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• Are there any decent free JAVA data plotting libraries out there?

  - by Kurt W. Leucht

  On a recent JAVA project, we needed a free JAVA based real-time data plotting utility. After much searching, we found this tool called the Scientific Graphics Toolkit or SGT from NOAA. It seemed pretty robust, but we found out that it wasn't terribly configurable. Or at least not configurable enough to meet our needs. We ended up digging very deeply into the JAVA code and reverse engineering the code and changing it all around to make the plot tool look and act the way we wanted it to look and act. Of course, this killed any chance for future upgrades from NOAA. So what free or cheap JAVA based data plotting tools or libraries do you use? Followup: Thanks for the JFreeChart suggestions. I checked out their website and it looks like a very nice data charting and plotting utility. I should have made it clear in my original question that I was looking specifically to plot real-time data. I corrected my question above to make that point clear. It appears that JFreeChart support for live data is marginal at best, though. Any other suggestions out there?

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• How to encrypt an NSString in Objective C with DES in ECB-Mode?

  - by blauesocke

  Hi, I am trying to encrypt an NSString in Objective C on the iPhone. At least I wan't to get a string like "TmsbDaNG64lI8wC6NLhXOGvfu2IjLGuEwc0CzoSHnrs=" when I encode "us=foo;pw=bar;pwAlg=false;" by using this key: "testtest". My problem for now is, that CCCrypt always returns "4300 - Parameter error" and I have no more idea why. This is my code (the result of 5 hours google and try'n'error): NSString *token = @"us=foo;pw=bar;pwAlg=false;"; NSString *key = @"testtest"; const void *vplainText; size_t plainTextBufferSize; plainTextBufferSize = [token length]; vplainText = (const void *) [token UTF8String]; CCCryptorStatus ccStatus; uint8_t *bufferPtr = NULL; size_t bufferPtrSize = 0; size_t *movedBytes; bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1); bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t)); memset((void *)bufferPtr, 0x0, bufferPtrSize); // memset((void *) iv, 0x0, (size_t) sizeof(iv)); NSString *initVec = @"init Vec"; const void *vkey = (const void *) [key UTF8String]; const void *vinitVec = (const void *) [initVec UTF8String]; ccStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES, kCCOptionECBMode, vkey, //"123456789012345678901234", //key kCCKeySizeDES, NULL,// vinitVec, //"init Vec", //iv, vplainText, //"Your Name", //plainText, plainTextBufferSize, (void *)bufferPtr, bufferPtrSize, movedBytes); NSString *result; NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes]; result = [myData base64Encoding];

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• Change find method in database search so that it isn't case sensitive in Rails app

  - by Ryan

  Hello, I am learning Rails and have created a work-in-progress app that does one-word searches on a database of shortcut keys for various programs (http://keyboardcuts.heroku.com/shortcuts/home). The search method in the Shortcut model is the following: def self.search(search) search_condition = "%" + search + "%" find(:all, :conditions => ['action LIKE ? OR application LIKE ?', search_condition, search_condition]) end ...where 'action' and 'application' are columns in a SQLite table. (source: https://we.riseup.net/rails/simple-search-tutorial) For some reason, the search seems to be case sensitive (you can see this by searching 'Paste' vs. 'paste'). Can anyone help me figure out why and what I can do to make it not case sensitive? If not, can you at least point me in the right direction? Database creation: I first copied shortcuts from various website into Excel and saved it as a CSV. Then I migrated the database and filled it with the data using db:seed and a small script I wrote (I viewed the database and it looked fine). To get the SQLite database to the server, I used Taps as outline by the Heroku website (http://blog.heroku.com/archives/2009/3/18/push_and_pull_databases_to_and_from_heroku/). I am using Ubuntu. Please let me know if you need more information. Thanks in advance for you help, very much appreciated! Ryan

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• VS2008 EF and non crud SP usage.

