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• How do I embed an expect script that takes in arguments into a bash shell script?

  - by fzkl

  I am writing a bash script which amongst many other things uses expect to automatically run a binary and install it by answering installer prompts. I was able to get my expect script to work fine when the expect script is called in my bash script with the command "expect $expectscriptname $Parameter". However, I want to embed the expect script into the shell script instead of having to maintain two separate script files for the job. I searched around and found that the procedure to embed expect into bash script was to declare a variable like VAR below and then echo it.: VAR=$(expect -c " #content of expect script here ") echo "$VAR" 1) I don't understand how echoing $VAR actually runs the expect script. Could anyone explain? 2) I am not sure how to pass $Parameter into VAR or to the echo statement. This is my main concern. Any ideas? Thanks.

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• sys.stdout not reassigning to sys.__stdout__

  - by Vince

  I'm pretty new to Python so I am still just learning the language. One of the things I came across was reassigning sys.stdout to change the default output of print. So I wrote this as a test: import sys sys.stdout = open('log.txt','a') print('hey') sys.stdout.close() sys.stdout = sys.__stdout__ print('hi') Now the string 'hi' is not written to the file but it does not show in the default output either. When I assign some other variable to sys.stdout in the beginning and change it back it works, but I'm just wondering why its not changing back the first time.

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• Java: initialization problem with private-final-int-value and empty constructor

  - by HH

  $ javac InitInt.java InitInt.java:7: variable right might not have been initialized InitInt(){} ^ 1 error $ cat InitInt.java import java.util.*; import java.io.*; public class InitInt { private final int right; InitInt(){} public static void main(String[] args) { // I don't want to assign any value. // just initialize it, how? InitInt test = new InitInt(); System.out.println(test.getRight()); // later assiging a value } public int getRight(){return right;} } Initialization problem with Constructor InitInt{ // Still the error, "may not be initialized" // How to initialise it? if(snippetBuilder.length()>(charwisePos+25)){ right=charwisePos+25; }else{ right=snippetBuilder.length()-1; } }

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• Does anyone know what these Oracle AQ JMS XA properties do?

  - by Alan Chan

  I'm using Oracle Advanced Queues via JMS from within Websphere App Server. Does anyone know what effect the following two properties have:- - oracle.jms.useEmulatedXA - oracle.jms.useNativeXA I have seen mentioned in some blogs and quick start guides, usually in sentences along the lines of "Add -Doracle.jms.useEmulatedXA=false -Doracle.jms.useNativeXA=true to the JAVA_PROPERTIES variable", without any explanation as to what they do:- e.g. http://biemond.blogspot.com/2008/11/using-aq-in-weblogic-103.html http://sqltech.cl/doc/oas10gR31/integrate.1013/b28994/adptr_aq.htm#CHDEADFB I'm curious as to what these two properties actually do, and what the implications of setting them are, even though they don't seem to have any affect on our app regardless of whether we set them or not. Googling hasn't given any answers, does anyone have any clue what they actually do?

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• zend_form ViewScript decorator / passing arguments

  - by timpone

  I have a form that is extend from Zend_Form. I am placing the form into a ViewScript decorator like this: $this->setDecorators(array(array('ViewScript', array('viewScript' => 'game/forms/game-management.phtml')))); I'd like to pass in a variable to this ViewScript but am not sure how this could be done. Since the partial renders out as a Zend_View (allowing $this-app_store_icon for rendering), it seems like there should be a way to pass variables to be rendered. I tried the following but to no avail. $this->setDecorators(array(array('ViewScript', array('viewScript' => 'game/forms/game-management.phtml'),array('app_store_picon'=>$current_app_store_picon)))); Any help on how to get this done would be appreciated. thanks

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• Setting a cookie before Javascript Redirection

  - by Jason

  Hello, I have a Rails app where I set a set a session variable the moment a user lands on my site with the referer and the page they hit. Additionally, I have Google Optimizer sending traffic from my homepage to various landing pages. The problem is that I think Google Optimizer is sending users away before the cookie is set. Is that even possible? I believe that the cookie is set from the HTTP Header, which must have fully loaded before Google's Javascript has even loaded. Thanks, Jason

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• Shared library linking and loading in BusyBox 0.61

