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• Computer science textbooks

  - by Barrett Conrad

  I would like to try the book question a little bit differently. My goal is to know what the community thinks are the quintessential computer science textbooks. <beginsadstory>I lost all of my computer science and math books from college in Hurricane Katrina in 2005. I greatly miss having my familiar tomes to refer to when topics and problems come up, so I am looking to rebuild my library.<endsadstory> What are your recommendations for the best examples of academic caliber books for the field of computer science and its associated mathematics? I am looking for books on subjects like computational theory, programming languages, compilers, operating systems, algorithms and so on. Don't limit your suggestions to your textbooks only. If there is a book you have read that covers computer science or a related math in a formal way, but is not strictly a textbook, I would be love to hear about them as well. Finally, for the sake of creating a good reference for all of us, may I suggest posting one book per answer so they can be rated individually.

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• Best practices for class-mapping with SoapClient

  - by Foofy

  Using SoapClient's class mapping feature and it's pretty sweet. Unfortunately the SOAP service we're using has a bunch of read-only properties on some of the objects and will throw faults if the properties are passed back as anything but null. Need to filter out the properties before they're used in the SOAP call and am looking for advice on the best way to do it. So far the options are: Stick to a convention where I use getter and setter functions to manipulate the properties, and use property overloading to filter method access since only SoapClient would be doing that. E.g. developers would access properties like this: $obj->getAccountNumber() SoapClient would access properties like this: $obj->accountNumber I don't like this because the properties are still exposed and things could go wrong if developers don't stick to convention. Have a wrapper for SoapClient that sets a public property the mapped objects can check to see if the property is being accessed by SoapClient. I already have a wrapper that assigns a reference to itself to all the mapped objects. class SoapClientWrapper { public function __soapCall($method, $args) { $this->setSoapMode(true); $this->_soapClient->__soapCall($method, $args); $this->setSoapMode(false); } } class Invoice { function __get($val) { if($this->_soapClient->getSoapMode()) { return null; } else { return $this->$val; } } } This works but it doesn't feel right and seems a bit clunky. Do the mapping manually, and don't use SoapClient's mapping features. I'd just have a function on all the mapped objects that returns the safe-to-send properties. Also, nobody would have access to properties they shouldn't since I could enforce getters and setters. A lot more work, though.

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• Export the datagrid data to text in asp.net

  - by SRIRAM

  Problem:It will asks there is no assembly reference/namespace for Database Database db = DatabaseFactory.CreateDatabase(); DBCommandWrapper selectCommandWrapper = db.GetStoredProcCommandWrapper("sp_GetLatestArticles"); DataSet ds = db.ExecuteDataSet(selectCommandWrapper); StringBuilder str = new StringBuilder(); for(int i=0;i<=ds.Tables[0].Rows.Count - 1; i++) { for(int j=0;j<=ds.Tables[0].Columns.Count - 1; j++) { str.Append(ds.Tables[0].Rows[i][j].ToString()); } str.Append("<BR>"); } Response.Clear(); Response.AddHeader("content-disposition", "attachment;filename=FileName.txt"); Response.Charset = ""; Response.Cache.SetCacheability(HttpCacheability.NoCache); Response.ContentType = "application/vnd.text"; System.IO.StringWriter stringWrite = new System.IO.StringWriter(); System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite); Response.Write(str.ToString()); Response.End();

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• How can I return json from my WCF rest service (.NET 4), using Json.Net, without it being a string,

  - by Samuel Meacham

  The DataContractJsonSerializer is unable to handle many scenarios that Json.Net handles just fine when properly configured (specifically, cycles). A service method can either return a specific object type (in this case a DTO), in which case the DataContractJsonSerializer will be used, or I can have the method return a string, and do the serialization myself with Json.Net. The problem is that when I return a json string as opposed to an object, the json that is sent to the client is wrapped in quotes. Using DataContractJsonSerializer, returning a specific object type, the response is: {"Message":"Hello World"} Using Json.Net to return a json string, the response is: "{\"Message\":\"Hello World\"}" I do not want to have to eval() or JSON.parse() the result on the client, which is what I would have to do if the json comes back as a string, wrapped in quotes. I realize that the behavior is correct; it's just not what I want/need. I need the raw json; the behavior when the service method's return type is an object, not a string. So, how can I have my method return an object type, but not use the DataContractJsonSerializer? How can I tell it to use the Json.Net serializer instead? Or, is there someway to directly write to the response stream? So I can just return the raw json myself? Without the wrapping quotes? Here is my contrived example, for reference: [DataContract] public class SimpleMessage { [DataMember] public string Message { get; set; } } [ServiceContract] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)] public class PersonService { // uses DataContractJsonSerializer // returns {"Message":"Hello World"} [WebGet(UriTemplate = "helloObject")] public SimpleMessage SayHelloObject() { return new SimpleMessage("Hello World"); } // uses Json.Net serialization, to return a json string // returns "{\"Message\":\"Hello World\"}" [WebGet(UriTemplate = "helloString")] public string SayHelloString() { SimpleMessage message = new SimpleMessage() { Message = "Hello World" }; string json = JsonConvert.Serialize(message); return json; } // I need a mix of the two. Return an object type, but use the Json.Net serializer. }

