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• Which is the best .NET image capture API for me to use?

  - by David

  I have been tasked with integrating image acquisition into a .NET application and I have been looking for an API to use for performing this function. I have come across several "standard" APIs, some have been in existence for a long time, some not so long. I have looked at references to ISIS, TWAIN, WIA, and SANE (said to be mostly *nix). They all appear to be Win32 libraries except for SANE, and I was wondering what the current recommendations are for talking to image acquisition devices (scanners)? Feel free to recommend something else if you feel it is better. I'm looking for open source options. Edit: I put open source, when what I actually meant was free. using WIA or TWAIN is fine since they are free even though they are proprietary interfaces.

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• How does this ruby custom accessor work

  - by ennuikiller

  So the method below in class_eval dynamically creates accessors for attributes defined at runtime. It can be used, for example, to create configuration objects with attributes read from a config file (and unknown until runtime). I understanding all of it except for the else branch. If I am correct the else branch returns the attribute value (val[0]) if there is one value passed in *val. However the way its written I would expect it to return an array (val) if there is more then one value passed in *var. In particular, if I have something like the following: value = 5 then from reading the code I would expect "#{@value}" to be [=,5]. However "#{@value}" returns 5 and not the array [=,5]. How is this possible? class Module def dsl_accessor(*symbols) symbols.each do |sym| class_eval %{ def #{sym}(*val) if val.empty? @#{sym} else @#{sym} = val.size == 1 ? val[0] : val end end } end end end

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• Customizing RadioSelect

  - by Kugel

  Hello I have a form with ChoiceField whose widget is set to RadioSelect Now to override default html output one needs to subclass RadioFieldRenderer like this: class SimpleRadioFieldRenderer(forms.widgets.RadioFieldRenderer): def render(self): """Outputs widget without <ul> or <li> tags.""" return mark_safe(u'\n'.join([u'%s' % force_unicode(w.tag()) for w in self])) All is good now except I'd like to be able to render 1 radio button at a time from template. Something like this: {{ form.myfield.0 }}} Or perhaps hanging it onto widget itself: {{ form.myfield.field.widget.0 }} What bugs me is that RadioFieldRenderer already implements __get_item__ to get just one RadioInput. The problem is that the renderer does not contain data, neither does the widget. And I'd really hate to mess with Field and BoundField. I need this to inject html before/after each radiobutton and I'd like it to be done in the template. From the code it would be easy. Any ideas are welcome.

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• rails nested attributes

  - by user342798

  I am using rails 3.0.0.beta3 and I am trying to implement form with nested attributes using :accepts_nested_attributes_for. My form is nested to three levels: Survey Question Answer. Survey has_many Questions, and Question has many Answers. Inside the Survey model, there is :accepts_nested_attributes_for :questions and inside the question mode, there is :accepts_nested_attributes_for :answers Everything is working fine except when I add a new answer to an existing question, it doesn't get created. However, if I make changes to the corresponding question while creating the answer, I can successfully create the answer. This example is exactly similar to a railscast: http://railscasts.com/episodes/197-nested-model-form-part-2 but doesn't work in rails3 (at least in my case). Please let me know if there is any issue with nested attributes in Rails 3. Thanks in advance.

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• Configuring log4net appenders via XML file *and* code

  - by Dave

  I started to play with log4net today and so far, I really like it. In order to preserve our current logging functionality, the app needs to create a new log file whenever the application is started. The log file name has the date and time stamp encoded in it. Currently, I've got log4net configured via an XmlConfigurator, which works great, except that the filename for my RollingFileAppender is hardcoded in the configuration XML file. I'd like to continue to use the XmlConfigurator, but after calling Configure(), I want to get at the RollingFileAppender and, in code, change its file value to be a dynamically-generated string. The sample documentation online seems to be down right now, but I've poked through the SDK reference, and it looks like I could use the Heirarchy and GetAppenders() to do what I need to do. Am I on the right track?

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• Base-camp Style Subdomains and IDs of Models

  - by Newy

  I have an app that has Basecamp-style subdomains, that is, I have Projects, Users, Apples and Oranges. The Users, Apples and Oranges are all keyed to a Project and only exist in the http://project.myapp.com. I added a project_id to Users, Apples and Oranges and everything works, except of course that the ids of those three objects increment globally, and throughout my app I lookup objects by that id. This doesn't seem like best practice. Should I instead do lookups by a secondary key? How does that affect efficiency? If there's a good blog post that covers this, would be wesome.

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• $().mouseMove <-- Empty selector in jQuery 1.4

  - by Matrym

  The following bit of code breaks in the upgrade to jquery 1.4: $().mousemove( function (e) { defaults.mouseX = e.pageX; defaults.mouseY = e.pageY; }); }; What appeared to be a reasonable fix was adding "html" as the selector, ex: $("html"). The fix works fine - except now when the user mouses off the page, it doesn't register the mouse position beyond the boundaries. When attempting to use the mouse position for a drag, for example, the amount of movement beyond the screen is really important. Anyone got any ideas? Thanks in advance.