  - by SteveO

  Using an edmx version of EF. My returned data is a join between tables that has a COMPOUND filter on the primary table. In essence this query is going to return a SEGMENT of Law codes and descriptions that a user can tie to a Sex Offender report. I have a complex SP because Linq2SQL cannot pass in a between statement, or at least that is how I understand the error. The Code itself is broken up by '-' marks. 39-13-504 "Aggravated Sexual Battery" User wants to have a query with 4 parmas 39, 13, 500, 599. Get all codes from Title 39 and Chapter 13 with parts between 500 and 599. I have the SP in place to do the work, is there are way to consume the SP within the EF? I find many blogs about SPs with CRUD operations as their use of an SP. That doesn't fit this need at all. I do not have a single table but a join to the "prior selections" table that maps the key for the code. Any pointers on how to get a READ with an SP? TIA

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• Classic ASP Session not working in IIS 7 Windows Server 2008 R2 x64

  - by user553361

  Hi, I've been googleing and searching here info about this but so far couldn't find anything relevant to my problem. We have a website currently working on II6 and Windows Server 2003 (x86) without any problem. Now we want to migrate our server to a Virtual Machine with Windows Server 2008 R2 (x64) and IIS7. Out current app is built in Classic ASP and SQL Server (This one located on a 2nd Server but this is staying the way it is now). The website is configured as a WebSite, not a virtual directory. Using DefaultAppPool with 4 applications. Now, the problem I'm getting is with the Sessions, or at least that's what I think since I created a simple hello.asp with this code <% response.write "Hello" response.write Session.SessionID %> And this is giving us this result: Hello error '8002801d' /hello.asp, line 3 ASP Sessions Properties Enable Session State : True Maximum Sessions : 2147483647 New ID On Secure Connection : True Time-out : 20 min This is the log in Event Viewer Warning 24/12/2010 14:03:42 Active Server Pages 9 None FailedReqLog Url http://apps.shocklogic.com:80/hello.asp App Pool DefaultAppPool Authentication anonymous User from token NT AUTHORITY\IUSR Activity ID {00000000-0000-0000-1400-0080000000F8} Site 1 Process 3312 Failure Reason STATUS_CODE Trigger Status 500 Final Status 500 Time Taken 110 msec Would be great if anyone has any ideas. Thanks, Federico

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• Large scale storage for incrementally-appended documents?

  - by Ben Dilts

  I need to store hundreds of thousands (right now, potentially many millions) of documents that start out empty and are appended to frequently, but never updated otherwise or deleted. These documents are not interrelated in any way, and just need to be accessed by some unique ID. Read accesses are some subset of the document, which almost always starts midway through at some indexed location (e.g. "document #4324319, save #53 to the end"). These documents start very small, at several KB. They typically reach a final size around 500KB, but many reach 10MB or more. I'm currently using MySQL (InnoDB) to store these documents. Each of the incremental saves is just dumped into one big table with the document ID it belongs to, so reading part of a document looks like "select * from saves where document_id=14 and save_id 53 order by save_id", then manually concatenating it all together in code. Ideally, I'd like the storage solution to be easily horizontally scalable, with redundancy across servers (e.g. each document stored on at least 3 nodes) with easy recovery of crashed servers. I've looked at CouchDB and MongoDB as possible replacements for MySQL, but I'm not sure that either of them make a whole lot of sense for this particular application, though I'm open to being convinced. Any input on a good storage solution?

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• Problem with DOMPDF and Kohana 3

  - by alex

  I have used DOMPDF many times before successfully, however outside of the Kohana Framework. I created a module for DOMPDF and called it simply pdf. Here is it's code. class Pdf { private $domPdfInstance; public function __construct($html) { if ( ! class_exists('DOMPDF', FALSE)) { // Load DOMPDF require Kohana::find_file('vendor', 'dompdf/dompdf_config.inc'); } $this->domPdfInstance = new DOMPDF; $this->domPdfInstance->load_html($html); } public function render() { $this->domPdfInstance->render(); return $this; } public function stream($filename) { if (pathinfo($filename, PATHINFO_EXTENSION) !== 'pdf') { $filename .= '.pdf'; } $this->domPdfInstance->stream($filename); return $this; } } For some reason, any PDF I generate using this results in it being corrupt (not opening under Mac OS X's Preview app at least). I have even tried this basic HTML <html> <head> <title>PDF</title> </head> <body> please work </body> </html> Is this a known problem? I have not touched anything in dompdf_config.inc.php except uncomment out the error reporting levels so they now read error_reporting(E_STRICT | E_ALL); PHP is not reporting any errors. Here is a screenshot of the error from Preview (though I think it's probably unhelpful) Some thing I have thought may be a problem Auto loading conflicts Base path conflicts

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• Read binary file into a struct C#