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• ELF: linking: Why do I get undefined references in .so files

  - by ki.lya.online.fr

  Hi, I'm trying to build a program against wxWidgets, and I get a linker error. I'd like to really understand what it means. The error is: /usr/lib/libwx_baseu-2.8.so: undefined reference to `std::ctype<char>::_M_widen_init() const@GLIBCXX_3.4.11' What I don't understand is why the error is at libwx_baseu-2.8.so. I thought that .so files had all its symbols resolved, contrary to .o files that still need linking. When I ldd the .so, I get can resolve all its linked libraries, so there is no problem there: $ ldd /usr/lib/libwx_baseu-2.8.so linux-gate.so.1 => (0x00476000) libz.so.1 => /lib/libz.so.1 (0x00d9c000) libdl.so.2 => /lib/libdl.so.2 (0x002a8000) libm.so.6 => /lib/libm.so.6 (0x00759000) libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x002ad000) libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x0068d000) libpthread.so.0 => /lib/libpthread.so.0 (0x006f0000) libc.so.6 => /lib/libc.so.6 (0x00477000) /lib/ld-linux.so.2 (0x007f6000) Does it means that the .so file was not compiled correctly (in that case, it's a bug in my distribution package) or does it means that there are missing libraries on the linker command line for my particular program? Additionally, do you know how I can get a list on undefined symbols in an ELF file. I tried readelf -s but I can't find the missing symbol. Thank you. Mildred

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• ASP.net MVC - Update Model on complex models

  - by ludicco

  Hi there, I'm struggling myself trying to get the contents of a form which is a complex model and then update the model with that complex model. My account model has many individuals [AcceptVerbs(HttpVerbs.Post)] public ActionResult OpenAnAccount(string area,[Bind(Exclude = "Id")]Account account, [Bind(Prefix="Account.Individuals")] EntitySet<Individual> individuals){ var db = new DB(); account.individuals = invdividuals; db.Accounts.InsertOnSubmit(account); db.SubmitChanges(); } So it works nicely for adding new Records, but not for update them like: [AcceptVerbs(HttpVerbs.Post)] public ActionResult OpenAnAccount(string area,[Bind(Exclude = "Id")]Account account, [Bind(Prefix="Account.Individuals")] EntitySet<Individual> individuals){ var db = new DB(); var record = db.Accounts.Single(a => a.Reference == area); account.individuals = invdividuals; try{ UpdateModel(record, account); // I can't convert account ToValueProvider() db.SubmitChanges(); } catch{ return ... //Error Message } } My problem is being how to use UpdateModel with the account model since it's not a FormCollection. How can I convert it? How can I use ToValueProvider with a complex model? I hope I was clear enough Thanks a lot :)

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• Automatic (keyless) styles not applied when in a MergedDictionaries in another assembly

  - by Catalin DICU

  I moved the styles and templates xaml files form my application (.exe) project to a library project (.dll) because I want to use them in multiple applications. In App.xaml I have: <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="pack://application:,,,/MyApplication.Common;component/Resources/All.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources> In All.xaml (in the Common assembly) : <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Styles.xaml" /> <ResourceDictionary Source="Templates.xaml" /> <ResourceDictionary Source="Converters.xaml" /> </ResourceDictionary.MergedDictionaries> With this code keyless styles in Styles.xaml aren't applied. Instead, if I reference them directly in App.xaml, it works : <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="pack://application:,,,/MyApplication.Common;component/Resources/Styles.xaml" /> <ResourceDictionary Source="pack://application:,,,/MyApplication.Common;component/Resources/Templates.xaml" /> <ResourceDictionary Source="pack://application:,,,/MyApplication.Common;component/Resources/Converters.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources> Can anyone explain why it happens ?