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• Apache not loading Xdebug, but does when started from the Command Line

  - by JamesD

  I know that this sounds odd, but believe me, it's what is happening. Here are my system settings: Windows7 Apache 2.2 PHP 5.2.12 Xdebug 2.0.5 I have XDebug configured in my PHP.ini file. When I run php -m, I do in fact see that Xdebug is loaded. Now, if I start Apache AS A SERVICE (or by the Apache Monitor), and run phpinfo(), it is NOT showing Xdebug as being loaded. However, (now here's the crazy part), if I go to my Apache bin directory, and simply run httpd.exe, and then go and look at phpinfo(), Xdebug now shows as being loaded! Also, comparing some phpinfo() when started via service or by command line, it looks like the php.ini file is the same for either case. Everything looks the same except for the Xdebug being loaded part. Please, if you have any ideas it would be greatly appreciated.

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• How do I set a default page in Pylons?

  - by Evgeny

  I've created a new Pylons application and added a controller ("main.py") with a template ("index.mako"). Now the URL http://myserver/main/index works. How do I make this the default page, ie. the one returned when I browse to http://myserver/ ? I've already added a default route in routing.py: def make_map(): """Create, configure and return the routes Mapper""" map = Mapper(directory=config['pylons.paths']['controllers'], always_scan=config['debug']) map.minimization = False # The ErrorController route (handles 404/500 error pages); it should # likely stay at the top, ensuring it can always be resolved map.connect('/error/{action}', controller='error') map.connect('/error/{action}/{id}', controller='error') # CUSTOM ROUTES HERE map.connect('', controller='main', action='index') map.connect('/{controller}/{action}') map.connect('/{controller}/{action}/{id}') return map I've also deleted the contents of the public directory (except for favicon.ico), following the answer to http://stackoverflow.com/questions/1279403/default-route-doesnt-work Now I just get error 404. What else do I need to do to get such a basic thing to work?

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• UTF-8 BOM in php response to mootools xmlhttprequest

  - by Jimmy

  Hi, I'm writing my first little AJAX-enabled Joomla component. I'm using mootools. I got a xmlhttprequest to contact my Joomla component, and the component returns a response - just plain text echoed by php, like echo 'Hello World!'; It's all working fine, except wireshark tells me that the response is prepended with \357\273\277\357\273\277 when it gets read by the javascript on the client side. This shows up as a little square before the response in an alert box that the script shows. I don't explicitly set the encoding on the xmlhttprequest; mootools docs say that it defaults to UTF8. What's the right way to handle this? Should I be setting the encoding on the request? Mime type? Should the javascript get rid of it? I'm not planning to have any characters requiring UTF8 in the response, so using plain old ascii would be ok for me too. Thanks

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• Why is there a limit of max 20 parameters to a clojure function

  - by GuyC

  Hi, there seems to be a limit to the number of parameters a clojure function can take. When defining a function with more than 20 parameters I receive the following: Obviously this can be avoided, but I was hitting this limit porting the execution model of an existing DSL to clojure, and I have constructs in my DSL like the following, which by macro expansion can be mapped to functions quite easily except for this limit: (defAlias nn1 ((element ?e1) (element ?e2)) number "@doc features of the elements are calculated for entry into the first neural network, the result is the score computed by the latter" (nn1-recall (nn1-feature00 ?e1 ?e2) (nn1-feature01 ?e1 ?e2) ... (nn1-feature89 ?e1 ?e2))) which is a DSL statement to call a neural network with 90 input nodes. Can work around it of course, but was wondering where the limit comes from. Thanks.

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• Storing Shell Output

  - by Emil Radoncik

  Hello everybody, I am trying to read the output of a shell command into a string buffer, the reading and adding the values is ok except for the fact that the added values are every second line in the shell output. for example, I have 10 rows od shell output and this code only stores the 1, 3, 5, 7, 9, row . Can anyone point out why i am not able to catch every row with this code ??? any suggestion or idea is welcomed :) import java.io.*; public class Linux { public static void main(String args[]) { try { StringBuffer s = new StringBuffer(); Process p = Runtime.getRuntime().exec("cat /proc/cpuinfo"); BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream())); while (input.readLine() != null) { //System.out.println(line); s.append(input.readLine() + "\n"); } System.out.println(s.toString()); } catch (Exception err) { err.printStackTrace(); } } }

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• Hide horizontal scrollbar in IE 7 and below

