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  • How do I know if a drag/drop has been cancelled in WPF

    - by Jon Mitchell
    I'm writing a user control in WPF which is based on a ListBox. One of the main pieces of functionality is the ability to reorder the list by dragging the items around. When a user drags an item I change the items Opacity to 50% and physically move the item in an ObservableCollection in my ViewModel depending on where the user wants it. On the drop event I change the Opacity back to 100%. The problem I've got is that if the user drags the item off my control and drops it somewhere else then I need to change the Opacity back to 100% and move the item back to where it was when the user started the drag. Is there an event I can handle to capture this action? If not is there any other cunning way to solve this problem?

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  • mySQL Inconsistent Performance

    - by Jon Hatfield
    Hi, I'm running a mySQL query that joins various tables of 500,000+ rows. Sometimes it takes a second, other times around 15 seconds! This is on my local machine. I have experienced similarly varied times before on other intensive queries, does anyone know why this is? Thanks

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  • How can I speed up line by line reading of an ASCII file? (C++)

    - by Jon
    Here's a bit of code that is a considerable bottleneck after doing some measuring: //----------------------------------------------------------------------------- // Construct dictionary hash set from dictionary file //----------------------------------------------------------------------------- void constructDictionary(unordered_set<string> &dict) { ifstream wordListFile; wordListFile.open("dictionary.txt"); string word; while( wordListFile >> word ) { if( !word.empty() ) { dict.insert(word); } } wordListFile.close(); } I'm reading in ~200,000 words and this takes about 240 ms on my machine. Is the use of ifstream here efficient? Can I do better? I'm reading about mmap() implementations but I'm not understanding them 100%. The input file is simply text strings with *nix line terminations.

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  • How do I dynamically point an interface to a specific class at runtime?

    - by Jon
    As a simple example, I have an xml file with a list of names of classes which actually carry out the work and all implement interface IDoWork with a method Process(). I loop through the items in the xml file. How do I actually dynamically assign the class to the interface from a string name? e.g. var IDoWork = new "DoWorkType1"(); IDoWork.Process(); <work> <item id="DoWorkType1"> </item> <item id="DoWorkType2"> </item> </work> I want to achieve a plugin type architecture, except the plugin isn't at an assembly level only a class level within my program.

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  • Creating a Non-Databound Report in Winforms

    - by Jon
    I am using Visual Studio 2008 and all the components that come with it as well as Infragisitics for Winforms. I need to design a label that will print to a label printer. None of the controls are databound and will most likely be set in code eg/Label.Text = "My Heading"; as there will be minimal information on the label. One piece of information is a barcode so I need the functionality to do that, I assume I can just set the font of the label to barcode and it will do its thing. Can I just add a Crystal Report to a form design it, set the label text properties in code, tell it what printer to print to and then call report.Print(); I've had a quick go and seems not as easy as I thought. Thanks

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  • WPF XAML Bind Grid

    - by Jon Archway
    I have a custom user control that is based on a Grid control. I have a ViewModel that exposes this as a property. I would like the XAML on the view to bind to this. I am sure this must be easy but I am quite new to WPF. How is this achieved? Many thanks in advance

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  • Visual Studio 2008 error while debugging an app with "uiAccess=true" in the manifest

    - by Jon Tackabury
    I have a C# WinForms application that has "uiAccess" set to "True" in it's manifest file. When I try to start/debug it in Visual Studio 2008 SP1 under Windows 7 x64 (RTM) I get this error: Running an Accessibility application requires following the steps described in Help. The help button is a broken link, and clicking ok just closes the application. It is digitally signed, and I can start it just fine in Windows Explorer. Here is the same bug in MS Connect, but unfortunately it's closed: https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=384183 Question: Can anyone else using Vista/Win7 x64 (with UAC enabled) confirm that they experience the same problem? Has anyone seen this problem before and have any idea how to work around it?

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  • How do I convert a System::IO::Stream^ to an LPCSTR for PlaySound?

