Search Results

Search found 21111 results on 845 pages for 'null pointer'.

Page 398/845 | < Previous Page | 394 395 396 397 398 399 400 401 402 403 404 405  | Next Page >

• How to make a plot from summaryRprof?

  - by ThorDivDev

  This is a question for an university assignment. I was given three algorithms to calculate the GCD that I already did. My problem is getting the Rprof results to a plot so I can compare them side by side. From what little understanding I have about Rprof, summaryRprof and plot is that Rprof is used like this: Rprof() #To start #functions here Rprof(NULL) #TO end summaryRprof() # to print results I understand that plot has many different types of inputs, x and y values and something called a data frame which I assume is a fancy word for table. and to draw different lines and things I need to use this: http://www.harding.edu/fmccown/r/ what I cant figure out is how to get the summaryRprof results to the plot() function. > Rprof(filename="RProfOut2.out", interval=0.0001) > gcdBruteForce(10000, 33) [1] 1 > gcdEuclid(10000, 33) [1] 1 > gcdPrimeFact(10000, 33) [1] 1 > Rprof(NULL) > summaryRprof() ?????plot???? I have been reading on stack overflow that and other sites that I can also try to use profr and proftools although I am not very clear on the usage. The only graph I have been able to make is one using plot(system.time(gcdFunction(10,100))) As always any help is appreciated.

  Read the article

• Strange befaviour of spring transaction support for JPA + Hibernate +@Transactional annotation

  - by abovesun

  I found out really strange behavior on relatively simple use case, probably I can't understand it because of not deep knowledges of spring @Transactional nature, but this is quite interesting. I have simple User dao that extends spring JpaDaoSupport class and contains standard save method: @Transactional public User save(User user) { getJpaTemplate().persist(user); return user; } If was working fine until I've add new method to same class: User getSuperUser(), this method should return user with isAdmin == true, and if there is no super user in db, method should create one. Thats how it was looking like: public User createSuperUser() { User admin = null; try { admin = (User) getJpaTemplate().execute(new JpaCallback() { public Object doInJpa(EntityManager em) throws PersistenceException { return em.createQuery("select u from UserImpl u where u.admin = true").getSingleResult(); } }); } catch (EmptyResultDataAccessException ex) { User admin = new User('login', 'password'); admin.setAdmin(true); save(admin); // THIS IS THE POINT WHERE STRANGE THING COMING OUT } return admin; } As you see code is strange forward and I was very confused when found out that no transaction was created and committed on invocation of save(admin) method and no new user wasn't actually created despite @Transactional annotation. In result we have situation: when save() method invokes from outside of UserDAO class - @Transactional annotation counted and user successfully created, but if save() invokes from inside of other method of the same dao class - @Transactional annotation ignored. Here how I was change save() method to force it always create transaction. public User save(User user) { getJpaTemplate().execute(new JpaCallback() { public Object doInJpa(EntityManager em) throws PersistenceException { em.getTransaction().begin(); em.persist(user); em.getTransaction().commit(); return null; } }); return user; } As you see I manually invoke begin and commit. Any ideas?

  Read the article

• Passing models between controllers in MVC4

  - by wtfsven

  I'm in the middle of my first foray into web development with MVC4, and I've run into a problem that I just know is one of the core issues in web development in general, but can't seem to wrap my mind around it. So I have two models: Employee and Company. Employee has a Company, therefore /Employee/Create contains a field that is either a dropdown list for selecting an existing Company, or an ActionLink to /Company/Create if none exists. But here's the issue: If a user has to create a Company, I need to preserve the existing Employee model across both Views--over to /Company/Create, then back to /Employee/Create. So my first approach was to pass the Employee model to /Company/Create with a @Html.ActionLink("Add...", "Create", "Organization", Model , null), but then when I get to Company's Create(Employee emp), all of emp's values are null. The second problem is that if I try to come back to /Employee/Create, I'd be passing back an Employee, which would resolve to the POST Action. Basically, the whole idea is to save the state of the /Employee/Create page, jump over to /Company/Create to create a Company record, then back to /Employee/Create to finish creating the Employee. I know there is a well understood solution to this because , but I can't seem to phase it well enough to get a good Google result out of it. I've though about using Session, but it seems like doing so would be a bit of a kludge. I'd really like an elegant solution to this.

