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• Using boost.python to import a method with opencv calls but failing due to symbols not being found a

  - by nmz787

  So I don't have the code right now, as I am not home... but i used the boost library for python in C++ to allow python to access a function called something like loadImageIntoMainWindow(string filepath) in the C++ source code the method calls opencv methods that are imported at the top of the file, I included opencv in my Jamroot file, and also found a way to compile and link manually on the command line... in either case when I run my python file it complains that the symbols aren't found for the first function call to an opencv method... I will update as soon as I get home with the C++, the command line compilation lines, the Jamroot, and the python files

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• Using a c# .net object in an Excel VBA form

  - by Mark O'G

  Hi I have a .net object that I want to use in Excel. I have an existing VBA script that i need to alter to call this the object from. I have then converted the object to a TLB. I've not really touched on this area before so any help will be appreciated. I have created an interface [Guid("0F700B48-E0CA-446b-B87E-555BCC317D74"),InterfaceType(ComInterfaceType.InterfaceIsDual)] public interface IOfficeCOMInterface { [DispId(1)] void ResetOrder(); [DispId(2)] void SetDeliveryAddress(string PostalName, string AddressLine1, string AddressLine2, string AddressLine3, string AddressLine4, string PostCode, string CountryCode, string TelephoneNo, string FaxNo, string EmailAddress); } I have also created an class that inherits that object. [ClassInterface(ClassInterfaceType.None), ProgId("NAMESPACE.OfficeCOMInterface"), Guid("9D9723F9-8CF1-4834-BE69-C3FEAAAAB530"), ComVisible(true)] public class OfficeCOMInterface : IOfficeCOMInterface, IDisposable { public void ResetSOPOrder() { } public void SetDeliveryAddress(string PostalName, string AddressLine1, string AddressLine2, string AddressLine3, string AddressLine4, string PostCode, string CountryCode, string TelephoneNo, string FaxNo, string EmailAddress) { try { SalesOrder.AmendDeliveryAddress(PostalName, AddressLine1, AddressLine2, AddressLine3, AddressLine4, PostCode); MessageBox.Show("Delivery address set"); } catch (Exception ex) { throw ex; } } }

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• JNI_CreateJavaVM: Buffer overrun if I throw an exception in case of failure

  - by Dominik Fretz

  Hi, In a C++ project, I use the JNI invocation API to launch a JVM. I've done a little wrapper arount the JVM so I can use all the needed parts in a OO fashion. So far that works great. Now, if the JVM does not start (JNI_CreateJavaVM returns a value < 0) I'd like to raise an exception within my C++ code.But if I throw an exception after JNI_CreateJavaVM, I get a buffer overrun. If I raise the exception without the JNI_CreateJavaVM call, it works as expected. Does anyone have a clue on what the issue could be here? Or how to debug this? Environment: Windows, Visual Studio 2008 JDK: jrockit27.6jdk16005, but happens with SUN stock one as well Cheers Dominik

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• No method found compiler warning

  - by Magic Bullet Dave

  I have create a class from a string, check it is valid and then check if it responds to a particular method. If it does then I call the method. It all works fine, except I get an annoying compiler warning: "warning: no '-setCurrentID:' method found". Am I doing something wrong here? Is there anyway to tell the compiler all is ok and stop it reporting a warning? The here is the code: // Create an instance of the class id viewController = [[NSClassFromString(class) alloc] init]; // Check the class supports the methods to set the row and section if ([viewController respondsToSelector:@selector(setCurrentID:)]) { [viewController setCurrentID:itemID]; } // Push the view controller onto the tab bar stack [self.navigationController pushViewController:viewController animated:YES]; [viewController release]; Cheers Dave

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• Dictionary keys don't contain a key that's already contained in keys

