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• PHP and Apache environment variables

  - by Simon

  Hello, I want to pass an environment variable in linux to apache on start up. export MYVAR=5 --I define my environment variable on the command line PassEnv MYVAR --set apache to import the variable in apache config file apachectl restart --when I restart apache I don't get an error message. However I have noticed that if I do not create the environment variable in my first step, I get a warning message, so must be working here echo $_SERVER['MYVAR'] --i try to access the environment variable within PHP but it is not defined I've observed that if I try to PassEnv an environment variable that already exits (one that I havn't created myself) it works fine. The SetEnv directive also works fine. I'd really like to pass an environment variable to apache on the fly without writing it in a file. Help much appreciated. I'm using CentOS, PHP5 and Apache2. Thanks.

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• How to initialize F# list when size is unknown, using while..do loop

  - by James Black

  I have a function that will parse the results of a DataReader, and I don't know how many items are returned, so I want to use a while..do loop to iterate over the reader, and the outcome should be a list of a certain type. (fun(reader) -> [ while reader.Read() do new CityType(Id=(reader.GetInt32 0), Name=(reader.GetString 1), StateName=(reader.GetString 2)) ]) This is what I tried, but the warning I get is: This expression should have type 'unit', but has type 'CityType'. Use 'ignore' to discard the result of the expression, or 'let' to bind the result to a name. So what is the best way to iterate over a DataReader and create a list?

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• How do I make a hyperlink to a local executable?

  - by Scott Ferguson

  We have an Intranet website, and a WPF windows executable installed on every workstation. How can we create a hyperlink on the intranet website that will launch the locally installed executable? Ideally we want the launch to be seamless. Is there a way of setting the browsers trust settings so that it won't display a security warning dialog for this executable? We have full admin capabilities on each workstation, and each user only uses Internet Explorer. We also know the correct local path for the exe.

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• Posting to tumblr in PHP

  - by Sherif

  I am trying to make a test post to my tumblr blog with a php script (that will eventually be ran as a cron job) I have been browsing google and read many answers on here and the closest I found is explained in this post: Tumblr OAuth using PHP's OAuth class I am using the code in his tutorial here: http://vigrond.com/blog/2012/02/04/oauth-extension-php-and-the-tumblr-api/ Pretty much as is, replacing the blogurl with mine and of course the consumer and secret key. When I run the .php script via my browser however, nothing happens. Any ideas? EDIT: The only error I found in cPanel's error log is this: [Wed Oct 31 00:29:25 2012] [error] [client xx.xx.xx.xx ] PHP Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /path on line 14 But I fixed this and the error does not appear anymore.

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• Why is capistrano acting up like this?

  - by Matt

  I am having an issue with my deploy i ran cap deploy and got this Warning: Permanently added 'github.com,207.97.227.239' (RSA) to the list of known hosts. ** [174.143.150.79 :: out] Permission denied (publickey). ** fatal: The remote end hung up unexpectedly command finished *** [deploy:update_code] rolling back * executing "rm -rf /home/deploy/transprint/releases/20110105034446; true" servers: ["174.143.150.79"] [174.143.150.79] executing command here is my deploy.rb set :application, "transprint" set :domain, "174.149.150.79" set :user, "deploy" set :use_sudo, false set :scm, :git set :deploy_via, :remote_cache set :app_path, "production" set :rails_env, 'production' set :repository, "[email protected]:myname/something.git" set :scm_username, 'deploy' set :deploy_to, "/home/deploy/#{application}" role :app, domain role :web, domain role :db, domain, :primary => true please help

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• How to detect unresolved symbol when creating a library ?

  - by Simon

  Hello everyone, Under Solaris 10, I'm creating a library A.so that calls a function f() which is defined in library B.so. To compile the library A.so, I declare in my code f() as extern. Unfortunately, I "forgot" to declare in A's makefile that it has to link with B. However, "make A" causes no warning, no error, and the library A.so is created. Of course, when executing A's code, the call of f() crashes because it is undefined. Is there a way (linker option, code trick...) to make the compilation of library A fail ? How can I be sure that all symbols refered to in library A are defined at compile time ? Thanks for any suggestions.

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• Changing ylim (axis limits) drops data falling outside range. How can this be prevented?

