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Migrate Spring JPA DAO unit testing to google app engine

- by twingocerise

I'm trying to put together a simple environment where I can get Spring, Maven, JPA, Google App Engine and DAO unit testing working happily all together. The goal is to be able to run a simple DAO unit test creating an entity and then load it again with a simple find to check it's been created properly - all of this from my maven build. My dao is making use of the JPA entity manager (query(), persist(), etc.) I've got it working no problem with hsqldb and a datasource, etc. but I'm struggling to get it working with appengine. My questions are: 1) I'm using an entity manager, injecting my persistence unit as followed. Is it OK? Is there any need for a datasource or something special? I thought not but correct me if I'm wrong. applicationContext.xml <bean id='entityManagerFactory' class='org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean'> <property name="persistenceUnitName" value="transactions-optional" /> </bean> Persistence.xml <persistence-unit name="transactions-optional"> <provider>org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider</provider> <properties> <property name="datanucleus.NontransactionalRead" value="true"/> <property name="datanucleus.NontransactionalWrite" value="true"/> <property name="datanucleus.ConnectionURL" value="appengine"/> </properties> </persistence-unit> 2) what are the dependencies I need to add to my pom file to be able to run the unit test making use of the entityManager? What about versions ? I found loads of things about appengine-api-labs/stubs/testing but none them got it working i.e. I'm getting jdo dependency missing while I'm using JPA... I also get loads of conflicts when I try to add some jars (datanucleus and stuff). So far I'm trying appengine-api-1.0-sdk v1.7.0 - ASM-all v3.3 - datanucleus core/api-jpa/enhancer v3.1.0 - datanucleus-appengine v2.0.1.1 and all the gae testing jars v1.7.0 3) Is there anything I need to add to my surefire plugin (test runner) to make sure it picks up all the dependencies? I'm getting an exhausting ClassNotFound on DatastorePersistenceProvider while it is in my classpath (I checked the jars and the mvn dependency:tree) I had a look at this but it doesn't seem to be working at all: http://www.vertigrated.com/blog/2011/02/working-maven-3-google-app-engine-plugin-with-gwt-support/ 4) Do I need to use any sot of localhelper to test my DAOs? Ideally I'd want to test my dao layer "as is" with the entity manager... what's your opinion ? Has anyone managed to run a unit test using JPA on google app engine ? 5) Do I need to set up any sort of gae.home somewhere in my pom file? Would anyone make use of it (a plugin or something) ? 6) Is the gwt-maven plugin any helpful if I don't use gwt - I'm writing a simple webservice making use of appengine, not a GWT app... Any help would be much appreciated as I've been struggling for 2 days now... Cheers, V.

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Foreign key not stored in child entity (one-to-many)

- by Kamil Los

Hi, I'm quite new to hibernate and have stumbled on this problem, which I can't find solution for. When persisting parent object (with one-to-many relationship with child), the foreign-key to this parent is not stored in child's table. My classes: Parent.java @javax.persistence.Table(name = "PARENT") @Entity public class PARENT { private Integer id; @javax.persistence.Column(name = "ID") @Id @GeneratedValue(strategy=GenerationType.AUTO) public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } private Collection<Child> children; @OneToMany(mappedBy = "parent", fetch = FetchType.EAGER, cascade = {CascadeType.ALL}) @Cascade({org.hibernate.annotations.CascadeType.ALL}) public Collection<Child> getChildren() { return children; } public void setChildren(Collection<Child> children) { this.children = children; } } Child.java @javax.persistence.Table(name = "CHILD") @Entity @IdClass(Child.ChildId.class) public class Child { private String childId1; @Id public String getChildId1() { return childId1; } public void setChildId1(String childId1) { this.childId1 = childId1; } private String childId2; @Id public String getChildId2() { return childId2; } public void setChildId2(String childId2) { this.childId2 = childId2; } private Parent parent; @ManyToOne @javax.persistence.JoinColumn(name = "PARENT_ID", referencedColumnName = "ID") public Parent getParent() { return parent; } public void setParent(Operation parent) { this.parent = parent; } public static class ChildId implements Serializable { private String childId1; @javax.persistence.Column(name = "CHILD_ID1") public String getChildId1() { return childId1; } public void setChildId1(String childId1) { this.childId1 = childId1; } private String childId2; @javax.persistence.Column(name = "CHIILD_ID2") public String getChildId2() { return childId2; } public void setChildId2(String childId2) { this.childId2 = childId2; } public ChildId() { } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; ChildId that = (ChildId) o; if (childId1 != null ? !childId1.equals(that.childId1) : that.childId1 != null) return false; if (childId2 != null ? !childId2.equals(that.childId2) : that.childId2 != null) return false; return true; } @Override public int hashCode() { int result = childId1 != null ? childId1.hashCode() : 0; result = 31 * result + (childId2 != null ? childId2.hashCode() : 0); return result; } } } Test.java public class Test() { private ParentDao parentDao; public void setParentDao(ParentDao parentDao) { this.parentDao = parentDao; } private ChildDao childDao; public void setChildDao(ChildDao childDao) { this.childDao = parentDao; } test1() { Parent parent = new Parent(); Child child = new Child(); child.setChildId1("a"); child.setChildId2("b"); ArrayList<Child> children = new ArrayList<Child>(); children.add(child); parent.setChildren(children); parent.setValue("value"); parentDao.save(parent); //calls hibernate's currentSession.saveOrUpdate(entity) } test2() { Parent parent = new Parent(); parent.setValue("value"); parentDao.save(parent); //calls hibernate's currentSession.saveOrUpdate(entity) Child child = new Child(); child.setChildId1("a"); child.setChildId2("b"); child.setParent(parent); childDao.save(); //calls hibernate's currentSession.saveOrUpdate(entity) } } When calling test1(), both entities get written to database, but field PARENT_ID in CHILD table stays empty. The only workaround I have so far is test2() - persisting parent first, and then the child. My goal is to persist parent and its children in one call to save() on Parent. Any ideas?

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Asus me302c create script crash

- by wxfred

State beforehand: So far, only Asus me302c would crash when it creates a script. This device can create renderscript context successfully 06-03 10:12:50.509: V/RenderScript_jni(3144): RS compat mode 06-03 10:12:50.509: V/RenderScript(3144): 0x610bbfc0 Launching thread(s), CPUs 4 06-03 10:12:50.549: D/libEGL(3144): loaded /vendor/lib/egl/libEGL_POWERVR_SGX544_115.so 06-03 10:12:50.559: D/libEGL(3144): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX544_115.so 06-03 10:12:50.559: D/libEGL(3144): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX544_115.so 06-03 10:12:50.619: D/OpenGLRenderer(3144): Enabling debug mode 0 06-03 10:12:52.869: D/dalvikvm(3144): Rejecting registerization due to ushr-int/lit8 v4, v7, (#19) When create a script, it crashed. 06-03 09:55:09.859: D/basefilter(26682): ===createScript=== 06-03 09:55:09.869: E/RenderScript(26682): Unable to open shared library (/data/data/xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxx.xxxx//lib/librs.basefilter.so): Cannot load library: soinfo_relocate(linker.cpp:975): cannot locate symbol "_Z3dotDv3_fS_" referenced by "librs.basefilter.so"... 06-03 09:55:09.869: E/RenderScript(26682): Unable to open system shared library (/system/lib/librs.basefilter.so): (null) 06-03 09:55:09.869: D/AndroidRuntime(26682): Shutting down VM 06-03 09:55:09.869: W/dalvikvm(26682): threadid=1: thread exiting with uncaught exception (group=0x418b9e10) 06-03 09:55:09.869: E/AndroidRuntime(26682): FATAL EXCEPTION: main 06-03 09:55:09.869: E/AndroidRuntime(26682): android.support.v8.renderscript.RSRuntimeException: Loading of ScriptC script failed. 06-03 09:55:09.869: E/AndroidRuntime(26682): at android.support.v8.renderscript.ScriptC.<init>(ScriptC.java:69) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.xxxxxx.ScriptC_BaseFilter.<init>(ScriptC_BaseFilter.java:41) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.xxxxxx.ScriptC_BaseFilter.<init>(ScriptC_BaseFilter.java:35) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.xxxxxx.xxxxxx.TeethWhiteningRSFilter.onCreateScript(TeethWhiteningRSFilter.java:19) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.xxxxxx.xxxxxx.TeethWhiteningRSFilter.onCreateScript(TeethWhiteningRSFilter.java:1) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.BaseRSFilter.createScript(BaseRSFilter.java:39) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxxxxxxx.RSFilterEngine.addFilter(RSFilterEngine.java:76) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxx.xxxx.BeautyActivity.changeBeautyEffect(BeautyActivity.java:277) 06-03 09:55:09.869: E/AndroidRuntime(26682): at xxx.xxxxxxxxxxx.xxxxxxxxx.xxxxx.xxxx.BeautyActivity$2.onClick(BeautyActivity.java:100) 06-03 09:55:09.869: E/AndroidRuntime(26682): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166) 06-03 09:55:09.869: E/AndroidRuntime(26682): at android.os.Handler.dispatchMessage(Handler.java:99) 06-03 09:55:09.869: E/AndroidRuntime(26682): at android.os.Looper.loop(Looper.java:152) 06-03 09:55:09.869: E/AndroidRuntime(26682): at android.app.ActivityThread.main(ActivityThread.java:5132) 06-03 09:55:09.869: E/AndroidRuntime(26682): at java.lang.reflect.Method.invokeNative(Native Method) 06-03 09:55:09.869: E/AndroidRuntime(26682): at java.lang.reflect.Method.invoke(Method.java:511) 06-03 09:55:09.869: E/AndroidRuntime(26682): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 06-03 09:55:09.869: E/AndroidRuntime(26682): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 06-03 09:55:09.869: E/AndroidRuntime(26682): at dalvik.system.NativeStart.main(Native Method) Now, I will post some related infomation. project.properties ... renderscript.target=9 renderscript.support.mode=true sdk.buildtools=19.0.3 device info Brand: Asus Model: ME302C OS: 4.2.2 CPU: Intel(R) Atom(TM) CPU Z2560 @1.60GHz GPU Renderer PowerVR SGX 544MP Finally, by the way, the same code runs well on Galaxy s2, s4, note 2.