  - by ran

  Why is the following 'exist' boolean variable getting a value of false??? foreach (Cell existCell in this.decoratorByCell.Keys) { //this call yield the same hashcode for both cells. still exist==false bool exist = this.decoratorByCell.ContainsKey(existCell); } I've overridden GetHashCode() & Equals() Methods as follows: public override int GetHashCode() { string nodePath = GetNodePath(); return nodePath.GetHashCode() + m_ownerColumn.GetHashCode(); } public bool Equals(Cell other) { bool nodesEqual = (other.OwnerNode == null && this.OwnerNode == null) || (other.GetNodePath() == this.GetNodePath()); bool columnsEqual = (other.OwnerColumn == null && this.OwnerColumn == null) || (other.OwnerColumn == this.OwnerColumn); bool treesEqual = (this.m_ownerTree == other.m_ownerTree); return (nodesEqual && columnsEqual && treesEqual); }

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• Tree item edit event listener in flex

  - by Biroka

  I want to catch itemEditEnd in a tree control, but i'm having a little trouble. I call the item editing a bit different: <mx:Tree id="tree" width="100%" height="100%" itemDoubleClick="treeProjects_itemDoubleClickHandler(event)" doubleClickEnabled="true" editable="true" itemEditBeginning="treeProjects_itemEditBeginingHandler(event)" itemEditEnd="treeProjects_itemEditEndHandler(event)" > but: protected function treeProjects_itemEditBeginingHandler(event:ListEvent):void { event.preventDefault(); } i do this, because I want to edit the field just when clicking rename in the context menu. And when I click rename in the context menu, this is what i'm doing (contextParentItem is the event catched on itemRollOver in the tree) : Tree( contextParentItem.target ).editedItemPosition = { columnIndex: 0, rowIndex: contextParentItem.rowIndex }; Thisway I can't catch the itemEditEnd event, but I want to handle some stuff, like: if the new entered value is an empty string, then I don't want to accept the new value if I hit ESC then, the old value should remain.

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• Prototype's Ajax.Request not working in Chrome

  - by Jason

  I am just doing a simple Ajax.Request call using the newest version of Prototype. It works fine in Firefox, Internet Explorer, and even Safari... but not in Chrome. Here is my code... alert(url); new Ajax.Request(url, { method: 'get', onSuccess: function(transport) { alert('test'); } }); It pops up he URL alert but the test alert never comes up. Like I said it does in every other browser. I am not getting any javascript errors and I have used Firebug. I did a console.log on each event and it gets to the onLoading stage of Ajax.Request but never onLoaded. Very confused... ?

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• Abstract out repeated code

  - by CookieMonster

  The code in this event is repeated exactly in two other event handlers. How do I put the repeated code into a method and call that method from the event handlers so I only have to maintain it in one place? I'm not sure how to pass the event args to the calling method. protected void gvDocAssoc_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { if ((Convert.ToString(DataBinder.Eval(e.Row.DataItem, "DETAIL_TYPE_DESC")) == "Transcript") && (Convert.ToString(DataBinder.Eval(e.Row.DataItem, "INSTITUTION_CODE")) == "")) { e.Row.BackColor = System.Drawing.Color.Red; } if ((Convert.ToString(DataBinder.Eval(e.Row.DataItem, "DETAIL_TYPE_DESC")) == "Certified Diploma") && (Convert.ToString(DataBinder.Eval(e.Row.DataItem, "INSTITUTION_CODE")) == "")) { e.Row.BackColor = System.Drawing.Color.Red; } if ((Convert.ToString(DataBinder.Eval(e.Row.DataItem, "DOC_TYPE_DESC")) == "Post Graduate conditions") && (Convert.ToString(DataBinder.Eval(e.Row.DataItem, "INSTITUTION_CODE")) == "")) { e.Row.BackColor = System.Drawing.Color.Red; } } }

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• VisualBasic.net Database Boiler Plate

