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• Write failed, errno 0

  - by EpsilonVector

  I have a client server situation in which I receive data using read(socket, char_buf, BUF_SIZE) and then try to write it into a log file using write(filefd, char_buf, strlen(char_buf)) Strangely enough this fails (write returns -1), and yet the errno is set to 0, and I can print the message, AND the log file descriptor works (I write to it before and after this command). What's going on?? (Working on Linux kernel 2.4 (homework))

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• check if current emacs buffer contains a string

  - by John

  I have a buffer open in emacs. I want a function that will return t if the current buffer contains the string, otherwise it returns nil. (defun buffer-contains-substring (string) ... )

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• MySQL - Limit a left join to the first date-time that occurs?

  - by John M

  Simplified table structure (the tables can't be merged at this time): TableA: dts_received (datetime) dts_completed (datetime) task_a (varchar) TableB: dts_started (datetime) task_b (varchar) What I would like to do is determine how long a task took to complete. The join parameter would be something like ON task_a = task_b AND dts_completed < dts_started The issue is that there may be multiple date-times that occur after the dts_completed. How do I create a join that only returns the first tableB-datetime that occurs after the tableA-datetime?

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• C#: Do I need to lock a static class when accessing from separate threads?

  - by JimDaniel

  I have a static class with a few methods that just take in a byte array, parses it, and returns a structure. I need to call these methods from many separate threads. Do I need a lock() or some kind of thread-safety within the methods? I can't get my head around it.

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• What's wrong with my using pdo this way?

  - by user198729

  $sql = "SELECT * FROM table ORDER BY :sort :dir LIMIT :start, :results"; $stmt = $dbh->prepare($sql); $stmt->execute(array( 'sort' => $_GET['sort'], 'dir' => $_GET['dir'], 'start' => $_GET['start'], 'results' => $_GET['results'], ) ); I tried to use prepare to do the job,but $stmt->fetchAll(PDO::FETCH_ASSOC); returns nothing.

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• Operation precedence on postgress

  - by user24691

  I have set new division on postgress pg_operator table because i want tath when is division by zero return 0. i have write this: create operator / ( procedure = zero_division, leftarg = double precision, rightarg = double precision); where zero_division is: CREATE OR REPLACE FUNCTION zero_division(double precision, double precision) RETURNS double precision AS 'select case when $2 = 0 then 0 else $1 / $2::real end;' LANGUAGE sql IMMUTABLE COST 100; when i run value/ 0 i get error of division.

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• How to implement unix ls -s command in C?

  - by Annonymous

  I have to write a program in C which returns file size in blocks just like ls -s command. Please help.

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• java oracle cusor is closed where cursor is not return to jdbc

  - by optimus

  I am executing a stored procedure which has 2 cusors within the stored procedure. The 1st cursor which is not return to the jdbc as a resultset is closed within the stored procedure. The 2nd cursor which returns the resultset to the jdbc is not closed within the stored procedure. Upon executing I encounter cursor is closed exception which is puzzling. Since the ResultSet will close all underlying cursor upon invoking the close() method

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• Do I need to cast the result of strtol to int?

  - by Kristo

  The following code does not give a warning with g++ 4.1.1 and -Wall. int octalStrToInt(const std::string& s) { return strtol(s.c_str(), 0, 8); } I was expecting a warning because strtol returns a long int but my function is only returning a plain int. Might other compilers emit a warning here? Should I cast the return value to int in this case as a good practice?

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• Simple check for SELECT query empty result

  - by den-javamaniac

  Hi. Can anyone point out how to check if a select query returns non empty result set? For example I have next query: SELECT * FROM service s WHERE s.service_id = ?; Should I do something like next: ISNULL(SELECT * FROM service s WHERE s.service_id = ?) to test if result set is not empty?

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• how to obtain fillColor from mx:LegendItem

  - by Mohit Ranka

  I need to get the fillcolor from a legendItem, howerver doing lItem.getStyle("fill") returns a different color than the actual legendItem marker color. Any pointers on what am I doing wrong here?

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• binary operator "<"

  - by md004

  Consider this expression as a "selection" control structure on integer "x": 0 < x < 10, with the intention that the structure returns TRUE if "x" is in the range 1..9. Explain why a compiler should not accept this expression. (In particular, what are the issues regarding the binary operator "<"? Explain how a prefix operator could be introduced so the expression can be successfully processed.

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• What is your favourite online JavaScript reference manual? [closed]

  - by daniel.sedlacek

  I'm an object oriented programmer and am looking for a good JavaScript online reference manual. The ideal reference manual should contain: compendious, I'm not looking for ECMA standard reference. type specific, even if JavaScript is not strongly typed, function arguments and returns have a type. browser specific, no matter the standards every browser is different. contain examples be available online. What is your favorite online JavaScript reference manual?