  Read the article

• how to Clean up(destructor) a dynamic Array of pointers??

  - by Ahmed Sharara

  Is that Destructor is enough or do I have to iterate to delete the new nodes?? #include "stdafx.h" #include<iostream> using namespace std; struct node{ int row; int col; int value; node* next_in_row; node* next_in_col; }; class MultiLinkedListSparseArray { private: char *logfile; node** rowPtr; node** colPtr; // used in constructor node* find_node(node* out); node* ins_node(node* ins,int col); node* in_node(node* ins,node* z); node* get(node* in,int row,int col); bool exist(node* so,int row,int col); //add anything you need public: MultiLinkedListSparseArray(int rows, int cols); ~MultiLinkedListSparseArray(); void setCell(int row, int col, int value); int getCell(int row, int col); void display(); void log(char *s); void dump(); }; MultiLinkedListSparseArray::MultiLinkedListSparseArray(int rows,int cols){ rowPtr=new node* [rows+1]; colPtr=new node* [cols+1]; for(int n=0;n<=rows;n++) rowPtr[n]=NULL; for(int i=0;i<=cols;i++) colPtr[i]=NULL; } MultiLinkedListSparseArray::~MultiLinkedListSparseArray(){ // is that destructor enough?? cout<<"array is deleted"<<endl; delete [] rowPtr; delete [] colPtr; }

  Read the article

• How to pick a specific object from a Linq Query using Distinct?

  - by Holli

  I have a list with two or more objects of class Agent. Name = "A" Priority = 0 ResultCount = 100 ; Name = "B" Priority = 1 ResultCount = 100 ; Both objects have the same ResultCount. In that case I only need one object and not two or more. I did this with a Linq Query with Distinct and an custom made Comparer. IEnumerable<Agent> distinctResultsAgents = (from agt in distinctUrlsAgents select agt).Distinct(comparerResultsCount); With this query I get only one object from the list but I never know which one. But I don't want just any object, I want object "B" because the Priority is higher then object "A". How can I do that? My custom Comparer is very simple and has a method like this: public bool Equals(Agent x, Agent y) { if (x == null || y == null) return false; if (x.ResultCount == y.ResultCount) return true; return false; }

  Read the article

• Windows 7 stopped booting

  - by jstawski

  I have a laptop which after shutdown it stopped booting. I tried repair, safe mode, and even start with Windows 7 Installation. The screen just goes blank with a mouse pointer that I can move around. I removed the harddrive from the laptop and connected it to my desktop using an External HD casing. The computer recognizes the disk, but it seems like it can't read it. If I go to My Computer it shows up, but it doesn't display usage information. When I double click on the drive it sits there as if it was loading something and eventually shows "G:\ is not accessible. The parameter is incorrect." Disk Management and Diskpart also take forever to load and when it does it shows the drive. My question, do you think this is a hardware problem or some corrupted sector? How can I try to fix the drive without formatting it? Thanks...

  Read the article

• Scheme Function to reverse elements of list of 2-list

  - by sudhirc

  This is an exercise from EOPL. Procedure (invert lst) takes lst which is a list of 2-lists and returns a list with each 2-list reversed. (define invert (lambda (lst) (cond((null? lst ) '()) ((= 2 (rtn-len (car lst))) ( cons(swap-elem (car lst)) (invert (cdr lst)))) ("List is not a 2-List")))) ;; Auxiliry Procedure swap-elements of 2 element list (define swap-elem (lambda (lst) (cons (car (cdr lst)) (car lst)))) ;; returns lengh of the list by calling (define rtn-len (lambda (lst) (calc-len lst 0))) ;; calculate length of the list (define calc-len (lambda (lst n) (if (null? lst) n (calc-len (cdr lst) (+ n 1))))) This seems to work however looks very verbose. Can this be shortened or written in more elegant way ? How I can halt the processing in any of the individual element is not a 2-list? At the moment execution proceed to next member and replacing current member with "List is not a 2-List" if current member is not a 2-list.

