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  • Using a class with const data members in a vector

    - by Max
    Given a class like this: class Foo { const int a; }; Is it possible to put that class in a vector? When I try, my compiler tells me it can't use the default assignment operator. I try to write my own, but googling around tells me that it's impossible to write an assignment operator for a class with const data members. One post I found said that "if you made [the data member] const that means you don't want assignment to happen in the first place." This makes sense. I've written a class with const data members, and I never intended on using assignment on it, but apparently I need assignment to put it in a vector. Is there a way around this that still preserves const-correctness?

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  • Adding new "columns" to csv data file in Tcl

    - by George
    Hi All, I am dealing with a "large" measurement data, approximately 30K key-value pairs. The measurements have number of iterations. After each iteration a datafile (non-csv) with 30K kay-value pairs is created. I want to somehow creata a csv file of form: Key1,value of iteration1,value of iteration2,... Key2,value of iteration1,value of iteration2,... Key2,value of iteration1,value of iteration2,... ... Now, I was wondering about efficient way of adding each iteration mesurement data as a columns to csv file in Tcl. So, far it seems that in either case I will need to load whole csv file into some variable(array/list) and work on each element by adding new measurement data. This seems somewhat inefficient. Is there another way, perhaps?

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  • mysql_fetch_assoc data to COOKIE in user browser

    - by Gowtham Raj
    I had data in mysql, where it does not need any security. I had a sql query string to get the data out every time using mysql_fetch_assoc. So, I planed to store data in users browser.To reduce no of quires to sql. if (!isset($_COOKIE['countries'])){ $query = "SELECT iso,name FROM sel_country"; $countries = mysql_query($query); setcookie('countries', serialize($countries), time()+3600); }else{ $countries = $unserialize($_COOKIE['countries']); } while ($row = mysql_fetch_assoc($countries)) {echo $row['name']} But, When cookie is set it is showing following error Fatal error: Function name must be a string in /home/worlds/public_html/index/ctrl.php on line 15 My cookie in browser displaying content as i%3A0%3B Please help me out, how should i go?

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  • Proper way to build a data Repository

    - by rockinthesixstring
    I'm working on using the Repository methodology in my App and I have a very fundamental question. When I build my Model, I have a Data.dbml file and then I'm putting my Repositories in the same folder with it.... IE: Data.dbml IUserRepository.cs UserRepository.cs My question is simple. Is it better to build the folder structure like that above, or is it ok to simply put my Interface in with the UserRepository.cs? Data.dbml UserRepository.cs              which contains both the interface and the class

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  • Django: Data corrupted after loading? (possible programmer error)

    - by Rosarch
    I may be loading data the wrong way. excerpt of data.json: { "pk": "1", "model": "myapp.Course", "fields": { "name": "Introduction to Web Design", "requiredFor": [9], "offeringSchool": 1, "pre_reqs": [], "offeredIn": [1, 5, 9] } }, I run python manage.py loaddata -v2 data: Installed 36 object(s) from 1 fixture(s) Then, I go to check the above object using the Django shell: >>> info = Course.objects.filter(id=1) >>> info.get().pre_reqs.all() [<Course: Intermediate Web Programming>] # WRONG! There should be no pre-reqs >>> from django.core import serializers >>> serializers.serialize("json", info) '[{"pk": 1, "model": "Apollo.course", "fields": {"pre_reqs": [11], "offeredIn": [1, 5, 9], "offeringSchool": 1, "name": "Introduction to Web Design", "requiredFor": [9]}}]' The serialized output of the model is not the same as the input that was given to loaddata. The output has a non-empty pre_req list, whereas the input's pre_reqs field is empty. What am I doing wrong?

