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  • how to accept valid e-mail id in text box?

    - by giri
    Hi I have designed a chat application using servlets and jsp. I have designed a page for user login, where I accept used id and his mail-id.How can i ensure that user has typed proper mail-id. I need a code to validate email-id.I mean for example user can not type anything in the text box.

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  • How can I turn a string of text into a BigInteger representation for use in an El Gamal cryptosystem

    - by angstrom91
    I'm playing with the El Gamal cryptosystem, and my goal is to be able to encipher and decipher long sequences of text. I have come up with a method that works for short sequences, but does not work for long sequences, and I cannot figure out why. El Gamal requires the plaintext to be an integer. I have turned my string into a byte[] using the .getBytes() method for Strings, and then created a BigInteger out of the byte[]. After encryption/decryption, I turn the BigInteger into a byte[] using the .toByteArray() method for BigIntegers, and then create a new String object from the byte[]. This works perfectly when i call ElGamalEncipher with strings up to 129 characters. With 130 or more characters, the output produced is garbled. Can someone suggest how to solve this issue? Is this an issue with my method of turning the string into a BigInteger? If so, is there a better way to turn my string of text into a BigInteger and back? Below is my encipher/decipher code. public static BigInteger[] ElGamalEncipher(String plaintext, BigInteger p, BigInteger g, BigInteger r) { // returns a BigInteger[] cipherText // cipherText[0] is c // cipherText[1] is d BigInteger[] cipherText = new BigInteger[2]; BigInteger pText = new BigInteger(plaintext.getBytes()); // 1: select a random integer k such that 1 <= k <= p-2 BigInteger k = new BigInteger(p.bitLength() - 2, sr); // 2: Compute c = g^k(mod p) BigInteger c = g.modPow(k, p); // 3: Compute d= P*r^k = P(g^a)^k(mod p) BigInteger d = pText.multiply(r.modPow(k, p)).mod(p); // C =(c,d) is the ciphertext cipherText[0] = c; cipherText[1] = d; return cipherText; } public static String ElGamalDecipher(BigInteger c, BigInteger d, BigInteger a, BigInteger p) { //returns the plaintext enciphered as (c,d) // 1: use the private key a to compute the least non-negative residue // of an inverse of (c^a)' (mod p) BigInteger z = c.modPow(a, p).modInverse(p); BigInteger P = z.multiply(d).mod(p); byte[] plainTextArray = P.toByteArray(); String output = null; try { output = new String(plainTextArray, "UTF8"); } catch (Exception e) { } return output; }

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  • How to use Regex Replace to conditionally remove blocks of text?

    - by lauren meyers
    I would like to conditionally remove a block of text between specifed start and stop delimiters. The code below does not work, but hopefully it suggests enough of what I am trying to accomplish. If dr("ReferralPoints") > 0 Then Dim objRegex As Regex = New Regex("[HASNOVALUE:REFERRALPOINTS](.*)[/HASNOVALUE:REFERRALPOINTS]", RegexOptions.IgnoreCase + RegexOptions.Singleline) Dim result As String = objRegex.Replace(strBody, "") End If

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  • How to write the content of a dictionary to a text file?

    - by codemonkie
    I have a dictionary object of type Dictionary and trying to use StreamWriter to output the entire content to a text file but failed to find the correct method from the Dictionary class. using (StreamWriter sw = new StreamWriter("myfile.txt")) { sw.WriteLine(dictionary.First()); } I can only retrieve the first element and it is bounded by a square bracket plus a comma separator in between as well: [Peter, Admin] and would be nice to have [Peter Admin] (without the comma)

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  • How can I get text under mouse pointer WebBrowser control?

    - by Alexander
    I'm currently working on WYSIWYG editor using .net WebBrowser control and I need to implement spell checking. My question is how can I get text under mouse pointer when I right click on the misspelled word to show all spell suggestions? Tried to wrap every misspelled word in html label with javascript event, but there seems to be the problem in invoking C# code from javascript.

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  • How can I count paragraphs in text file using Perl?

    - by robjez
    I need to create Perl code which allows counting paragraphs in text files. I tried this and doesn't work: open(READFILE, "<$filename") or die "could not open file \"$filename\":$!"; $paragraphs = 0; my($c); while($c = getc(READFILE)) { if($C ne"\n") { $paragraphs++; } } close(READFILE); print("Paragraphs: $paragraphs\n");

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  • How can I select multiple text segments in a WPF textbox?

    - by luvieere
    Is it possible to select multiple parts of text within a WPF textbox? For instance, for a textbox that contains the string THIS IS A TEST, I want to be able to highlight THIS, then hold Ctrl and highlight TEST without unselecting THIS. For a visual clue about what I'm aiming at, see this article about the feature in Firefox.

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  • Problem with insert Thai Language data to SQL Server 2008 field datatype text and show ????

    - by embarus
    Hello everyone I created MVC ASP.Net Web application and tried insert Thai language data to SQL Server 2008 database to field with data type text and then database store ?????? which is incorrect. For Html Page I user charset utf-8 However I tried to Encode string before insert data to database and change database field collation. These do not solve problem. I'm looking forward to your reply. Thanks, embarus

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  • How can I get the plain-text content of a Google Doc via Google Doc API in Silverlight?

    - by Edward Tanguay
    I would like to use the Google Doc API to retrieve the plain-text content of a Google Doc document (not a spreadsheet) via the Google Docs API. In the documentation I can find information about accessing Spreadsheets and how to "create/upload/copy" documents: http://code.google.com/apis/documents/overview.html Does anyone have a C# code example to do this in Silverlight, something like this: //PSEUDOCODE: WebClientGoogleDoc proxy = new WebClientGoogleDoc (); proxy.DownloadStringCompleted += new DownloadStringCompletedEventHandler(proxy_DownloadStringCompleted); proxy.DownloadProgressChanged += new DownloadProgressChangedEventHandler(proxy_DownloadProgressChanged); proxy.DownloadStringAsyncWithGoogleDocId("dc7gj86r_20dn2csqg3");

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