  Read the article

• Send Automated Email through Windows Service that has an embedded image using C#

  - by Refracted Paladin

  I already have a C# windows service that we use internally to monitor a directory on our network and when it detects a change sends off an email using our internal SMTP server to the specified groups of people. Now I need to embedd an image in that automated email. I understand that I need to create an AlternateView and a Linked Resource and use the Linked Resource's cID in the AlternateView, correct. What I do not understand is where do I put the image? Should I add it to my service project and set Copy to Output Directory = Copy Always? If so, how would I then access when creating my LinkedResource? Also, where do I put the image on the Server hosting the Service? Here is what I have so far but it doesn't seem to work. I don't get any errors, that I am aware of, but I do not get an email either. I am guessing it is looking for the image but that I do not have it in the correct location. // This event is called when an object(file,folder) is created in the srcPath void WatcherCreated(object source , FileSystemEventArgs e) { var folderName = e.Name; var folderPath = e.FullPath; MailMessage mail = new MailMessage(); mail.From = new MailAddress("[email protected]"); mail.To.Add("[email protected]"); mail.Subject = "New Enrollment for " + folderName; AlternateView plainView = AlternateView.CreateAlternateViewFromString("This is the plain text view", null, "text/html"); AlternateView htmlView = AlternateView.CreateAlternateViewFromString("Here is an embedded image. <img src=cid:enrollProcessID>", null, "text/html"); LinkedResource imageResourceLink = new LinkedResource("EnrollmentProcess.jpg") {ContentId = "enrollProcessID"}; htmlView.LinkedResources.Add(imageResourceLink); mail.AlternateViews.Add(plainView); mail.AlternateViews.Add(htmlView); var smtp = new SmtpClient("internalSMTP"); smtp.Send(mail); }

  Read the article

• Parsing XML elements with dynamic namespace prefix in PHP

  - by BugKiller

  I have the following XML ( you can say SOAP request ) : <SOAPENV:Envelope xmlns:SOAPENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:NS="http://xyz.gov/headerschema" > <SOAPENV:Header> <NS:myHeader> <NS:SourceID>223423</NS:SourceID> </NS:myHeader> </SOAPENV:Header> </SOAPENV:Envelope> I use the following code and it works fine : <?php $myRequest ='<SOAPENV:Envelope xmlns:SOAPENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:NS="http://xyz.gov/headerschema" > <SOAPENV:Header> <NS:myHeader> <NS:SourceID>223423</NS:SourceID> </NS:myHeader> </SOAPENV:Header> </SOAPENV:Envelope>'; $xml = simplexml_load_string($myRequest, NULL, NULL, "http://schemas.xmlsoap.org/soap/envelope/"); $namespaces = $xml->getNameSpaces(true); $soapHeader = $xml->children($namespaces['SOAPENV'])->Header; $myHeader = $soapHeader->children($namespaces['NS'])->myHeader; echo (string)$myHeader->SourceID; ?> The Problem I know the prefix ( SOAPENV + NS ) , but the clients could change the prefix to whatever they want, so they may send me xml document that has ( MY-SOAPENV + MY-NS) prefixes. My Question How can I handle this since the namespace prefixes are not static , how can I parse it ? Thanks

  Read the article

• Object inside of array -- works in one scope but not in another?

  - by Earlz

  Ok I've been learning some of the more advanced aspects of Javascript and now trying to use this I'm stuck. Here is my code: function Data(){} function init(state){ var item; item=new Data(); item.fieldrid=17; item.description='foo'; state.push(item); }; function findInState(state,fieldrid) { for (var item in state) { alert(item.fieldrid); //prints undefined if (item.fieldrid == fieldrid) { return item; } } return null; } var s=[]; init(s); alert(s[0].fieldrid); //prints 17 (expected) alert(findInState(s,17).fieldrid); //exception here. function returns null. A running example is here at jsbin Why does this not work? I would expect the alert in findInState to yield 17 but instead it yields undefined. What am I doing wrong?