  - by Shiftbit

  Is there any built in .net Classes to assist in the reduction of boiler plate code? I have numerous database operations going on and I find that I am reproducing the connection, command, transaction and occassianlly data set. I am aware of the Java Related Question, however, the solutions pertain to Java. I was wondering if anyone was aware of a .net solution? http://stackoverflow.com/questions/1072925/remove-boilerplate-from-db-code Public Sub ReadData(ByVal connectionString As String) Dim queryString As String = "SELECT EmpNo, EName FROM Emp" Using connection As New OracleConnection(connectionString) Dim command As New OracleCommand(queryString, connection) connection.Open() Using reader As OracleDataReader = command.ExecuteReader() ' Always call Read before accessing data. While reader.Read() Console.WriteLine(reader.GetInt32(0).ToString() + ", " _ + reader.GetString(1)) End While End Using End Using End Sub MSDN

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• python unichr problem

  - by jacob

  I've got some problem with unichr() on my server. Please see below: On my server (Ubuntu 9.04): >>> print unichr(255) Traceback (most recent call last): File "<stdin>", line 1, in <module> UnicodeEncodeError: 'ascii' codec can't encode character u'\xff' in position 0: ordinal not in range(128) On my desktop (Ubuntu 9.10): >>> print unichr(255) ÿ I'm fairly new to python so I don't know how to solve this. Anyone care to help? Thanks.

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• Need a Security Scenario for asp.net webservice

  - by Karamafrooz

  I have developed a .Net 3.5 windows forms application. I also want to design a website that has a webservice with multiple Webmethods to query the database on the host machine. I want the webservice to be called ONLY through my winapp and my website! And I don't want any other people to be able to call and use my webservice but only some people who have access to the windows application that I have developed. I need a good security scenario for this! I truly appreciate anyone who can help me because this is my first experience of developing a webservice and I really need it to be as secure as I mentioned!

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• When is a C++ terminate handler the Right Thing(TM)?

  - by Joseph Garvin

  The C++ standard provides the std::set_terminate function which lets you specify what function std::terminate should actually call. std::terminate should only get called in dire circumstances, and sure enough the situations the standard describes for when it's called are dire (e.g. an uncaught exception). When std::terminate does get called the situation seems analagous to being out of memory -- there's not really much you can sensically do. I've read that it can be used to make sure resources are freed -- but for the majority of resources this should be handled automatically by the OS when the process exits (e.g. file handles). Theoretically I can see a case for if say, you needed to send a server a specific message when exiting due to a crash. But the majority of the time the OS handling should be sufficient. When is using a terminate handler the Right Thing(TM)? Update: People interested in what can be done with custom terminate handlers might find this non-portable trick useful.

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• Errors/warnings passing int/char arrays by reference

  - by Ankur Banerjee

  I'm working on a program where I try to pass parameters by reference. I'm trying to pass a 2D int array and a 1D char array by reference. Function prototype: void foo (int* (&a)[2][2], char* (&b)[4]) Function call: foo (a, b); However, when I compile the code with -ansi and -Wall flags on gcc, I get the following errors: foo.c: At top level: error: expected ‘)’ before ‘&’ token error: expected ‘;’, ‘,’ or ‘)’ before ‘char’ foo.c: In function ‘main’: error: too many arguments to function ‘foo’ I've stripped out the rest of the code of my program and concentrated on the bits which throw up the errors. I've searched around on StackOverflow and tried out different ways to pass the parameters, but none of them seem to work. (I took this way of passing parameters from the discussion on StackOverflow here.) Could you please tell me where I'm going wrong?

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• jquery plugin with multiple functions

  - by tcurdt

  According to the developer documentation jquery plugins are supposed to have only one namespace for all functions they make available. Which is straight forward as long as you only expose a single function per context (static/element). (function($){ var state_a = 0, $.myplugin = function(in_options) { // static return this; } $.fn.myplugin = function(in_options) { // element return this; } })(jQuery); This makes calls like this possible: $("elem").myplugin(options); jQuery.myplugin(options); What's the best approach if you have more than one function and need to share state? I would like to call into my plugin like this: $("elem").myplugin.start(options); $("elem").myplugin.stop(); jQuery.myplugin.start(options); jQuery.myplugin.stop();

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• Is NServiceBus suitable for general as well specific client notifications

  - by Pratik

  I am looking at various options for a WCF based publish subscribe framework. Say I have one WCF web service that will be the publisher and 1000 clients registered as subscriber. For some published messages all clients will be interested but at the same time I wish the ability to notify a single client with a specific message. On receiving notification the client will call other web service methods on the web service. Is NServiceBus suitable for this kind of scenario ? If I use MSMQ for transport does it mean that every PC where the client is installed requires a queue to be created ?