  - by Alex Marshall

  Does anybody know how the dynamic linking and shared library loading works in BusyBox 0.61 ? I can't seem to find how this is done. There's no 'ld' present on the embedded system I'm dealing with, nor is there an LD_LIBRARY_PATH variable set anywhere. My motivation for this is to be able to create a symlink in the /lib directory to another directory on a different device (with considerably more storage space) for adding in more shared libraries, as the file system that contains /lib is a ramdisk that gets reloaded on startup and is within a few kb of being completely full (so we can't add more libraries to the image, nor can we obtain devices with more memory for the ramdisk)

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• How to find vector for the quaternion from X Y Z rotations

  - by can poyrazoglu

  I am creating a very simple project on OpenGL and I'm stuck with rotations. I am trying to rotate an object indepentdently in all 3 axes: X, Y, and Z. I've had sleepless nights due to the "gimbal lock" problem after rotating about one axis. I've then learned that quaternions would solve my problem. I've researched about quaternions and implementd it, but I havent't been able to convert my rotations to quaternions. For example, if I want to rotate around Z axis 90 degrees, I just create the {0,0,1} vector for my quaternion and rotate it around that axis 90 degrees using the code here: http://iphonedevelopment.blogspot.com/2009/06/opengl-es-from-ground-up-part-7_04.html (the most complicated matrix towards the bottom) That's ok for one vector, but, say, I first want to rotate 90 degrees around Z, then 90 degrees around X (just as an example). What vector do I need to pass in? How do I calculate that vector. I am not good with matrices and trigonometry (I know the basics and the general rules, but I'm just not a whiz) but I need to get this done. There are LOTS of tutorials about quaternions, but I seem to understand none (or they don't answer my question). I just need to learn to construct the vector for rotations around more than one axis combined. UPDATE: I've found this nice page about quaternions and decided to implement them this way: http://www.cprogramming.com/tutorial/3d/quaternions.html Here is my code for quaternion multiplication: void cube::quatmul(float* q1, float* q2, float* resultRef){ float w = q1[0]*q2[0] - q1[1]*q2[1] - q1[2]*q2[2] - q1[3]*q2[3]; float x = q1[0]*q2[1] + q1[1]*q2[0] + q1[2]*q2[3] - q1[3]*q2[2]; float y = q1[0]*q2[2] - q1[1]*q2[3] + q1[2]*q2[0] + q1[3]*q2[1]; float z = q1[0]*q2[3] + q1[1]*q2[2] - q1[2]*q2[1] + q1[3]*q2[0]; resultRef[0] = w; resultRef[1] = x; resultRef[2] = y; resultRef[3] = z; } Here is my code for applying a quaternion to my modelview matrix (I have a tmodelview variable that is my target modelview matrix): void cube::applyquat(){ float& x = quaternion[1]; float& y = quaternion[2]; float& z = quaternion[3]; float& w = quaternion[0]; float magnitude = sqrtf(w * w + x * x + y * y + z * z); if(magnitude == 0){ x = 1; w = y = z = 0; }else if(magnitude != 1){ x /= magnitude; y /= magnitude; z /= magnitude; w /= magnitude; } tmodelview[0] = 1 - (2 * y * y) - (2 * z * z); tmodelview[1] = 2 * x * y + 2 * w * z; tmodelview[2] = 2 * x * z - 2 * w * y; tmodelview[3] = 0; tmodelview[4] = 2 * x * y - 2 * w * z; tmodelview[5] = 1 - (2 * x * x) - (2 * z * z); tmodelview[6] = 2 * y * z - 2 * w * x; tmodelview[7] = 0; tmodelview[8] = 2 * x * z + 2 * w * y; tmodelview[9] = 2 * y * z + 2 * w * x; tmodelview[10] = 1 - (2 * x * x) - (2 * y * y); tmodelview[11] = 0; glMatrixMode(GL_MODELVIEW); glPushMatrix(); glLoadMatrixf(tmodelview); glMultMatrixf(modelview); glGetFloatv(GL_MODELVIEW_MATRIX, tmodelview); glPopMatrix(); } And my code for rotation (that I call externally), where quaternion is a class variable of the cube: void cube::rotatex(int angle){ float quat[4]; float ang = angle * PI / 180.0; quat[0] = cosf(ang / 2); quat[1] = sinf(ang/2); quat[2] = 0; quat[3] = 0; quatmul(quat, quaternion, quaternion); applyquat(); } void cube::rotatey(int angle){ float quat[4]; float ang = angle * PI / 180.0; quat[0] = cosf(ang / 2); quat[1] = 0; quat[2] = sinf(ang/2); quat[3] = 0; quatmul(quat, quaternion, quaternion); applyquat(); } void cube::rotatez(int angle){ float quat[4]; float ang = angle * PI / 180.0; quat[0] = cosf(ang / 2); quat[1] = 0; quat[2] = 0; quat[3] = sinf(ang/2); quatmul(quat, quaternion, quaternion); applyquat(); } I call, say rotatex, for 10-11 times for rotating only 1 degree, but my cube gets rotated almost 90 degrees after 10-11 times of 1 degree, which doesn't make sense. Also, after calling rotation functions in different axes, My cube gets skewed, gets 2 dimensional, and disappears (a column in modelview matrix becomes all zeros) irreversibly, which obviously shouldn't be happening with a correct implementation of the quaternions.