  Read the article

• JarEntry.getSize() is returning -1 when the jar files is opened as InputStream from URL

  - by Reshma Donthireddy

  I am trying to read file from the JarInputStream and the size of file is returning -1. I am accessing Jar file from the URL as a inputStream. URLConnection con = url.openConnection(); JarInputStream jis = new JarInputStream(con.getInputStream()); JarEntry je = null; while ((je = jis.getNextJarEntry()) != null) { htSizes.put(je.getName(), new Integer((int) je.getSize())); if (je.isDirectory()) { continue; } int size = (int) je.getSize(); // -1 means unknown size. if (size == -1) { size = ((Integer) htSizes.get(je.getName())).intValue(); } byte[] b = new byte[(int) size]; int rb = 0; int chunk = 0; while (((int) size - rb) > 0) { chunk = jis.read(b, rb, (int) size - rb); if (chunk == -1) { break; } rb += chunk; } // add to internal resource hashtable htJarContents.put(je.getName(), baos.toByteArray()); }

  Read the article

• Evaluate an expression tree

  - by Phronima

  Hi, This project that I'm working on requires that an expression tree be constructed from a string of single digit operands and operators both represented as type char. I did the implmentation and the program up to that point works fine. I'm able to print out the inorder, preorder and postorder traversals in the correct way. The last part calls for evaulating the expression tree. The parameters are an expression tree "t" and its root "root". The expression tree is ((3+2)+(6+2)) which is equal to 13. Instead I get 11 as the answer. Clearly I'm missing something here and I've done everything short of bashing my head against the desk. I would greatly appreciate it if someone can point me in the right direction. (Note that at this point I'm only testing addition and will add in the other operators when I get this method working.) public int evalExpression( LinkedBinaryTree t, BTNode root ) { if( t.isInternal( root ) ) { int x = 0, y = 0, value = 0; char operator = root.element(); if( root.getLeft() != null ) x = evalExpression(t, t.left( root ) ); if( root.getRight() != null ) y = evalExpression(t, t.right( root ) ); if( operator == '+' ) { value = value + Character.getNumericValue(x) + Character.getNumericValue(y); } return value; } else { return root.element(); } }

  Read the article

• Use of where in multiple joins to remove rows - linq

  - by bergin

  hi, I have a table of orders. the status is on the soilorders which is joined to the orders. I only want to return orders where the joined soilorder does not have status "Removed". I had thought that join sso in db.SoilSamplingOrders on ord.order_id equals sso.order_id where sso.status.Equals("Removed")!=true but then no records are returned! thanks for any help (query below) var query = from ord in db.Orders join sso in db.SoilSamplingOrders on ord.order_id equals sso.order_id where sso.status.Equals("Removed")!=true join cust in db.Customers on ord.customer_id equals cust.customer_id select new Listing { assigned_to = sso.assigned_to, company = cust.company, order_id = ord.order_id, order_created = ord.order_created, customer_id = ord.customer_id, order_created_by_employ_id = ord.order_created_by_employ_id, first_farm_on_order = (from f in db.SoilSamplingSubJobs where f.order_id == ord.order_id select new ListingSubJob { first_farm_on_order = f.farm }). AsEnumerable().First().first_farm_on_order, total_fields = (from f in db.SoilSamplingSubJobs where f.order_id == ord.order_id select new { f.sssj_id }).AsEnumerable().Count(), total_area = (float?) (from f in db.SoilSamplingSubJobs where f.order_id == ord.order_id && f.area_ha != null select f.area_ha ).Sum() ?? 0 , total_area_ph_density = (float?)(from f in db.SoilSamplingSubJobs where f.order_id == ord.order_id && f.ph != null select f.ph).Sum() ?? 0, };

  Read the article

• Rss: Bookmark is not working correctly.