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• Internationalized strings in Eclipse plugin.xml file are not found when installed in Eclipse applica

  - by Ed

  Hi, I have created 2 plugins, implementing an ODA driver plugin and its UI plugin for the BIRT extension to Eclipse. My plugins both work as expected when eclipse starts up another eclipse application where I can then test the plugins I am developing. However, when I install my plugins into an Eclipse application and then start it from a Windows shortcut, the plugins work but and language keys specified in the plugin.xml files are not found. For example, in my plugin.xml file for the ODA Driver plugin I set the attributes 'id' to '%oda.data.source.id' and the data source 'defaultDisplayName' to '%data.source.name'. I then, in a file 'language.properties', have defined the values for both of these keys (where the keys don't have the preceeding % character). When running the plugins that have been installed into the dropins/plugins directory of an Eclipse application, the wizard for creating my ODA data source names is as '%data.source.name' and saves the data source in the rptdesign (XML) file with an ID of '%oda.data.source.id'. Since 'language' is not the default name for the properties file I went into the manifest for both plugins and changed the 'Bundle-Localization' attribute to 'language'. The language file is located in the root directory of both of my plugins. The properties file is definitely found, since I use the two language files to store other strings used by the plugins, looked up using a java ResourceBundle. The strings are always found whether the plugins are run from Eclipse application loading another, or when properly installed in the dropins/plugins directory of an Eclipse application. Why are the installed plugins not finding language keys reference in the plugin.xml files? There are not errors in the logs and the language.properties files are clearly accessible... Thanks in advance.

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• DDD principlers and ASP.NET MVC project design

  - by kaivalya

  Two part questions I have a product aggregate that has; Prices PackagingOptions ProductDescriptions ProductImages etc I have modeled one product repository and did not create individual repositories for any of the child classes. All db operations are handled through product repository. Am I understanding the DDD concept correctly so far? Sometimes the question comes to my mind that having a repository for lets say packaging options could make my life easier by directly fetching a the packaging option from the DB by using its ID instead of asking the product repository to find it in its PackagingOptions collection and give it to me.. Second part is managing the edit create operations using ASP.MVC frame work I am currently trying to manage all add edit remove of these child collections of product through product controller(sound right?). One challenge I am now facing is; If I edit a specific packaging option of product through mydomain/product/editpackagingoption/10 I have access to the id of the packaging option But I don't have the ID of the product it self and this forces me to write a query to first find the product that has this specific packaging option then edit that product and the revelant packaging option. I can do this as all packaging option have their unique ID but this would fail if I have collections that don't have unique ID. That feels very wrong.. The next option I thought of is sending both the product and packaging option IDs on the url like; mydomain/product/editpackagingoption/3/10 But I am not sure if that is a good design either. So I am at a point that I am a bit confused. might be having fundamental misunderstandings around all of this... I would appreciate if you bear with the long question and help me put this together. thanks!

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• error: expected specifier-qualifier-list before...in Objective C ?

  - by Ridwan

  Hi guys. Whenever I build the following code, I get the error above. //Controller.h #import <UIKit/UIKit.h> #import <Foundation/Foundation.h> #import "PolygonShape.h" #import "PolygonView.h"; @interface Controller : NSObject { IBOutlet UIButton *decreaseButton; IBOutlet UIButton *increaseButton; IBOutlet UILabel *numberOfSidesLabel; IBOutlet PolygonShape *shape; IBOutlet PolygonView *shapeView; } - (IBAction)decrease; - (IBAction)increase; - (void)awakeFromNib; @end //Controller.m #import "Controller.h" @implementation Controller @end However, when I replace the import statement and put a forward class reference instead, the code compiles. //Controller.h #import <UIKit/UIKit.h> #import <Foundation/Foundation.h> #import "PolygonShape.h" @class PolygonView; @interface Controller : NSObject { IBOutlet UIButton *decreaseButton; IBOutlet UIButton *increaseButton; IBOutlet UILabel *numberOfSidesLabel; IBOutlet PolygonShape *shape; IBOutlet PolygonView *shapeView; } - (IBAction)decrease; - (IBAction)increase; - (void)awakeFromNib; @end //Controller.m #import "Controller.h" #import "PolygonView.h" @implementation Controller @end Can anyone explain?

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• Problem with Flash...help

  - by aarontb

  Hey Guys...need help. Working on a project and get this error on the Output Log TypeError: Error #1009: Cannot access a property or method of a null object reference. at FlashSite_fla::MainTimeline/frame16() Here's every frame that is on, begins, or crosses frame 16 Layer Name: Top Menu (4 Button named Home_btn, Works_btn, Tech_btn, Contact_btn) Code attached to frame: stop(); Home_btn.addEventListener(MouseEvent.CLICK, home); function home(event:MouseEvent):void { gotoAndStop(16); } Works_btn.addEventListener(MouseEvent.CLICK, works); function works(event:MouseEvent):void { gotoAndStop(17); } Tech_btn.addEventListener(MouseEvent.CLICK, tech); function tech(event:MouseEvent):void { gotoAndStop(18); } Contacts_btn.addEventListener(MouseEvent.CLICK, contact); function contact(event:MouseEvent):void { gotoAndStop(19); } Layer Name: Investment Opp (button named Invest_btn) Code attached to frame: Invest_btn.addEventListener(MouseEvent.CLICK, invest); function invest(event:MouseEvent):void { var link:URLRequest = new URLRequest('#'); navigateToURL(link); } Layer Name: MfgOpp (Button named Mfg_btn) Code attached to frame: Mfg_btn.addEventListener(MouseEvent.CLICK, mfg); function mfg(event:MouseEvent):void { var link:URLRequest = new URLRequest('#'); navigateToURL(link); } Layer Name: MarketResearch (button name Own_btn) Code attached to frame: Own_btn.addEventListener(MouseEvent.CLICK, own); function own(event:MouseEvent):void { var link:URLRequest = new URLRequest('#'); navigateToURL(link); } Layer Name: ActionScript Code attached to frame: import flash.events.MouseEvent; What am I doing wrong?!?!

