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• In a Linux user space process what is the address of the vsyscall page?

  - by TomMD

  I would like to acquire the address of the vsyscall page for my own uses. I only have two ideas here: alter the compiler to store this information in some known location after it is given to __start, or read /proc/[pid]/maps. I really don't want to read /proc/ as that is slow and shouldn't be necessary. I also don't want to make compiler modifications. Does anyone have an alternative? Is there a symbol I should know about? Its at the point I'm tempted to stuff this functionality into an ioctl call in a module I've developed as part of this work!

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• curl cookie problem in PHP

  - by safaali

  hi as my client needs, I developed a code to login via cURl. login to www.web1.com and store cookies in cookie.txt go to www.web2.com and browse a page using that cookie.txt no problem with www.web2.com so when i want to do this with www.web3.com, the problem appears. the www.web3.com uses session and cookies itself and I have to gather and use them. it means I should have tow series of cookies, first those from www.web1.com , and second those from www.web3.com , then request the www.web3.com/somepage how I can do that?

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• Enumerable.Range in and Expression and Entity Framework

  - by eka808

  I'm currently developping an expression method (used in linq to entity queries) who has to give me a daycount for a given period (start date and end date) decrementing this daycount if specials days are in the period. My idea was the following : Generate an enumerable with all the dates (and with Enumerable.Range) Make a .Where on this enumerable to remove the specials dates Like a MyEnumerable.Where(a = a != "20120101") After that, return a MyEnumerable.Count() I come with this code : return (p) => Enumerable .Range(1, 4) .Where(a => a != 20120101) .AsQueryable() .Count() I tried to cast as a list, as a queryable, both (like the example) and no way ! it doesn't work ! I always get this error : LINQ to Entities does not recognize the method 'System.Collections.Generic.IEnumerable`1[System.Int32] Range(Int32, Int32)' method, and this method cannot be translated into a store expression. Have you got an idea about that ? Using an enumerable is of course not mandatory, any working solutions is good ^^ Thank's by advance !

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• ODBC Storage Size

  - by dcp3450

  I'm pulling a lot of text from a MS SQL Server database. I'm not getting all the text (which includes some html. The text is stored perfectly on the database. However, when I run the query to get the data It will only pull part of the text. I pull the data using odbc_exec and store using $variable = odbc_result($runquery,"body"). if i display the content with odbc_result_all($runquery) i get part of the content. if I use echo $body; i get part of the content then some garbage and part of the text from the begining. very strange response. Is there a size limit? Any ideas what I'm missing here?

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• template typename question

  - by stephenteh

  Hi, I have a problem with template and wondering is there a possible way to achieve what I wanted to do. Here is my question. template <typename T> class A { public: typedef T* pointer; typedef const pointer const_pointer; A() {} template <typename D> A(const D& d) { // how can I store the D type // so I can refer it later on // outside of this function } };

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• What's wrong with consuming ConfiguredTaskAwaitable from PortableClassLibrary's class under Debugger from MSTest Runner or Console App?

  - by Stas Shusha

  *Its only Debug-time error, but a very weird one. Problem: While running with Debugger attached and calling a method, exposed in separate Portable library, returning ConfiguredTaskAwaitable, we get InvalidProgramException. Repro: Having 2 projects: PortableClassLibrary (supporting .Net 4.5; Windows Store; Windows Phone 8) with 1 class: public class Weird { public static ConfiguredTaskAwaitable GetConfiguredTaskAwaitable() { return new ConfiguredTaskAwaitable(); } } ConsoleApplication with code: static void Main(string[] args) { Weird.GetConfiguredTaskAwaitable(); } Notes: replacing ConfiguredTaskAwaitable with ConfiguredTaskAwaitable<T> (a generic version) fixes this strange issue consuming this method form WP8 or Win8 app under Debugger works fine. Currently it causes problems cause I cant run my Unit Tests under Debugger. I'm forced to change my "ObjectUnderTest" implementation to return generic ConfiguredTaskAwaitable<T>, which is fine for the real project, but still is only a workaround. The Question is: does anybody knows the reason of this error? It definitely related to Portable Class Library magic.

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• How can I retrieve cookies for webserver A when my project is deployed on webserver B?