  - by shruti

  I'm working on project RSS generation in MVC.Net. in taht i want to make bookmark. for that i have write the code on controller. first there is one aspx page from which subscription page gets open. public ActionResult ViewBlog() { if (Session[SessionVariables.username] == null) { return RedirectToAction("Login", "Home"); } else { return View(classObj.fetchAllBlogs()); } } and coding for subscription is: public ActionResult Rss() { string bcontent = classObj.showBlog(); DateTime postdate = classObj.showPostDate(); List<SyndicationItem> items = new SyndicationItem[] { new SyndicationItem("RSS Blog",bcontent+postdate,null), }.ToList(); RssResult r = new RssResult(); SyndicationFeed feed = new SyndicationFeed("Admin: Blog Posts", "RSS Feed",Request.Url , items); return new RssResult(feed); Developer", "The latest news on ASP.NET, C# and ASP.NET MVC "); } but problem is that when usr clicks on bookmark then intested of opening ViewBlog.aspx it opens the same page. i want to open ViewBlog.aspx. I think the problem is in: SyndicationFeed feed = new SyndicationFeed("Admin: Blog Posts", "RSS Feed",Request.Url , items); Plz help ...!

  Read the article

• Swing modal dialog refuses to close - sometimes!

  - by Zarkonnen

  // This is supposed to show a modal dialog and then hide it again. In practice, // this works about 75% of the time, and the other 25% of the time, the dialog // stays visible. // This is on Ubuntu 10.10, running: // OpenJDK Runtime Environment (IcedTea6 1.9) (6b20-1.9-0ubuntu1) // This always prints // setVisible(true) about to happen // setVisible(false) about to happen // setVisible(false) has just happened // even when the dialog stays visible. package modalproblemdemo; import java.awt.Frame; import javax.swing.JDialog; import javax.swing.SwingUtilities; public class Main { public static void main(String[] args) { final Dialogs d = new Dialogs(); new Thread() { @Override public void run() { d.show(); d.hide(); } }.start(); } static class Dialogs { final JDialog dialog; public Dialogs() { dialog = new JDialog((Frame) null, "Hello World", /*modal*/ true); dialog.setSize(400, 200); } public void show() { SwingUtilities.invokeLater(new Runnable() { public void run() { dialog.setLocationRelativeTo(null); System.out.println("setVisible(true) about to happen"); dialog.setVisible(true); }}); } public void hide() { SwingUtilities.invokeLater(new Runnable() { public void run() { System.out.println("setVisible(false) about to happen"); dialog.setVisible(false); System.out.println("setVisible(false) has just happened"); }}); } } }

  Read the article

• DLL Export C/C++ 6.00 function invoked by VB6

  - by nashth

  Hi all, I have been attemptng to create a DLL with C/C++ that can be accessed by VB6, and that's right I get error "453 Can't find DLL entry point myFunctionName in myDllName.dll" upon calling the function from a VB6 app. After searching the Web, including this site, I see that I am not alone, and I have tried the various solutions posted but error "453" is unexcapable. This is Not a COMM dll, and I believe that is possible when created via C/C++. In any case, please help, if you can. Please refer to the following simple test case below: The DLL created as a C/C++ 6.00 Win32 Dynamic-Link Library: #include // Note that I did try the line below rather than the def file, but to no avail... // #pragma comment(linker, "/EXPORT:ibask32=_ibask32@0") // Function definition extern "C" int __declspec(dllexport) __stdcall ibask32() { MessageBox(NULL,"String","Sample Code", NULL); return 0L; } The def file: LIBRARY "Gpib-32" EXPORTS ibask32 Now for the VB App: The following is the entire content of the startup Form1, Form_Load Option Explicit Private Sub Form_Load() Call ibask End Sub The following is a BAS module file that is added to the project: Option Explicit Declare Function ibask32 Lib "Gpib-32.dll" Alias "ibask" () As Long Sub ibask() Call ibask32 ' Note: This is the point of failure End Sub Thanks in advance if a workable solution can be provided, Tom

  Read the article

• Why does fb:fan control disappear after login with requireSession on external page?

