Initialize array in one line / in a single statement - C# Discussion Boards

Not Active22-Jun-10 15:22

22-Jun-10 15:22

READ THE DAMN GUIDELINES

Do not remove or empty a message if others have replied.

What part of this is not getting through to you?

I know the language. I've read a book. - _Madmatt

Closing windows explorer

teknolog12322-Jun-10 6:00

teknolog123

22-Jun-10 6:00

hi, I'm able to close all processes including IE but I can not close the file explorer windows. They are not process I think because I can't see them among the processes. Any clue welcomed, thanks

Re: Closing windows explorer

Abhinav S22-Jun-10 6:07

Abhinav S

22-Jun-10 6:07

Found this somewhere - you can probably try it out.
I don't know if this will work though.

int myHandle;<br />
while ((myHandle = Win32.FindWindow("ExploreWClass", null)) > 0)<br />
{<br />
Win32.SendMessage(myHandle, Win32.WM_SYSCOMMAND, Win32.SC_CLOSE, 0);<br />
}

Quidquid latine dictum sit, altum videtur.

Whatever is said in Latin sounds profound.

Re: Closing windows explorer

teknolog12322-Jun-10 6:26

teknolog123

22-Jun-10 6:26

thanks, I've seen and tried that but even though I can find the Win32 namespace, FindWindow() method is absent.

Re: Closing windows explorer

David Knechtges22-Jun-10 7:17

David Knechtges

22-Jun-10 7:17

Then you should pinvoke FindWindow and SendMessage - those should be on www.pinvoke.net with examples of how to use them.

Re: Closing windows explorer

Daniel Grunwald22-Jun-10 9:05

Daniel Grunwald

22-Jun-10 9:05

Like most P/Invoke examples on the net, that one won't work on 64-bit Windows. The return type of FindWindow[^] is HWND, which must be represented as IntPtr in .NET. Using int for HWND will truncate the handle's value if you're lucky; and if you're unlucky it will mess up stack alignment and cause your program to crash in an unrelated location some time later.

OAuth help

Etienne_12322-Jun-10 4:33

Etienne_123

22-Jun-10 4:33

Hi
I'm creating a desktop application that will act as a portal to various other services. One of these services include GMail. How can I implement Single Sign On so that users can log in to the portal and access their email straight from there without loggin in again? I know that I have to use Google's implementation of OAuth to achieve this, but I can't find any good examples anywhere. Has anyone got some tips?

At the moment I'm trying to request a token. I have to create a call to OAuthGetRequestToken, but how do I create this call?? Is it as simple as webBrowser.Navigate("https://www.google.com/accounts/OAuthGetRequestToken"). I also have to pass in parameters such as oauth_consumer_key. Again, where do I get this key? And how do I pass it in as a parameter? I'm totally clueless here and any hints/examples would be appreciated

Initialize array in one line / in a single statement

NetQuestions22-Jun-10 2:44

NetQuestions

22-Jun-10 2:44

Hi,

I want to initialize a string array with "*".

I want to know if I can avoid using a for loop to do the same.

In the below example I have used a for loop. Can the same done in one line???

The following code will help me generate fibonacci series

public static int Fibonacci(int n)
{
     int previous = -1;
     int result = 1;
     for (int i = 0; i <= n; ++i)
     {
         int sum = result + previous;
         previous = result;
         result = sum;
     }

     //
     // declare an array of size 'result'
     // use a for loop and initialize each entry of array with a "*"
     //
}

Re: Initialize array in one line / in a single statement

sanforjackass22-Jun-10 2:51

sanforjackass

22-Jun-10 2:51

what is this!!!

EASY COME EASY GO

Re: Initialize array in one line / in a single statement

Ennis Ray Lynch, Jr.22-Jun-10 3:06

Ennis Ray Lynch, Jr.

22-Jun-10 3:06

new String('*', 10).ToCharArray();

Need custom software developed? I do custom programming based primarily on MS tools with an emphasis on C# development and consulting.

A man said to the universe:
"Sir I exist!"
"However," replied the universe,
"The fact has not created in me
A sense of obligation."
--Stephen Crane

Re: Initialize array in one line / in a single statement

Luc Pattyn22-Jun-10 3:23

Luc Pattyn

22-Jun-10 3:23

Close but no cigar. That results in a char[], not a string[].

string[] sa=new string('*', n).Replace("*", ".*").Split(".".ToCharArray(),StringSplitOptions.RemoveEmptyEntries);

is one way of getting it done.

string[] sa=new string('*', n).Replace("*", ".*").Substring(1).Split('.');

is an alternative.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use < PRE > tags for code snippets, it preserves indentation, and improves readability.

Re: Initialize array in one line / in a single statement

Ennis Ray Lynch, Jr.22-Jun-10 3:29

Ennis Ray Lynch, Jr.

