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  • Is there a floating point value of x, for which x-x == 0 is false?

    - by Andrew Walker
    In most cases, I understand that a floating point comparison test should be implemented using over a range of values (abs(x-y) < epsilon), but does self subtraction imply that the result will be zero? // can the assertion be triggered? float x = //?; assert( x-x == 0 ) My guess is that nan/inf might be special cases, but I'm more interested in what happens for simple values.

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  • VS2010 always relinks the project

    - by Rob Walker
    I am migrating a complex mixed C++/.NET solution from VS2008 to VS2010. The upgraded solution works in VS2010, but the build system is always refereshing one C++/CLI assembly. It doesn't recompile anything, but the linker touches the file. The causes a ripple effect downstream in the build as a whole bunch of dependent then get rebuilt. Any ideas on how to find out why it thinks it needs to relink the file? I've turned on verbose build logging, but nothing stands out.

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  • Create Embedded Resources problem

    - by Night Walker
    I am trying to add an Embedded Resource I am doing it like it is written in following tutorial http://msdn.microsoft.com/en-us/library/e2c9s1d7%28VS.80%29.aspx But I cant the Persistence property from Linked at compile time To Embedded in .resx It always gray at Linked at compile time . Any idea why i have this problem ? Thanks .

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  • AssociationTypeMismatch with Expected Type on Nested Model Forms

    - by Craig Walker
    I'm getting this exception when doing a nested model form: ActiveRecord::AssociationTypeMismatch in RecipesController#update Ingredient(#35624480) expected, got Ingredient(#34767560) The models involved are Recipe and Ingredient. Recipe has_many and accepts_nested_attributes_for :ingredients, which belongs_to :recipe. I get this exception when attempting to _destroy (=1) one of the preexisting Ingredients on a nested Ingredient form for the Recipe Edit/Update. This makes very little sense, mostly because the association types are as expected (by the exception's own admission). What makes even less sense is that it works just fine in a functional test. Any ideas what might be causing this, or what I should be looking for?

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  • Has form post behavior changed in modern browsers? (or How are double clicks handled by the browser)

    - by Alex Czarto
    Background: We are in the process of writing a registration/payment page, and our philosophy was to code all validation and error checking on the server side first, and then add client side validation as a second step (un-obstructive jQuery). We wanted to disable double clicks server side, so we wrote some locking, thread-safe code to handle simultaneous posts/race conditions. When we tried to test this, we realized that we could not cause a simultaneous post or race condition to occur. I thought that (in older browsers anyway) double clicking a submit button worked as follows: User double clicks submit button. Browser sends a post on the first click On the second click, browser cancels/ignores initial post, and initiates a second post (before the first post has returned with a response). Browser waits for second post to return, ignoring initial post response. I thought that from the server side it looked like this: Server gets two simultaneous post requests, executes and responds to them both (unaware that no one is listening to the first response). From our testing (FireFox 3.0, IE 8.0) this is what actually happens: User double clicks submit button Browser sends a post for the first click Browser queues up second click, but waits for the response from the first click. Response returns from first click (response is ignored?). Browser sends a post for the second click. So from a server side: Server receives a single post which it executes and responds to. Then, server receives a second request wich it executes and responds to. My question is, has this always worked this way (and I'm losing my mind)? Or is this a new feature in modern browsers that prevents simultaneous posts to be sent to the server? It seems that for server side double click prevention, we don't have to worry about simultaneous posts or race conditions. Only need to worry about queued up posts. Thanks in advance for any feedback / comments. Alex

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  • Best practices for querying an entire row in a database table? (MySQL / CodeIgniter)

    - by Walker
    Sorry for the novice question! I have a table called cities in which I have fields called id, name, xpos, ypos. I'm trying to use the data from each row to set a div's position and name. What I'm wondering is what's the best practice for dynamically querying an unknown amount of rows (I don't know how many cities there might be, I want to pull the information from all of them) and then passing the variables from the model into the view and then setting attributes with it? Right now I've 'hacked' a solution where I run a different function each time which pulls a value using a query ('SELECT id FROM cities;'), then I store that in a global array variable and pass it into view. I do this for each var so I have arrays called: city_idVar, city_nameVar, city_xposVar, city_yposVar then I know that the city_nameVar[0] matches up with city_xposVar[0] etc. Is there a better way?