  - by Max

  Hi, Reqs: I want to make an external page with a 'Become a Fan'-button. I want users to login to facebook once they open the page (this is because of other features in the site) So I call FB.Connect.requireSession once the page loads, and put a <fb:fan></fb:fan> control on the page. Then when I open the page I see the 'Connect with Facebook to Continue' pop-up and a small 'Become a fan' button. This seems right. When I log in to Facebook using the pop-up the 'Become a fan button' disappears!! Can anyone explain this weird behaviour or does someone know a way to reach my requirements in a different way. Below you can see my code. Thanks in advance! <!-- Head --> <script src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php/nl_NL" type="text/javascript"></script> <script type="text/javascript"> var fbApiKey = "MY_KEY"; var fbXdReceiver = "xd_receiver.htm"; function fbLoad() { FB.init(fbApiKey, fbXdReceiver); FB.ensureInit(function() { FB.Connect.requireSession(null, null, false); }); } </script> <!-- Body onload="fbLoad();" --> <fb:fan profile_id="24932281961" name="Nutella" id="fanButton" stream="0" connections="0" logobar="0" width="250"></fb:fan>

  Read the article

• Cost of logic in a query

  - by FrustratedWithFormsDesigner

  I have a query that looks something like this: select xmlelement("rootNode", (case when XH.ID is not null then xmlelement("xhID", XH.ID) else xmlelement("xhID", xmlattributes('true' AS "xsi:nil"), XH.ID) end), (case when XH.SER_NUM is not null then xmlelement("serialNumber", XH.SER_NUM) else xmlelement("serialNumber", xmlattributes('true' AS "xsi:nil"), XH.SER_NUM) end), /*repeat this pattern for many more columns from the same table...*/ FROM XH WHERE XH.ID = 'SOMETHINGOROTHER' It's ugly and I don't like it, and it is also the slowest executing query (there are others of similar form, but much smaller and they aren't causing any major problems - yet). Maintenance is relatively easy as this is mostly a generated query, but my concern now is for performance. I am wondering how much of an overhead there is for all of these case expressions. To see if there was any difference, I wrote another version of this query as: select xmlelement("rootNode", xmlforest(XH.ID, XH.SER_NUM,... (I know that this query does not produce exactly the same, thing, my plan was to move the logic to PL/SQL or XSL) I tried to get execution plans for both versions, but they are the same. I'm guessing that the logic does not get factored into the execution plan. My gut tells me the second version should execute faster, but I'd like some way to prove that (other than writing a PL/SQL test function with timing statements before and after the query and running that code over and over again to get a test sample). Is it possible to get a good idea of how much the case-when will cost? Also, I could write the case-when using the decode function instead. Would that perform better (than case-statements)?

  Read the article

• segmentation fault while using format string to scan input

  - by Aman Deep Gautam

  consider the code and its result: while ((row = mysql_fetch_row (table_info)) != NULL) { answer='\0'; printf ( "%s: ", row[0] ); scanf ( "%c", &answer ); getchar(); if ( answer == 'y') { printf ( "*****\n" ); table_name[index] = malloc ( strlen(row[0]) + 1 ); printf ( "*****\n" ); memcpy ( &table_name[index], &row[0], strlen(row[0]) + 1 ); } printf ( "finally inserted: %s \n", table_name[index]); } The result on execution: 1_time_access: y ***** ***** finally inserted: 1_time_access 2_time_access: y ***** ***** finally inserted: 2_time_access 39_time_access: y ***** ***** finally inserted: 39_time_access Explanation of result: row[0] has value 1_time_access, 2_time_access, 39_time_access. Now Consider a better way of doing it which is using a format string to escape the \n. I run the following code but it gives segentation fault, I cannot understand why. Code: while ((row = mysql_fetch_row (table_info)) != NULL) { answer='\0'; printf ( "%s: ", row[0] ); scanf ( "%[^\n]%*c", &answer ); if ( answer == 'y') { printf ( "*****\n" ); fflush(stdout); table_name[index] = malloc ( strlen(row[0]) + 1 ); printf ( "*****\n" ); fflush(stdout); memcpy ( &table_name[index], &row[0], strlen(row[0]) + 1 ); } printf ( "finally inserted: %s \n", table_name[index]); fflush(stdout); } Result: 1_time_access: y ***** ./set-env.sh: line 17: 15263 Segmentation fault (core dumped) ./exec dataset_one (do not worry about set-env.sh, it is the script running th program.) I canot understand why this is happening.