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C++ Greatest Number Verification

- by Daniel

Hey guys, I was assigned to create a program that creates n arrays composed by 10 random integers. The the program should sum all the integers and display the result. After, it has to verify which of the sums is the greatest and it has to display that array and the result. Im having troubles getting it done and would like to get some help! Thanks once again. Here is my code so far: #include <iostream> #include <iomanip> #include <cmath> using namespace std; double random(unsigned int &seed); unsigned int seed = 5; void generateData(int set[10]); int sumData(int set[10]); void checkData(int sumResult, int arrayNumber); int main (int argc, char * const argv[]) { int arrayNumber, sumResult; int set[10]; do { cout << "Number of Arrays to Compare: " << endl; cin >> arrayNumber; } while (arrayNumber < 0); for (int i = 0; i < arrayNumber; ++i) { generateData(set); sumResult = sumData(set); cout << "Sum --> " << sumResult << endl; checkData(sumResult, arrayNumber); } return 0; } double random(unsigned int &seed) { const int MODULUS = 15749; const int MULTIPLIER = 69069; const int INCREMENT = 1; seed = ((MULTIPLIER * seed) + INCREMENT) % MODULUS; return double(seed) / double(MODULUS); } void generateData(int set[10]) { for (int i = 0; i < 10; ++i) { set[i] = int (5 + 6 * random(seed)); cout << set[i] << " || "; } } int sumData(int set[10]) { int sumTotal = 0; for (int i = 0; i < 10; ++i) sumTotal = sumTotal + set[i]; return sumTotal; } void checkData(int sumResult, int arrayNumber) { int largerNumber; int tempSet[2]; for (int i = 0; i < arrayNumber; ++i) { if (sumResult > largerNumber) { tempSet[i] = sumResult; } } }

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Use JQuery to target unwrapped text inside a div

- by Chris

I'm trying to find a way to wrap just the inner text of an element, I don't want to target any other inner dom elements. For example. <ul> <li class="this-one"> this is my item <ul> <li> this is a sub element </li> </ul> </li> </ul> I want to use jQuery to do this. <ul> <li class="this-one"> <div class="tree-item-text">this is my item</div> <ul> <li> <div class="tree-item-text">this is a sub element</div> </li> </ul> </li> </ul> A little background is I need to make an in-house tree structure ui element, So I'm using the UL structure to represent this. But I don't want developers to have to do any special formatting to use the widget. update: I just wanted to add the purpose of this is I want to add a click listener to be able to expand the elements under the li, However, since those elements are within the li the click listener will activate even when clicking on the children, So I want to attach it to the text instead, to do this the text needs to be targetable, which is why I want to wrap it in a div of it's own. So far I've come up with wrapping all the inner elements of the li in a div and then moving all inner dom elements back to the original parent. But this code is pretty heavy for something that might be much simpler and not require so much DOM manipulation. EDIT: Want to share the first pseudo alternative I came up with but I think it is very tasking for what I want to accomplish. var innerTextThing = $("ul.tree ul").parents("li").wrapInner("<div class='tree-node-text'>"); $(innerTextThing.find(".tree-node-text")).each(function(){ $(this).after($(this).children("ul")); }); Answered: I ended up doing the following, FYI i only have to worry about FF and IE compatibility so it's untested in other browsers. //this will wrap all li textNodes in a div so we can target them. $(that).find("li").contents() .filter(function () { return this.nodeType == 3; }).each(function () { if ( //these are for IE and FF compatibility (this.textContent != undefined && this.textContent.trim() != "") || (this.innerText != undefined && this.innerText.trim() != "") ) { $(this).wrap("<div class='tree-node-text'>"); } });

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How do I learn algorithms?

- by Panthe

Brief History: Just graduated high school, learned a bit of python and C++, have no friends with any helpful computer knowledge at all. Out of anyone i met in my school years I was probably the biggest nerd, but no one really knew. I consider my self to have a vast amount of knowledge on computers and tech then the average person. built/fixed tons of computers, and ability to troubleshoot pretty much any problem I came across. Now that high school is over, Ive really been thinking about my career. Loving, living computers for the past 15 years of my life I decided to take my ability's and try to learn computer programming, why I didn't start earlier I don't know, seems to be big mistake on my part... Doing some research I concluded that Python was the first programming language I should learn, since it was high level and easier to understand then C++ and Java. I also knew that to become good at what I did I needed to know more then just 2 or 3 languages, which didn't seem like a big problem considering once I learned the way Python worked, mainly syntax changed, and the rest would come naturally. I watched a couple of youtube videos, downloaded some book pdf's and snooped around from some tutorials here and there to get the hang of what to do. A two solid weeks had passed of trying to understand the syntax, create small programs that used the basic functions and understanding how it worked, I think i have got the hang of it. It breaks down into what ive been dealing with all this time (although i kinda knew) is that, input,output, loops, functions and other things derived from 0's and 1's storing data and recalling it, ect. (A VERY BASIC IDEA). Ive been able to create small programs, Hangman, file storing, temperature conversion, Caeser Cipher decode/encoding, Fibonacci Sequence and more, which i can create and understand how each work. Being 2 weeks into this, I have learned alot. Nothing at all compared to what i should be lear ning in the years to come if i get a grip on what I'm doing. While doing these programs I wont stop untill I've done doing a practice problem on a book, which embarresing enough will take me a couple hour depending on the complexity of it. I absolutly will not put aside the challenge until its complete, WHICH CAN BE EXTREMELY DRAINING, ive tried most problems without cheating and reached success, which makes me feel extremely proud of my self after completing something after much trial and error. After all this I have met the demon, alogrithm's which seem to be key to effiecent code. I cant seem to rap my head around some of the computer codes people put out there using numbers, and sometimes even basic functions, I have been able to understand them after a while but i know there are alot more complex things to come, considering my self smart, functions that require complex codes, actually hurt my brain. NOTHING EVER IN LIFE HURT MY BRAIN....... not even math classes in highschool, trying to understand some of the stuff people put out there makes me feel like i have a mental disadvantage lol... i still walk forward though, crossing my fingers that the understanding will come with time. Sorry if is this is long i just wish someone takes all these things into consideration when answering my question. even through all these downsides im still pushing through and continuing to try and get good at this, i know reading these tutorials wont make me any good unless i can become creative and make my own, understand other peoples programs, so this leads me to the simple question i could have asked in the beginning..... WHERE IN THE WORLD DO I START ? Ive been trying to find out how to understand some of the open source projects, how i can work with experianced coders to learn from them and help them, but i dont think thats even possible by the way how far people's knowledge is compared to me, i have no freinds who i can learn from, can someone help me and guide me into the right direction.. i have a huge motivation to get good at coding, anything information would be extremely helpful

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Building a modular Website with Zend Framework: Am I on the right way?

