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• Understanding character encoding in typical Java web app

  - by Marcus

  Some pseudocode from a typical web app: String a = "A bunch of text"; //UTF-16 saveTextInDb(a); //Write to Oracle VARCHAR(15) column String b = readTextFromDb(); //UTF-16 out.write(b); //Write to http response In the first line we create a Java String which uses UTF-16. When you save to Oracle VARCHAR(15) does Oracle also store this as UTF-16? Does the length of an Oracle VARCHAR refer to number of Unicode characters (and not number of bytes)? And then when we write b to the ServletResponse is this being written as UTF-16 or are we by default converting to another encoding like UTF-8?

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• Align text with right edge of an html form

  - by williamjones

  I have an html form where the width of a textarea is specified with cols=. I want the textarea to have a specific width in terms of number of characters. However, I also want some controls to be right-justified to the right edge of the textarea. They're not in the textarea, but directly above or below it. Is it possible to do this? I was thinking a possible approach might be enclosing the textarea with some type of container that could grow to the width of the textarea, but I'm not sure how I could right-justify text within that.

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• Java serial comm notifyOnDataAvailable configure receive buffer size?

  - by fred basset

  Hi All, I have a Java serial driver that's using the notifyOnDataAvailable mode to enable async. receive notification. I see an occasional problem where the SerialPortEvent.DATA_AVAILABLE serial event is not called until a relatively large no. of characters have been received (e.g. 34). The problem is that the sender sent a 20 byte packet, so the Java receiver did not send an ACK until the sender did a retry of the 20 byte send. Is there any way in Java COMM to configure the size of the receive buffer?

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• Very difficult SQL query

  - by db666

  For the following table definitions: Name Null? Type Comments ------------------------------- -------- ---- ------------------------------------ ENUM NOT NULL NUMBER(4) ENUM should not exceed a length of 4. ENAME CHAR(15) ADDRESS CHAR(25) ADDRESS should not exceed 25 characters. SALARY NUMBER(5) OFFICE CHAR(4) DNUM NOT NULL NUMBER(4) Department which this employee belongs to department Name Null? Type Comments ------------------------------- -------- ---- ------------------------------------- DNUM NOT NULL NUMBER(4) DMGR NOT NULL NUMBER(4) Department manager DNAME NOT NULL CHAR(15) project Name Null? Type Comments ------------------------------- -------- ---- ------------------------------------- PNUM NOT NULL NUMBER(4) PMGR NOT NULL NUMBER(4) Project manager PTITLE NOT NULL CHAR(15) emp_proj Name Null? Type ------------------------------- -------- ---- PNUM NOT NULL NUMBER(4) ENUM NOT NULL NUMBER(4) I have to write SQL query which will find the names of employees who do not share an office but work on the same project, and have different salaries... I've spent last three days trying to figure out something, but no idea as far. I will appreciate any advice.

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• Programming Quiz [closed]

  - by arin-s-rizk

  Hi one of my mates sent me this quiz see if you can guess the answers I will post mine later. In this quiz, some tasks related to the compilation process are listed. For each one of them, specify the part of the compiler that is responsible of performing it. Here are the possible answers: Lexical analyzer Parser Semantic analyzer None of the above Just fill the right choice (the number only) in the blank after each task: Checking that the parentheses in an expression are balanced _ _ _ _ _ Removing comments from the program _ _ _ _ _ Grouping input characters into "tokens" _ _ _ _ _ Reporting an error to the programmer about a missing (;) at the end of a C++ statement _ _ _ _ _ Checking if the type of the RHS (Right-Hand Side) of an assignment (=) is compatible with the LHS (Left-Hand Side) variable _ _ _ _ _ Converting the (AST) Abstract Syntax Tree into machine language _ _ _ _ _ Reporting an error about a strange character like '^' in a C++ program _ _ _ _ _ Optimizing the AST _ _ _ _ _

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• STL deque accessing by index is O(1)?

  - by jasonline

  I've read that accessing elements by position index can be done in constant time in a STL deque. As far as I know, elements in a deque may be stored in several non-contiguous locations, eliminating safe access through pointer arithmetic. For example: abc-defghi-jkl-mnop The elements of the deque above consists of a single character. The set of characters in one group indicate it is allocated in contiguous memory (e.g. abc is in a single block of memory, defhi is located in another block of memory, etc.). Can anyone explain how accessing by position index can be done in constant time, especially if the element to be accessed is in the second block? Or does a deque have a pointer to the group of blocks? Update: Or is there any other common implementation for a deque?