  Read the article

• SELECT product from subclass: How many queries do I need?

  - by Stefano

  I am building a database similar to the one described here where I have products of different type, each type with its own attributes. I report a short version for convenience product_type ============ product_type_id INT product_type_name VARCHAR product ======= product_id INT product_name VARCHAR product_type_id INT -> Foreign key to product_type.product_type_id ... (common attributes to all product) magazine ======== magazine_id INT title VARCHAR product_id INT -> Foreign key to product.product_id ... (magazine-specific attributes) web_site ======== web_site_id INT name VARCHAR product_id INT -> Foreign key to product.product_id ... (web-site specific attributes) This way I do not need to make a huge table with a column for each attribute of different product types (most of which will then be NULL) How do I SELECT a product by product.product_id and see all its attributes? Do I have to make a query first to know what type of product I am dealing with and then, through some logic, make another query to JOIN the right tables? Or is there a way to join everything together? (if, when I retrieve the information about a product_id there are a lot of NULL, it would be fine at this point). Thank you

  Read the article

• Memory optimization while downloading

  - by lboregard

  hello all i have the following piece of code, that im looking forward to optimize, since i'm consuming gobs of memory this routine is heavily used first optimization would be to move the stringbuilder construction out of the download routine and make it a field of the class, then i would clear it inside the routine can you please suggest any other optimization or point me in the direction of some resources that could help me with this (web articles, books, etc). i'm thinking about replacing the stringbuilder by a fixed (much larger) size buffer ... or perhaps create a larger sized stringbuilder thanks in advance. StreamWriter _writer; StreamReader _reader; public string Download(string msgId) { _writer.WriteLine("BODY <" + msgId + ">"); string response = _reader.ReadLine(); if (!response.StartsWith("222")) return null; bool done = false; StringBuilder body = new StringBuilder(256* 1024); do { response = _reader.ReadLine(); if (OnProgress != null) OnProgress(response.Length); if (response == ".") { done = true; } else { if (response.StartsWith("..")) response = response.Remove(0, 1); body.Append(response); body.Append("\r\n"); } } while (!done); return body.ToString(); }

  Read the article

• Why does this code leak? (simple codesnippet)

  - by Ela782

  Visual Studio shows me several leaks (a few hundred lines), in total more than a few MB. I traced it down to the following "helloWorld example". The leak disappears if I comment out the H5::DataSet.getSpace() line. #include "stdafx.h" #include <iostream> #include "cpp/H5Cpp.h" int main(int argc, char *argv[]) { _CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF ); // dump leaks at return H5::H5File myfile; try { myfile = H5::H5File("C:\\Users\\yyy\\myfile.h5", H5F_ACC_RDONLY); } catch (H5::Exception& e) { std::string msg( std::string( "Could not open HDF5 file.\n" ) + e.getCDetailMsg() ); throw msg; } H5::Group myGroup = myfile.openGroup("/so/me/group"); H5::DataSet myDS = myGroup.openDataSet("./myfloatvec"); hsize_t dims[1]; //myDS.getSpace().getSimpleExtentDims(dims, NULL); // <-- here's the leak H5::DataSpace dsp = myDS.getSpace(); // The H5::DataSpace seems to leak dsp.getSimpleExtentDims(dims, NULL); //dsp.close(); // <-- doesn't help either std::cout << "Dims: " << dims[0] << std::endl; // <-- Works as expected return 0; } Any help would be appreciated. I've been on this for hours, I hate unclean code...

  Read the article

• iOS - is it possible to cache CGContextDrawImage?