- by Oliver

Hi, i´m a little bit confused by reading all this posts an tutorials about staring with Zend, because there a so many different ways to solve a problem. I only need a feedback about my code to know if iam on the right way: To simply get a (hard coded) Navigation for my side (depending on who is logged in) i build a Controller Plugin with a postDispatch method that holds following code: public function postDispatch(Zend_Controller_Request_Abstract $request) { $menu = new Menu(); //Render menu in menu.phtml $view = new Zend_View(); //NEW view -> add View Helper $prefix = 'My_View_Helper'; $dir = dirname(__FILE__).'/../../View/Helper/'; $view->addHelperPath($dir,$prefix); $view->setScriptPath('../application/default/views/scripts/menu'); $view->menu = $menu->getMenu(); $this->getResponse()->insert('menu', $view->render('menu.phtml')); } Is it right that i need to set the helper path once again? I did this in a Plugin Controller named ViewSetup. There i do some setup for the view like doctype, headlinks, helper paths...(This step is from the book: Zend Framework in Action) The Menu class which is initiated looks like this: class Menu { protected $_menu = array(); /** * Menu for notloggedin and logged in */ public function getMenu() { $auth = Zend_Auth::getInstance(); $view = new Zend_View(); //check if user is logged in if(!$auth->hasIdentity()) { $this->_menu = array( 'page1' => array( 'label' => 'page1', 'title' => 'page1', 'url' => $view->url(array('module' => 'pages','controller' => 'my', 'action' => 'page1')) ), 'page2' => array( 'label' => 'page2', 'title' => 'page2', 'url' => $view->url(array('module' => 'pages','controller' => 'my', 'action' => 'page2')) ), 'page3' => array( 'label' => 'page3', 'title' => 'page3', 'url' => $view->url(array('module' => 'pages','controller' => 'my', 'action' => 'page3')) ), 'page4' => array( 'label' => 'page4', 'title' => 'page4', 'url' => $view->url(array('module' => 'pages','controller' => 'my', 'action' => 'page4')) ), 'page5' => array( 'label' => 'page5', 'title' => 'page5', 'url' => $view->url(array('module' => 'pages','controller' => 'my', 'action' => 'page5')) ) ); } else { //user is vom type 'client' //.. } return $this->_menu; } } Here´s my view script: <ul id="mainmenu"> <?php echo $this->partialLoop('menuItem.phtml',$this->menu) ?> </ul> This is working so far. My question is: is it usual to do it this way, is there anything to improve? I´m new to Zend and in the web are many deprecated tutorials which often is not obvious. Even the book is already deprecated where the autoloader is mentioned. Many thanks in advance

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wordexp followed by strcpy = EXC_BAD_ACCESS + sharedlibrary apply-load-rules-all

- by fyngyrz

The implication is a memory problem. I have static allocations for these: char akdir[400]; char homedir[400]; This crashes on the first strcpy(): void setuplibfoo() { long ii; double x; wordexp_t result; // This obtains the user's home directory // -------------------------------------- homedir[0]=0; // in case wordexp fails switch (wordexp("~/",&result,0)) { case 0: // Successful. We'll fall into deallocate when done. { strcpy(homedir,result.we_wordv[0]); // <<--- CRASH! strcpy(akdir,homedir); strcat(akdir,"ak-plugins/"); vs_status(akdir); } case WRDE_NOSPACE: // If the error was WRDE_NOSPACE, then { // perhaps part of the result was allocated. wordfree (&result); } default: // all other errors do not require deallocation { break; } } ...additional code clipped.. doesn't get there on crash. This is in a shared library I've written that is linked to my application, also something I've written. In this case, it doesn't get very far, although if it starts, it's fine. ...I've read the wordexp docs several times; they say they allocate new objects, so you just set up that type and call them with the address. The switch error model is right from the wordexp docs: http://www.gnu.org/s/libc/manual/html_mono/libc.html#Wordexp-Example It doesn't always crash. Just sometimes, and just under 10.6. Never under 10.5 I'm building debug mode with XCode 3.1.1, under OSX 10.5.8 it seems to run ok, I've not seen a crash -- under 10.6, it crashes... sometimes. But always with that same exception, and always in the same place. The Google has it that this actually means, somehow, that it's too soon to allocate memory. But all the instances I could find were memory errors on the part of the programmer. Overruns, etc. And I can't find any docs on when it IS safe to allocate memory. Now, the path that expands there is nowhere near 400 characters. it's this (it it completes): /Users/flake/ak-plugins/ and this: /Users/flake/ ...if it doesn't. the strcpy... copies 2nd param to first. Theirs to mine. And it works! under 10.5. :/ So is wordexp broke? Is 10.6 broke? Am I cRaZy? Here's the debugger output: 0x00013446 <+0049> call 0xc98da <dyld_stub_wordexp> 0x0001344b <+0054> test %eax,%eax 0x0001344d <+0056> je 0x13454 <setuplibfoo+63> 0x0001344f <+0058> jmp 0x134da <setuplibfoo+197> 0x00013454 <+0063> mov -0x1c(%ebp),%eax 0x00013457 <+0066> mov (%eax),%eax 0x00013459 <+0068> mov %eax,0x4(%esp) 0x0001345d <+0072> lea 0xb6cc2(%ebx),%eax 0x00013463 <+0078> mov (%eax),%eax 0x00013465 <+0080> mov %eax,(%esp) 0x00013468 <+0083> call 0xc9898 <dyld_stub_strcpy> 0x0001346d <+0088> lea 0xb6cc2(%ebx),%eax <<--CRASH!

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How to generate a random unique string with more than 2^30 combination. I also wanted to reverse the process. Is this possible?

- by Yusuf S

I have a string which contains 3 elements: a 3 digit code (example: SIN, ABD, SMS, etc) a 1 digit code type (example: 1, 2, 3, etc) a 3 digit number (example: 500, 123, 345) Example string: SIN1500, ABD2123, SMS3345, etc.. I wanted to generate a UNIQUE 10 digit alphanumeric and case sensitive string (only 0-9/a-z/A-Z is allowed), with more than 2^30 (about 1 billion) unique combination per string supplied. The generated code must have a particular algorithm so that I can reverse the process. For example: public static void main(String[] args) { String test = "ABD2123"; String result = generateData(test); System.out.println(generateOutput(test)); //for example, the output of this is: 1jS8g4GDn0 System.out.println(generateOutput(result)); //the output of this will be ABD2123 (the original string supplied) } What I wanted to ask is is there any ideas/examples/libraries in java that can do this? Or at least any hint on what keyword should I put on Google? I tried googling using the keyword java checksum, rng, security, random number, etc and also tried looking at some random number solution (java SecureRandom, xorshift RNG, java.util.zip's checksum, etc) but I can't seem to find one? Thanks! EDIT: My use case for this program is to generate some kind of unique voucher number to be used by specific customers. The string supplied will contains 3 digit code for company ID, 1 digit code for voucher type, and a 3 digit number for the voucher nominal. I also tried adding 3 random alphanumeric (so the final digit is 7 + 3 digit = 10 digit). This is what I've done so far, but the result is not very good (only about 100 thousand combination): public static String in ="somerandomstrings"; public static String out="someotherrandomstrings"; public static String encrypt(String kata) throws Exception { String result=""; String ina=in; String outa=out; Random ran = new Random(); Integer modulus=in.length(); Integer offset= ((Integer.parseInt(Utils.convertDateToString(new Date(), "SS")))+ran.nextInt(60))/2%modulus; result=ina.substring(offset, offset+1); ina=ina+ina; ina=ina.substring(offset, offset+modulus); result=result+translate(kata, ina, outa); return result; } EDIT: I'm sorry I forgot to put the "translate" function : public static String translate(String kata,String seq1, String seq2){ String result=""; if(kata!=null&seq1!=null&seq2!=null){ String[] a=kata.split(""); for (int j = 1; j < a.length; j++) { String b=a[j]; String[]seq1split=seq1.split(""); String[]seq2split=seq2.split(""); int hint=seq1.indexOf(b)+1; String sq=""; if(seq1split.length>hint) sq=seq1split[hint]; String sq1=""; if(seq2split.length>hint) sq1=seq2split[hint]; b=b.replace(sq, sq1); result=result+b; } } return result; }