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• Javas Math.sin() produces NaN all the time

  - by milan1612

  Forgive me if this is a dumb beginners problem, but I really don't get it. I have a member variable declared like so: public Double Value; When I assign 3.14159265 to Value and try to compute the sine of it, this happens: system.out.println(Value.toString()); //outputs 3.14159265 Value = Math.sin(Value); system.out.println(Value.toString()); //outputs NaN In fact, this happens with every single value I tried - even with 0! Math.sin() seems to always produce NaN as a result, regardless of the arguments value. The docs say: If the argument is NaN or an infinity, then the result is NaN. But my argument is clearly not NaN or infinity! What the heck is happening there?

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• Are primitive types garbage collected in Android?

  - by snctln

  I know this may be a dumb question, but my background is more in c++ and managing my own memory. I am currently cutting down every single allocation that I can from one of my games to try and reduce the frequency of garbage collection and perceived "lag", so for every variable that I create that is an Object (String and Rect for example) I am making sure that I create it before hand in my constructor and not create temporary variables in simple 10 line functions... (I hope that makes sense) Anyways I was working though it some more tonight and I realized that I may be completely wrong about my assumption on garbage collection and primitive types (int, boolean, float) are these primitive type variables that I create in a 10 line function that gets called 20 times a second adding to my problem of garbage collection? So a year ago every few seconds I would see a message in logcat like GC freed 4010 objects / 484064 bytes in 101ms Now I see that message every 15-90 seconds or so... So to rephrase my question: Are primitive types (int, float, boolean, etc) included when seeing this message?

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• dynamically creating the #temp table and then used to insert the data

  - by praveen

  Hi All, I am importing an intermediate result of query into a temp table for further use, so I used a #temp table to maintain the same schema as select * into # temp from schema.tableName where 1<1; insert into # temp from exec(table) While I am doing this statement as a variable to pass the different tableName its not working SET @TEMPSCHEMA = 'SELECT * INTO #temp FROM ' + @PKSchema + '.dbo.' + @PKTableName + ' WHERE 1<1;' exec(@TEMPSCHEMA) INSERT INTO #temp EXEC ( @SELECTSTATEMENT ) however after exec statement it is not taking the values to the temp table. it is showing the invalid object id #temp

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• Maven problems using GAE and DataNucleus

  - by Wraith

  I'm having trouble retrieving 2 artifacts in my Maven/Java/Google App Engine project: com.google.appengine.orm:datanucleus-appengine:jar:1.0.7.final com.google.appengine:appengine-api-1.0-sdk:jar:1.3.4 There's a similar question posted, but each answer brings me back to the same error message. More detail I don't know if it is relevant, but rather than a version number, my original dependency for DataNucleus contained a variable. I am using Eclipse. <groupId>org.datanucleus</groupId> <artifactId>datanucleus-core</artifactId> <version>${datanucleus.version}</version> <scope>runtime</scope> I did not include my stack trace in Maven for brevity's sake. Please let me know if it would help to post it. Thank you.