  - by woot586

  I used the timing profile tool to identify that 95% of the time is spent calling the function CGContextDrawImage. In my app there are a lot of duplicate images repeatably being chopped from a sprite map and drawn to the screen. I was wondering if it was possible to cache the output of CGContextDrawImage in an NSMutableDictionay, then if the same sprite is requested again it can be just pull it from the cache rather than doing all the work of clipping and rendering it again. This is what i’ve got but I have not been to successful: Definitions if(cache == NULL) cache = [[NSMutableDictionary alloc]init]; //Identifier based on the name of the sprite and location within the sprite. NSString* identifier = [NSString stringWithFormat:@"%@-%d",filename,frame]; Adding to cache CGRect clippedRect = CGRectMake(0, 0, clipRect.size.width, clipRect.size.height); CGContextClipToRect( context, clippedRect); //create a rect equivalent to the full size of the image //offset the rect by the X and Y we want to start the crop //from in order to cut off anything before them CGRect drawRect = CGRectMake(clipRect.origin.x * -1, clipRect.origin.y * -1, atlas.size.width, atlas.size.height); //draw the image to our clipped context using our offset rect CGContextDrawImage(context, drawRect, atlas.CGImage); [cache setValue:UIGraphicsGetImageFromCurrentImageContext() forKey:identifier]; UIGraphicsEndImageContext(); Rendering a cached sprite There is probably a better way to render CGImage which is my ultimate caching goal but at the moment I’m just looking to successfully render the cached image out however this has not been successful. UIImage* cachedImage = [cache objectForKey:identifier]; if(cachedImage){ NSLog(@"Cached %@",identifier); CGRect imageRect = CGRectMake(0, 0, cachedImage.size.width, cachedImage.size.height); if (NULL != UIGraphicsBeginImageContextWithOptions) UIGraphicsBeginImageContextWithOptions(imageRect.size, NO, 0); else UIGraphicsBeginImageContext(imageRect.size); //Use draw for now just to see if the image renders out ok CGContextDrawImage(context, imageRect, cachedImage.CGImage); UIGraphicsEndImageContext(); }

  Read the article

• Synchronize write to two collections

  - by glaz666

  I need to put some value to maps if it is not there yet. The key-value (if set) should always be in two collections (that is put should happen in two maps atomically). I have tried to implement this as follows: private final ConcurrentMap<String, Object> map1 = new ConcurrentHashMap<String, Object>(); private final ConcurrentMap<String, Object> map2 = new ConcurrentHashMap<String, Object>(); public Object putIfAbsent(String key) { Object retval = map1.get(key); if (retval == null) { synchronized (map1) { retval = map1.get(key); if (retval == null) { Object value = new Object(); //or get it somewhere synchronized (map2) { map1.put(key, value); map2.put(key, new Object()); } retval = value; } } } return retval; } public void doSomething(String key) { Object obj1 = map1.get(key); Object obj2 = map2.get(key); //do smth } Will that work fine in all cases? Thanks

  Read the article

• Compile time error: cannot convert from specific type to a generic type

  - by Water Cooler v2

  I get a compile time error with the following relevant code snippet at the line that calls NotifyObservers in the if construct. public class ExternalSystem<TEmployee, TEventArgs> : ISubject<TEventArgs> where TEmployee : Employee where TEventArgs : EmployeeEventArgs { protected List<IObserver<TEventArgs>> _observers = null; protected List<TEmployee> _employees = null; public virtual void AddNewEmployee(TEmployee employee) { if (_employees.Contains(employee) == false) { _employees.Add(employee); string message = FormatMessage("New {0} hired.", employee); if (employee is Executive) NotifyObservers(new ExecutiveEventArgs { e = employee, msg = message }); else if (employee is BuildingSecurity) NotifyObservers(new BuildingSecurityEventArgs { e = employee, msg = message }); } } public void NotifyObservers(TEventArgs args) { foreach (IObserver<TEventArgs> observer in _observers) observer.EmployeeEventHandler(this, args); } } The error I receive is: The best overloaded method match for 'ExternalSystem.NotifyObservers(TEventArgs)' has some invalid arguments. Cannot convert from 'ExecutiveEventArgs' to 'TEventArgs'. I am compiling this in C# 3.0 using Visual Studio 2008 Express Edition.

  Read the article

< Previous Page | 394 395 396 397 398 399 400 401 402 403 404 405  | Next Page >