  - by Robert Höglund

  I'm trying to read binary data using C#. I have all information about the layout of the data in the files I want to read. I'm able to read the data "chunk by chunk", i.e. getting the first 40 bytes of data converting it to a string, get the next 40 bytes, ... Since there are at least three slighlty different version of the data, I would like to read the data directly into a struct. It just feels so much more right than by reading it "line by line". I have tried the following approach but to no avail:StructType aStruct; int count = Marshal.SizeOf(typeof(StructType)); byte[] readBuffer = new byte[count]; BinaryReader reader = new BinaryReader(stream); readBuffer = reader.ReadBytes(count); GCHandle handle = GCHandle.Alloc(readBuffer, GCHandleType.Pinned); aStruct = (StructType) Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(StructType)); handle.Free(); The stream is an opened FileStream from which I have began to read from. I get an AccessViolationException when using Marshal.PtrToStructure. The stream contains more information than I'm trying to read since I'm not interested in data at the end of the file. The struct is defined like:[StructLayout(LayoutKind.Explicit)] struct StructType { [FieldOffset(0)] public string FileDate; [FieldOffset(8)] public string FileTime; [FieldOffset(16)] public int Id1; [FieldOffset(20)] public string Id2; } The examples code is changed from original to make this question shorter. How would I read binary data from a file into a struct?

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• How do I get google protocol buffer messages over a socket connection without disconnecting the clie

  - by Dan

  Hi there, I'm attempting to send a .proto message from an iPhone application to a Java server via a socket connection. However so far I'm running into an issue when it comes to the server receiving the data; it only seems to process it after the client connection has been terminated. This points to me that the data is getting sent, but the server is keeping its inputstream open and waiting for more data. Would anyone know how I might go about solving this? The current code (or at least the relevant parts) is as follows: iPhone: Person *person = [[[[Person builder] setId:1] setName:@"Bob"] build]; RequestWrapper *request = [[[RequestWrapper builder] setPerson:person] build]; NSData *data = [request data]; AsyncSocket *socket = [[AsyncSocket alloc] initWithDelegate:self]; if (![socket connectToHost:@"192.168.0.6" onPort:6666 error:nil]){ [self updateLabel:@"Problem connecting to socket!"]; } else { [self updateLabel:@"Sending data to server..."]; [socket writeData:data withTimeout:-1 tag:0]; [self updateLabel:@"Data sent, disconnecting"]; //[socket disconnect]; } Java: try { RequestWrapper wrapper = RequestWrapper.parseFrom(socket.getInputStream()); Person person = wrapper.getPerson(); if (person != null) { System.out.println("Persons name is " + person.getName()); socket.close(); } On running this, it seems to hang on the line where the RequestWrapper is processing the inputStream. I did try replacing the socket writedata method with [request writeToOutputStream:[socket getCFWriteStream]]; Which I thought might work, however I get an error claiming that the "Protocol message contained an invalid tag (zero)". I'm fairly certain that it doesn't contain an invalid tag as the message works when sending it via the writedata method. Any help on the matter would be greatly appreciated! Cheers! Dan (EDIT: I should mention, I am using the metasyntactic gpb code; and the cocoaasyncsocket implementation)

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• How to debug a web service written in PHP?

  - by nightcoder

  Hello, I've got a nice question here :) I need to debug my web service written in PHP. Its client is written in C#. After a couple of days of searching I realized this is not an easy task. At least it seems nobody knows the right solution. What is the problem in, actually? We have 2 popular PHP debugging libraries : PHP Debugger from NuSphere and XDebug extension. The problem is they both are controlled from URL query string or with the help of cookies. For example, to enable debugging with PHP Debugger you need to add ?DBGSESSID=xxx parameter to your URL or to have DBGSESSID cookie. But when your web service is called from the external client, the client doesn't have a cookie and doesn't add DBGSESSID url parameter. So how can we debug in this situation? PS. I don't want to write to log files, see request and response headers/data or something like this. I want normal step-by-step debugging and breakpoints. Anyone?