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• Extract Address Information from a Web Page

  - by Brian Boatright

  I need to take a web page and extract the address information from the page. Some are easier than others. I'm looking for a firefox plugin, windows app, or VB.NET code that will help me get this done. Ideally I would like to have a web page on our admin (ASP.NET/VB.NET) where you enter a URL and it scraps the page and returns a Dataset that I can put in a Grid.

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• How to check if a string has earlier been set using iabbr (full match)

  - by Sumit

  I am trying to check if a lhs is already abbreviated in vim. mapcheck, however, seems to have a problem. For example, iabbr swt switch echo mapcheck('sw','i',1) returns "switch" even when "switch" defined for "swt". mapargs seem to return a string even if there is a partial match with the lhs. Is there a way to find if an abbreviation has been defined for the "exact" match, i.e., the above mapcheck returning a "" instead.

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• How to realize this in Transact SQL ( SQL Server 2008 )

  - by David

  I just want an update trigger like this postgresql version... It seems to me there is no NEW. and OLD. in MSSQL? CREATE OR REPLACE FUNCTION "public"."ts_create" () RETURNS trigger AS DECLARE BEGIN NEW.ctime := now(); RETURN NEW; END; Googled already, but nothing to be found unfortunately... Ideas?

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• Access cookies from Google Chrome extension

  - by Buddy

  Is there any way to access cookies from Chrome extension? this code document.cookie.length always returns - 0.

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• find out if there are hidden columns in excel

  - by ps

  Hi all, I need to know if there hidden columns in the excel sheet. i used use the following which worked fine and then suddenly it stopped working.now it always returns false. bool.Parse(worksheet.PageSetup.Application.Columns.Hidden.ToString()) TIA excel 2007 .net 3.5

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• Converting Numpy Lstsq residual value to R^2

  - by whatnick

  I am performing a least squares regression as below (univariate). I would like to express the significance of the result in terms of R^2. Numpy returns a value of unscaled residual, what would be a sensible way of normalizing this. field_clean,back_clean = rid_zeros(backscatter,field_data) num_vals = len(field_clean) x = field_clean[:,row:row+1] y = 10*log10(back_clean) A = hstack([x, ones((num_vals,1))]) soln = lstsq(A, y ) m, c = soln [0] residues = soln [1] print residues

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• JavaScript function to validate an integer value

  - by Psyche

  Hello, I'm building a shopping cart and I would like to use a JavaScript function to validate user input when entering the quantity value in the quantity text input. I would like to allow the entering of integer values only (no floats, no other characters). I know that I can apply this function using onKeyUp event and also I found isNaN() function, but it returns true even for floats (which is not ok). Can you guys help me out with this one? Thanks.

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• Does F# have an equivalent to Haskell's take?

  - by McMuttons

  In Haskell, there is a function "take n list" which returns the first n elements from a list. For example "sum (take 3 xs)" sums up the first three elements in the list xs. Does F# have an equivalent? I expected it to be one of the List-functions, but I can't spot anything that seems to match.

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• Regular expression for a list of numbers without other characters

  - by JamesW

  I need a regular expression for a list of numbers in a text box with carriage returns and line feeds, but no other characters. e.g. 1234 5678 5874 3478 I have this: Regex(@"\d\r\n${0,}?"); ... but it is accepting commas when I paste them into my text box: e.g. 1234, 5678 5874, 3478 Can someone please tell me what I'm doing wrong? Thanks

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• T-SQL 2005 - Divide by zero error encountered

  - by Grant

  Hi, I am trying to get some percentage data from a stored procedure using code similar to the line below. Obviously this is going to cause a (Divide by zero error encountered) problem when base.[XXX_DataSetB] returns 0 which may happen some of the time. Does anyone know how i can deal with this in the most efficient manner? Note: There would be about 20+ lines looking like the one below... cast((base.[XXX_DataSetB] - base.[XXX_DataSetA]) as decimal) / base.[XXX_DataSetB] as [XXX_Percentage]

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• Find Nth occurance of a character in a string

  - by jozi

  I need help with creating a C# method that returns the index of the Nth occurance of a character in a string. For instance, the 3rd occurance of the character 't' in the string "dtststx" is 5.

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• jQuery: Get <td>'s html only

  - by Poku

  Hey, i have this code. It returns all the td code including the td /td tags. I want it to only return the content/html of the td <td>Hey</td> should give me just Hey   jQuery("#ReportTable", html).each(function (index, tr) { arr[index] = jQuery("tbody tr", tr).map(function (index, td) { return jQuery(td).html(); }); });

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