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• C++ resize a docked Qt QDockWidget programmatically?

  - by Zac

  I've just started working on a new C++/Qt project. It's going to be an MDI-based IDE with docked widgets for things like the file tree, object browser, compiler output, etc. One thing is bugging me so far though: I can't figure out how to programmatically make a QDockWidget smaller. For example, this snippet creates my bottom dock window, "Build Information": m_compilerOutput = new QTextEdit; m_compilerOutput->setReadOnly(true); dock = new QDockWidget(tr("Build Information"), this); dock->setWidget(m_compilerOutput); addDockWidget(Qt::BottomDockWidgetArea, dock); When launched, my program looks like this: http://yfrog.com/6ldreamidep (bear in mind the early stage of development) However, I want it to appear like this: http://yfrog.com/20dreamide2p I can't seem to get this to happen. The Qt Reference on QDockWidget says this: Custom size hints, minimum and maximum sizes and size policies should be implemented in the child widget. QDockWidget will respect them, adjusting its own constraints to include the frame and title. Size constraints should not be set on the QDockWidget itself, because they change depending on whether it is docked Now, this suggests that one method of going about doing this would be to sub-class QTextEdit and override the sizeHint() method. However, I would prefer not to do this just for that purpose, nor have I tried it to find that to be a working solution. I have tried calling dock-resize(m_compilerOutput-width(), m_compilerOutput-minimumHeight()), calling m_compilerOutput-setSizePolicy() with each of its options...nothing so far has affected the size. Like I said, I would prefer a simple solution in a few lines of code to having to create a sub-class just to change sizeHint(). All suggestions are appreciated.

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• My Android ListView item layout looks terrible

  - by jnylen

  I wanted to create a layout like the CyanogenMod call log in that there is a list item and a call button on the left which gets focus separately (screenshot). Instead, I get this mess. Here's my code: <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:minHeight="?android:attr/listPreferredItemHeight" android:layout_width="fill_parent" android:layout_height="fill_parent" android:paddingLeft="4dip" > <DontPressWithParentImageView android:id="@+id/play_icon" android:layout_width="wrap_content" android:layout_height="fill_parent" android:paddingLeft="14dip" android:paddingRight="14dip" android:layout_alignParentRight="true" android:gravity="center_vertical" android:src="@drawable/sym_play" android:background="@drawable/play_background" /> <View android:id="@+id/divider" android:layout_width="1px" android:layout_height="fill_parent" android:layout_marginTop="5dip" android:layout_marginBottom="5dip" android:layout_toLeftOf="@id/play_icon" android:layout_marginLeft="2dip" android:background="@drawable/divider_vertical_dark" /> <TextView android:id="@+id/file_info" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_marginBottom="8dip" android:layout_marginTop="-10dip" android:layout_marginLeft="10dip" android:layout_alignWithParentIfMissing="true" android:singleLine="true" android:ellipsize="marquee" android:textAppearance="?android:attr/textAppearanceSmall" android:textStyle="bold" /> <TextView android:id="@+id/file_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_above="@id/file_info" android:layout_alignWithParentIfMissing="true" android:layout_marginBottom="-10dip" android:layout_marginLeft="4dip" android:textAppearance="?android:attr/textAppearanceLarge" android:singleLine="true" android:ellipsize="marquee" android:gravity="center_vertical" /> </RelativeLayout> For reference, the code I started with is here and here, and the source to DontPressWithParentImageView is here (but as you can see from my screenshot, that part is working). What am I doing wrong?