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• Enum "does not have a no-arg default constructor" with Jaxb and cxf

  - by Dave

  A client is having an issue running java2ws on some of their code, which uses & extends classes that are consumed from my SOAP web services. Confused yet? :) I'm exposing a SOAP web service (JBoss5, Java 6). Someone is consuming that web service with Axis1 and creating a jar out of it with the data types and client stubs. They are then defining their own type, which extends one of my types. My type contains an enumeration. class MyParent { private MyEnumType myEnum; // getters, settters for myEnum; } class TheirChild extends MyParent { ... } When they are running java2ws on their code (which extends my class), they get Caused by: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions net.foo.bar.MyEnuMType does not have a no-arg default constructor. this problem is related to the following location: at net.foo.bar.MyEnumType at public net.foo.bar.MyEnumType net.foo.bar.MyParent.getMyEnum() The enum I've defined is below. This is now how it comes out after being consumed, but it's how I have it defined on the app server: @XmlType(name = "MyEnumType") @XmlEnum public enum MyEnumType { Val1("Val1"), Val2("Val2") private final String value; MyEnumType(String v) { value = v; } public String value() { return value; } public static MyEnumType fromValue(String v) { if (v == null || v.length() == 0) { return null; } if (v.equals("Val1")) { return MyEnumType.Val1; } if (v.equals("Val2")) { return MyEnumType.Val2; } return null; } } I've seen things online and other posts, like (this one) regarding Jaxb's inability to handle Lists or things like that, but I'm baffled about my enum. I'm pretty sure you can't have a default constructor for an enum (well, at least a public no-arg constructor, Java yells at me when I try), so I'm not sure what makes this error possible. Any ideas? Also, the "2 counts of IllegalAnnotationsExceptions" may be because my code actually has two enums that are written similarly, but I left them out of this example for brevity.

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• String.Empty in strings, need some explanation if possible :)

  - by Pabuc

  Hello all, 2 days ago, there was a question related to string.LastIndexOf(String.Empty) returning the last index of string. So I thought that; a string can always contain string.empty between characters like: "testing" == "t" + String.Empty + "e" + String.Empty +"sting" + String.Empty; After this, I wanted to test if String.IndexOf(String.Empty) was returning 0 because since String.Empty can be between any char in a string, that would be what I expect it to return and I wasn't wrong. string testString = "testing"; int index = testString.LastIndexOf(string.Empty); // index is 6 index = testString.IndexOf(string.Empty); // index is 0 It actually returned 0. I started to think that if I could split a string with String.Empty, I would get at least 2 string and those would be String.Empty and rest of the string since String.IndexOf(String.Empty) returned 0 and String.LastIndexOf(String.Empty) returned length of the string.. Here is what I coded: string emptyString = string.Empty; char[] emptyStringCharArr = emptyString.ToCharArray(); string myDummyString = "abcdefg"; string[] result = myDummyString.Split(emptyStringCharArr); The problem here is, I can't obviously convert String.Empty to char[] and result in an empty string[]. I would really love to see the result of this operation and the reason behind this. So my questions are: Is there any way to split a string with String.Empty? If it is not possible but in an absolute world which it would be possible, would it return an array full of chars like [0] = "t" [1] = "e" [2] = "s" and so on or would it just return the complete string? Which would make more sense and why? Thank you for your time.

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• How to deal with special characters in ASP.NET's HyperLink.NavigateUrl?

  - by DJ Pirtu

  I am currently having troubles figuring out how to handle a filepath to be (dynamicly) passed out to a HyperLink control's NavigateUrl property. Let's say that I'm trying to refer to a file named jäynä.txt at the root of C:. Passing "file:///C:/jäynä.txt" result to a link to file:///C:/jäynä.txt, as does HttpUtility.UrlPathEncode("file:///C:/jäynä.txt"). Replacing the äs with %E4, which gives the string "file:///C:/j%E4yn%E4.txt", does give a working link to file:///C:/jäynä.txt, but I have not been able to find a way to make the replacement without defining it myself. With Replace("ä", "%E4"), for example. Is there a way to automaticly handle the filepath string so that the HyperLink would display it correctly, without manualy listing what characters to replace in the string? Additional Note: There may be a way to work around this by spesifying the character encoding in which the page is rendered, because debugging shows that the HyperLink at least saves the string "file:///C:/jäynä.txt" unchanged, but somehow mangles it around the time of rendering. However, this seems only be the case in rendering of the NavigateUrl because other components as well as HyperLink's Text-property are all quite capable of rendering the character ä unchanged.