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  • Rails Binary Stream support

    - by Craig Walker
    I'm going to be starting a project soon that requires support for large-ish binary files. I'd like to use Ruby on Rails for the webapp, but I'm concerned with the BLOB support. In my experience with other languages, frameworks, and databases, BLOBs are often overlooked and thus have poor, difficult, and/or buggy functionality. Does RoR spport BLOBs adequately? Are there any gotchas that creep up once you're already committed to Rails? BTW: I want to be using PostgreSQL and/or MySQL as the backend database. Obviously, BLOB support in the underlying database is important. For the moment, I want to avoid focusing on the DB's BLOB capabilities; I'm more interested in how Rails itself reacts. Ideally, Rails should be hiding the details of the database from me, and so I should be able to switch from one to the other. If this is not the case (ie: there's some problem with using Rails with a particular DB) then please do mention it. UPDATE: Also, I'm not just talking about ActiveRecord here. I'll need to handle binary files on the HTTP side (file upload effectively). That means getting access to the appropriate HTTP headers and streams via Rails. I've updated the question title and description to reflect this.

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  • Set default browser when debugging WPF?

    - by Albert Walker
    I'm using VWD Express 2008 to develop a WPF Browser Application. When I start debugging, it launches the XBAP in my default browser, which is Opera. Obviously, XBAPs don't work in Opera, so I have to repeatedly right-click on the document to open in IE. Is there any way to change the settings for PresentationHost.exe so that it always opens with IE? A registry setting, perhaps?

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  • SSIS - Multiple Configurations

    - by Mick Walker
    I have inherited a SSIS project. I have never worked with SSIS before, and the one thing that seems strange to me, is that there is no way to manage multiple configurations. For each SSIS package we have 3 delpoyment environments, DEV, UAT and PRODUCTION. At the moment I am having to edit the configuration for every package we deploy manually for each change (and there are a lot of packages). Does anyone know of a more graceful way to handle these configuration changes?

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  • UITableViewCell imageView images loading small even when they are the correct size!

    - by Alex Barlow
    Im having an issue whilst loading images into a UITableViewCell after an asynchronous download and placement into an UIImage variable.. The images appear smaller than they actually are! But when scrolled down and scrolled back up to the image, or the whole table is reloaded, they appear at the correct size... Here is a code excerpt... - (void)reviewImageDidLoad:(NSIndexPath *)indexPath { ThumbDownloader *thumbDownloader = [imageDownloadsInProgress objectForKey:indexPath]; if (thumbDownloader != nil) { UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:thumbDownloader.indexPathInTableView]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.4]; [self.tableView cellForRowAtIndexPath:indexPath].imageView.alpha = 0.0; [UIView commitAnimations]; cell.imageView.image = thumbDownloader.review.thumb; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.4]; [self.tableView cellForRowAtIndexPath:indexPath].imageView.alpha = 1.0; [UIView commitAnimations]; } } Here is an image of the app just after calling this method.. http://www.flickr.com/photos/arbarlow/5288563627/ After calling tableView reloadData or scrolling around the appear correctly, go the the next flickr image, to see the normal result, but im sure you can guess that.. Does anyone have an ideas as to make the images appear correctly? im absolutely stumped?! Regards, Alex iPhone noob

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  • TSQL Help (SQL Server 2005)

    - by Mick Walker
    I have been playing around with a quite complex SQL Statement for a few days, and have gotten most of it working correctly. I am having trouble with one last part, and was wondering if anyone could shed some light on the issue, as I have no idea why it isnt working: INSERT INTO ExistingClientsAccounts_IMPORT SELECT DISTINCT cca.AccountID, cca.SKBranch, cca.SKAccount, cca.SKName, cca.SKBase, cca.SyncStatus, cca.SKCCY, cca.ClientType, cca.GFCID, cca.GFPID, cca.SyncInput, cca.SyncUpdate, cca.LastUpdatedBy, cca.Deleted, cca.Branch_Account, cca.AccountTypeID FROM ClientsAccounts AS cca INNER JOIN (SELECT DISTINCT ClientAccount, SKAccount, SKDesc, SKBase, SKBranch, ClientType, SKStatus, GFCID, GFPID, Account_Open_Date, Account_Update FROM ClientsAccounts_IMPORT) AS ccai ON cca.Branch_Account = ccai.ClientAccount Table definitions follow: CREATE TABLE [dbo].[ExistingClientsAccounts_IMPORT]( [AccountID] [int] NOT NULL, [SKBranch] [varchar](2) NOT NULL, [SKAccount] [varchar](12) NOT NULL, [SKName] [varchar](255) NULL, [SKBase] [varchar](16) NULL, [SyncStatus] [varchar](50) NULL, [SKCCY] [varchar](5) NULL, [ClientType] [varchar](50) NULL, [GFCID] [varchar](10) NULL, [GFPID] [varchar](10) NULL, [SyncInput] [smalldatetime] NULL, [SyncUpdate] [smalldatetime] NULL, [LastUpdatedBy] [varchar](50) NOT NULL, [Deleted] [tinyint] NOT NULL, [Branch_Account] [varchar](16) NOT NULL, [AccountTypeID] [int] NOT NULL ) ON [PRIMARY] CREATE TABLE [dbo].[ClientsAccounts_IMPORT]( [NEWClientIndex] [bigint] NOT NULL, [ClientGroup] [varchar](255) NOT NULL, [ClientAccount] [varchar](255) NOT NULL, [SKAccount] [varchar](255) NOT NULL, [SKDesc] [varchar](255) NOT NULL, [SKBase] [varchar](10) NULL, [SKBranch] [varchar](2) NOT NULL, [ClientType] [varchar](255) NOT NULL, [SKStatus] [varchar](255) NOT NULL, [GFCID] [varchar](255) NULL, [GFPID] [varchar](255) NULL, [Account_Open_Date] [smalldatetime] NULL, [Account_Update] [smalldatetime] NULL, [SKType] [varchar](255) NOT NULL ) ON [PRIMARY] The error message I get is: Msg 8152, Level 16, State 14, Line 1 String or binary data would be truncated. The statement has been terminated.