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• Accessing bean object methods from xhtml in RichFaces

  - by Mark Lewis

  Hello When I use (1) in my xhtml, I get an error as in (2). How can I access the size of an array in my bean? (1) A List of objects of a custom class type, accessed through the following h:outputText in a rich:column in a rich:subTable in a rich:dataTable: <h:outputText value="Info: #{f.filemask.size()}" /> (2) Caused by: com.sun.facelets.tag.TagAttributeException: /nodeConfig.xhtml @190,91 value="Info: #{f.filemask.size()" Error Parsing: Info:  #{f.filemask.size()} at com.sun.facelets.tag.TagAttribute.getValueExpression(TagAttribute.java:259) ... Caused by: org.apache.el.parser.ParseException: Encountered " "(" "( "" at line 1, column 41. Was expecting one of: "}" ... "." ... "[" ... ">" ... "gt" ... "<" ... "lt" ... ">=" ... "ge" ... "<=" ... "le" ... "==" ... "eq" ... "!=" ... "ne" ... "&&" ... "and" ... "||" ... "or" ... "*" ... "+" ... "-" ... "/" ... "div" ... "%" ... "mod" ... Any help greatly appreciated. I cannot seem to find references to using methods like this but this reference reported it working fine

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• Fast screen capture and lost Vsync

  - by user338759

  Hi, I'd like to generate a movie in real time with a self-made application doing fast screen captures with part of the screen occupied by a running 3D application. I'm aware that several applications already exist for this (like FRAPS or Taksi), and even dedicated DirectShow filters (like UScreenCapture), but i really need to make this with my own external application. When correctly setup (UScreenCapture + ffdshow), capturing an compressing a full screen does not consumes as much CPU as you would expect (about 15%), and does not impairs the performances of the 3D app. The problem of doing a capture from an external application is that the 3D application loses it's Vsync and creates a shaggy, difficult to use 3D application (3D app is only presented on a small part of the screen, the rest being GDI, DirectX) FRAPS solves this problem by allowing you to capture only one application at a time (the one with focus). Depending on the technology used (OpenGl, DirectX, GDI), it hooks the Vsync and does its capture (with glReadPixels,...), without perturbing it. Doing this does not solve my problem, since I want the full composed screen image (including 3D and the rest) AND a smooth 3D app. The UScreenCapture seems to use a fast DirectX call to capture the whole screen, but the openGL 3D app is still out of sync. Doing a BitBlt is too slow and CPU consumming to do real time 30 fps acquisition (at least under windows XP, not sure with 7) My question is to know if there is a way to achieve my goal with Windows 7 and it's brand new DirectX compositing engine? Windows 7 succeeds to show live VSynced duplicated previews of every app (in the taskbar), so there must be a way to access the currenlty displayed screen buffer without perturbing the rendering of the 3D OpenGL app ? Any other suggestion, technology ? thank you

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• Selenium RC test - IE gives 403 error on Tomcat app, Tomcat root OK

  - by Ed Daniel

  I'm new to Selenium RC, having previously used Selenium IDE and only run tests in Firefox. I'm trying to get a basic test to run using Selenium RC through Eclipse; my test works OK in Firefox, and in Safari now that I've killed the pop-up blocker, but IE8 is causing a SeleniumException to be thrown, containing an "XHR ERROR" with a 403 response: com.thoughtworks.selenium.SeleniumException: XHR ERROR: URL = http://localhost:8080/pims Response_Code = 403 Error_Message = Forbidden at com.thoughtworks.selenium.HttpCommandProcessor.throwAssertionFailureExceptionOrError(HttpCommandProcessor.java:97) at com.thoughtworks.selenium.HttpCommandProcessor.doCommand(HttpCommandProcessor.java:91) at com.thoughtworks.selenium.DefaultSelenium.open(DefaultSelenium.java:335) at org.pimslims.seleniumtest.FirstTest.testNew(FirstTest.java:32) ... I can do a similar test on http:/ /localhost:8080 (space between the slashes here because SO thinks I'm spamming) and it's fine - I can make IE open that Tomcat default page and click a link. It's only if I try to open my application at http:/ /localhost:8080/pims that I see this error - and only in IE. I can open that URL in IE by typing it into the address bar. I was convinced that there's some setting in IE that's causing this, but I've tried everything I can think of. http:/ /localhost:8080 is in my Trusted Sites, and I've turned the security for that zone down to the minimum, allowed anything that looks related to popups, etc. If I try adding http:/ /localhost:8080/pims/ to Trusted Sites, IE says it's already there. I've also messed around with proxy settings, to no avail, but may have missed something obvious. I've tried starting the test with *iexplore, *iehta, and *iexploreproxy - all behave the same. Is there something I've missed? For reference, here is my test case - this works as is, in Firefox, opening the PIMS application's index page and clicking a link: public class FirstTest extends SeleneseTestCase { @Override public void setUp() throws Exception { this.setUp("http://localhost:8080/", "*firefox"); } public void testNew() throws Exception { final Selenium s = this.selenium; s.open("/pims"); s.click("logInOutLink"); s.waitForPageToLoad("30000"); } } Any help is greatly appreciated!