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Undefined reference to vtable

- by RyanG

So, I'm getting the infamously horrible "undefined reference to 'vtable..." error for the following code (The class in question is CGameModule.) and I cannot for the life of me understand what the problem is. At first, I thought it was related to forgetting to give a virtual function a body, but as far as I understand, everything is all here. The inheritance chain is a little long, but here is the related source code. I'm not sure what other information I should provide. My code: class CGameModule : public CDasherModule { public: CGameModule(Dasher::CEventHandler *pEventHandler, CSettingsStore *pSettingsStore, CDasherInterfaceBase *pInterface, ModuleID_t iID, const char *szName) : CDasherModule(pEventHandler, pSettingsStore, iID, 0, szName) { g_pLogger->Log("Inside game module constructor"); m_pInterface = pInterface; } virtual ~CGameModule() {}; std::string GetTypedTarget(); std::string GetUntypedTarget(); bool DecorateView(CDasherView *pView) { //g_pLogger->Log("Decorating the view"); return false; } void SetDasherModel(CDasherModel *pModel) { m_pModel = pModel; } virtual void HandleEvent(Dasher::CEvent *pEvent); private: CDasherNode *pLastTypedNode; CDasherNode *pNextTargetNode; std::string m_sTargetString; size_t m_stCurrentStringPos; CDasherModel *m_pModel; CDasherInterfaceBase *m_pInterface; }; } Inherits from... class CDasherModule; typedef std::vector<CDasherModule*>::size_type ModuleID_t; /// \ingroup Core /// @{ class CDasherModule : public Dasher::CDasherComponent { public: CDasherModule(Dasher::CEventHandler * pEventHandler, CSettingsStore * pSettingsStore, ModuleID_t iID, int iType, const char *szName); virtual ModuleID_t GetID(); virtual void SetID(ModuleID_t); virtual int GetType(); virtual const char *GetName(); virtual bool GetSettings(SModuleSettings **pSettings, int *iCount) { return false; }; private: ModuleID_t m_iID; int m_iType; const char *m_szName; }; Which inherits from.... namespace Dasher { class CEvent; class CEventHandler; class CDasherComponent; }; /// \ingroup Core /// @{ class Dasher::CDasherComponent { public: CDasherComponent(Dasher::CEventHandler* pEventHandler, CSettingsStore* pSettingsStore); virtual ~CDasherComponent(); void InsertEvent(Dasher::CEvent * pEvent); virtual void HandleEvent(Dasher::CEvent * pEvent) {}; bool GetBoolParameter(int iParameter) const; void SetBoolParameter(int iParameter, bool bValue) const; long GetLongParameter(int iParameter) const; void SetLongParameter(int iParameter, long lValue) const; std::string GetStringParameter(int iParameter) const; void SetStringParameter(int iParameter, const std::string & sValue) const; ParameterType GetParameterType(int iParameter) const; std::string GetParameterName(int iParameter) const; protected: Dasher::CEventHandler *m_pEventHandler; CSettingsStore *m_pSettingsStore; }; /// @} #endif

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I want to write a program to control the square moving by using WINAPI

- by code_new

This is the code as attempted so far: #include <windows.h> LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppname[] = TEXT ("win0") ; WNDCLASS wndclass ; MSG msg ; HWND hwnd ; wndclass.style = CS_HREDRAW | CS_VREDRAW ; wndclass.cbWndExtra = 0 ; wndclass.cbClsExtra = 0 ; wndclass.lpfnWndProc = WndProc ; wndclass.lpszClassName = szAppname ; wndclass.lpszMenuName = NULL ; wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ; wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ; wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ; wndclass.hInstance = hInstance ; if (!RegisterClass (&wndclass)) { MessageBox (NULL, TEXT ("Register fail"), szAppname, 0) ; return 0 ; } hwnd = CreateWindow ( szAppname, TEXT ("mywin"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL) ; ShowWindow (hwnd, iCmdShow) ; UpdateWindow (hwnd) ; while (GetMessage (&msg, NULL, 0, 0)) { TranslateMessage (&msg) ; DispatchMessage (&msg) ; } return msg.wParam ; } LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { static int cxClient, cyClient, Left, Top, Right, Down ; PAINTSTRUCT ps ; HDC hdc ; RECT rect ; Right = 20 ; Down = 20 ; switch (message) { case WM_SIZE : cxClient = LOWORD (lParam) ; cyClient = HIWORD (lParam) ; return 0 ; case WM_PAINT : hdc = BeginPaint (hwnd, &ps) ; SetRect (&rect, Left, Top, Right, Down) ; FillRect (hdc, &rect, CreateSolidBrush (RGB (100, 100, 100))) ; EndPaint (hwnd, &ps) ; return 0 ; case WM_KEYDOWN : InvalidateRect (hwnd, &rect, TRUE) ; switch (wParam) { case VK_UP : if (Top - 20 < 0) { Top = 0 ; Down = 20 ; } else { Top -= 20 ; Down -= 20 ; } SendMessage (hwnd, WM_PAINT, wParam, lParam) ; break ; case VK_DOWN : if (Down + 20 > cyClient) { Down = cyClient ; Top = Down - 20 ; } else { Down += 20 ; Top += 20 ; }SendMessage (hwnd, WM_PAINT, wParam, lParam) ; break ; case VK_LEFT : if (Left - 20 < 0) { Left = 0 ; Right = 20 ; } else { Left -= 20 ; Right -= 20 ; }SendMessage (hwnd, WM_PAINT, wParam, lParam) ; break ; case VK_RIGHT : if (Right + 20 > cxClient) { Right = cxClient ; Left = Right - 20 ; } else { Right += 20 ; Left += 20 ; }SendMessage (hwnd, WM_PAINT, wParam, lParam) ; break ; default : break ; } return 0 ; case WM_DESTROY : PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam); } I considered that I didn't deal the message well, so I can't control it.

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BFS Shortest Path: Edge weight either 1 or 2

- by Hackster

I am trying to implement a shortest path algorithm using BFS. That is I am trying to find the shortest path from a specified vertex to every other vertex. However, its a special case where all edge weights are either 1 or 2. I know it could be done with Dijkstra's algorithm but I must use Breadth First Search. So far I have a working version of BFS that searches first for a vertex connected with an edge of weight 1. If it cannot find it, then returns a vertex connected with an edge of weight 2. After thinking about it, this is not the correct way to find the shortest path. The problem is I cannot think of any reasoning why BFS would work with weights 1 or 2, as opposed to any weight. Here is the code: public void addEdge(int start, int end, int weight) { adjMat[start][end] = 1; adjMat[end][start] = 1; edge_weight[start][end] = weight; edge_weight[end][start] = weight; } // ------------------------------------------------------------- public void bfs() // breadth-first search { // begin at vertex 0 vertexList[0].wasVisited = true; // mark it displayVertex(0); // display it theQueue.insert(0); // insert at tail int v2; while( !theQueue.isEmpty() ) // until queue empty, { int v1 = theQueue.remove(); // remove vertex at head // until it has no unvisited neighbors while( (v2=getAdjUnvisitedVertex(v1)) != -1 ){// get one, vertexList[v2].wasVisited = true; // mark it displayVertex(v2); // display it theQueue.insert(v2); // insert it } } // end while(queue not empty) // queue is empty, so we're done for(int j=0; j<nVerts; j++) // reset flags vertexList[j].wasVisited = false; } // end bfs() // ------------------------------------------------------------- // returns an unvisited vertex adj to v -- ****WITH WEIGHT 1**** public int getAdjUnvisitedVertex(int v) { for (int j = 0; j < nVerts; j++) if (adjMat[v][j] == 1 && vertexList[j].wasVisited == false && edge_weight[v][j] == 1){ //System.out.println("Vertex found with 1:"+ vertexList[j].label); return j; } for (int k = 0; k < nVerts; k++) if (adjMat[v][k] == 1 && vertexList[k].wasVisited == false && edge_weight[v][k] == 2){ //System.out.println("Vertex found with 2:"+vertexList[k].label); return k; } return -1; } // end getAdjUnvisitedVertex() // ------------------------------------------------------------- } //////////////////////////////////////////////////////////////// public class BFS{ public static void main(String[] args) { Graph theGraph = new Graph(); theGraph.addVertex('A'); // 0 (start for bfs) theGraph.addVertex('B'); // 1 theGraph.addVertex('C'); // 2 theGraph.addEdge(0, 1,2); // AB theGraph.addEdge(1, 2,1); // BC theGraph.addEdge(2, 0,1); // AD System.out.print("Visits: "); theGraph.bfs(); // breadth-first search System.out.println(); } // end main() } The problem then is, that I don't know why BFS can work for the shortest path problem with edges of weight 1 or 2 as opposed to any edges of any weight. Any help is appreciated. Thanks!