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• help in the Donalds B. Johnson's algorithm, i cannot understand the pseudo code (PART II)

  - by Pitelk

  Hi all , i cannot understand a certain part of the paper published by Donald Johnson about finding cycles (Circuits) in a graph. More specific i cannot understand what is the matrix Ak which is mentioned in the following line of the pseudo code : Ak:=adjacency structure of strong component K with least vertex in subgraph of G induced by {s,s+1,....n}; to make things worse some lines after is mentins " for i in Vk do " without declaring what the Vk is... As far i have understand we have the following: 1) in general, a strong component is a sub-graph of a graph, in which for every node of this sub-graph there is a path to any node of the sub-graph (in other words you can access any node of the sub-graph from any other node of the sub-graph) 2) a sub-graph induced by a list of nodes is a graph containing all these nodes plus all the edges connecting these nodes. in paper the mathematical definition is " F is a subgraph of G induced by W if W is subset of V and F = (W,{u,y)|u,y in W and (u,y) in E)}) where u,y are edges , E is the set of all the edges in the graph, W is a set of nodes. 3)in the code implementation the nodes are named by integer numbers 1 ... n. 4) I suspect that the Vk is the set of nodes of the strong component K. now to the question. Lets say we have a graph G= (V,E) with V = {1,2,3,4,5,6,7,8,9} which it can be divided into 3 strong components the SC1 = {1,4,7,8} SC2= {2,3,9} SC3 = {5,6} (and their edges) Can anybody give me an example for s =1, s= 2, s= 5 what if going to be the Vk and Ak according to the code? The pseudo code is in my previous question in http://stackoverflow.com/questions/2908575/help-in-the-donalds-b-johnsons-algorithm-i-cannot-understand-the-pseudo-code and the paper can be found at http://stackoverflow.com/questions/2908575/help-in-the-donalds-b-johnsons-algorithm-i-cannot-understand-the-pseudo-code thank you in advance

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• SelectMany in Linq to entity

  - by Brazeta

  I was looking at some examples in microsoft site about linq and I see an example that I need to modify! http://msdn.microsoft.com/en-us/vcsharp/aa336758.aspx#SelectManyCompoundfrom3 public void Linq16() { List customers = GetCustomerList(); var orders = from c in customers from o in c.Orders where o.OrderDate >= new DateTime(1998, 1, 1) select new { c.CustomerID, o.OrderID, o.OrderDate }; ObjectDumper.Write(orders); } Insted of having a select that retrives the CustomerID, OrderID and OrderDate I want to select the CustomerID and a System.Collection.Generic.List that contains all the orders for that user! Essentially I want to group my orders by CustomerID, but i noticed that linq to entity does not allow a .ToList(object) inside the select. I want something like this... List customers = GetCustomerList(); var orders = from c in customers from o in c.Orders where o.OrderDate >= new DateTime(1998, 1, 1) select new xpto { TheCostumerID = c.CustomerID, CostumerOrders = o.Select(i=>i.OrderID).ToList(), }; ...but the .ToList() is a big problem, at least for me. I'm trying to find out the solution for that but so far I have acomplished nothing! Please help me.

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• To GAC, or not to GAC?

  - by Jagd

  I have a data access layer (DAL) that is written in ASP.NET 3.5 and uses the Microsoft patterns & practices libraries (hereafter referred to as P&P) in order to accomplish its data access. I installed P&P and it resides in my GAC, so, logically, my DAL references it in the GAC. Therefore, the P&P libraries are never pulled down to the bin folder of my DAL. I use this DAL project in at least five (more than that even, but I'm too lazy to try to count them all) different websites. And this has all worked just fine for me because I'm the only developer who works on these websites. But, now I have other developers who are going to work on some of these websites. The problem: if a developer pulls the DAL project down from our code repository, it won't build for them if they don't have the P&P libraries installed. My question: should I expect the developers to install the P&P libraries, or should I just dump them in the bin folder and be done with it? I realize that dumping them into the bin folder is probably the easiest way to deal with the problem, but I've never been a big fan of the bin folder if I can reference them in the GAC instead.