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• Django User M2M relationship

  - by Antonio

  When trying to syncdb with the following models: class Contact(models.Model): user_from = models.ForeignKey(User,related_name='from_user') user_to = models.ForeignKey(User, related_name='to_user') class Meta: unique_together = (('user_from', 'user_to'),) User.add_to_class('following', models.ManyToManyField('self', through=Contact, related_name='followers', symmetrical=False)) I get the following error: Error: One or more models did not validate: auth.user: Accessor for m2m field 'following' clashes with related m2m field 'User.followers'. Add a related_name argument to the definition for 'following'. auth.user: Reverse query name for m2m field 'following' clashes with related m2m field 'User.followers'. Add a related_name argument to the definition for 'following'. auth.user: The model User has two manually-defined m2m relations through the model Contact, which is not permitted. Please consider using an extra field on your intermediary model instead. auth.user: Accessor for m2m field 'following' clashes with related m2m field 'User.followers'. Add a related_name argument to the definition for 'following'. auth.user: Reverse query name for m2m field 'following' clashes with related m2m field 'User.followers'. Add a related_name argument to the definition for 'following'.

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• Sending Email from Lotus Notes using Excel and having Attachment & HTML body

  - by Anthony

  Right I'm trying to send an Email form an excel spreadsheet though lotus notes, it has an attachment and the body needs to be in HTML. I've got some code that from all I've read should allow me to do this however it doesn't. Without the HTML body the attachment will send, when I impliment a HTML body the Email still sends but the attachment dissapears, I've tried rearanging the order of the code cutting out bits that might not be needed but all is invain. (You need to reference Lotus Domino Objects to run this code. strEmail is the email addresses strAttach is the string location of the attachment strSubject is the subject text strBody is the body text ) Sub Send_Lotus_Email(strEmail, strAttach, strSubject, strBody) Dim noSession As Object, noDatabase As Object, noDocument As Object Dim obAttachment As Object, EmbedObject As Object Const EMBED_ATTACHMENT As Long = 1454 Set noSession = CreateObject("Notes.NotesSession") Set noDatabase = noSession.GETDATABASE("", "") 'If Lotus Notes is not open then open the mail-part of it. If noDatabase.IsOpen = False Then noDatabase.OPENMAIL 'Create the e-mail and the attachment. Set noDocument = noDatabase.CreateDocument Set obAttachment = noDocument.CreateRichTextItem("strAttach") Set EmbedObject = obAttachment.EmbedObject(EMBED_ATTACHMENT, "", strAttach) 'Add values to the created e-mail main properties. With noDocument .Form = "Memo" .SendTo = strEmail '.Body = strBody ' Where to send the body if HTML body isn't used. .Subject = strSubject .SaveMessageOnSend = True End With noSession.ConvertMIME = False Set Body = noDocument.CreateMIMEEntity("Body") ' MIMEEntity to support HTML Set stream = noSession.CreateStream Call stream.WriteText(strBody) ' Write the body text to the stream Call Body.SetContentFromText(stream, "text/html;charset=iso-8859-1", ENC_IDENTITY_8BIT) noSession.ConvertMIME = True 'Send the e-mail. With noDocument .PostedDate = Now() .Send 0, strEmail End With 'Release objects from the memory. Set EmbedObject = Nothing Set obAttachment = Nothing Set noDocument = Nothing Set noDatabase = Nothing Set noSession = Nothing End Sub If somone could point me in the right direction I'd be greatly appreciated. Edit: I've done a little more investigating and I've found an oddity, if i look at the sent folder the emails all have the paperclip icon of having an attachment even though when you go into the email even in the sent the HTML ones don't show an attachment.

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• Pylons error "No object (name: request) has been registered for this thread" with debug = false

  - by Evgeny

  I'm unable to access the request object in my Pylons 0.9.7 controller when I set debug = false in the .ini file. I have the following code: def run_something(self): print('!!! request = %r' % request) print('!!! request.params = %r' % request.params) yield 'Stuff' With debugging enabled this works fine and prints out: !!! request = <Request at 0x9571190 POST http://my_url> !!! request.params = UnicodeMultiDict([... lots of stuff ...]) If I set debug = false I get the following: !!! request = <paste.registry.StackedObjectProxy object at 0x4093790> Error - <type 'exceptions.TypeError'>: No object (name: request) has been registered for this thread The stack trace confirms that the error is on the print('!!! request.params = %r' % request.params) line. I'm running it using the Paste server and these two lines are the very first lines in my controller method. This only occurs if I have yield statements in the method (even though the statements aren't reached). I'm guessing Pylons sees that it's a generator method and runs it on some other thread. My questions are: How do I make it work with debug = false ? Why does it work with debug = true ? Obviously this is quite a dangerous bug, since I normally develop with debug = true, so it can go unnoticed during development.