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  • datetime command line argument in python 2.4

    - by Ike Walker
    I want to pass a datetime value into my python script on the command line. My first idea was to use optparse and pass the value in as a string, then use datetime.strptime to convert it to a datetime. This works fine on my machine (python 2.6), but I also need to run this script on machines that are running python 2.4, which doesn't have datetime.strptime. How can I pass the datetime value to the script in python 2.4? Here's the code I'm using in 2.6: parser = optparse.OptionParser() parser.add_option("-m", "--max_timestamp", dest="max_timestamp", help="only aggregate items older than MAX_TIMESTAMP", metavar="MAX_TIMESTAMP(YYYY-MM-DD HH24:MM)") options,args = parser.parse_args() if options.max_timestamp: # Try parsing the date argument try: max_timestamp = datetime.datetime.strptime(options.max_timestamp, "%Y-%m-%d %H:%M") except: print "Error parsing date input:",sys.exc_info() sys.exit(1)

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  • how i can check if this header exists ?

    - by Night Walker
    I am trying to check in my xml file if HeaderReportUnit exists, how i can check if this Header exists ? I am using 2.0 assembly , really thanks for help <?xml version="1.0" encoding="UTF-8" ?> - <HeadReportUnit> - <Title> <ModuleNum>ModuleNum</ModuleNum> <hdstSetPos>hdstSetPos</hdstSetPos> <hdstNzlName>hdstNzlName</hdstNzlName> <nzavSpecName>nzavSpecName</nzavSpecName> <nzavNzlDiameter>nzavNzlDiameter</nzavNzlDiameter> <nzavNzlSizeX>nzavNzlSizeX</nzavNzlSizeX> <nzavNzlSizeY>nzavNzlSizeY</nzavNzlSizeY> <nzavNzlType2>nzavNzlType2</nzavNzlType2> </Title> - <Unit> <ModuleNum>1</ModuleNum> <hdstSetPos>1- 1</hdstSetPos> <hdstNzlName>R07-007-070</hdstNzlName> <nzavSpecName>AA05700</nzavSpecName> <nzavNzlDiameter>0.0</nzavNzlDiameter> <nzavNzlSizeX>0.7</nzavNzlSizeX> <nzavNzlSizeY>0.6</nzavNzlSizeY> <nzavNzlType2>Standard</nzavNzlType2> </Unit> - <Unit> <ModuleNum>1</ModuleNum> <hdstSetPos>1- 2</hdstSetPos> <hdstNzlName>R07-007-070</hdstNzlName> <nzavSpecName>AA05700</nzavSpecName> <nzavNzlDiameter>0.0</nzavNzlDiameter> <nzavNzlSizeX>0.7</nzavNzlSizeX> <nzavNzlSizeY>0.6</nzavNzlSizeY> <nzavNzlType2>Standard</nzavNzlType2> </Unit> - <Unit> <ModuleNum>1</ModuleNum> <hdstSetPos>1- 3</hdstSetPos> <hdstNzlName>R07-007-070</hdstNzlName> <nzavSpecName>AA05700</nzavSpecName> <nzavNzlDiameter>0.0</nzavNzlDiameter> <nzavNzlSizeX>0.7</nzavNzlSizeX> <nzavNzlSizeY>0.6</nzavNzlSizeY> <nzavNzlType2>Standard</nzavNzlType2> </Unit> - <Unit> <ModuleNum>1</ModuleNum> <hdstSetPos>1- 4</hdstSetPos> <hdstNzlName>R07-007-070</hdstNzlName> <nzavSpecName>AA05700</nzavSpecName> <nzavNzlDiameter>0.0</nzavNzlDiameter> <nzavNzlSizeX>0.7</nzavNzlSizeX> <nzavNzlSizeY>0.6</nzavNzlSizeY> <nzavNzlType2>Standard</nzavNzlType2> </Unit> - <Unit> <ModuleNum>1</ModuleNum> <hdstSetPos>1- 