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• Velocity templates seem to fail with UTF-8

  - by steve

  Hi, i have been trying to use a velocity Template with the following content: Sübjäct $item everything works fine except the translation of the tow unicode characters. The result string printed on the commandline looks like: Sübjäct foo I searched the velocity website and the web an this issue, and came uo with differnt font encoding options, which i added to my code. But those won't help. This is the actuall code: velocity.setProperty("file.resource.loader.path", absPath); velocity.setProperty("input.encoding", "UTF-8"); velocity.setProperty("output.encoding", "UTF-8"); Template t = velocity.getTemplate("subject.vm"); t.setEncoding("UTF-8"); StringWriter sw = new StringWriter(); t.merge(null, sw); System.out.println(sw.getBuffer()); Can anyone give me some hints, how to fix this issue?

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• infix formula in the input

  - by gcc

  input: sqrt(2 - sin(3*A/B)^2.5) + 0.5*(C*~(D) + 3.11 +B) a b /*there are values for a,b,c,d */ c d input : sqrt(2 - asin(3*A/B)^2.5) +cos(0.5*(C*~(D)) + 3.11 +B) a b /*there are values for a,b,c,d */ c d input: sqrt(2 - sin(3*A/B)^2.5)/(0.5*(C*~(D)) + sin(3.11) +ln(B)) /*max lenght of formula is 250 characters*/ a b /*there are values for a,b,c,d */ c /*each variable with set of floating numbers*/ d As you can see infix formula in the input depends on user. My program will take a formula and n-tuples value. Then it calculate the results for each value of a,b,c and d. If you wonder I am saying ;outcome of program is graph. I dont know way how to store the formula so that I can do my job with easy. can you show me? a,b,c,d is letters cos,sin,sqrt,ln is function

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• Copying a IO stream results in corruption.

  - by StackedCrooked

  I have a small Mongrel webserver that sends the stdout of a process to a http response: response.start(200) do |head,out| head["Content-Type"] = "text/html" status = POpen4::popen4(command) do |stdout, stderr, stdin, pid| stdin.close() FileUtils.copy_stream(stdout, out) FileUtils.copy_stream(stderr, out) puts "Sent response." end end This works well most of the time, but sometimes characters get duplicated. For example this is what I get from the "man ls" command: LS(1) User Commands LS(1) NNAAMMEE ls - list directory contents SSYYNNOOPPSSIISS llss [_O_P_T_I_O_N]... [_F_I_L_E]... DDEESSCCRRIIPPTTIIOONN List information about the FILEs (the current directory by default). Sort entries alphabetically if none of --ccffttuuvvSSUUXX nor ----ssoorrtt. Mandatory arguments to long options are mandatory for short options For some mysterious reason capital letters get duplicated. Can anyone explain what's going on?

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• Does having a longer string in a SQL Like expression allow hinder or help query executing speed?

  - by Allain Lalonde

  I have a db query that'll cause a full table scan using a like clause and came upon a question I was curious about... Which of the following should run faster in Mysql or would they both run at the same speed? Benchmarking might answer it in my case, but I'd like to know the why of the answer. The column being filtered contains a couple thousand characters if that's important. SELECT * FROM users WHERE data LIKE '%=12345%' or SELECT * FROM users WHERE data LIKE '%proileId=12345%' I can come up for reasons why each of these might out perform the other, but I'm curious to know the logic.

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• What is a good standard for code width?

  - by BillyONeal

  Hello everyone :) I've heard in several places that it's bad to have code that is too wide onscreen. For example: for (std::vector<EnumServiceInformation>::const_iterator currentService = services.begin(); currentService != services.end(); currentService++) However, I've heard many arguments for 80 character wide limits. I'm assuming this 80 character limit comes from the traditional command prompt, which is typically 80 characters wide. However -- most of us are working on something much better than a typical command prompt, and I feel that using an 80 character limit encourages use of variable names that are far too short and do not describe what the variable is used for. What is a reasonable limit for a new project with no existing coding width standard?

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• starting a service based on someone's GPL/MIT licensed code

  - by fooyee

  someone wrote a nice framework for developing html5 3d engine. It's GPL/MIT licensed. Do you think it's a good idea to build upon it, and then repackage it and sell it as a service? For eg the framework lets you build 3d environments. so I build on it, maybe add a few features like characters and music in the environment, and turn it into an online game. Is it a feasible idea? Of course, part of the GPL license says that all source code has to be visible to end users. Assuming the web is a winner take all market based on first mover advantage, why care about hiding the source code? It's the product that's being sold that counts.