    - by Jon Cage
    I'm trying to embed and then play back a .wav file in a C++/CLI app but all the examples I've seen which use PlaySound are in VB. I can't see how to get froma Stream^ to the LPCSTR which PlaySound requires: System::IO::Stream^ s = Assembly::GetExecutingAssembly()->GetManifestResourceStream ("Ping.wav"); LPCSTR buf = s->????; PlaySound(buf, NULL, SND_ASYNC|SND_MEMORY|SND_NOWAIT); I guess I need some sort of horrible .net memory conversion magic.

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  • Only show certain items in a mysql database using php and time()

    - by Jon
    Is there a way to only show the items that are older than a certain date in a php mysql array? I'm using this query method and sorting by lastpost_cl: $query="SELECT * FROM properties ORDER BY lastpost_cl"; $result=mysql_query($query); $num = mysql_num_rows ($result); mysql_close(); and I was thinking the way of checking the time would be: if (time() <= strtotime($lastpost_cl)) { } How can I combine the two and only show lastpost_cl that are older that the current time?

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  • Return NSArray from NSDictionary

    - by Jon
    I have a fetch that returns an array with dictionary in it of an attribute of a core data object. Here is my previous question: Create Array From Attribute of NSObject From NSFetchResultsController This is the fetch: NSFetchRequest *request = [[NSFetchRequest alloc] init]; [request setEntity:entity]; [request setResultType:NSDictionaryResultType]; [request setReturnsDistinctResults:NO]; //set to YES if you only want unique values of the property [request setPropertiesToFetch :[NSArray arrayWithObject:@"timeStamp"]]; //name(s) of properties you want to fetch // Execute the fetch. NSError *error; NSArray *objects = [managedObjectContext executeFetchRequest:request error:&error]; When I log the NSArray data, I get this: The content of data is( { timeStamp = "2011-06-14 21:30:03 +0000"; }, { timeStamp = "2011-06-16 21:00:18 +0000"; }, { timeStamp = "2011-06-11 21:00:18 +0000"; }, { timeStamp = "2011-06-23 19:53:35 +0000"; }, { timeStamp = "2011-06-21 19:53:35 +0000"; } ) What I want is an array with this format: [NSArray arrayWithObjects: @"2011-11-01 00:00:00 +0000", @"2011-12-01 00:00:00 +0000", nil];' Edit: This is the method for which I want to replace the data array with my new data array: - (NSArray*)calendarMonthView:(TKCalendarMonthView *)monthView marksFromDate:(NSDate *)startDate toDate:(NSDate *)lastDate { NSLog(@"calendarMonthView marksFromDate toDate"); NSLog(@"Make sure to update 'data' variable to pull from CoreData, website, User Defaults, or some other source."); // When testing initially you will have to update the dates in this array so they are visible at the // time frame you are testing the code. NSArray *data = [NSArray arrayWithObjects: @"2011-01-01 00:00:00 +0000", @"2011-12-01 00:00:00 +0000", nil]; // Initialise empty marks array, this will be populated with TRUE/FALSE in order for each day a marker should be placed on. NSMutableArray *marks = [NSMutableArray array]; // Initialise calendar to current type and set the timezone to never have daylight saving NSCalendar *cal = [NSCalendar currentCalendar]; [cal setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]]; // Construct DateComponents based on startDate so the iterating date can be created. // Its massively important to do this assigning via the NSCalendar and NSDateComponents because of daylight saving has been removed // with the timezone that was set above. If you just used "startDate" directly (ie, NSDate *date = startDate;) as the first // iterating date then times would go up and down based on daylight savings. NSDateComponents *comp = [cal components:(NSMonthCalendarUnit | NSMinuteCalendarUnit | NSYearCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit | NSSecondCalendarUnit) fromDate:startDate]; NSDate *d = [cal dateFromComponents:comp]; // Init offset components to increment days in the loop by one each time NSDateComponents *offsetComponents = [[NSDateComponents alloc] init]; [offsetComponents setDay:1]; // for each date between start date and end date check if they exist in the data array while (YES) { // Is the date beyond the last date? If so, exit the loop. // NSOrderedDescending = the left value is greater than the right if ([d compare:lastDate] == NSOrderedDescending) { break; } // If the date is in the data array, add it to the marks array, else don't if ([data containsObject:[d description]]) { [marks addObject:[NSNumber numberWithBool:YES]]; } else { [marks addObject:[NSNumber numberWithBool:NO]]; } // Increment day using offset components (ie, 1 day in this instance) d = [cal dateByAddingComponents:offsetComponents toDate:d options:0]; } [offsetComponents release]; return [NSArray arrayWithArray:marks]; }