5</hdstSetPos> <hdstNzlName>R07-007-070</hdstNzlName> <nzavSpecName>AA05700</nzavSpecName> <nzavNzlDiameter>0.0</nzavNzlDiameter> <nzavNzlSizeX>0.7</nzavNzlSizeX> <nzavNzlSizeY>0.6</nzavNzlSizeY> <nzavNzlType2>Standard</nzavNzlType2> </Unit> - <Unit> <ModuleNum>1</ModuleNum> <hdstSetPos>1- 6</hdstSetPos> <hdstNzlName>R07-007-070</hdstNzlName> <nzavSpecName>AA05700</nzavSpecName> <nzavNzlDiameter>0.0</nzavNzlDiameter> <nzavNzlSizeX>0.7</nzavNzlSizeX> <nzavNzlSizeY>0.6</nzavNzlSizeY> <nzavNzlType2>Standard</nzavNzlType2> </Unit> - <Unit> <ModuleNum>1</ModuleNum> <hdstSetPos>1- 7</hdstSetPos> <hdstNzlName>R07-007-070</hdstNzlName> <nzavSpecName>AA05700</nzavSpecName> <nzavNzlDiameter>0.0</nzavNzlDiameter> <nzavNzlSizeX>0.7</nzavNzlSizeX> <nzavNzlSizeY>0.6</nzavNzlSizeY> <nzavNzlType2>Standard</nzavNzlType2> </Unit> - <Unit> <ModuleNum>1</ModuleNum> <hdstSetPos>1- 8</hdstSetPos> <hdstNzlName>R07-007-070</hdstNzlName> <nzavSpecName>AA05700</nzavSpecName> <nzavNzlDiameter>0.0</nzavNzlDiameter> <nzavNzlSizeX>0.7</nzavNzlSizeX> <nzavNzlSizeY>0.6</nzavNzlSizeY> <nzavNzlType2>Standard</nzavNzlType2> </Unit> - <Unit> <ModuleNum>1</ModuleNum> <hdstSetPos>1- 9</hdstSetPos> <hdstNzlName>R07-007-070</hdstNzlName> <nzavSpecName>AA05700</nzavSpecName> <nzavNzlDiameter>0.0</nzavNzlDiameter> <nzavNzlSizeX>0.7</nzavNzlSizeX> <nzavNzlSizeY>0.6</nzavNzlSizeY> <nzavNzlType2>Standard</nzavNzlType2> </Unit> - <Unit> <ModuleNum>1</ModuleNum> <hdstSetPos>1- 10</hdstSetPos> <hdstNzlName>R07-007-070</hdstNzlName> <nzavSpecName>AA05700</nzavSpecName> <nzavNzlDiameter>0.0</nzavNzlDiameter> <nzavNzlSizeX>0.7</ nzavNzlSizeX

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  • Compile a shared library statically

    - by Simon Walker
    I've got a shared library with some homemade functions, which I compile into my other programs, but I have to link the end program with all the libraries I have used to compile the static library. Here is an example: I have function foo in the library which requires a function from another library libbar.so. In my main program to use function foo I have to compile it with the -lbar flag. Is there a way I can compile my library statically so it includes all the required code from the other libraries, and I can compile my end program without needing the -lbar flag? Cheers

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  • Panel widget overlapping other contents in android

    - by walker
    I'm trying to utilize the Panel widget introduced in android-misc-widgets. It's been good so far. Now the problem is the sliding panel overlaps my top menu bar. For clarification look at the following screenshots. This is when I open panel using drag gesture (no problem here): This is when I open the panel with a single tap (look at the icons overlapping the top menu): There is one other problem, If there is any content inside the activity, opening the panel pushes that content out of the screen!

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  • AI navigation around a 2d map - Avoiding obstacles.