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Visual Studio reports that not all code path return a value, even though they do

- by chris12892

I have an API in NETMF C# that I am writing that includes a function to send an HTTP request. For those who are familiar with NETMF, this is a heavily modified version of the "webClient" example, which a simple application that demonstrates how to submit an HTTP request, and recive a response. In the sample, it simply prints the response and returns void,. In my version, however, I need it to return the HTTP response. For some reason, Visual Studio reports that not all code paths return a value, even though, as far as I can tell, they do. Here is my code... /// <summary> /// This is a modified webClient /// </summary> /// <param name="url"></param> private string httpRequest(string url) { // Create an HTTP Web request. HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest; // Set request.KeepAlive to use a persistent connection. request.KeepAlive = true; // Get a response from the server. WebResponse resp = request.GetResponse(); // Get the network response stream to read the page data. if (resp != null) { Stream respStream = resp.GetResponseStream(); string page = ""; byte[] byteData = new byte[4096]; char[] charData = new char[4096]; int bytesRead = 0; Decoder UTF8decoder = System.Text.Encoding.UTF8.GetDecoder(); int totalBytes = 0; // allow 5 seconds for reading the stream respStream.ReadTimeout = 5000; // If we know the content length, read exactly that amount of // data; otherwise, read until there is nothing left to read. if (resp.ContentLength != -1) { for (int dataRem = (int)resp.ContentLength; dataRem > 0; ) { Thread.Sleep(500); bytesRead = respStream.Read(byteData, 0, byteData.Length); if (bytesRead == 0) throw new Exception("Data laes than expected"); dataRem -= bytesRead; // Convert from bytes to chars, and add to the page // string. int byteUsed, charUsed; bool completed = false; totalBytes += bytesRead; UTF8decoder.Convert(byteData, 0, bytesRead, charData, 0, bytesRead, true, out byteUsed, out charUsed, out completed); page = page + new String(charData, 0, charUsed); } page = new String(System.Text.Encoding.UTF8.GetChars(byteData)); } else throw new Exception("No content-Length reported"); // Close the response stream. For Keep-Alive streams, the // stream will remain open and will be pushed into the unused // stream list. resp.Close(); return page; } } Any ideas? Thanks...

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Little Regular Expression (against HTML) help

- by Marcos Placona

Hi, I have the following HTML <p>Some text <a title="link" href="http://link.com/" target="_blank">my link</a> more text <a title="link" href="http://link.com/" target="_blank">more link</a>.</p> <p>Another paragraph.</p> <p>[code:cf]</p> <p><cfset ArrFruits = ["Orange", "Apple", "Peach", "Blueberry", </p> <p>"Blackberry", "Strawberry", "Grape", "Mango", </p> <p>"Clementine", "Cherry", "Plum", "Guava", </p> <p>"Cranberry"]></p> <p>[/code]</p> <p>Another line</p> <p><img src="http://image.jpg" alt="Array" /> </p> <p>More text</p> <p>[code:cf]</p> <p><table border="1"></p> <p> <cfoutput></p> <p> <cfloop array="#GroupsOf(ArrFruits, 5)#" index="arrFruitsIX"></p> <p> <tr></p> <p> <cfloop array="#arrFruitsIX#" index="arrFruit"></p> <p> <td>#arrFruit#</td></p> <p> </cfloop></p> <p> </tr></p> <p> </cfloop></p> <p> </cfoutput></p> <p></table></p> <p>[/code]</p> <p>With an output that looks like:</p> <p><img src="another_image.jpg" alt="" width="342" height="85" /></p> What I'm trying to do, is write a regular expression that will remove all the or , and whenever it finds a , it will replace it with a line-break. So far, my pattern looks like this: /\<p\>(.*?)(<\/p>)/g And I'm replacing the matches with: $1\n It all looks good, but it's also replacing the contents inside the [code][/code] tags, which in this case should not replace the tags at all, so as a result, i would lkike to get rid of the tags, when the content isn't inside the [code] tags. I can't ever get negation right, I know it will be something along the lines of \<p\>^\[code*\](.*?)(<\/p>) But obviously this doesn't work :-) Could anyone please lend me a hand with this regex? BTW, I know I shouldn't be using regular expressions to parse HTML at all. I'm fully aware of that, but still, for this specific case, I'd like to use regex. Thanks in advance

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Java SWT - placing image buttons on the image background

- by foma

I am trying to put buttons with images(gif) on the background which has already been set as an image (shell.setBackgroundImage(image)) and I can't figure out how to remove transparent border around buttons with images. I would be grateful if somebody could give me some tip about this issue. Here is my code: import org.eclipse.swt.widgets.*; import org.eclipse.swt.layout.*; import org.eclipse.swt.*; import org.eclipse.swt.graphics.*; public class Main_page { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); Image image = new Image(display, "bg.gif"); shell.setBackgroundImage(image); shell.setBackgroundMode(SWT.INHERIT_DEFAULT); shell.setFullScreen(true); Button button = new Button(shell, SWT.PUSH); button.setImage(new Image(display, "button.gif")); RowLayout Layout = new RowLayout(); shell.setLayout(Layout); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } } Sorceror, thanks for your answer I will definitely look into this article. Maybe I will find my way. So far I have improved my code a little bit. Firstly, I managed to get rid of the gray background noise. Secondly, I finally succeeded in creating the button as I had seen it in the first place. Yet, another obstacle has arisen. When I removed image(button) transparent border it turned out that the button change its mode(from push button to check box). The problem is that I came so close to the thing I was looking for and now I am a little puzzled. If you have some time please give a glance at my code. Here is the code, if you launch it you will see what the problem is(hope you didn't have problems downloading images): import org.eclipse.swt.widgets.*; import org.eclipse.swt.layout.*; import org.eclipse.swt.*; import org.eclipse.swt.graphics.*; public class Main_page { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); Image image = new Image(display, "bg.gif"); // Launch on a screen 1280x1024 shell.setBackgroundImage(image); shell.setBackgroundMode(SWT.TRANSPARENT); shell.setFullScreen(true); GridLayout gridLayout = new GridLayout(); gridLayout.marginTop = 200; gridLayout.marginLeft = 20; shell.setLayout(gridLayout); // If you replace SWT.PUSH with SWT.COLOR_TITLE_INACTIVE_BACKGROUND // you will see what I am looking for, despite nasty check box Button button = new Button(shell, SWT.PUSH); button.setImage(new Image(display, "moneyfast.gif")); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }

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move carat to the end of a text input field AND make the end visible

- by user322384

I'm going insane. I have an autosuggest box where users choose a suggestion. On the next suggestion selection the value of the text input box exceeds its size. I can move the carat to the end of the input field crossbrowser, no problem. But on Chrome and Safari I cannot SEE the carat at the end. The end of the text is not visible. Is there a way to move the carat to the end of a text input field AND have the end of the field visible so that the user is not confused about where the input carat went? what I got so far: <html> <head><title>Field update test</title></head> <body> <form action="#" method="POST" name="testform"> <p>After a field is updated the carat should be at the end of the text field AND the end of the text should be visible</p> <input type="text" name="testbox" value="" size="40"> <p><a href="javascript:void(0);" onclick="add_more_text();">add more text</a></p> </form> <script type="text/javascript">  </script> </body> </html> Thanks

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jQuery make child div visible on hover (on effective li element only, not parent!)