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  • get data from gridview without querying database

    - by frank2009
    Hi there I am new at this so please bear with me... I have managed to get the following code to work...so when I click on the "select" link in each row of the gridview, the data is transfered to other label/textbox on the webpage. So far so good, the thing is that everytime I click on select...it goes and checks on the database for the data and there is a delay of a few seconds... I was hoping that the data, since it is already visible on the gridrows, is simply "picked up" and used on other labels/textboxes...without requerying the database. Is this possible ? Thanks in advance Protected Sub GridView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Label1.Text = GridView2.SelectedRow.Cells(8).Text Label2.Text = GridView2.SelectedRow.Cells(9).Text TextBox1.Text = GridView2.SelectedRow.Cells(7).Text End Sub

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  • store data in asp.net pages (Not Sessions)

    - by ARB
    I am creating 4 asp.net pages. first three pages have 'CONTINUE' button and last page has 'SUBMIT' button. I am not allowed to use Sessions to store first three pages data. and i need to use 'BACK' button on last three pages. when i click 'BACK' button i need to maintain the previous page data entered by user. As my pages do some postbacks, i cannot use javascript.history function. My restrictions are: As the application is served from a web farm, a session object cannot be used. However, for the purpose of this excersise, consider session object as database-like persistent space where you can store your data. your code should show an easy way to switch to a different persistent space. What is databse like persistent space and how to write a code to switch to different persistent space?... Please give me some idea on how to proceed.... Thank you

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  • Linq to SQL and Realtime Data

    - by Jeremy
    I have an application that needs to constantly (every 50ms), call to an MVC action, and pickup/drop off data. I am using Linq to SQL and MVC because of how simple they are to implement, and I know that they aren't perfect when it comes to performance, but it works relatively well, but the best speed I can get with my current approach is 200ms (without requests overlapping). Each call to the site will create a new instance of the datacontext, query/insert it and return that data. Is there a way to have the datacontext static, but submitchanges say every 5 seconds, so that i am pretty much hitting an in-memory version of the data?

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  • Is it possible to get RSA private key knowing public key and set of "original data=>encrypted data"

    - by Riz
    Hi, I work on apllication which allows plugins to access different set of functionality, every plugin provides "initialization string" which sets level of access to different features. Developers send me this strings, and I encrypt them using my 1024 bit RSA private key and send encoded data back. When started, my application decodes encoded data(encoded initialisation string) using built-in public key and if "decoded data != initialization string" it fails to start. So, is it possible to use a database of "initialization string" = "encoded initialization string"(extracted from other plugins) to crack my private key, or make it possible to bruteforce it in reasonable time?

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  • what changes when your input is giga/terabyte sized?

    - by Wang
    I just took my first baby step today into real scientific computing today when I was shown a data set where the smallest file is 48000 fields by 1600 rows (haplotypes for several people, for chromosome 22). And this is considered tiny. I write Python, so I've spent the last few hours reading about HDF5, and Numpy, and PyTable, but I still feel like I'm not really grokking what a terabyte-sized data set actually means for me as a programmer. For example, someone pointed out that with larger data sets, it becomes impossible to read the whole thing into memory, not because the machine has insufficient RAM, but because the architecture has insufficient address space! It blew my mind. What other assumptions have I been relying in the classroom that just don't work with input this big? What kinds of things do I need to start doing or thinking about differently? (This doesn't have to be Python specific.)

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  • Request for the permission of type 'System.Data.SqlClient.SqlClientPermission failed

    - by Richmond
    Hi All! I have asp.net application, using LINQ to connecto to SQL Server 2008 R2 databse. My connection string: Data Source=[SqlServerIp];Initial Catalog=[databaseName]User Id=newLogin;Password=newPassword; When I deploy application on my local IIS (which is not the same machine as database server) it works fine, but when I deploy application on other IIS (the same machine as sqlServer) it throws an exception: System.Security.SecurityException: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. Anyone knows how to fix it? Maybe it is due to some bad configuration of IIS? Please help.

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  • How to efficiently deal with a large amount of HTML5 canvas pixel data over websockets

    - by user730569
    Using imageData = context.getImageData(0, 0, width, height); JSON.stringify(imageData.data); I grab the pixel data, convert it to a string, and then send it over the wire via websockets. However, this string can be pretty large, depending on the size of the canvas object. I tried using the compression technique found here: JavaScript implementation of Gzip but socket.io throws the error Websocket message contains invalid character(s). Is there an effective way to compress this data so that it can be sent over websockets?