  - by Alex Holcombe

  df <- data.frame(age=c(10,10,20,20,25,25,25),veg=c(0,1,0,1,1,0,1)) g=ggplot(data=df,aes(x=age,y=veg)) g=g+stat_summary(fun.y=mean,geom="point") Points reflect mean of veg at each age, which is what I expected and want to preserve after changing axis limits with the command below. g=g+ylim(0.2,1) Changing axis limits with the above command unfortunately causes veg==0 subset to be dropped from the data, yielding "Warning message: Removed 4 rows containing missing values (stat_summary)" This is bad because now the data plot (stat_summary mean) omits the veg==0 points. How can this be prevented? I simply want to avoid showing the empty part of the plot- the ordinate from 0 to .2, but not drop the associated data from the stat_summary calculation.

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• Const parameter at constructor causes stackoverflow

  - by Luca

  I've found this strange behavior with VS2005 C++ compiler. Here is the situation: I cannot publish the code, but situation is very simple. Here is initial code: it work perfectly class Foo { public: Foo(Bar &bar) { ... } } The constructor implementation stores a reference, setup some members... indeed nothing special. If I change the code in the following way: class Foo { public: Foo(const Bar &bar) { ... } } I've added a const qualifier to the only constructor routine parameter. It compiles correctly, but the compiler outputs a warning saying that the routine Foo::Foo will cause a stackoverflow (even if the execution path doesn't construct any object Foo); effectively this happens. So, why the code without the const parameter works perfectly, while the one with the const qualifier causes a stackoverflow? What can cause this strange behavior?

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• Better way to write this Java code?

  - by Macha

  public void handleParsedCommand(String[] commandArr) { if(commandArr[0].equalsIgnoreCase("message")) { int target = Integer.parseInt(commandArr[1]); String message = commandArr[2]; MachatServer.sendMessage(target, this.conId, message); } else if(commandArr[0].equalsIgnoreCase("quit")) { // Tell the server to disconnect us. MachatServer.disconnect(conId); } else if(commandArr[0].equalsIgnoreCase("confirmconnect")) { // Blah blah and so on for another 10 types of command } else { try { out.write("Unknown: " + commandArr[0] + "\n"); } catch (IOException e) { System.out.println("Failed output warning of unknown command."); } } } I have this part of my server code for handling the types of messages. Each message contains the type in commandArr[0] and the parameters in the rest of commandArr[]. However, this current code, while working seems very unelegant. Is there a better way to handle it? (To the best of my knowledge, String values can't be used in switch statements, and even then, a switch statement would only be a small improvement.

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• Problem at JUnit test with generics

  - by Tom Brito

  In my utility method: public static <T> T getField(Object obj, Class c, String fieldName) { try { Field field = c.getDeclaredField(fieldName); field.setAccessible(true); return (T) field.get(obj); } catch (Exception e) { e.printStackTrace(); fail(); return null; } } The line return (T) field.get(obj); gives the warning "Type safety: Unchecked cast from Object to T"; but I cannot perform instanceof check against type parameter T, so what am I suppose to do here?

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• Why is 'volatile' parasitic in C++?

  - by Steve

  Consider the following code: int main() { int i; volatile int* p = &i; int *v = p; return 0; } This gives an error in g++: $ g++ -o volatile volatile.cpp volatile.cpp: In function ‘int main()’: volatile.cpp:6: error: invalid conversion from ‘volatile int*’ to ‘int*’ My intention was that I want to make p volatile. However, once I've read the value of p, I don't care if accessing v is volatile. Why is it required that v be declared volatile? This is hypothetical code of course. In a real situation you could imagine that p points to a memory location, but is modified externally and I want v to point to the location that p pointed to at the time of v = p, even if later p is externally modified. Therefore p is volatile, but v is not. By the way I am interested in the behaviour both when this is considered C and C++, but in C this only generates a warning, not an error.

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• php mail function cannot send to [email protected] ??i

  - by user333216

  I'm having trouble when sending emails thorough the mail() function. I have a script that works perfectly fine for an email address like [email protected] but when the first part of the email is something with a dot like [email protected] it doesn't work and returns this error : Warning: mail() [function.mail ]: SMTP server response: 554 : Recipient address rejected: Relay access denied in confirmed.php on line 119 I am using real email address but have changed it in the above example. Any thoughts - I'm not a php master but surely there is an easy way to send emails to address with a 2 part first section?? Thanks in advance Ali

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• Can't declare unused exception variable when using catch-all pattern