22-Jun-10 3:29

Happy :p

string[] arr = new string[0];
for(int i = 0; i < 10; i++) {
    string[] temp = new string[arr.Length+1];
    Array.Copy(arr, temp, arr.Length);
    temp[arr.Length] = "*";
    arr = temp;
}

Re: Initialize array in one line / in a single statement

NetQuestions22-Jun-10 3:33

NetQuestions

22-Jun-10 3:33

That was awesome Stephen. Thanks

I never knew that an array can be instantiated with a new kewword.

I have incorporated your suggestion in my application.

I am now using "char[] str7 = new String('*', result).ToCharArray()"

This should handle one part of my application.

I have one more question.

Is it possible to convert this array of characters to a string?

something like reverse of what you showed me.

regards,
Netquestions

Re: Initialize array in one line / in a single statement

Pete O'Hanlon22-Jun-10 4:19

Pete O'Hanlon

22-Jun-10 4:19

His name's not Stephen. I can understand the confusion, but the Stephen referred to in his signature relates to the author of the quote.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: Initialize array in one line / in a single statement

Luc Pattyn22-Jun-10 4:31

Luc Pattyn

22-Jun-10 4:31

I prefer Denny Crane anyway.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use < PRE > tags for code snippets, it preserves indentation, and improves readability.

Re: Initialize array in one line / in a single statement

sidbaruah23-Jun-10 0:56

sidbaruah

23-Jun-10 0:56

Something like this -

string aaa = new string(str7, 0, str7.Length);

would return you a string of "***", if thats What u're looking for. Smile | :)

I was born dumb!!
Laugh | :laugh:

Programming made me laugh Laugh | :laugh:

!!!
--sid--

Re: Initialize array in one line / in a single statement

Luc Pattyn22-Jun-10 3:26

Luc Pattyn

22-Jun-10 3:26

there isn't a straightforward formula that yields Fibonacci numbers without iterations; the closest you can get AFAICT is by using Binet's formula (see here[^]) but for large numbers that will be an approximation as it relies on floating-point arithmetic.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use < PRE > tags for code snippets, it preserves indentation, and improves readability.

Re: Initialize array in one line / in a single statement

Luc Pattyn22-Jun-10 3:44

Luc Pattyn

22-Jun-10 3:44

string[] sa=new string('*', (int)Math.Round((Math.Pow(0.5+Math.Sqrt(1.25), n)-Math.Pow(0.5-Math.Sqrt(1.25), n))/Math.Sqrt(5))).Replace("*", ".*").Substring(1).Split('.');

works quite well.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use < PRE > tags for code snippets, it preserves indentation, and improves readability.

Re: Initialize array in one line / in a single statement

Andrew Rissing22-Jun-10 6:55

Andrew Rissing

22-Jun-10 6:55

You know, your teacher is likely just wanting a recursive method[^].

Re: Initialize array in one line / in a single statement

Luc Pattyn22-Jun-10 7:09

Luc Pattyn

22-Jun-10 7:09

I suggest you try Fibonacci(100) in a recursive way; you can walk around the world while it computes.
Unless you go for a more advanced equation, one that calculates Fib(2x) from Fib(x).

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use < PRE > tags for code snippets, it preserves indentation, and improves readability.

Re: Initialize array in one line / in a single statement

Andrew Rissing22-Jun-10 7:54

Andrew Rissing

22-Jun-10 7:54

Oh, I'm not suggesting that it is a better solution what so ever. I'm just stating it sounds like a homework assignment for creating a recursive Fibonacci implementation. Poke tongue | ;-P

Re: Initialize array in one line / in a single statement

NetQuestions26-Jun-10 22:39

NetQuestions

26-Jun-10 22:39

Hi,

recursion is not always the way.

*
*
*
**
***
*****
********

If I were to generate and display the following, you will observe that when n= 50, program
hangs. the number of times recursive method gets called grows exponentially.

In such a case a non recursive method is required.

Regards,
NetQuestions

Re: Initialize array in one line / in a single statement

Andrew Rissing27-Jun-10 3:37

Andrew Rissing

27-Jun-10 3:37

Indeed, I'm well aware of such. I was only basing my suggestion on the fact it seemed like a homework assignment to create a recursive method. Smile | :)

Re: Initialize array in one line / in a single statement

Ennis Ray Lynch, Jr.22-Jun-10 7:57

Ennis Ray Lynch, Jr.

22-Jun-10 7:57

I am not an algorithms expert so mine may be wrong and I did cheat for base case but my recursive Fib algorithm is instant. I won't post because it may be the OP's homework but Fib is not hard and does not require any deep recursion. My algorithm needs 98 levels to calculate the Fib numbers from 2 to 100. (Again, I cheated on the base)

Re: Initialize array in one line / in a single statement

Luc Pattyn22-Jun-10 8:03

Luc Pattyn

22-Jun-10 8:03

yes, you can easily avoid the exponential behavior, however I have seen quite a few straightforward recursive implementations that don't. They are extremely good examples against the use of recursion for anything that is not recursive by its very nature (such as a hierarchical file system).

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use < PRE > tags for code snippets, it preserves indentation, and improves readability.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.