  - by medopal

  The project is multiple modules, each of them is deployed to a separate webserver. All of them on the same mainframe. (same IP address) I have a main menu where I login and then list all the available modules on all servers. From here I can click and go to any of them modules. I send cookies in the response (when logging in, say Server A), then on Server B (one of the modules) when I want to go back to the main menu, I check the cookies to see if the user is logged in. The problem is, Server B isn't seeing cookies generated by Server A. So each time I return to main menu, the user will be logged out. Is there anyway to store cookies to be used by multiple virtual webservers (on same IP) or any other idea?

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• iPhone App : Storing / Saving personal preferences once per App

  - by sg

  Hi, I want to store / save personal preference settings like Email, Phone number for an App. I have few forms which send info by Email to my ID. I want to know the Email & Phone number of user so I can contact this person if need be. I don't want users to keep entering their Email ID & Phone No. everytime in each form. It's wise to take these inputs (Email & Phone) just once per device / per App installed on the device. I am trying to use .plist for this purpose. I have no success. How do I do it? Any example code (or) links? Thanks. I would appreciate any help.

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• How to set datetimepicker value to only date in (.NET)

  - by salhzmzm

  Hi I have DateTimePicker on my form and I set a value to the custom format property to "dd/MM/yyyy" ant when I run this code: MessageBox.Show(dateTimePicker1.Value.ToString()); I get this value : "3/26/2010 1:26 PM". How I can remove the time part from value. I know we can use this method dateTimePicker1.Value.ToShortDateString(); but I want to set the value property to this format "dd/MM/yyyy" so the output will be like this "26/3/2010", because I want to store the value in my DB (SQL) How I can do that?

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• Best way to handle MySQL date for performance with thousands of users

  - by bitLost

  I am currently part of a team designing a site that will potentially have thousands of users who will be doing a number of date related searches. During the design phase we have been trying to determine which makes more sense for performance optimization. Should we store the datetime field as a mysql datetime. Or should be break it up into a number of fields (year, month, day, hour, minute, ...) The question is with a large data set and a potentially large set of users, would we gain performance wise breaking the datetime into multiple fields and saving on relying on mysql date functions? Or is mysql already optimized for this?

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• How to hash and salt passwords

  - by Henrik Skogmo

  I realize that this topic have been brought up sometimes, but I find myself not entirely sure on the topic just yet. What I am wondering about how do you salt a hash and work with the salted hash? If the password is encrypted with a random generated salt, how can the we verify it when the user tries to authenticate? Do we need to store the generated hash in our database as well? Is there any specific way the salt preferably should be generated? Which encryption method is favored to be used? From what I hear sha256 is quite alright. And lastly, would it be an idea to have the hash "re-salted" when the user authenticates? Thank you!

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• Basic Hibernate question using and sql query

  - by Aerosteak

  Hello Sorry if this is basic but I cannot find the solution anywhere. I have an java Object ‘Person’ with 3 properties firstname,lastname and username. I have an Oracle Store procedure returning a Resultset with the 3 column. All works fine for that. Now I have another StoreProcedure that will only return firstname and lastname but not username. I get the following error : « could not read column value from result set username. » Hibernate tries to fetch the username property from the resultset. If I remove the property username, then it works. Do I have to Create a Special Pojo for Each type of resultset or can I tell Hibernate what to map for each result set? Please help.

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• Storing and retrieving CGPoints inside NSMutableArray

  - by Matt Dice

  I've looked through countless questions on here and elsewhere and cannot for the life of me figure out what I'm doing wrong. I'm trying to store an array of CGPoints as NSValues inside of an NSMutableArray named points like so on the iPhone: NSValue *point = [NSValue valueWithCGPoint:firstTouch]; NSLog(@"NSValue *point = %@", point); [points addObject:point]; NSLOG OUTPUT NSValue *point = NSPoint: {120, 221} Everything is going smooth converting from the CGPoint to NSValue. But when I try to retrieve the point I get nothing. NSValue *getPoint = [points objectAtIndex:0]; CGPoint thePoint = [getPoint CGPointValue]; NSLog(@"Point = %@", NSStringFromCGPoint(thePoint)); NSLOG OUTPUT Point = {0, 0} The points should be the same but I'm getting a null result. For testing purposes this is happening in the touchesBegan method. Does anyone have any idea where I'm going wrong? Thanks in advance.