- by Dennis

I've already tried all of the existing posts related to this, but they doesn't work as I want it... The HTML: <ol class="sortable"> <li> <div> <a href="#">Start Page</a> <div class="li_options"> <a href="#"><img src="img/icons/small_add.png" /></a> <a href="#" onClick="[..]"><img src="img/icons/small_remove.png" /></a> </div> <div class="clear"></div> </div> <ol> <li> <div> <a href="#">Sub Seite</a> <div class="li_options"> <a href="#"><img src="img/icons/small_add.png" /></a> <a href="#" onClick="[..]"><img src="img/icons/small_remove.png" /></a> </div> <div class="clear"></div> </div> <ol> <li> <div> <a href="#">Sub Sub Seite</a> <div class="li_options"> <a href="#"><img src="img/icons/small_add.png" /></a> <a href="#" onClick="[..]"><img src="img/icons/small_remove.png" /></a> </div> <div class="clear"></div> </div> </li> </ol> </li> </ol> </li> <div class="clear"></div> This should look like this: Start Page Sub Page Sub Page I want the div.li_options which is set for every li element to be shown only on hovering element. I know, that the parent's li is also being "hovered" on hovering child elements, but I don't those "li_options" to be displayed. The best solution so far: $(document).ready(function() { $('.sortable li').mouseover(function() { $(this).children().children('.li_options').show(); }).mouseout(function() { $(this).children().children('.li_options').hide(); }); }); But with this, parents aren't being excluded... I don't know how to point on them, because there can be endless levels. Do you know how to get this working?

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Inheriting XML files and modifying values

- by Veehmot

This is a question about concept. I have an XML file, let's call it base: <base id="default"> <tags> <tag>tag_one</tag> <tag>tag_two</tag> <tag>tag_three</tag> </tags> <data> <data_a>blue</data_a> <data_b>3</data_b> </data> </base> What I want to do is to be able to extend this XML in another file, modifying individual properties. For example, I want to inherit that file and make a new one with a different data/data_a node: <base id="green" import="default"> <data> <data_a>green</data_a> </data> </base> So far it's pretty simple, it replaces the old data/data_a with the new one. I even can add a new node: <base id="ext" import="default"> <moredata> <data>extended version</data> </moredata> </base> And still it's pretty simple. The problem comes when I want to delete a node or deal with XML Lists (like the tags node). How should I reference a particular index on a list? I was thinking doing something like: <base id="diffList" import="default"> <tags> <tag index="1">this is not anymore tag_two</tag> </tags> </base> And for deleting a node / array index: <base id="deleting" import="default"> <tags> <tag index="2"/> </tags> <data/> </base>  <base> <tag>tag_one</tag> <tag>tag_two</tag> </base> But I'm not happy with my solutions. I don't know anything about XSLT or other XML transformation tools, but I think someone must have done this before. The key goal I'm looking for is ease to write the XML by hand (both the base and the "extended"). I'm open to new solutions besides XML, if they are easy to write manually. Thanks for reading.

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Rogue PropertyChanged notifications from ViewModel

- by user1886323

The following simple program is causing me a Databinding headache. I'm new to this which is why I suspect it has a simple answer. Basically, I have two text boxes bound to the same property myString. I have not set up the ViewModel (simply a class with one property, myString) to provide any notifications to the View for when myString is changed, so even although both text boxes operate a two way binding there should be no way that the text boxes update when myString is changed, am I right? Except... In most circumstances this is true - I use the 'change value' button at the bottom of the window to change the value of myString to whatever the user types into the adjacent text box, and the two text boxes at the top, even although they are bound to myString, do not change. Fine. However, if I edit the text in TextBox1, thus changing the value of myString (although only when the text box loses focus due to the default UpdateSourceTrigger property, see reference), TextBox2 should NOT update as it shouldn't receive any updates that myString has changed. However, as soon as TextBox1 loses focus (say click inside TextBox2) TextBox2 is updated with the new value of myString. My best guess so far is that because the TextBoxes are bound to the same property, something to do with TextBox1 updating myString gives TextBox2 a notification that it has changed. Very confusing as I haven't used INotifyPropertyChanged or anything like that. To clarify, I am not asking how to fix this. I know I could just change the binding mode to a oneway option. I am wondering if anyone can come up with an explanation for this strange behaviour? ViewModel: namespace WpfApplication1 { class ViewModel { public ViewModel() { _myString = "initial message"; } private string _myString; public string myString { get { return _myString; } set { if (_myString != value) { _myString = value; } } } } } View: <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WpfApplication1" Title="MainWindow" Height="350" Width="525"> <Window.DataContext> <local:ViewModel /> </Window.DataContext> <Grid>  <TextBox Height="23" HorizontalAlignment="Left" Margin="166,70,0,0" Name="textBox1" VerticalAlignment="Top" Width="120" Text="{Binding Path=myString, Mode=TwoWay}" /> <TextBox Height="23" HorizontalAlignment="Left" Margin="166,120,0,0" Name="textBox2" VerticalAlignment="Top" Width="120" Text="{Binding Path=myString, Mode=TwoWay}"/>  <Button Name="changevaluebutton" Content="change value" Click="ButtonUpdateArtist_Click" Margin="12,245,416,43" Width="75" /> <Button Content="Show value" Height="23" HorizontalAlignment="Left" Margin="12,216,0,0" Name="showvaluebutton" VerticalAlignment="Top" Width="75" Click="showvaluebutton_Click" /> <Label Content="" Height="23" HorizontalAlignment="Left" Margin="116,216,0,0" Name="showvaluebox" VerticalAlignment="Top" Width="128" /> <TextBox Height="23" HorizontalAlignment="Left" Margin="116,245,0,0" Name="changevaluebox" VerticalAlignment="Top" Width="128" />  <Label Content="TexBox1" Height="23" HorizontalAlignment="Left" Margin="99,70,0,0" Name="label1" VerticalAlignment="Top" Width="61" /> <Label Content="TexBox2" Height="23" HorizontalAlignment="Left" Margin="99,118,0,0" Name="label2" VerticalAlignment="Top" Width="61" /> </Grid> </Window> Code behind for view: namespace WpfApplication1 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { ViewModel viewModel; public MainWindow() { InitializeComponent(); viewModel = (ViewModel)this.DataContext; } private void showvaluebutton_Click(object sender, RoutedEventArgs e) { showvaluebox.Content = viewModel.myString; } private void ButtonUpdateArtist_Click(object sender, RoutedEventArgs e) { viewModel.myString = changevaluebox.Text; } } }

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How can I return an object into PHP userspace from my extension?

