Add(actArray2);
actList.Add(actControl);
 
foreach(object actObject in actList)
{
	byte[] actArray = actObject as byte[];
	if(actArray!=null)
	{
		int length = actArray.Length;
	}
}

IF you are using framework > .Net1.1, you could use a generic list.

All the best,

Martin

Patricio Tapia9-Oct-07 22:34

Patricio Tapia

9-Oct-07 22:34

Thanks
Now i'm remember that byte in ArrayList

This is my code:

    class Program<br />
    {<br />
        static void Main(string[] args)<br />
        {<br />
            Program a = new Program();<br />
<br />
            byte[] actArray1 = new byte[5];<br />
            byte[] actArray2 = new byte[5];<br />
            byte[] cant = new byte[5];<br />
            ArrayList actList = new ArrayList();<br />
<br />
            actArray1[0] = 0x6f;<br />
            actArray1[1] = 0x6f;<br />
            actArray1[2] = 0x5f;<br />
            actArray1[3] = 0x6f;<br />
            actArray1[4] = 0x1f;<br />
<br />
            actArray2[0] = 0x6a;<br />
            actArray2[1] = 0x6f;<br />
            actArray2[2] = 0x6f;<br />
            actArray2[3] = 0x6a;<br />
            actArray2[4] = 0x4f;<br />
<br />
            cant[0] = 0x6a;<br />
            cant[1] = 0x6f;<br />
            cant[2] = 0x6f;<br />
            cant[3] = 0x6a;<br />
            cant[4] = 0x4f;<br />
<br />
            actList.Add(actArray1);<br />
            actList.Add(actArray2);<br />
<br />
            foreach (byte[] actArray in actList)<br />
            {<br />
                if (a.AreEqual(actArray,cant))<br />
                Console.WriteLine("same byte array");<br />
            }<br />
<br />
            Console.ReadLine();<br />
        }<br />
        private bool AreEqual(byte[] a, byte[] b)<br />
        {<br />
            if (a.Length != b.Length)<br />
                return false;<br />
            for (int i = 0; i < a.Length; i++)<br />
                if (a[i] != b[i])<br />
                    return false;<br />
            return true;<br />
        }<br />
    }

Protection for excel sheet

iet20009-Oct-07 21:17

iet2000

9-Oct-07 21:17

Hi all,
We are automating an excel sheet using c#.

We provided security to the excel sheet by using protect() method.

The problem is,
the excel sheet can be modified by other unauthenticated users of the system inspite of the protection we provided programatically.

We need to modify the excel sheet only programatically but not manually by opening the excel sheet and modify data in the cells.

We also tried setting the protection level attributes in the excel sheet tools
manually...But we are not satisfied as the protection level attributes can also be changed by others.

Please help us.

Regards,

IET

class problem

ptvce9-Oct-07 21:13

ptvce

9-Oct-07 21:13

explain me secend FDemo , explain that what is it? it has the same name with class:

class FDemo {
int x;
FDemo (int i) {
x = i;

}

Martin#9-Oct-07 21:23

9-Oct-07 21:23

Hello,

It's a parameterised constructor;
The constructor name has to be equal with the class name!

A class can have more than one constructor:

class FDemo
{
    int x;
 
    //default constructor
    FDemo()
    {
    }

    //parameterized constructor, which takes an int
    FDemo(int i)
    {
        x = i;
    }

}

If you now want to instanciate the class you could use:
FDemo fdemo = new FDemo();
or:
int actValue = 5;
FDemo fdemo = new FDemo(actValue);

All the best,

Martin

ptvce9-Oct-07 21:40

ptvce

9-Oct-07 21:40

thanks. but why we use constructor?

Martin#9-Oct-07 21:48

9-Oct-07 21:48

ptvce wrote:
but why we use constructor?

Like I said, to instanciate a class;

Or, do you mean, why we use parameterized constructors?

All the best,

Martin

Re: Blinking a form Alert

Bekjong9-Oct-07 22:00

Bekjong

9-Oct-07 22:00

I think you might want to buy a book on OOP, as this is a very fundamental question to understanding it.

Standards are great! Everybody should have one!

Blinking a form Alert

joemonvarghese9-Oct-07 20:59

joemonvarghese

9-Oct-07 20:59

hi all

i am doing a chatting a softeware and my Qn is how can i blink the form when it receives a message ...i mean if the form is minimized, the form should blink on receiving a message..

Regards

Joemon Varghese

JF201510-Oct-07 0:01

JF2015

10-Oct-07 0:01

Hi,

i can't help you with a blinking form, but what do you think of a blinking notifyIcon? You would just need a timer to change the notifyIcon each second or so.

Regards

What is SSL Encryption means ? how to get ssl encryption

Satish_S9-Oct-07 19:16

Re: What is SSL Encryption means ? how to get ssl encryption

9-Oct-07 19:16

i need to know What is SSL Encryption means ? how to get ssl encryption in page?

sathimailin

N a v a n e e t h9-Oct-07 20:58

N a v a n e e t h

9-Oct-07 20:58

sathimailin1 wrote:
What is SSL Encryption means

SSL is Secure Socket Layer, an encryption mechanism used to send information securely on internet. Basically it holds a public key and a private key.

sathimailin1 wrote:
how to get ssl encryption in page?

You have to install SSL on IIS. And browse your site through HTTPS protocol. If your web applications really needs to send sensitive information like Credit card numbers, you could use SSL. But it always requires more processing overhead and financial overhead.

My Website | Ask smart questions

Re: What is SSL Encryption means ? how to get ssl encryption

Satish_S9-Oct-07 21:12

Re: What is SSL Encryption means ? how to get ssl encryption

9-Oct-07 21:12

Thanks a lot for ur reply and from where i ll get the SSL to install and how to install it on IIS. can u please make me clear.

sathimailin1

N a v a n e e t h9-Oct-07 21:25

N a v a n e e t h

9-Oct-07 21:25

Check this[^] to know about how to install SSL on IIS

My Website | Ask smart questions

Re: What is SSL Encryption means ? how to get ssl encryption

Satish_S10-Oct-07 18:36

Re: What is SSL Encryption means ? how to get ssl encryption

10-Oct-07 18:36

Really good one u linked me and thanks
i voted you 4

sathimailin1

N a v a n e e t h10-Oct-07 22:28

N a v a n e e t h

10-Oct-07 22:28

Thank you

My Website | Ask smart questions

Re:

Satish_S9-Oct-07 21:12