  - by b0x0rz

  what is a best practice in cases such as this one: try { // do something } catch (SpecificException ex) { Response.Redirect("~/InformUserAboutAn/InternalException/"); } the warning i get is that ex is never used. however all i need here is to inform the user, so i don't have a need for it. do i just do: try { // do something } catch { Response.Redirect("~/InformUserAboutAn/InternalException/"); } somehow i don't like that, seems strange!!? any tips? best practices? what would be the way to handle this. thnx

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• Displaying and capturing c# exceptions

  - by Frank Meulenaar

  I have a c# program which throws a NullReferenceException(). When I start this on my Vista machine, it gives the familiar screen "Foo has stopped working". I can easily click on 'details' to see what went wrong. On one XP machine there's no warning at all: the program just quits, and on another XP I get the "Foo has encountered a problem..." message. Is there a way I can change this (XP's) setting? Furthermore, I would like to have this error message written to a log file, so I can see what went wrong if somebody else uses my program. Is there a way I can send the uncaught exceptions to a file?

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• Seam-gen isn't working properly.. log4j acuses an error

  - by rgoytacaz

  Hello Seam Users, I'm having a couple problems with my Seam start up. I did the ./seam generate to reverse my current postgres db, which contains 4 tables, first I though everything was okay, just a warning message, but when I imported the project into eclipse, I saw that none of my packages had any class. This is the error that seam generate, got me. [hibernate] Executing Hibernate Tool with a JDBC Configuration (for reverse engineering) [hibernate] 1. task: hbm2java (Generates a set of .java files) [hibernate] log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment). [hibernate] log4j:WARN Please initialize the log4j system properly. [javaformatter] Java formatting of 0 files completed. Skipped 0 file(s). Any ideas? The seam-gen was supposed to generate some entity classes, but its not. I suppose that error is causing the mis-behavior. Regards

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• MySQL parameter resource error

  - by Derek

  Here is my error: Warning: mysql_query() expects parameter 2 to be resource, null given... This refers to line 23 of my code which is: $result = mysql_query($sql, $connection) My entire query code looks like this: $query = "SELECT * from users WHERE userid='".intval( $_SESSION['SESS_USERID'] )."'"; $result = mysql_query($query, $connection) or die ("Couldn't perform query $query <br />".mysql_error()); $row = mysql_fetch_array($result); I don't have a clue what has happpened here. All I wanted to do was to have the value of the users 'fullname' displayed in the header section of my web page. So I am outputting this code immediately after to try and achieve this: echo 'Hello '; echo $row['fullname']; Before this change, I had it working perfectly, where the session variable of fullname was echoed $_SESSION['SESS_NAME']. However, because my user can update their information (including their name), I wanted the name displayed in the header to be updated accordingly, and not displaying the session value.

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• Visual studio deployment project error when writing to registry

  - by Rekreativc

  Hello I have a setup for an application that was recently converted to be a framework 4.0 project (don't know if it's relevant). The setup has to write to registry (Local Machine) and until now this has always worked perfectly, however now it fails to write to registry on a clean machine (running Windows 7, 64 bit). The setup does not fail, does not show a warning of any kind, however it does not write to the registry (I even set AlwaysCreate property to true on every key, just in case) which of course causes the application to terminate on startup. What could be the cause of this? I have never encountered such an error before. Edit: I have tried running the installer as administrator, didn't change anything.

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• UX Design Question: Should a multi step wizard save the form contents when the user clicks 'go back'

  - by Ashwin Prabhu

  I am developing a web application that collects data over multiple steps through a wizard. Steps are generally not interdependent, in that data input at each step has little or no effect on the consequent steps. However each step may have a set of validations which determine whether the user can progress to the next step by clicking 'continue' What should be the behavior when the user clicks previous? a Quickly move to the previous page, thus losing all the unsaved data in the form. Prompting the user with a warning is an option, but it can become irritating quite soon. b Move to the previous page saving all the data in the current step - without triggering validations, so that when the user comes back she sees the form in the same state that she left it in. c any other behaviour All opinions are welcome :)

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• Loading UINavigationController from another nib automatically by UITabBarController

  - by porneL

  I think I've found the cause: Document Info window in IB has a warning: "'Selected Navigation Controller (Second)' has nib name property set to 'SecondView.nib', but this view controller is not intended to have its view set in this manner." Bummer. I've built nib in Interface Builder that has UITabBarController at top level and switches between UINavigationControllers. It works fine when everything is in a single nib file, but I'd like to use separate nib files for UINavigationControllers. Starting with Apple's TabBar template, if I just change class of SecondView to UINavigationController, it all breaks: and all I get is this: Is it possible to have separate file for UINavigationController without programmatically setting everything? I would like TabBarController to handle loading and unloading of nibs.