- by John Factorial

I have a C++ object, Graph, which contains a property named cat of type Category. I'm exposing the Graph object to PHP in an extension I'm writing in C++. As long as the Graph's methods return primitives like boolean or long, I can use the Zend RETURN_*() macros (e.g. RETURN_TRUE(); or RETURN_LONG(123);. But how can I make Graph-getCategory(); return a Category object for the PHP code to manipulate? I'm following the tutorial over at http://devzone.zend.com/article/4486, and here's the Graph code I have so far: #include "php_getgraph.h" zend_object_handlers graph_object_handlers; struct graph_object { zend_object std; Graph *graph; }; zend_class_entry *graph_ce; #define PHP_CLASSNAME "WFGraph" ZEND_BEGIN_ARG_INFO_EX(php_graph_one_arg, 0, 0, 1) ZEND_END_ARG_INFO() ZEND_BEGIN_ARG_INFO_EX(php_graph_two_args, 0, 0, 2) ZEND_END_ARG_INFO() void graph_free_storage(void *object TSRMLS_DC) { graph_object *obj = (graph_object*)object; delete obj-graph; zend_hash_destroy(obj-std.properties); FREE_HASHTABLE(obj-std.properties); efree(obj); } zend_object_value graph_create_handler(zend_class_entry *type TSRMLS_DC) { zval *tmp; zend_object_value retval; graph_object *obj = (graph_object*)emalloc(sizeof(graph_object)); memset(obj, 0, sizeof(graph_object)); obj-std.ce = type; ALLOC_HASHTABLE(obj-std.properties); zend_hash_init(obj-std.properties, 0, NULL, ZVAL_PTR_DTOR, 0); zend_hash_copy(obj-std.properties, &type-default_properties, (copy_ctor_func_t)zval_add_ref, (void*)&tmp, sizeof(zval*)); retval.handle = zend_objects_store_put(obj, NULL, graph_free_storage, NULL TSRMLS_CC); retval.handlers = &graph_object_handlers; return retval; } PHP_METHOD(Graph, __construct) { char *perspectives; int perspectives_len; Graph *graph = NULL; zval *object = getThis(); if(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &perspectives, &perspectives_len) == FAILURE) { RETURN_NULL(); } graph = new Graph(perspectives); graph_object *obj = (graph_object*)zend_object_store_get_object(object TSRMLS_CC); obj-graph = graph; } PHP_METHOD(Graph, hasCategory) { long perspectiveId; Graph *graph; graph_object *obj = (graph_object*)zend_object_store_get_object(getThis() TSRMLS_CC); graph = obj-graph; if (graph == NULL) { RETURN_NULL(); } if(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &perspectiveId) == FAILURE) { RETURN_NULL(); } RETURN_BOOL(graph-hasCategory(perspectiveId)); } PHP_METHOD(Graph, getCategory) { // what to do here? RETURN_TRUE; } function_entry php_getgraph_functions[] = { PHP_ME(Graph,__construct,NULL,ZEND_ACC_PUBLIC|ZEND_ACC_CTOR) PHP_ME(Graph,hasCategory,php_graph_one_arg,ZEND_ACC_PUBLIC) PHP_ME(Graph,getCategory,php_graph_one_arg,ZEND_ACC_PUBLIC) { NULL, NULL, NULL } }; PHP_MINIT_FUNCTION(getgraph) { zend_class_entry ce; INIT_CLASS_ENTRY(ce, PHP_CLASSNAME, php_getgraph_functions); graph_ce = zend_register_internal_class(&ce TSRMLS_CC); graph_ce-create_object = graph_create_handler; memcpy(&graph_object_handlers, zend_get_std_object_handlers(), sizeof(zend_object_handlers)); graph_object_handlers.clone_obj = NULL; return SUCCESS; } zend_module_entry getgraph_module_entry = { #if ZEND_MODULE_API_NO = 20010901 STANDARD_MODULE_HEADER, #endif PHP_GETGRAPH_EXTNAME, NULL, /* Functions */ PHP_MINIT(getgraph), NULL, /* MSHUTDOWN */ NULL, /* RINIT */ NULL, /* RSHUTDOWN */ NULL, /* MINFO */ #if ZEND_MODULE_API_NO = 20010901 PHP_GETGRAPH_EXTVER, #endif STANDARD_MODULE_PROPERTIES }; #ifdef COMPILE_DL_GETGRAPH extern "C" { ZEND_GET_MODULE(getgraph) } #endif

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How can I pipe two Perl CORE::system commands in a cross-platform way?

- by Pedro Silva

I'm writing a System::Wrapper module to abstract away from CORE::system and the qx operator. I have a serial method that attempts to connect command1's output to command2's input. I've made some progress using named pipes, but POSIX::mkfifo is not cross-platform. Here's part of what I have so far (the run method at the bottom basically calls system): package main; my $obj1 = System::Wrapper->new( interpreter => 'perl', arguments => [-pe => q{''}], input => ['input.txt'], description => 'Concatenate input.txt to STDOUT', ); my $obj2 = System::Wrapper->new( interpreter => 'perl', arguments => [-pe => q{'$_ = reverse $_}'}], description => 'Reverse lines of input input', output => { '>' => 'output' }, ); $obj1->serial( $obj2 ); package System::Wrapper; #... sub serial { my ($self, @commands) = @_; eval { require POSIX; POSIX->import(); require threads; }; my $tmp_dir = File::Spec->tmpdir(); my $last = $self; my @threads; push @commands, $self; for my $command (@commands) { croak sprintf "%s::serial: type of args to serial must be '%s', not '%s'", ref $self, ref $self, ref $command || $command unless ref $command eq ref $self; my $named_pipe = File::Spec->catfile( $tmp_dir, int \$command ); POSIX::mkfifo( $named_pipe, 0777 ) or croak sprintf "%s::serial: couldn't create named pipe %s: %s", ref $self, $named_pipe, $!; $last->output( { '>' => $named_pipe } ); $command->input( $named_pipe ); push @threads, threads->new( sub{ $last->run } ); $last = $command; } $_->join for @threads; } #... My specific questions: Is there an alternative to POSIX::mkfifo that is cross-platform? Win32 named pipes don't work, as you can't open those as regular files, neither do sockets, for the same reasons. 2. The above doesn't quite work; the two threads get spawned correctly, but nothing flows across the pipe. I suppose that might have something to do with pipe deadlocking or output buffering. What throws me off is that when I run those two commands in the actual shell, everything works as expected. Point 2 is solved; a -p fifo file test was not testing the correct file.

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Difficulty creating classes and arrays of those classes C#

- by Lucifer Fayte

I'm trying to implement a Discrete Fourier Transformation algorithm for a project I'm doing in school. But creating a class is seeming to be difficult(which it shouldn't be). I'm using Visual Studio 2012. Basically I need a class called Complex to store the two values I get from a DFT; The real portion and the imaginary portion. This is what I have so far for that: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace SoundEditor_V3 { public class Complex { public double real; public double im; public Complex() { real = 0; im = 0; } } } The problem is that it doesn't recognize the constructor as a constructor, now I'm just learning C#, but I looked it up online and this is how it's supposed to look apparently. It recognizes my constructor as a method. Why is that? Am I creating the class wrong? It's doing the same thing for my Fourier class as well. So each time I try to create a Fourier object and then use it's method...there is no such thing. example, I do this: Fourier fou = new Fourier(); fou.DFT(s, N, amp, 0); and it tells me fou is a 'field' but is used like a 'type' why is it saying that? Here is the code for my Fourier class as well: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace SoundEditor_V3 { public class Fourier { //FOURIER //N = number of samples //s is the array of samples(data) //amp is the array where the complex result will be written to //start is the where in the array to start public void DFT(byte[] s, int N, ref Complex[] amp, int start) { Complex tem = new Complex(); int f; int t; for (f = 0; f < N; f++) { tem.real = 0; tem.im = 0; for (t = 0; t < N; t++) { tem.real += s[t + start] * Math.Cos(2 * Math.PI * t * f / N); tem.im -= s[t + start] * Math.Sin(2 * Math.PI * t * f / N); } amp[f].real = tem.real; amp[f].im = tem.im; } } //INVERSE FOURIER public void IDFT(Complex[] A, ref int[] s) { int N = A.Length; int t, f; double result; for (t = 0; t < N; t++) { result = 0; for (f = 0; f < N; f++) { result += A[f].real * Math.Cos(2 * Math.PI * t * f / N) - A[f].im * Math.Sin(2 * Math.PI * t * f / N); } s[t] = (int)Math.Round(result); } } } } I'm very much stuck at the moment, any and all help would be appreciated. Thank you.

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java ioexception error=24 too many files open

- by MattS

I'm writing a genetic algorithm that needs to read/write lots of files. The fitness test for the GA is invoking a program called gradif, which takes a file as input and produces a file as output. Everything is working except when I make the population size and/or the total number of generations of the genetic algorithm too large. Then, after so many generations, I start getting this: java.io.FileNotFoundException: testfiles/GradifOut29 (Too many open files). (I get it repeatedly for many different files, the index 29 was just the one that came up first last time I ran it). It's strange because I'm not getting the error after the first or second generation, but after a significant amount of generations, which would suggest that each generation opens up more files that it doesn't close. But as far as I can tell I'm closing all of the files. The way the code is set up is the main() function is in the Population class, and the Population class contains an array of Individuals. Here's my code: Initial creation of input files (they're random access so that I could reuse the same file across multiple generations) files = new RandomAccessFile[popSize]; for(int i=0; i<popSize; i++){ files[i] = new RandomAccessFile("testfiles/GradifIn"+i, "rw"); } At the end of the entire program: for(int i=0; i<individuals.length; i++){ files[i].close(); } Inside the Individual's fitness test: FileInputStream fin = new FileInputStream("testfiles/GradifIn"+index); FileOutputStream fout = new FileOutputStream("testfiles/GradifOut"+index); Process process = Runtime.getRuntime().exec ("./gradif"); OutputStream stdin = process.getOutputStream(); InputStream stdout = process.getInputStream(); Then, later.... try{ fin.close(); fout.close(); stdin.close(); stdout.close(); process.getErrorStream().close(); }catch (IOException ioe){ ioe.printStackTrace(); } Then, afterwards, I append an 'END' to the files to make parsing them easier. FileWriter writer = new FileWriter("testfiles/GradifOut"+index, true); writer.write("END"); try{ writer.close(); }catch(IOException ioe){ ioe.printStackTrace(); } My redirection of stdin and stdout for gradif are from this answer. I tried using the try{close()}catch{} syntax to see if there was a problem with closing any of the files (there wasn't), and I got that from this answer. It should also be noted that the Individuals' fitness tests run concurrently. UPDATE: I've actually been able to narrow it down to the exec() call. In my most recent run, I first ran in to trouble at generation 733 (with a population size of 100). Why are the earlier generations fine? I don't understand why, if there's no leaking, the algorithm should be able to pass earlier generations but fail on later generations. And if there is leaking, then where is it coming from? UPDATE2: In trying to figure out what's going on here, I would like to be able to see (preferably in real-time) how many files the JVM has open at any given point. Is there an easy way to do that?