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  • Iterate over a list and put data in hashmap

    - by sarah
    I am having a list where i need to loop over it and put its data in hashmap,i am using this approach for(int i=0;i<list.size();i++) { HashMap hMap=new HashMap(); hMap.put("Data", list); } But when i need to read the value from hMap i am doing in this way Collection c = hMap.values(); Iterator itr = c.iterator(); while(itr.hasNext()) { System.out.println("next val is--"+itr.next()); } next vali is--- is printed in com.bean.xyz@23032bc[id=1] format ,i need the exact data,how will i do this ?

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  • Declaring a data type dynamically in C++

    - by Bobby
    I want to be able to do the following: I have an array of strings that contain data types: string DataTypeValues[20] = {"char", "unsigned char", "short", "int"}; Then later, I would like to create a variable of one of the data types at runtime. I won't know at compile time what the correct data type should be. So for example, if at runtime I determined a variable x needed to be of type int: DataTypeValues[3] x = 100; Obviously this won't work, so how could I do something like this?

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  • Accessing 'data' argument of with() function?

    - by Ken Williams
    Is it possible, in the expr expression of the with() function, to access the data argument directly? Here's what I mean conceptually: > print(df) result qid f1 f2 f3 -1 1 0.0000 0.1253 0.0000 -1 1 0.0098 0.0000 0.0000 1 1 0.0000 0.0000 0.1941 -1 2 0.0000 0.2863 0.0948 1 2 0.0000 0.0000 0.0000 1 2 0.0000 0.7282 0.9087 > with(df, subset(.data, select=f1:f3)) # Doesn't work Of course the above example is kind of silly, but it would be handy for things like this: with(subset(df, f2>0), foo(qid, vars=subset(.data, select=f1:f3))) I tried to poke around with environment() and parent.frame() etc., but didn't come up with anything that worked. Maybe this is really a question about eval(), since that's how with.default() is implemented.

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  • Saving data in a inherited django model

    - by aldeano
    I'm building an app to save data and some calculations made with those datas, the idea is keep the data in one model and the calculations in other. So, the models are like this: class FreshData(models.Model): name = models.CharField(max_length=20) one = models.IntegerField() two = models.IntegerField() def save(self, *args, **kwargs): Calculations() Calculations.three = self.one + self.two super(FreshData, self).save(*args, **kwargs) Calculations.save() class Calculations(FreshData): three = models.IntegerField() I've got a valueerror pointing out "self.one" and "self.two" as without value. I keep the idea in witch my design is wrong and django has a simpler way to store related data.

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  • Cakephp: Access data in add function

    - by Chris
    I'm using the CakePHP blog example: function add() { if (!empty($this->data)) { if ($this->Post->saveAll($this->data)) { $this->Session->setFlash('Your post has been saved.'); $this->redirect(array('action' => 'index')); } }} I want to modify it in a way that the user is redirected to the post after adding it: But this doesn't work: $this->redirect(array('action' => 'view', $this->Post->id))); What is the correct way to read the model's data after creation?

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  • How should my main web application (A) securely retrieve data from my content storage web applicatio

    - by fonacule
    I have two web applications (A) and (B). (A) is my primary web application. (B) is purely for content storage, such as file uploads by users of (A). What's best way to securely retrieve data from (B) into (A) but in a way that does not expose the data in (B) to potential discovery by third-parties over the public internet or nosy users of (A)? For example, if I use a HTML form POST from (A) to (B) to retrieve user data, and have a hidden form field called user_id=1, then someone could simply change this to user_id=2 and see the content owned by another user of the application. That would be a problem.

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  • Java-Recursion: When does statements after a recursive method call executes

    - by Ruru Morlano
    When are statements after the method call itself going to execute? private void inorderHelper(TreeNode node) { if ( node==null ) return; inorderHelper(node.leftNode); System.out.printf("%d", node.data); inorderHelper(node.rigthNode); } All I can see is that the line of codes inorderHelper(node.leftNode) will continue to iterate until node == null and the method terminates immediately before node.data is printed. I think that I didn't get well recursion but all examples I can find doesn't have statements after the recursive call. All I want to know is when are statements like System.out.printf("%d",node.data) going to execute before the method return?