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• Cache an FTP connection via session variables for use via AJAX?

  - by Chad Johnson

  I'm working on a Ruby web Application that uses the Net::FTP library. One part of it allows users to interact with an FTP site via AJAX. When the user does something, and AJAX call is made, and then Ruby reconnects to the FTP server, performs an action, and outputs information. Every time the AJAX call is made, Ruby has to reconnect to the FTP server, and that's slow. Is there a way I could cache this FTP connection? I've tried caching in the session hash, but "We're sorry, but something went wrong" is displayed, and a TCP dump is outputted in my logs whenever I attempt to store it in the session hash. I haven't tried memcache yet. Any suggestions?

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• json service from data scraping with php

  - by fredz0003

  I am trying to figure out what is the best way to make this work, I am new to php. I was able to make my script work to find specific data on my htm file with the following script tested on my local server. <?php include ('simple_html_dom.php'); //create DOM from URL or local file $html = file_get_html ('Lotto Texas.htm'); //find td class name currLotWinnum and store in variable winNumbers foreach($html ->find('td.currLotWinnum') as $winNumbers) //print winNumbers echo "<b>The winning numbers are</b><br>"; echo $winNumbers -> innertext . '<br>'; ?> Need some light here, ultimately I would like to create a web service to return json format and access that data from my iOS application using NSJSONSerialization class.

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• How to step frames in a movie recorded by iPhone

  - by aron

  Is there a way to have my iPhone program step frame by frame through a movie recorded by the iPhone? What I want to do is have the user record a quicktime movie, then be able to step through the movie frame by frame. Alternately, I suppose if there was a way to extract every single frame from the movie to a jpg, then I could easily step through the pictures. Anyone know of a way to do this??? I suppose the third option (which might not get past Apple's store) is to capture the movie the way the old jailbroken apps did, which is somehow capture the pictures directly from the camera view???? Any help appreciated. Thanks in advance!!!!

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• Is it a good idea to use only a key to encrypt an entire (small) filesystem?

  - by Fernando Miguélez

  This question comes as part of my doubts presented on a broader question about ideas implementing a small encrypted filesystem on Java Mobile phones (J2ME, BlackBerry, Android). Provided the litte feedback received, considering the density of the question, I decided to divide those doubts into small questions. So to sum up I plan to "create" an encrypted filesystem for for mobile phones (with the help of BoucyCastle or a subset of JCE), providing an API that let access to them in a transparent way. Encryption would be carried out on a file basis (not blocks). My question is this: Is it a good idea to use only a simmetric key (maybe AES-256) to encrypt all the files (they wouldn't be that many, maybe tens of them) and store this key in a keystore (protected by a pin) or would you rather encrypt each file with an on-the-fly generated key stored alongside each file, encrypting that key with the "master" key stored on the keystore? What are the benefits/drawbacks of each approach?

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• .net, C# Interface between Business Logic and DAL

  - by Joel

  I'm working on a small application from scratch and using it to try to teach myself architecture and design concepts. It's a .NET 3.5, WPF application, and I'm using Sql Compact Edition as my data store. I'm working on the business logic layer, and have just now begun to write the DAL. I'm just using SqlCeComamnds to send over simple queries and SqlCeResultSet to get at the results. I'm starting to design my Insert and Update methods, and here's the issue - I don't know the best way to get the necessary data from the BLL into the DAL. Do I pass in a generic collection? Do I have a massive parameter list with all the data for the database? Do I simply pass in the actual business object (thus tying my DAL to the conrete stuff in the BLL?). I thought about using interfaces - simply passing IBusinessObjectA into the DAL, which provides the simplicity I'm looking for without tying me TOO tightly to current implementations. What do you guys think?