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Defend PHP; convince me it isn't horrible

- by Jason L

I made a tongue-in-cheek comment in another question thread calling PHP a terrible language and it got down-voted like crazy. Apparently there are lots of people here who love PHP. So I'm genuinely curious. What am I missing? What makes PHP a good language? Here are my reasons for disliking it: PHP has inconsistent naming of built-in and library functions. Predictable naming patterns are important in any design. PHP has inconsistent parameter ordering of built-in functions, eg array_map vs. array_filter which is annoying in the simple cases and raises all sorts of unexpected behaviour or worse. The PHP developers constantly deprecate built-in functions and lower-level functionality. A good example is when they deprecated pass-by-reference for functions. This created a nightmare for anyone doing, say, function callbacks. A lack of consideration in redesign. The above deprecation eliminated the ability to, in many cases, provide default keyword values for functions. They fixed this in PHP 5, but they deprecated the pass-by-reference in PHP 4! Poor execution of name spaces (formerly no name spaces at all). Now that name spaces exist, what do we use as the dereference character? Backslash! The character used universally for escaping, even in PHP! Overly-broad implicit type conversion leads to bugs. I have no problem with implicit conversions of, say, float to integer or back again. But PHP (last I checked) will happily attempt to magically convert an array to an integer. Poor recursion performance. Recursion is a fundamentally important tool for writing in any language; it can make complex algorithms far simpler. Poor support is inexcusable. Functions are case insensitive. I have no idea what they were thinking on this one. A programming language is a way to specify behavior to both a computer and a reader of the code without ambiguity. Case insensitivity introduces much ambiguity. PHP encourages (practically requires) a coupling of processing with presentation. Yes, you can write PHP that doesn't do so, but it's actually easier to write code in the incorrect (from a sound design perspective) manner. PHP performance is abysmal without caching. Does anyone sell a commercial caching product for PHP? Oh, look, the designers of PHP do. Worst of all, PHP convinces people that designing web applications is easy. And it does indeed make much of the effort involved much easier. But the fact is, designing a web application that is both secure and efficient is a very difficult task. By convincing so many to take up programming, PHP has taught an entire subgroup of programmers bad habits and bad design. It's given them access to capabilities that they lack the understanding to use safely. This has led to PHP's reputation as being insecure. (However, I will readily admit that PHP is no more or less secure than any other web programming language.) What is it that I'm missing about PHP? I'm seeing an organically-grown, poorly-managed mess of a language that's spawning poor programmers. So convince me otherwise!

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Normalizing a table

- by Alex

I have a legacy table, which I can't change. The values in it can be modified from legacy application (application also can't be changed). Due to a lot of access to the table from new application (new requirement), I'd like to create a temporary table, which would hopefully speed up the queries. The actual requirement, is to calculate number of business days from X to Y. For example, give me all business days from Jan 1'st 2001 until Dec 24'th 2004. The table is used to mark which days are off, as different companies may have different days off - it isn't just Saturday + Sunday) The temporary table would be created from a .NET program, each time user enters the screen for this query (user may run query multiple times, with different values, table is created once), so I'd like it to be as fast as possible. Approach below runs in under a second, but I only tested it with a small dataset, and still it takes probably close to half a second, which isn't great for UI - even though it's just the overhead for first query. The legacy table looks like this: CREATE TABLE [business_days]( [country_code] [char](3) , [state_code] [varchar](4) , [calendar_year] [int] , [calendar_month] [varchar](31) , [calendar_month2] [varchar](31) , [calendar_month3] [varchar](31) , [calendar_month4] [varchar](31) , [calendar_month5] [varchar](31) , [calendar_month6] [varchar](31) , [calendar_month7] [varchar](31) , [calendar_month8] [varchar](31) , [calendar_month9] [varchar](31) , [calendar_month10] [varchar](31) , [calendar_month11] [varchar](31) , [calendar_month12] [varchar](31) , misc. ) Each month has 31 characters, and any day off (Saturday + Sunday + holiday) is marked with X. Each half day is marked with an 'H'. For example, if a month starts on a Thursday, than it will look like (Thursday+Friday workdays, Saturday+Sunday marked with X): ' XX XX ..' I'd like the new table to look like so: create table #Temp (country varchar(3), state varchar(4), date datetime, hours int) And I'd like to only have rows for days which are off (marked with X or H from previous query) What I ended up doing, so far is this: Create a temporary-intermediate table, that looks like this: create table #Temp_2 (country_code varchar(3), state_code varchar(4), calendar_year int, calendar_month varchar(31), month_code int) To populate it, I have a union which basically unions calendar_month, calendar_month2, calendar_month3, etc. Than I have a loop which loops through all the rows in #Temp_2, after each row is processed, it is removed from #Temp_2. To process the row there is a loop from 1 to 31, and substring(calendar_month, counter, 1) is checked for either X or H, in which case there is an insert into #Temp table. [edit added code] Declare @country_code char(3) Declare @state_code varchar(4) Declare @calendar_year int Declare @calendar_month varchar(31) Declare @month_code int Declare @calendar_date datetime Declare @day_code int WHILE EXISTS(SELECT * From #Temp_2) -- where processed = 0) BEGIN Select Top 1 @country_code = t2.country_code, @state_code = t2.state_code, @calendar_year = t2.calendar_year, @calendar_month = t2.calendar_month, @month_code = t2.month_code From #Temp_2 t2 -- where processed = 0 set @day_code = 1 while @day_code <= 31 begin if substring(@calendar_month, @day_code, 1) = 'X' begin set @calendar_date = convert(datetime, (cast(@month_code as varchar) + '/' + cast(@day_code as varchar) + '/' + cast(@calendar_year as varchar))) insert into #Temp (country, state, date, hours) values (@country_code, @state_code, @calendar_date, 8) end if substring(@calendar_month, @day_code, 1) = 'H' begin set @calendar_date = convert(datetime, (cast(@month_code as varchar) + '/' + cast(@day_code as varchar) + '/' + cast(@calendar_year as varchar))) insert into #Temp (country, state, date, hours) values (@country_code, @state_code, @calendar_date, 4) end set @day_code = @day_code + 1 end delete from #Temp_2 where @country_code = country_code AND @state_code = state_code AND @calendar_year = calendar_year AND @calendar_month = calendar_month AND @month_code = month_code --update #Temp_2 set processed = 1 where @country_code = country_code AND @state_code = state_code AND @calendar_year = calendar_year AND @calendar_month = calendar_month AND @month_code = month_code END I am not an expert in SQL, so I'd like to get some input on my approach, and maybe even a much better approach suggestion. After having the temp table, I'm planning to do (dates would be coming from a table): select cast(convert(datetime, ('01/31/2012'), 101) -convert(datetime, ('01/17/2012'), 101) as int) - ((select sum(hours) from #Temp where date between convert(datetime, ('01/17/2012'), 101) and convert(datetime, ('01/31/2012'), 101)) / 8) Besides the solution of normalizing the table, the other solution I implemented for now, is a function which does all this logic of getting the business days by scanning the current table. It runs pretty fast, but I'm hesitant to call a function, if I can instead add a simpler query to get result. (I'm currently trying this on MSSQL, but I would need to do same for Sybase ASE and Oracle)

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