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• [JavaScript] Global variables across multiple files

  - by Goro

  Hello, A bunch of my JavaScript code is in an external file called helpers.js. Inside the HTML that calls this JavaScript code I find myself in need of knowing if a certain function from helpers.js has been called. I have attempted to create a global variable by defining: var myFunctionTag = true; In global scope both in my HTML code and in helpers.js. Heres what my html code looks like: <html> ... <script type='text/javascript' src='js/helpers.js'></script> ... <script> var myFunctionTag = false; ... //I try to use myFunctionTag here but it is always false, even though it has been se t to 'true' in helpers.js </script> Is what I am trying to do even doable? Thanks,

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• Static initializer in Java

  - by Szere Dyeri

  My question is about one particular usage of static keyword. It is possible to use static keyword to cover a code block within a class which does not belong to any function. For example following code compiles: public class Test { private static final int a; static { a = 5; doSomething(a); } private static int doSomething(int x) { return (x+5); } } If you remove the static keyword it complains because the variable a is final. However it is possible to remove both final and static keywords and make it compile. It is confusing for me in both ways. How am I supposed to have a code section that does not belong to any method? How is it possible to invoke it? In general, what is the purpose of this usage? Or better, where can I find documentation about this?

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• Can somebody explain this Objective C method declaration syntax

  - by Doug R

  I'm working through an iPhone development book* without really knowing Objective C. For the most part I'm able to follow what's going on, but there are a few method declarations like the one below that I'm having a bit of trouble parsing. For example: - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger) section { return [self.controllers count]; //controllers is an instance variable of type NSArray in this class } It looks this is a method called numberOfRowsInSection, and it returns an NSInteger, and takes an NSInteger as a parameter which is locally called 'section'. But I don't understand all the references to tableView, or why this takes a parameter when it is not used within the method. Can somebody clarify this? Thanks. *p. 258, Beginning iPhone 3 Development, by Mark and LaMarche, published by Apress

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• Make a c# / wpf event fire only once?

  - by Donnie

  I have a case where I want a given event to execute once, and only once. I'm trying to do it this way, but I'm having prolems (else I wouldn't be asking). Note that the following code is inside the function that decides that the event needs to be fired. EventHandler h = delegate(Object sender, EventArgs e) { FiringControl.TheEvent -= h; // <-- Error, use of unassigned local variable "h" // Do stuff } FiringControl.TheEvent += h; In general this should work because of the way scope is preserved for delegates until after they're done running, but, since h is in the process of being built when I try to use it it is still considered to be "uninitialized", apparently.

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• How to execute T-SQL for several databases whose names are stored in a table

  - by emzero

  Hey guys, so here's the deal. I have several databases (SqlServer 2005) on the same server with the same schema but different data. I have one extra database which has one table storing the names of the mentioned databases. So what I need to do is to iterate over those databases name and actually "switch" to each one (use [dbname]) and execute a T-SQL script. Am I clear? Let me give you an example (simplified from the real one): CREATE TABLE DatabaseNames ( Id int, Name varchar(50) ) INSERT INTO DatabaseNames SELECT 'DatabaseA' INSERT INTO DatabaseNames SELECT 'DatabaseB' INSERT INTO DatabaseNames SELECT 'DatabaseC' Assume that DatabaseA, DatabaseB and DatabaseC are real existing databases. So let's say I need to create a new SP on those DBs. I need some script that loops over those databases and executes the T-SQL script I specify (maybe stored on a varchar variable or wherever). Any ideas? Thanks!

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• Are All Dynamic Languages Typo-friendly?

  - by yar

  With Java on one side and Ruby/Groovy on the other, I know that in the second camp I'm free to make typos which will not get caught until run-time. Is this true of all dynamically-typed languages? Edit: I've been asked to elaborate on the type of typo. In Ruby and in Groovy, you can assign to a variable with an accidental name that is never read. You can call methods that don't exist (obviously your tests should catch this, it's been said). You can refer to classes that don't exist, etc. etc. Basically any valid syntax, even with typographical errors, is valid in both Ruby and Groovy.

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• How to get the client ip address in ASP.Net MVC?

  - by melaos

  hi guys, i'm totally new to the asp.net mvc stack and i was wondering what happened to the simple Page object and the Request ServerVariables object? basically what i wanted to do is to pull out the client's pc ip address. but i fail to understand how the current MVC structure has changed all of this. as far as i can understand, most of the variable object has been replaced by the HttpRequest variants? anybody care to share some resources? really a sea of stuff to learn in the asp.net mvc world :) thanks.