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• Strange findFn malfunction

  - by gd047

  I noticed a strange malfunction in using findFn function (library sos) and I can't find out the source. While it works fine on my Windows XP pc, it does not on my Vista one. library (sos) findFn("randomization test") # in both finds 72 results findFn("{randomization test}") # In XP finds 19 or about so, but in Vista whenever I use {} and more than one word inside, # I keep getting the following: found 0 matches x has zero rows; nothing to display. Warning message: In findFn("{randomization test}") : HIT not found in HTML; processing one page only. R ver = 2.10.1 and packages updated. Any ideas where the problem might be? Bonus: As it's obvious, I was looking for functions about tests for randomized experiments

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• C++ class initialisation containing class variable initialization

  - by Phil Hannent

  I noticed some code of a colleague today that initialized class variables in the initialization. However it was causing a warning, he says because of the order they are in. My question is why is it better to do variable initialization where it currently is and not within the curly brackets? DiagramScene::DiagramScene( int slideNo, QRectF screenRect, MainWindow* parent ) : QGraphicsScene( screenRect, parent ), myParent( parent ), slideUndoImageCurrentIndex(-1), nextGroupID(0), m_undoInProgress(false), m_deleteItemOnNextUndo(0) line(0), path(0) { /* Setup default brush for background */ scDetail->bgBrush.setStyle(Qt::SolidPattern); scDetail->bgBrush.setColor(Qt::white); setBackgroundBrush(scDetail->bgBrush); }

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• Prolog for beginners about logic and syntax

  - by lnotik

  Hello everybody. I have this question : I need to create a paradict "rightGuesses" which will get 3 arguments , each one of them is a list of letters : 1) The list of guessed letters 2) The word i have to guess 3) The letters that where guessed so far . for example : rightGuesses([n,o,p,q], [p,r,o,l,o,g], Ans). will give us Ans = [p, -, o, -, o, -]. i made: rightGuesses([],T2,[ANS]) rightGuesses([A|T1],T2,[ANS]):- (member(A,T2))=\=true , rightGuesses(T1,T2,[ _ |'-']). rightGuesses([A|T1],T2,[ANS]):- member(A,T2), rightGuesses(T1,T2,[ _ |A]). but i get : ERROR: c:/users/leonid/desktop/file3.pl:5:0: Syntax error: Operator expected Warning: c:/users/leonid/desktop/file3.pl:6: when i trying to compile it what is my problem , and is there is a better way to do it ? thanks in advance.

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• No-overflow cast on x64

  - by Cheeso

  I have an existing C codebase that works on x86. I'm now compiling it for x64. What I'd like to do is cast a size_t to a DWORD, and throw an exception if there's a loss of data. Q: Is there an idiom for this? Here's why I'm doing this: A bunch of Windows APIs accept DWORDs as arguments, and the code currently assumes sizeof(DWORD)==sizeof(size_t). That assumption holds for x86, but not for x64. So when compiling for x64, passing size_t in place of a DWORD argument, generates a compile-time warning. In virtually all of these cases the actual size is not going to exceed 2^32. But I want to code it defensively and explicitly. This is my first x64 project, so... be gentle.

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• SQL? "Show me all the Activities that can be performed by User X."

  - by Casey Fulton

  I'm at my wits end. I've searched like crazy, read plenty of database textbooks and God knows how many online guides, blogs and forums. Can someone put me out of my misery? PseudoSchema Diagram (Warning: although pretty, not in a format even remotely approaching ER diagrams! Primary keys are bold, foreign keys are italics.) Given the above set of tables relating Users to Groups to Privileges, and then a set of Activities that can each require a Privilege to perform, how do you find out this: Show me all the Activities that can be performed by User X. That is: User X is a member of groups G and F; groups G and F correlate to privileges P, Q, R and S; show me all the activities that require privileges either P, Q, R or S. How do you do this?

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• Zero KB SQLite File created by Core Data on application start up

  - by Tots

  I'm developing an iPhone application using Core Data. I had everything working and had to make an adjustment to the database schema and change the relationships through the xcdatamodel file. I deleted the my project's sqlite file in Library/Application Support/iPhone Simulator/3.1.3//Documents. Build and run the application, it creates the sqlite file, but its empty with a file size of 0 KB. At a minimum the table information should be in there. There are no errors/warning in the console. Anyone have an idea what is wrong?

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