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• jQuery Validation Plugin: Validating Checkboxes with Different Names

  - by Michael

  I have a set of 4 checkboxes, all with different names, and require that at least 1 is checked. I know there are a few posts on here already trying to answer this question. The solution that seems to be most logical to me is the answer posted on Question 1734840, but I can't seem to get it working! What's wrong with my code? Or any other new coding ideas to get this working? I have set the class on all of them to 'require-one'. My jQuery code is $(document).ready(function(){ $("#itemForm").validate({ highlight: function(element, errorClass, validClass) { $(element).addClass(errorClass).removeClass(validClass); $(element.form).find("label[for=" + element.name + "]") .addClass("radioerror"); }, unhighlight: function(element, errorClass, validClass) { $(element).removeClass(errorClass).addClass(validClass); $(element.form).find("label[for=" + element.name + "]") .removeClass("radioerror"); }, rules: { 'require-one': { required : { depends: function(element) { var allBoxes = $('.require-one'); if (allBoxes.filter(':checked').length == 0) { if (allBoxes.eq(element).length != 0) { return true; } } return false; } } } , }, errorPlacement: function(error, element) { if ( element.is("#other_descrip") ) error.appendTo("#othererror" ); if ( element.is("#itemlist") ) error.appendTo("#itemerror" ); } }); });

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• MVC2 and jquery.validate.js

  - by Will I Am

  I am experiencing some confusion with jquery.validate.js First of all, what is MicrosoftMvcJqueryValidation.js. It is referenced in snippets on the web but appears to have dissapeared from the RTM MVC2 and is now in futures. Do I need it? The reason I'm asking is that I'm trying to use the validator with MVC and I can't get it to work. I defined my JS as: $(document).ready(function () { $("#myForm").validate({ rules: { f_fullname: { required: true }, f_email: { required: true, email: true }, f_email_c: { equalTo: "#f_email" }, f_password: { required: true, minlength: 6 }, f_password_c: { equalTo: "#f_password" } }, messages: { f_fullname: { required: "* required" }, f_email: { required: "* required", email: "* not a valid email address" }, f_email_c: { equalTo: "* does not match the other email" }, f_password: { required: "* required", minlength: "password must be at least 6 characters long" }, f_password_c: { equalTo: "* does not match the other email" } } }); }); and my form on the view: <% using (Html.BeginForm("CreateNew", "Account", FormMethod.Post, new { id = "myForm" })) { %> <fieldset> <label for="f_fullname">name:</label><input id="f_fullname"/> <label for="f_email"><input id="f_email"/> ...etc... <input type="submit" value="Create" id="f_submit"/> </fieldset> <% } %> and the validation method gets called on .ready() with no errors in firebug. however when I submit the form, nothing gets validated and the form gets submitted. If I create a submitHandler() it gets called, but the plugin doesn't detect any validation errors (.valid() == true) What am I missing?

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• Design patter to keep track UITableView rows correspondance to underlying data in constant time.

  - by DenNukem

  When my model changes I want to animate changes in UITableView by inserting/deleting rows. For that I need to know the ordinal of the given row (so I can construct NSIndexPath), which I find hard to do in better-than-linear time. For example, consider that I have a list of addressbook entries which are manualy sorted by the user, i.e. there is no ordering "key" that represents the sort order. There is also a corresponding UITableView that shows one row per addressbook entry. When UITableView queries the datasource I query the NSMUtableArray populated with my entries and return required data in constant time for each row. However, if there is a change in underlying model I am getting a notification "Joe Smith, id#123 has been removed". Now I have a dilemma. A naive approach would be to scan the array, determine the index at which Joe Smith is and then ask UITableView to remove that precise row from the view, also removing it form the array. However, the scan will take linear time to finish. Now I could have an NSDictionary which allows me to find Joe Smith in constant time, but that doesn't do me a lot of good because I still need to find his ordinal index within the array in order to instruct UITableView to remove that row, which is again a linear search. I could further decide to store each object's ordinal inside the object itself to make it constant, but it will become outdated after first such update as all subsequent index values will have changed due to removal of an object. So what is the correct design pattern to accurately reflect model changes in the UITableView in costant (or at least logarithmic) time?

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• Migration for creating and deleting model in South