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• Database normalization and duplicate values

  - by bretddog

  Consider a Parent / Child / GrandChild structure in a database table schema, or even a deeper hierarchy. These being in the same aggregate. One table DAYS keeps a single row per day, and has a "Date" field. This is the root table, or maybe a child of the root. No row can ever be deleted in this table. In this case, however complex my table schema looks like, however far away in the hierarchy any other table is, is there any reason why any other table would hold a Date value? Can't it instead just have a FK to the DAYS table. I obviously assume that the creation of these date fields happen not before such datefield exist in the DAYS table. I'm now thinking just about the date part to be relevant, not the time part. Not sure if all databases can store these individually. That's maybe relevant, but not really the focus of the question.

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• Database Design Question: GUID + Natural Numbers

  - by Alan

  For a database I'm building, I've decided to use natural numbers as the primary key. I'm aware of the advantages that GUID's allow, but looking at the data, the bulk of row's data were GUID keys. I want to generate XML records from the database data, and one problem with natural numbers is that I don't want to expose my database key's to the outside world, and allow users to guess "keys." I believe GUID's solve this problem. So, I think the solution is to generate a sparse, unique iD derived from the natural ID (hopefully it would be 2-way), or just add an extra column in the database and store a guid (or some other multibyte id) The derived value is nicer because there is no storage penalty, but it would be easier to reverse and guess compared to a GUID. I'm (buy) curious as to what others on SO have done, and what insights they have.

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• Options for header in raw byte file.

  - by Tim

  I have a large raw data file (up to 1GB) which contains raw samples from a USB data logger. I need to store extra information relating to the file (sample rate, description, trigger point, last seek position etc) and was looking into adding this as a some sort of header. The header file should ideally be human readable and flexible so I've so far ruled out some sort of binary serialization into a header. I also want to avoid two separate files as they could end up separated when copied or backed up. I remembered somebody telling me that newer *.*x Microsoft Office documents are actually a number of files in a zip. Is there a simple way to achieve this? Could I still keep the quick seek times to the raw file?

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• Protect my PHP App

  - by Abs

  Hello all, I have developed an app and its written in PHP (with a bunch of SQL scripts), this app will be used by a few small companies. For them to use it, I will have to install Apache and SQL Server for them. Every method I have thought has fallen short of what I need. I was actually just hoping to use ZendGuard or IonCube but they don't support PHP 5.3.x. Is there a simpler method where I can maybe store a key in the database and make the app run only when it knows its on that server? Maybe create a key based on some random numbers/letters and the machine name, sql server host name and encode/decode this when ever the system is in use? Thanks all for any help or ideas

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• How do I dynamically define an instance variable?

  - by Moses

  Hi everyone, I have two classes (class1 and class2) that just store data, no methods. I have a third class that has an instance variable that, depending on some user input, will be set to one of the two classes. So, in the third class I declare the variable generically as NSObject *aClass; and during runtime set it to whatever it should be. aClass = [[Class1 alloc] init]; // or aClass = [[Class2 alloc] init]; However, when I try to access fields from aClass NSString *str = aClass.field1; It gives me the error: request for member 'field1' in something not a structure or a union. Field1 is declared in both class1 and class2. When I try to cast aClass aClass = (Class1 *) aClass; it gives the same error. What am I doing wrong, is there a better way to do this?

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• Creating a session user login php

  - by user2419393

  I'm stuck on how to create a session for a user who logs in. I got the part of checking to make sure the log in information corresponds with the database information, but is stuck on how to take the email address and store into a session. Here is my php code below. <?php include '../View/header.php'; session_start(); require('../model/database.php'); $email = $_POST['username']; $password = $_POST['password']; $sql = "SELECT emailAddress FROM customers WHERE emailAddress ='$email' AND password = '$password'"; $result = mysql_query($sql, $db); if (!$result) { echo "DB Error, could not query the database\n"; echo 'MySQL Error: ' . mysql_error(); exit; } while ($row = mysql_fetch_assoc($result)) { echo $row['emailAddress']; } mysql_free_result($result); ?>

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• representing graph using database

  - by prosseek

  I need to represent graph information with database. Let's say, a is connected to b, c, and d. a -- b |_ c |_ d I can have a node table for a, b, c, and d, and I can also have a link table (FROM, TO) - (a,b), (a,c), (a,d). For other implementation there might be a way to store the link info as (a,b,c,d), but the number of elements in the table is variable. Q1 : Is there a way to represent variable elements in a table? Q2 : Is there any general way to represent the graph structure using database?

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