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• Why doesn't jquery validation plugin's remote attribute work for me?

  - by Pandiya Chendur

  I use jquery validation plugin and the remote attribute works with emailId but not with mobileNo? var validator = $("#addform").validate({ rules: { Name: "required", MobileNo: { required: true, minlength: 10, remote: '<%=Url.Action("getClientMobNo", "Clients") %>' }, Address: "required" }, messages: { Name: "please provide a client name", MobileNo: { required: "Please provide a mobile phone no", rangelength: jQuery.format("Enter at least {0} characters"), remote: jQuery.format("This MobileNo is already in use") }, Address: "please provide client address" }, A null value is passed to my controller action.. Any suggestion... public JsonResult getClientMobNo(string mobno) { JsonResult result = new JsonResult(); string status = clirep.getClientMobNo(Convert.ToInt64(mobno)); if (status == "Mobile No already exists") { result.Data = false; } else { result.Data = true; } return result; }

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• how to convert webpage apostrophe (&#8217;) to ascii 39 in ruby 1.8.7

  - by maninwarren

  That's pretty much it. I'm using Nokogiri to scrape a web page what has ’ ; characters in it, and I can't figure out how to do the conversion. here's what I tried: str.gsub(/&#8217;/,"'") str.gsub("&#8217;","'") str.gsub("GÇÖ","'") # that's how it looks when I do a puts (In the above, there's no space between the ’ and the ";", but if I don't put the space in, SO converts it to an apostrophe -- the cruel, cruel irony!) I'm sure this is covered somewhere, but couldn't find the solution here or on the web. TIA

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• Qt/C++ regular expression library with unicode property support

  - by Dave

  I'm converting an application from the .Net framework to Qt using C++. The application makes extensive use of regular expression unicode properties, i.e. \p{L}, \p{M}, etc. I've just discovered that the QRegExp class lacks support for this among other things (lookbehinds, etc.) Can anyone recommend a C++ regular expression library that: Supports unicode properties Is unicode-aware in other respects (i.e. \w matches more than ASCII word characters) As a bonus, supports lookbehinds. Please don't point me to the wikipedia article; I don't trust it. That article says that QRegExp supports unicode properties. Unless I'm really doing something wrong, it doesn't. I'm looking for someone actually using unicode properties with a regex library in a project.

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• PHP - Using strcpsn() to protect against SQL injection?

  - by MichaelMitchell

  I am making a sort of form validation system and I need to check the SQL database to see if the username is already there. So, my question, is it effective to use a little if statement like this to protect against an attack? if (strcspn($string, "/\?!@#$%^&*()[]{}|:;<>,.\"\'-+=" == strlen($string)){ return true; } So essentially, if the string contains any of these characters, "/\?!@#$%^&*()[]{}|:;<>,.\"\'-+=", then the length will not equal that of the original $string. I am just wondering if this is sufficient to protect, or if there is more that I must do. Thanks.

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• Regular Expression for accurate word-count using JavaScript

  - by Haidon

  I'm trying to put together a regular expression for a JavaScript command that accurately counts the number of words in a textarea. One solution I had found is as follows: document.querySelector("#wordcount").innerHTML = document.querySelector("#editor").value.split(/\b\w+\b/).length -1; But this doesn't count any non-Latin characters (eg: Cyrillic, Hangul, etc); it skips over them completely. Another one I put together: document.querySelector("#wordcount").innerHTML = document.querySelector("#editor").value.split(/\s+/g).length -1; But this doesn't count accurately unless the document ends in a space character. If a space character is appended to the value being counted it counts 1 word even with an empty document. Furthermore, if the document begins with a space character an extraneous word is counted. Is there a regular expression I can put into this command that counts the words accurately, regardless of input method?

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• Fixing too long comment lines in Vim

  - by Tomek Kaftal

  I'm looking for a convenient way to fix comments where line lengths exceed a certain number of characters in Vim. I'm fine with doing this manually with code, especially since it's not that frequent, plus refactoring long lines is often language, or even code-style dependent, but with comments this is pure drudgery. What happens is I often spot some issue in a comment, tweak one or two words and the line spills out of the, say, 80 character limit. I move the last word to the next line and then the next line spills, and so on. Does anyone know a way to do this automatically in Vim?