  - by Almad

  I've created a model and created initial migration for it: db.create_table('tvguide_tvguide', ( ('id', models.AutoField(primary_key=True)), ('date', models.DateField(_('Date'), auto_now=True, db_index=True)), )) db.send_create_signal('tvguide', ['TVGuide']) models = { 'tvguide.tvguide': { 'channels': ('models.ManyToManyField', ["orm['tvguide.Channel']"], {'through': "'ChannelInTVGuide'"}), 'date': ('models.DateField', ["_('Date')"], {'auto_now': 'True', 'db_index': 'True'}), 'id': ('models.AutoField', [], {'primary_key': 'True'}) } } complete_apps = ['tvguide'] Now, I'd like to drop it: db.drop_table('tvguide_tvguide') However, I have also deleted corresponding model. South (at least 0.6.2) is however trying to access it: (venv)[almad@eva-03 project]$ ./manage.py migrate tvguide Running migrations for tvguide: - Migrating forwards to 0002_removemodels. > tvguide: 0001_initial Traceback (most recent call last): File "./manage.py", line 27, in <module> execute_from_command_line() File "/usr/lib/python2.6/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line utility.execute() File "/usr/lib/python2.6/site-packages/django/core/management/__init__.py", line 303, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/usr/lib/python2.6/site-packages/django/core/management/base.py", line 195, in run_from_argv self.execute(*args, **options.__dict__) File "/usr/lib/python2.6/site-packages/django/core/management/base.py", line 222, in execute output = self.handle(*args, **options) File "/home/almad/projects/mypage-all/lib/python2.6/site-packages/south/management/commands/migrate.py", line 91, in handle skip = skip, File "/home/almad/projects/mypage-all/lib/python2.6/site-packages/south/migration.py", line 581, in migrate_app result = run_forwards(mapp, [mname], fake=fake, db_dry_run=db_dry_run, verbosity=verbosity) File "/home/almad/projects/mypage-all/lib/python2.6/site-packages/south/migration.py", line 388, in run_forwards verbosity = verbosity, File "/home/almad/projects/mypage-all/lib/python2.6/site-packages/south/migration.py", line 287, in run_migrations orm = klass.orm File "/home/almad/projects/mypage-all/lib/python2.6/site-packages/south/orm.py", line 62, in __get__ self.orm = FakeORM(*self._args) File "/home/almad/projects/mypage-all/lib/python2.6/site-packages/south/orm.py", line 45, in FakeORM _orm_cache[args] = _FakeORM(*args) File "/home/almad/projects/mypage-all/lib/python2.6/site-packages/south/orm.py", line 106, in __init__ self.models[name] = self.make_model(app_name, model_name, data) File "/home/almad/projects/mypage-all/lib/python2.6/site-packages/south/orm.py", line 307, in make_model tuple(map(ask_for_it_by_name, bases)), File "/home/almad/projects/mypage-all/lib/python2.6/site-packages/south/utils.py", line 23, in ask_for_it_by_name ask_for_it_by_name.cache[name] = _ask_for_it_by_name(name) File "/home/almad/projects/mypage-all/lib/python2.6/site-packages/south/utils.py", line 17, in _ask_for_it_by_name return getattr(module, bits[-1]) AttributeError: 'module' object has no attribute 'TVGuide' Is there a way around?

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• Searching for flexible way to specify conenction string used by APS.NET membership

  - by bzamfir

  Hi, I develop an asp.net web application and I use ASP.NET membership provider. The application uses the membership schema and all required objects inside main application database However, during development I have to switch to various databases, for different development and testing scenarios. For this I have an external connection strings section file and also an external appsettings section, which allow me to not change main web.config but switch the db easily, by changing setting only in appsettings section. My files are as below: <connectionStrings configSource="connections.config"> </connectionStrings> <appSettings file="local.config"> .... ConnectionStrings looks as usual: <connectionStrings> <add name="MyDB1" connectionString="..." ... /> <add name="MyDB2" connectionString="..." ... /> .... </connectionStrings> And local.config as below <appSettings> <add key="ConnectionString" value="MyDB2" /> My code takes into account to use this connection string But membership settings in web.config contains the connection string name directly into the setting, like <add name="MembershipProvider" connectionStringName="MyDB2" ...> .... <add name="RoleProvider" connectionStringName="MyDB2" ...> Because of this, every time I have to edit them too to use the new db. Is there any way to config membership provider to use an appsetting to select db connection for membership db? Or to "redirect" it to read connection setting from somewhere else? Or at least to have this in some external file (like local.config) Maybe is some easy way to wrap asp.net membership provider intio my own provider which will just read connection string from where I want and pass it to original membership provider, and then just delegate the whole membership functionality to asp.net membership provider. Thanks.