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• parsing numbers in a javascript array

  - by George

  Hi I have a string of numbers separated by commas, "100,200,300,400,500" that I'm splitting into an array using the javascript split function: var data = []; data = dataString.split(","); I'm trying to parse the values of the array using parseFloat and then store them back into the array. I'd then like to add up the numbers in the array and store it as another variable, "dataSum". I've got the following code, but I can't get it working: var dataSum = ""; for (var i=0; i < data.length; i++) { parseFloat(data[i]); dataSum += data[i]; } So at the end of all this, I should be able to access any of the parsed numbers individually data[0], data[1], etc... and have a total number for dataSum. What am I doing wrong?

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• Is writing a reference atomic on 64bit VMs

  - by Steffen Heil

  Hi The java memory model mandates that writing a int is atomic: That is, if you write a value to it (consisting of 4 bytes) in one thread and read it in another, you will get all bytes or none, but never 2 new bytes and 2 old bytes or such. This is not guaranteed for long. Here, writing 0x1122334455667788 to a variable holding 0 before could result in another thread reading 0x112233440000000 or 0x0000000055667788. Now the specification does not mandate object references to be either int or long-sized. For type safety reasons I suspect they are guaranteed to be written atomiacally, but on a 64bit VM these references could be very well 64bit values (merely memory addresses). No here are my question: Are there any memory model specs covering this (that I haven't found)? Are long-writes suspect to be atomic on 64bit VMs? Are VMs forced to map references to 32bit? Regards, Steffen

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• Problem with WiX Votive 3.0 preprocessor

  - by Leith Bade

  I have just started using WiX for the first time. I added a WiX Votive project to my existing C project. To automatically select the correct source folder for the binaries add used the following: <Directory Id="INSTALLLOCATION" Name="Trapeze Capture For Objective" FileSource="$(var.CaptureForObjective.TargetDir)"> That results in the following error: 1C:\code\CaptureForObjective\Installer\Product.wxs(10,0): error CNDL0150: Undefined preprocessor variable '$(var.CaptureForObjective.TargetDir)'. The C project is called CaptureForObjective, and the WiX project is called Installer. What do I need to do to get this to work?

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• How to get XDebug working on Mac command line PHP

  - by Eugene M

  I recently installed Zend Server Community Edition on a Mac with Snow Leopard. I can't get XDebug to work ... it shows up in the output for phpinfo from a web browser, but when I var_dump() a variable, there is no special output, and when I run phpunit, code coverage reports aren't generated. Also when I type php -m at the command line, there is nothing for XDebug. I suspect that it's because the Mac is running the executable of PHP that was bundled with it instead of the executable of PHP that came with the Zend Server install. When I type /usr/local/zend/bin/php -m, XDebug does show up. I followed the instructions at http://akrabat.com/php/some-notes-on-zend-server-ce-for-mac-os-x/. Also I downloaded the xdebug.so from the Komodo web site. Zend Debugger and all other Zend extensions are disabled. So how can I get XDebug working correctly?

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• How to change line thickness in iText?

  - by drasto

  I'm drawing images to pdf using Java framework iText. I need to draw lines of specified width. There is a method setLineWidth(float width) in class PdfContentByte that should change it. However no matter what value I pass as its parameter the lines drawn are always extra thin. There is following line in javadoc of setLineWidth: The line width specifies the thickness of the line used to stroke a path and is measured in user space units. I don't know what is "space unit". Everything else in iText seems to be measured in point(around 1/72 inch). I cant find any reference to what are those "space units" and how to change them. code: to.setLineWidth(thickness); to.moveTo(x, y); to.lineTo(x + 100, y + 100); Variable to contains instance of PdfContentByte.

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• Java Logger with Servlets

  - by Sunny

  Hi Guys, I am using a wrapper class A which initializes the java.util.logger static class A { public static Logger logger; public static void init(){ logger = Logger.getLogger("test"); } Now, everywhere in my program I call A.init() and then logger.log("Message+uniqid"). But recently I moved to HTTP servlets and I am having problems. Basically, If a app is already running and the logger is logging... and someone else runs the app again, the logger from the previous instance stops and starts logging for the second one. Can anyone have a solution to how I should go about fixing this static variable issue? I can pass the logger into all constructor classes but thats really tedious. Any better solution would be appreciated..

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