    - by Curt Walker
    Hey there, I know my question seems pretty vague but I can't think of a better way to put it so I'll start off by explaining what I'm trying to do. I'm currently working on a project whereby I've been given a map and I'm coding a 'Critter' that should be able to navigate it's way around the map, the critter has various other functions but are not relevant to the current question. The whole program and solution is being written in C#. I can control the speed of the critter, and retrieve it's current location on the map by returning it's current X and Y position, I can also set it's direction when it collides with the terrain that blocks it. The only problem I have is that I can't think of a way to intelligently navigate my way around the map, so far I've been basing it around what direction the critter is facing when it collides with the terrain, and this is in no way a good way of moving around the map! I'm not a games programmer, and this is for a software assignment, so I have no clue on AI techniques. All I am after is a push in the right direction on how I could go about getting this critter to find it's way around any map given to me. Here's an image of the map and critters to give you an idea of what i'm talking about. Here's a link to an image of what the maps and critters look like. Map and Critter image I'm in no way looking for anyone to give me a full solution, just a push in the general direction on map navigation. Thanks in advance!

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  • Modifying association arrays on cloned ActiveRecord objects

    - by Craig Walker
    I have an ActiveRecord model class Foo that has_many Bar. I want to clone a Foo (to get duplicates of most of its attributes) and then modify its Bar instances. This is a problem because cloned ActiveRecord instances share the same associated array; changes to one affect the other. f1 = Foo.new b = Bar.new f1.bars << b f2 = f1.clone f2.bars.includes? b # true f1.bars.clear f2.bars.includes? b # now false The real problem is that I can't detach the bars arrays from either Foo: f1.bars << b f2.bars.includes? b # true f2.bars = [] f2.bars.includes? b # now false f1.bars.includes? b # now also false If I could do that, then I could replace the Bars as I wanted to. However, any change to one Foo seems to affect the other.

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  • Assemble an image browser side with JavaScript or Flash?

    - by Kris Walker
    Would it be possible to assemble an image on the browser by 'concatenating' other downloaded images together? The use case is this. The page will display 36 different tiles (small images). The user should be able to arrange those tiles into a 6 x 6 grid and save the resulting grid to disk as an image. The best solution would be to do it all in the browser without Flash. The next best solution would be to allow the user to create the grid in the browser with simple JavaScript drag and drop functionality and then send the coordinates to the server for image processing. The last solution would be to do it all in the browser with Flash. Is it even possible for Flash to create an image and then allow the user to save it from the browser? I am familiar with the Pixastic JavaScript library ( http://www.pixastic.com/ ), but it relies on getting image data to and from a canvas element which is not very well supported. What if I send the tile images to the browser as base64 encoded strings? Could I use JavaScript to create the 6 x 6 grid image? And if so, is there some way of allowing the user to get it onto disk without relying on the canvas element?

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  • pass other form elements to ajax suggestion box script

    - by Alex Calder
    I paid somebody to build me a jQuery AJAX suggestion box script a while back. It works great. Now I'm trying to learn about it enough to modify it to do something different. Right now, the script that generates the suggestions just takes the query text and does the same check every time. Now, I want to be able to pass along additional info so different things are looked for with each instance of a search box. The HTML... simple, obvious. input class="suggest" name="q" type="text" autocomplete="off" / The jQuery looks like this: jQuery(document).ready(function() { $('.suggest').autocomplete( { source:'output.php', minLength:3, focus: function (event, ui) { $(event.target).val(ui.item.label); return false; } } ); [snip] } Instead of: source:'output.php', minLength:3, I'd like: source:'output.php?arg1=blah1&arg2=blah2', minLength:3, where arg1 and arg2 are passed along in the form... input class="suggest" name="q" type="text" autocomplete="off" / input type="hidden" name="arg1" value="blah1" input type="hidden" name="arg2" value="blah2" Does this make sense? Thanks guys. I know just about "this much" about OOL's and javascript, so I'm learning... Alex

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  • Sphinx autodoc is not automatic enough

    - by Cory Walker
    I'm trying to use Sphinx to document a 5,000+ line project in Python. It has about 7 base modules. As far as I know, In order to use autodoc I need to write code like this for each file in my project: .. automodule:: mods.set.tests :members: :show-inheritance: This is way too tedious because I have many files. It would be much easier if I could just specify that I wanted the 'mods' module to be documented. Sphinx could then recursively go through the module and make a page for each submodule. Is there A feature like this? If not I could write a script to make all the .rst files, but that would take up a lot of time.

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  • SSIS - 'Execute SQL' Task and Record Sets

    - by Mick Walker
    Hi, How can I access a 'RecordSet' within a 'Execute SQL' task when using SSIS? I have looked at the parameter mapping options within the Execute SQL Task Editor and cannot find a type of object to allow me to pass the variable holding my record set to the task.

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