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• help in the Donalds B. Johnson's algorithm, i cannot understand the pseudo code

  - by Pitelk

  Hi , does anyone know the Donald B. Johnson's algorithm which enumarates all the elementary circuits (cycles) in a Directed graph? link text I have the paper he had published in 1975 but I cannot understand the pseudo-code. My goal is to implement this algorithm in java. Some questions i have is for example what is the matrix Ak it refers to. In the pseudo code mentions that Ak:=adjacency structure of strong component K with least vertex in subgraph of G induced by {s,s+1,....n}; Does that mean i have to implement another algorithm that finds the Ak matrix? Another question is what the following means? begin logical f; Does also the line "logical procedure CIRCUIT (integer value v);" means that the circuit procedure returns a logical variable. In the pseudo code also has the line "CIRCUIT := f;" . Does this mean? It would be great if someone could translate this 1970's pseudocode to a more modern type of pseudo code so i can understand it in case you are interested to help but you cannot find the paper please email me at [email protected] and i will send you the paper. Thanks in advance

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• WPF Exposing a calculated property for binding (as DependencyProperty)

  - by kubal5003

  Hello, I have a complex WPF control that for some reasons (ie. performance) is not using dependency properties but simple C# properties (at least at the top level these are exposed as properties). The goal is to make it possible to bind to some of those top level properties - I guess I should declare them as DPs.(right? or is there some other way to achieve this? ) I started reading on MSDN about DependencyProperties and DependencyObjects and found an example: public class MyStateControl : ButtonBase { public MyStateControl() : base() { } public Boolean State { get { return (Boolean)this.GetValue(StateProperty); } set { this.SetValue(StateProperty, value); } } public static readonly DependencyProperty StateProperty = DependencyProperty.Register( "State", typeof(Boolean), typeof(MyStateControl),new PropertyMetadata(false)); } If I'm right - this code enforces the property to be backed up by DependencyProperty which restricts it to be a simple property with a store(from functional point of view, not technically) instead of being able to calculate the property value each time getter is called and setting other properties/fields each time setter is called. What can I do about that? Is there any way I could make those two worlds meet at some point?

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• Currency exchange rates for paypal

  - by Jacco

  Does anyone know a way to get the currency exchange rates for paypal? We have custom shopping cart and use Paypal (Website Payments Standard) to handle payments. Our 'home' currency is Euro, but we would like to present our customers the option to pay in different currencies (USD, CAD, AUD and GBP). PayPal offers the option to:     a) automatically convert our Euro quoted prices to, for example, USD upon checkout     b) checkout in USD directly With option a): We get paid in Euro, the customer pays for the currency exchange (good). The customer does not know what he/she is going to be charged in USD until checkout. (bad) With option b) The customer pays in USD, then the currency is converted into EUR and we pay the the currency exchange. The customer never has to worry about the different currencies (excellent) We do not know the exchange rate PayPal is going to use so we cannot quote the correct prices to our customer (showstopper) So my question is:   Does anybody know a way to get the PayPal exchange rates? or   Does anybody know how to make a good estimate? Update: PayPal updates it's exchange rate 2 times a day. (at least, that is what they state). They use the Interbank Exchange Rate provided by ??? and add a 2.5% spread above this rate to determine their retail foreign exchange rates. Unforunately, there the Interbank Exchange Rates vary from source to source and from minute to minute. We have been monitoring the PayPal exchange rates and cross referenced them with the Official reference rates provides by the European Central Bank. the results vary widely, somewhere from 1 to 6 ! percent...

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• Need help with buffer overrun.

  - by Morinar

  I've got a buffer overrun I absolutely can't see to figure out (in C). First of all, it only happens maybe 10% of the time or so. The data that it is pulling from the DB each time doesn't seem to be all that much different between executions... at least not different enough for me to find any discernible pattern as to when it happens. The exact message from Visual Studio is this: A buffer overrun has occurred in hub.exe which has corrupted the program's internal state. Press Break to debug the program or Continue to terminate the program. For more details please see Help topic 'How to debug Buffer Overrun Issues'. If I debug, I find that it is broken in __report_gsfailure() which I'm pretty sure is from the /GS flag on the compiler and also signifies that this is an overrun on the stack rather than the heap. I can also see the function it threw this on as it was leaving, but I can't see anything in there that would cause this behavior, the function has also existed for a long time (10+ years, albeit with some minor modifications) and as far as I know, this has never happened. I'd post the code of the function, but it's decently long and references a lot of proprietary functions/variables/etc. I'm basically just looking for either some idea of what I should be looking for that I haven't or perhaps some tools that may help. Unfortunately, nearly every tool I've found only helps with debugging overruns on the heap, and unless I'm mistaken, this is on the stack. Thanks in advance.

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