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  • intrusive_ptr: Why isn't a common base class provided?

    - by Jon
    intrusive_ptr requires intrusive_ptr_add_ref and intrusive_ptr_release to be defined. Why isn't a base class provided which will do this? There is an example here: http://lists.boost.org/Archives/boost/2004/06/66957.php, but the poster says "I don't necessarily think this is a good idea". Why not?

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  • creating existing users on AWS when they don't have a group

    - by Jon Strayer
    It seems when chef creates a user with the id of "foobar" it also creates a group with the id of "foobar". AWS doesn't do that. So, when I run my create users script via Opsworks it blows up on the first user that already exists because the group doesn't. I thought there was a way to say create the user but not the group, but I can't find it. What's the best way to solve this problem? Can I: Tell chef to not create the user's group? Tell chef to create it if the user exists but the group doesn't? Write a script that finds the existing users and creates groups for them? Something else?

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  • jQuery animate element reveal - bottom to top

    - by Jon Hadley
    I'm trying to animate a horizontal lists appearance. It's a top navigation bar. The following works pretty well, but it animates in from the top (of, I assume, the ul) to the bottom. How would animate bottom, up? $("#topnavigation li").css({height:'0'}); // 'hide' it first $("#topnavigation li", this).stop().animate({height:'23px'},{queue:false,duration:1000});

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  • Set a C++ bitset from a binary input steam

    - by Jon
    I have an input stream from a binary file. I want to create a bitset for the first 5 bits of the stream. Here is the code I have so far: ifstream is; is.open ("bin_file.out", ios::binary ); bitset<5> first_five_bits; is >> first_five_bits; // always is set to default 00000

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  • Automating Excel through the PIA makes VBA go squiffy.

    - by Jon Artus
    I have absolutely no idea how to start diagnosing this, and just wondered if anyone had any suggestions. I'm generating an Excel spreadsheet by calling some Macros from a C# application, and during the generation process it somehow breaks. I've got a VBA class containing all of my logging/error-handling logic, which I instantiate using a singleton-esque accessor, shown here: Private mcAppFramework As csys_ApplicationFramework Public Function AppFramework() As csys_ApplicationFramework If mcAppFramework Is Nothing Then Set mcAppFramework = New csys_ApplicationFramework Call mcAppFramework.bInitialise End If Set AppFramework = mcAppFramework End Function The above code works fine before I've generated the spreadsheet, but afterwards fails. The problem seems to be the following line; Set mcAppFramework = New csys_ApplicationFramework which I've never seen fail before. If I add a watch to the variable being assigned here, the type shows as csys_ApplicationFramework/wksFoo, where wksFoo is a random worksheet in the same workbook. What seems to be happening is that while the variable is of the right type, rather than filling that slot with a new instance of my framework class, it's making it point to an existing worksheet instead, the equivalent of Set mcAppFramework = wksFoo which is a compiler error, as one might expect. Even more bizarrely, if I put a breakpoint on the offending line, edit the line, and then resume execution, it works. For example, I delete the word 'New' move off the line, move back, re-type 'New' and resume execution. This somehow 'fixes' the workbook and it works happily ever after, with the type of the variable in my watch window showing as csys_ApplicationFramework/csys_ApplicationFramework as I'd expect. This implies that manipulating the workbook through the PIA is somehow breaking it temporarily. All I'm doing in the PIA is opening the workbook, calling several macros using Excel.Application.Run(), and saving it again. I can post a few more details if anyone thinks that it's relevant. I don't know how VBA creates objects behind the scenes or how to debug this. I also don't know how the way the code executes can change without the code itself changing. As previously mentioned, VBA has frankly gone a bit squiffy on me... Any thoughts?