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• New To StructureMap - Getting No Default Instance Error 202

  - by Code Sherpa

  Hi. I am very new to StructureMap and am getting the following error: StructureMap Exception Code: 202 No Default Instance defined for PluginFamily Company.ProjectCore.Core.IUserSession, Company.ProjectCore, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null It seems to be hitting the first interface instance on compile and then throws the above error: private readonly IUserSession _userSession; public SiteMaster() { _userSession = ObjectFactory.GetInstance<IUserSession>(); // ERROR THROWN HERE ... } For what it is worth, I have the PluginFamily reference above all of interfaces: [PluginFamily("Default")] public interface IUserSession Below is my entire StructureMap.config <StructureMap> <Assembly Name="Company.ProjectWeb" /> <Assembly Name="Company.ProjectCore" /> <!-- Use DefaultKey="Default" for standard cache or DefaultKey="MemCached" for memcached cache. --> <PluginFamily Assembly="Company.ProjectCore" Type="Company.ProjectCore.Core.ICache" DefaultKey="MemCached" /> <!-- Use DefaultKey="Default" for sending the email in real time through the configured mail server or use DefaultKey="MailQueue" to send the mail in batches through another process --> <PluginFamily Assembly="Company.ProjectCore" Type="Company.ProjectCore.Core.IEmailService" DefaultKey="MailQueue" /> <!-- Use DefaultKey="Default" for standard cache or DefaultKey="UserSession" for memcached cache. --> <PluginFamily Assembly="Company.ProjectCore" Type="Company.ProjectCore.Core.IUserSession" DefaultKey="UserSession" /> <!-- Use DefaultKey="Default" for standard cache or DefaultKey="Redirector" for memcached cache. --> <PluginFamily Assembly="Company.ProjectCore" Type="Company.ProjectCore.Core.IRedirector" DefaultKey="Redirector" /> <!-- Use DefaultKey="Default" for standard cache or DefaultKey="Navigation" for memcached cache. --> <PluginFamily Assembly="Company.ProjectCore" Type="Company.ProjectCore.Core.INavigation" DefaultKey="Navigation" /> Any suggestions? Thanks.

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• svcutil, WSDL, and the generated interfaces not being sufficient for implementation

  - by chtmd

  I have a WSDL file defining a service that I have to implement in WCF. I had read that I could generate the proxy using svcutil from the WSDL file, and that I could then use the generated interfaces to implement the service. Unfortunately, I can't quite seem to find a way to have the interfaces contain the correct attributes to expose the contracts. All operations have the "OperationContractAttribute" attribute, but it appears as though for the service to be exposed, I require the "OperationContract" for each one. Same thing with "ServiceContractAttribute" and "ServiceContract", and I imagine DataContract, but I haven't gotten that far. I could manually make these changes, but I would much prefer a technique where the existing code could be easily used, or better code could be generated for my uses. Is there some way that this can be done? Thanks. EDIT: Command used: svcutil ObjectManagerService.wsdl /n:*,Sample /o:ObjectManagerServiceProxy.cs /nologo Code sample: public interface ObjectManagerSyncPortType { // CODEGEN: Generating message contract since the operation createObject is neither RPC nor document wrapped. [System.ServiceModel.OperationContractAttribute(Action="http://www.sample.com/createObject", ReplyAction="*")] [System.ServiceModel.XmlSerializerFormatAttribute()] Sample.createObjectResponse1 createObject(Sample.createObjectRequest1 request); As best as I can tell/see the WSDL file is entirely self-contained and requires no additional XSD files.

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• UIView Animation animates position but not width

  - by Aaron Vegh

  Hi there, I'm trying to transform a UISearchBar, like in Mobile Safari: touch in the search field and it grows while the location field shrinks. My current animation to alter the width and position of the search field only animates the position: just before it slides to the right place, it simply snaps out to the right width. Here's my code: [UIView beginAnimations:@"searchGrowUp" context:nil]; [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; [UIView setAnimationDuration:0.5f]; [UIView setAnimationDelegate:self]; CGFloat findFieldWidth = findField.frame.size.width; CGFloat urlFieldWidth = urlField.frame.size.width; CGRect findFieldFrame = findField.frame; CGRect urlFieldFrame = urlField.frame; findFieldFrame.origin.x = findFieldFrame.origin.x - 150.0f; findFieldFrame.size.width = findFieldWidth + 150.0f; urlFieldFrame.size.width = urlFieldWidth - 150.0f; urlField.frame = urlFieldFrame; findField.frame = findFieldFrame; [UIView commitAnimations]; I've modified this code slightly for the sake of presenting it here, but I hope this gives the gist. Any guesses as to why this is happening would be appreciated! Cheers, Aaron.

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• What makes static initialization functions good, bad, or otherwise?