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• preg_match and long strings

  - by aleluja

  Hi, This is the preg_match i am trying to use to find specific text in text file. if (preg_match($regexp,$textFile,$result) > 0) { echo "Found ".$result[0]; } else { echo "Not found"; } However, the result is always Found and nothing more. The result array is empty. Now i read that preg_match can't work with long strings. My text file is about 300KB so thats 300000 characters i guess. I am 100% sure that the searched string is in the text file, and the fact that preg_match function returns value above 0 means it found it, but it didn't place it into the result array somehow. So my question would be, how do i make it work? regexp would be /[specific text]\{(\d*)\}/ so, of course i want to be able to get the number in the parentheses.

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• Python - Removing duplicates from a string

  - by Daniel

  def remove_duplicates(strng): """ Returns a string which is the same as the argument except only the first occurrence of each letter is present. Upper and lower case letters are treated as different. Only duplicate letters are removed, other characters such as spaces or numbers are not changed. >>> remove_duplicates('apple') 'aple' >>> remove_duplicates('Mississippi') 'Misp' >>> remove_duplicates('The quick brown fox jumps over the lazy dog') 'The quick brown fx jmps v t lazy dg' >>> remove_duplicates('121 balloons 2 u') '121 balons 2 u' """ s = strng.split() return strng.replace(s[0],"") Writing a function to get rid of duplicate letters but so far have been playing around for an hour and can't get anything. Help would be appreciated, thanks.

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• another file_exists with special chars problem

  - by Camran

  I have some folders with special characters in their names. I run currently at a test-computer with Windows OS, but later I will use LINUX. My problem is that the folders with special chars in their names cannot be recognized somehow. ex: file_exists('../Bilar/27733691_1.jpg') // TRUE file_exists('../Båtar/27733691_1.jpg') // FALSE because of the special char in folder name... How should I solve this? I plan to run LINUX in the future when website is online... would that matter? Please explain thoroughly because I am a newb at this Thanks

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• How to hide/show more text within a certain length (like youtube)

  - by Ben

  So lets say i have want to have a text to only be a certain amount of characters/length and after that length i want to put an link to reveal the full length of the text. The link will be (more...). And once the user clicks the link (more..) the rest of the text will slide down. How would i accomplish this. Heres an example. blah blah blah blah blah (more...) when user clicks (more..) , it will show the entire text will show Also i am taking a about data in a table row/table cell, not just any text

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• convert int into string with certain length of char

  - by Tommy

  If the title wasn't clear, ill try to explain it well here. I have a bunch of integers, ranging from 1 to 999, and i need to convert these into strings, but when i do that, i need them to be 3 characters long. so for instance, if i had: int i1 = 45; then when i turned that into a string, i'd need this: "045" or similarly, if i had an int of 8 then that would have to turn into "008", and if anything had 3 places, such as 143, then it would just be outputted as 143. is this easily possible? Thanks for responses in advance. :)

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• Vim: replacing start and end of a visual char, line or block

  - by gattu marrudu

  I am trying to find a shortcut to place a custom comment sequence on my code, e.g.: /* start of comment blah end of comment /**/ (it is easier to void the comment by just adding a / to the beginning) I would like to do this in Vim by selecting a visual line, block or char and adding '/' characters at the beginning of the block and '/*/' at the end, plus newlines. After selecting some lines (Shift-V) I tried this: '<,'>s/\(.*\)/\/*\r\1\r\/**\// But it adds the comment chars at EACH newline. How can I only apply the substitution at the beginning and end of the selected range? Thanks gm

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• Using Python, How to copy files in 'temporary internet files' folder in Windows

  - by pythBegin

  I am using this code to find files recursively in a folder , with size greater than 50000 bytes. def listall(parent): lis=[] for root, dirs, files in os.walk(parent): for name in files: if os.path.getsize(os.path.join(root,name))>500000: lis.append(os.path.join(root,name)) return lis This is working fine. But when I used this on 'temporary internet files' folder in windows, am getting this error. Traceback (most recent call last): File "<pyshell#4>", line 1, in <module> listall(a) File "<pyshell#2>", line 5, in listall if os.path.getsize(os.path.join(root,name))>500000: File "C:\Python26\lib\genericpath.py", line 49, in getsize return os.stat(filename).st_size WindowsError: [Error 123] The filename, directory name, or volume label syntax is incorrect: 'C:\\Documents and Settings\\khedarnatha\\Local Settings\\Temporary Internet Files\\Content.IE5\\EDS8C2V7\\??????+1[1].jpg' I think this is because windows gives names with special characters in this specific folder... Please help to sort out this issue.

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