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  • Widget_Controller for different types of data (MVC)

    - by steve-o
    Hello, I have a few widgets I need to show on a site - they are all relating to different types of data (e.g user, house). Each type of data and its relations is represented in specific models, but as far as a controller or helper is concerned, is it an ok plan to have a generic Widget controller/helper which generates the necessary widgets, even though each widget is dealing with distinct data? I don't really want to generate these widgets within the User and House controllers, as these controllers are dealing with different types of functionality. I'd imagine that the Widget_Controller could just contain static methods for generating these widgets, e.g: Widget_Controller::user_panel(); Does that make sense? Cheers!

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  • Interpolation on Cubism graphs

    - by Abe Stanway
    Cubism was designed, by mbostock's own words, for maximum information density - which means it generally wants to display one datapoint per pixel. While this is useful in many cases, it doesn't help when your data itself is not that dense. In these cases, you get ugly, staccato-style graphs like so: Is there a way to interpolate my data/graph within Cubism to show a nice, smoothed graph? EDIT: After adding keepLastValue to the metric, I get this: Here is the same data as shown in Graphite: I would like to smooth the Cubism view to look more like Graphite (with the added awesomeness of the horizon overplotting)

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  • How to add data to a dictonary in c#

    - by Pramodh
    Dear all, How to add data to dictonary from xml fil scenerio: I've declared a dictonary like Dictonary<string,string> SampleDict=new Dictonary<string,string>(); and my xml file is like <Data> <Element ValOne="1" ValTwo="0" /> <Element ValOne="2" ValTwo="2" /> <Element ValOne="3" ValTwo="4" /> <Element ValOne="4" ValTwo="6" /> <Element ValOne="5" ValTwo="8" /> <Element ValOne="6" ValTwo="10" /> <Element ValOne="7" ValTwo="12" /> <Element ValOne="8" ValTwo="14" /> <Element ValOne="9" ValTwo="16" /> <Element ValOne="10" ValTwo="18" /> </Data> i need to read the value of "ValOne" and "ValTwo" using LINQ and insert the same into the above declared dictonary Please help me to do this Thanks in advance

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  • Contacts activity doesn't return data

    - by Mike
    In my app I simply open the list of activities and when a contact is clicked I attempt to retrieve the name of the contact selected and put it into a string. The app crashes in the onActivityResult() function. I do have the READ_CONTACTS permission set. /** * Opens the contacts activity */ public void openContacts() { Intent intent = new Intent(Intent.ACTION_PICK, People.CONTENT_URI); startActivityForResult(intent, PICK_CONTACT); } @Override public void onActivityResult(int reqCode, int resultCode, Intent data) { super.onActivityResult(reqCode, resultCode, data); switch (reqCode) { case (PICK_CONTACT) : if (resultCode == Activity.RESULT_OK) { Uri contactData = data.getData(); Cursor c = managedQuery(contactData, null, null, null, null); //NullPointerException thrown here, line 102 if (c.moveToFirst()) { String name = c.getString(c.getColumnIndexOrThrow(People.NAME)); FRIEND_NAME = name; showConfirmDialog(name); } } break; } } The following logcat error logs are returned: Any help is appreciated. Thanks

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  • sql data source re binding question

    - by Keith
    In my gridview after an insert operation has been done I am filtering the sqldatasource by ID. I am getting an error that the item drop down box selected value is not in the list. To test my theory I created a new sql data source with only the select statement and after the insert operation I am binding it to my grid view and filtering by Id and I get my result. The question Having a second data source is not the solution so is it possible that there is some way to use sqldatasource1? what I tried is sqldatasource.databind() and gridview.databind() on the inserted and inserting metheds in many test cases but still that doesnt work. I dont have any filters applied on the original data source?

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  • Jquery can't get form data in opera

    - by Rick de Graaf
    I can't understand why in Opera and IE the following code does not work... $("#form_" + $(this).attr('id')).serialize(); I checked it by only getting the attribute; worked I checked if I could get the form data without serialize; worked How should I code this? Tried a lot of combinations and stuff but nothing works.. why does this isn't working in opera? In chrome I have no problems... To answer some of the questions below I have multiple forms on my page, each with an unique id (from_1, form_5 etc.) I checked this and is correct. The form data needs to be fetched when a select changes, so data call is fired by an change event.

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