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• Adding childs to list of parents with jquery /mvc2

  - by John Landheer

  Hi, I have a table of products on my page, each product has zero or more colors, the colors are shown as a list beneath the product. After the colors I have a button to add a color. The button will do an ajax call with the parent product id to a controller which will return a JSON object with color information. My problem is where to store the product id in the DOM, should I put it in a hidden field and use jquery in the click event of the "add color" to get to it? What is the best way to do this? TIA, John EDIT: The page is initially rendered on the server so I don't want to use jquery to add the id's to the page.

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• Select only items in a specific DIV using HtmlAgilityPack

  - by Adam Haile

  I'm trying to use the HtmlAgilityPack to pull all of the links from a page that are contained within a div declared as <div class='content'> However, when I use the code below I simply get ALL links on the entire page. This doesn't really make sense to me since I am calling SelectNodes from the sub-node I selected earlier (which when viewed in the debugger only shows the HTML from that specific div). So, it's like it's going back to the very root node every time I call SelectNodes. The code I use is below: HtmlWeb hw = new HtmlWeb(); HtmlDocument doc = hw.Load(@"http://example.com"); HtmlNode node = doc.DocumentNode.SelectSingleNode("//div[@class='content']"); foreach(HtmlNode link in node.SelectNodes("//a[@href]")) { Console.WriteLine(link.Value); } Is this the expected behavior? And if so, how do I get it to do what I'm expecting?

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• UI Controls layer on top of operating system.

  - by Mason Blier

  I'm kind of curious about what layer writing a UI platform to the level of Win32 or the X Windowing System would fall in the grand scheme of an operating system. What layers below do they primarily make use of, is it heavily based on direct communication with the graphics card driver (I can't imagine going though a rendering pipeline like OpenGL for this), or is there a graphical platform as part of the operating system which extracts this out a little more. I'm also interested in the creation of shells and the like, and I"m particularly curious as to how people go about creating alternative shells for windows, what do people look for when figuring out what methods to call or what to hook into, etc? I guess I'm fairly lost at these concepts and finding it difficult to find documentation on them. I was initially excited to have taken Operating Systems in college but it was all low level resource management stuff. Thanks all, Mason

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• How to program asynchronous Windows Forms Applications?

  - by Nestor

  I'm writting a Windows Forms application in C# that performs a lot of long-running procedures. I need to program the application so that the GUI doesn't lock. What is the best way to program it? I know how to use the following: BeginInvoke/EndInvoke Calling Application.DoEvents() repeatedly (probably not a good idea) BackgroundWorker etc. But how to manage GUI state with call backs, etc... is not trivial. Are there solutions for this (in the form of patterns or libraries)?

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• Render only the segment/area of a circle that intersects the main circle

  - by Greenhouse Gases

  I absolutely love maths (or 'math' as most of you would say!) but I haven't done it to a level where I know the answer to this problem. I have a main circle which could have a centre point at any x and y on a display. Other circles will move around the display at will but at any given call to a render method I want to render not only those circles that intersect the main circle, but also only render the segment of that circle that is visible inside the main circle. An analogy would be a shadow cast on a real life object, and I only want to draw the part of that object that is 'illuminated'. I want to do this preferably in Java, but if you have a raw formula that would be appreciated. I wonder how one might draw the shape and fill it in Java, I'm sure there must be some variation on a polyline with arcs or something? Many thanks

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• NSNumber >= 13 won't retain. Everything else will.