  - by Richard Levasseur

  Suppose you had code like this: _READERS = None _WRITERS = None def Init(num_readers, reader_params, num_writers, writer_params, ...args...): ...logic... _READERS = new ReaderPool(num_readers, reader_params) _WRITERS = new WriterPool(num_writers, writer_params) ...more logic... class Doer: def __init__(...args...): ... def Read(self, ...args...): c = _READERS.get() try: ...work with conn finally: _READERS.put(c) def Writer(...): ...similar to Read()... To me, this is a bad pattern to follow, some cons: Doers can be created without its preconditions being satisfied The code isn't easily testable because ConnPool can't be directly mocked out. Init has to be called right the first time. If its changed so it can be called multiple times, extra logic has to be added to check if variables are already defined, and lots of NULL values have to be passed around to skip re-initializing. In the event of threads, the above becomes more complicated by adding locking Globals aren't being used to communicate state (which isn't strictly bad, but a code smell) On the other hand, some pros: its very convenient to call Init(5, "user/pass", 2, "user/pass") It simple and "clean" Personally, I think the cons outweigh the pros, that is, testability and assured preconditions outweigh simplicity and convenience.

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• FileSystem.GetFiles() + UnauthorizedAccessException error?

  - by OverTheRainbow

  Hello, It seems like FileSystem.GetFiles() is unable to recover from the UnauthorizedAccessException exception that .Net triggers when trying to access an off-limit directory. In this case, does it mean this class/method isn't useful when scanning a whole drive and I should use some other solution (in which case: Which one?)? Here's some code to show the issue: Private Sub bgrLongProcess_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork Dim drive As DriveInfo Dim filelist As Collections.ObjectModel.ReadOnlyCollection(Of String) Dim filepath As String 'Scan all fixed-drives for MyFiles.* For Each drive In DriveInfo.GetDrives() If drive.DriveType = DriveType.Fixed Then Try 'How to handle "Access to the path 'C:\System Volume Information' is denied." error? filelist = My.Computer.FileSystem.GetFiles(drive.ToString, FileIO.SearchOption.SearchAllSubDirectories, "MyFiles.*") For Each filepath In filelist DataGridView1.Rows.Add(filepath.ToString, "temp") 'Trigger ProgressChanged() event bgrLongProcess.ReportProgress(0, filepath) Next filepath Catch Ex As UnauthorizedAccessException 'How to ignore this directory and move on? End Try End If Next drive End Sub Thank you. Edit: What about using a Try/Catch just to have GetFiles() fill the array, ignore the exception and just resume? Private Sub bgrLongProcess_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bgrLongProcess.DoWork 'Do lengthy stuff here Dim filelist As Collections.ObjectModel.ReadOnlyCollection(Of String) Dim filepath As String filelist = Nothing Try filelist = My.Computer.FileSystem.GetFiles("C:\", FileIO.SearchOption.SearchAllSubDirectories, "MyFiles.*") Catch ex As UnauthorizedAccessException 'How to just ignore this off-limit directory and resume searching? End Try 'Object reference not set to an instance of an object For Each filepath In filelist bgrLongProcess.ReportProgress(0, filepath) Next filepath End Sub

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• Creating an MJPEG Viewer Iphone

  - by Tony

  Hey all, Im trying to make a MJPEG viewer in Objective C but I'm having a bunch of issues with it. First off, Im using AsyncSocket(http://code.google.com/p/cocoaasyncsocket/) which lets me connect to the host. Here's what I got so far NSLog(@"Ready"); asyncSocket = [[AsyncSocket alloc] initWithDelegate:self]; //http://kamera5.vfp.slu.se/axis-cgi/mjpg/video.cgi NSError *err = nil; if(![asyncSocket connectToHost:@"kamera5.vfp.slu.se" onPort:80 error:&err]) { NSLog(@"Error: %@", err); } then in the didConnectToHost method: - (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port{ NSLog(@"Accepted client %@:%hu", host, port); NSString *urlString = [NSString stringWithFormat:@"http://kamera5.vfp.slu.se/axis-cgi/mjpg/video.cgi"]; NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease]; [request setURL:[NSURL URLWithString:urlString]]; [request setHTTPMethod:@"GET"]; //set headers NSString *_host = [NSString stringWithFormat:host]; [request addValue:_host forHTTPHeaderField: @"Host"]; NSString *KeepAlive = [NSString stringWithFormat:@"300"]; [request addValue:KeepAlive forHTTPHeaderField: @"Keep-Alive"]; NSString *connection = [NSString stringWithFormat:@"keep-alive"]; [request addValue:connection forHTTPHeaderField: @"Connection"]; //get response NSHTTPURLResponse* urlResponse = nil; NSError *error = [[NSError alloc] init]; NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error]; NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; NSLog(@"Response Code: %d", [urlResponse statusCode]); if ([urlResponse statusCode] >= 200 && [urlResponse statusCode] < 300) { NSLog(@"Response: %@", result); //here you get the response } } This calls the MJPEG stream, but it doesn't call it to get more data. What I think its doing is just loading the first chunk of data, then disconnecting. Am I doing this totally wrong or is there light at the end of this tunnel? Thanks!

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