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  • Is it possible to use the CommonJS libraries yet?

    - by Jon Winstanley
    I am interested in getting started with CommonJS. With JavaScript frameworks getting faster all the time, and parsing engines and compilers making JavaScript incredibly quick, it is surprising that a project such as CommonJS has not been initiated sooner. What steps are involved in getting a test project up and running with what has been created so far?

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  • Getting a stream back from a .Net remoting service that is accessible with IP v4 and v6

    - by jon.ediger
    My company has an existing .Net Remoting service that listens on a port, fronting interfaces used by external systems. This all works great with IP v4 based communications. However, this service now needs to support both IP v4 communications and IP v6 communications. I have found info that the system.runtime.remoting section of the app.config should include two channels as follows: <channel ref="tcp" name="tcp6" port="9000" bindTo="[::]" /> <channel ref="tcp" name="tcp4" port="9000" bindTo="0.0.0.0" /> The above config file changes to the System.Runtime.Remoting config section will get the remoting service responding to non-stream functions on both ip v4 and ip v6. The issue comes only when attempting to get a stream back, used to upload or download large files. In this case, instead of getting a usable stream back, the following ArgumentException is thrown instead: IPv4 address 0.0.0.0 and IPv6 address ::0 are unspecified addresses that cannot be used as a target address. Parameter name: hostNameOrAddress Is there a way to modify the app.config (in the system.runtime.remoting section, or another section) so that the service will return a stream mapped to a real ip so the client can actually upload/download files while maintaining the ability to use both IP v4 and IP v6?

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  • MVC Html.DropDownList closes prematurely in IE7

    - by Jon
    I'm using ASP.NET MVC with jquery. I have a couple of dropdownlists. When I select one via mouse click and then scroll down over the items using the mouse/cursor, the list closes before a selection can be made, before the mouse can be clicked. This doesn't happen when I open them and then up/down arrow to select an item. It doesn't happen all of the time, but a lot. Just to try something different, I added a jquery "select" control with hardcoded values (options) and it displays the same behavior. Any ideas? <%: Html.DropDownList("Accounts", (IEnumerable)ViewData["Accounts"], "-- Select an account --")% Thank you

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  • How can I extract the current user's account picture?

    - by Jon Tackabury
    I am trying to extract the current user's account picture in Windows 7, but I can't seem to figure out where it is located. I have found that the picture is sometimes written to the User's temp folder, but only after performing certain actions. It isn't always guaranteed to be there. Has anyone had any luck extracting this image? Thanks!

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  • Bind event in custom WPF control to command in ViewModel

    - by Jon Archway
    Hi, I have a custom control that has an event. I have a window using that custom control. The window is bound to a viewmodel. I would like to have the event from the custom control direct to an ICommand on my viewmodel. I am obviously being dense here as I can't figure out how to do this. Any assistance is most welcome. Thanks

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  • How can I load an MP3 or similar music file for display and anaysis in wxWdigets?

    - by Jon Cage
    I'm developing a GUI in wxPython which allows a user to generate sequences of colours for some toys I'm building. Part of the program needs to load an MP3 (and potentially other formats further down the line) and display it to the user. That shuold be sufficient to get started but later I'd like to add features like identifying beats and some crude frequency analysis. Is there any simple way of loading / understanding an MP3's contents to display a plot of it's amplitudes to the screen using wxWidgets? I later intend to port to C++/wxWidgets for speed and to avoid having to distribute wxPython.

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