  - by jkap

  The code I'm currently working on requires adding an NSNumber object to an array. All of the NSNumbers with value 0-12 are added fine, but 13 onward causes a EXC_BAD_ACCESS. I turned on NSZombieEnabled and am now getting *** -[CFNumber retain]: message sent to deallocated instance 0x3c78420. Here's the call stack: #0 0x01eac3a7 in ___forwarding___ #1 0x01e886c2 in __forwarding_prep_0___ #2 0x01e3f988 in CFRetain #3 0x01e4b586 in _CFArrayReplaceValues #4 0x0002a2f9 in -[NSCFArray insertObject:atIndex:] #5 0x0002a274 in -[NSCFArray addObject:] #6 0x00010a3b in -[Faves addObject:] at Faves.m:24 #7 0x000062ff in -[ShowController processFave] at ShowController.m:458 #8 0x002af405 in -[UIApplication sendAction:to:from:forEvent:] #9 0x00312b4e in -[UIControl sendAction:to:forEvent:] #10 0x00314d6f in -[UIControl(Internal) _sendActionsForEvents:withEvent:] #11 0x00313abb in -[UIControl touchesEnded:withEvent:] #12 0x002c8ddf in -[UIWindow _sendTouchesForEvent:] #13 0x002b27c8 in -[UIApplication sendEvent:] #14 0x002b9061 in _UIApplicationHandleEvent #15 0x02566d59 in PurpleEventCallback #16 0x01e83b80 in CFRunLoopRunSpecific #17 0x01e82c48 in CFRunLoopRunInMode #18 0x02565615 in GSEventRunModal #19 0x025656da in GSEventRun #20 0x002b9faf in UIApplicationMain #21 0x00002498 in main at main.m:14 If it wasn't isolated to NSNumbers of a certain range, I'd assume I screwed something up with my memory management, but I've just got no idea. Any ideas? Thanks, Josh

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• PHP and XSLTProcessor Misbehavior

  - by Aiden Bell

  Hi all, Simple question: Why is a PHP function called from an XSL Stylesheet just returning the last argument passed: foo.xsl: <xsl:template match="/"> <xsl:value-of select="php:function('date','c')" /> </xsl:template> PHP: ... $xsl = new XSLTProcessor(); $xsl->registerPHPFunctions(); $xsl->importStylesheet($fooStylesheet); echo $xsl->transformToXML($myXML); I Get the output c and if I call <xsl:value-of select="php:function('date')" /> I just get date as my output. Seems strange to me. Version info: PHP 5.3.2 libxslt Version 1.1.26 libxslt compiled against libxml Version 2.7.6 EXSLT enabled libexslt Version 1.1.26

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• Python lambda returning None instead of empty string

  - by yoshi

  I have the following lambda function: f = lambda x: x == None and '' or x It should return an empty string if it receives None as the argument, or the argument if it's not None. For example: >>> f(4) 4 >>> f(None) >>> If I call f(None) instead of getting an empty string I get None. I printed the type of what the function returned and I got NoneType. I was expecting string. type('') returns string, so I'd like to know why the lambda doesn't return an empty string when I pass None as an argument. I'm fairly new to lambdas so I might have misunderstood some things about how they work.

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• View controllers inside tab bar controller not auto-rotating

  - by Padawan

  In an iPad app, I have five regular view controllers (not navigation controllers or anything like that) inside a tab bar controller. The tab bar controller is just a plain UITabBarController declared in the app delegate. All the view controllers return YES in the shouldAutorotateToInterfaceOrientation method. On both the simulator and device, on rotation, the tab bar rotates properly but the currently selected view controller (call it A) does not. If I switch to another view controller B and then back to A (without rotating the device again), A appears correctly rotated. This happens with any of the five view controllers Why doesn't the currently selected view controller rotate and how do I fix it? Thanks.

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• jquery FullCalendar

  - by Andrei C

  hi guys, I'm trying to use jquery Full Calendar from http://arshaw.com/fullcalendar I searched the docs alot but I could not find how I can retrieve the current month a user is on at a certain moment. On render it is set as the current month in the title, but I cant find a way to use that info. I want to sent the month to my ajax call together with other params (start, end, _) but I dont know how please help me out with this. inside the fullcalendar definition, how to retrieve the month currently displayed. Thank you!

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