  - by Bradley Bell

  Hi all. Basically, I'm having trouble removing the horizontal scrollbar in Internet Explorer 7 and Below. I've tried the code below and It seems to work fine in every browser except IE. overflow-x: hidden; The even bigger problem is that, even though the scrollbar isn't even removed, it seems to completely screw the layout.. It somehow hides the majority of the page content in boxes 2 and 3? It also.. adds a second vertical scrollbar which moves relatively/absolute positioned items down?! I did contemplate just leaving the scrollbar in IE via a specified stylesheet, but even that seems to be messing with the page? The website is on a test directory here.. I'll post the stylesheet in a comment below. Any suggestions? Thanks in advance, hope you can help! Bradley

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• Java service wrapper and additional application command line parameters

  - by Jake

  I'm currently using java service wrapper to wrap a java application that I've developed. I'm needing to ability to pass in additional command line parameters to my application through the java service wrapper. Pretend my app is called myapp and I've setup java service wrapper so that the script I run to start is called myapp. I'd like to be able to do something like this: ./myapp start Parameter1 parameter2 and have those additional parameters get passed into my application. Any ideas how to do this? I'm finding that googling and looking at the documentation is only pulling up how to use command line arguments to setup java service wrapper. I've had difficulty finding anything about passing command line arguments to your application except for having them hard coded in your wrapper.conf file. Right now I feel like my option is to take the additional command line parameters, set them to environment variables and have those hard coded in the wrapper.conf. I'd prefer not to go down that road though and am hoping I've overlooked something.

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• Direct TCP/IP connections in P2P apps

  - by Greg Roberts

  From a Joel's post on Copilot: Direct Connect! We’ve always done everything we can to make sure that Fog Creek Copilot can connect in any networking situation, no matter what firewalls or NATs are in place. To make this happen, both parties make outbound connections to our server, which relays traffic on their behalf. Well, in many cases, this isn’t necessary. So version 2.0 does something rather clever: it sets up the initial connection through our servers, so you get connected right away with 100% reliability. But then once you’re all connected, it quietly, in the background, looks for a way to make a direct connection. If it can’t, no big deal: you just keep relaying through our server. If you can make a direct peer-to-peer connection, it silently shifts your data onto the direct connection. You won’t notice anything except, probably, much faster communication. How do they change the server connection to a P2P connection?

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• Adjusting ComboBox DropDown Width in C#

  - by Jim Fell

  Hello. I have this code that adjusts the width of a comboBox drop-down: private void comboBox_DropDown(object sender, EventArgs e) { ComboBox senderComboBox = (ComboBox)sender; int width = senderComboBox.DropDownWidth; Graphics g = senderComboBox.CreateGraphics(); Font font = senderComboBox.Font; int vertScrollBarWidth = (senderComboBox.Items.Count > senderComboBox.MaxDropDownItems) ? SystemInformation.VerticalScrollBarWidth : 0; int newWidth; foreach (string s in ((ComboBox)sender).Items) { newWidth = (int)g.MeasureString(s, font).Width + vertScrollBarWidth; if (width < newWidth) { width = newWidth; } } senderComboBox.DropDownWidth = width; } It works great, except it expands the width of the drop-down to the right, whereas I would prefer it to expand to the left because the comboBox is located on the right side of my form. Any thoughts or suggestions you may have would be appreciated. Thanks.

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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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• Converting rich text that contains backslashes to plain text or html

  - by Allison

  I am trying to convert a rich text string to plain text or html. I am currently using the RichTextBox.Text feature which works correctly for almost all cases except when the text contains backslashes then some of the text is stripped out as the converter believes that it is part of the rtf formatting. Does anyone have any ideas of how to get the backslashes to stay in that instance. Here is an example of a string I would have {\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 Arial;}}\viewkind4\uc1\pard\fs17 Testing Export \with comments\par} The text I would need would be "Testing Export \with comments" and the text I am getting back from the rtf converter is "Testing Export comments". Any help would be greatly appreciated. Please respond if you have further questions.

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• How to convert thousands of PDF files to a single Postscript file in a specified order

  - by tggagne

  I've discovered multiple options for convert a few to serveral PDFs into Postscript, but many are command-line programs with command-line limitations (this application lives on .NET). Our application generates tens-of-thousands of PDFs that we need to send to a printer, except BEFORE the Postscript is printed we need to edit the Postscript to insert print command instructions (duplex, tray-pulls, highlight color, etc.) I think a perfect solution might allow us to write the PDFs to a stream, and simultaneously allow us to read the output stream so we may edit the Postscript before writing it to a file. Of course, if I must create the file first containing all 10,000 PDFs and edit it in an additional pass, I'm OK with that, too. I should mention that speed is important. I need to print 10,000 at a time, but need to keep the printers busy 24-hours/day.

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• VB.Net: How to fill in a form in a website, then click at a button and download the file using webbr

  - by BasisBit

  I am using a WebBrowser-Control to fill in a webform and then click at a button, this currently results in a standard Download File Dialog (you get these if you download a file using internet explorer), but instead, I have to catch this file and save it automatically with a by me defined name to a specific folder. I am trying to code a little application in vb.net which download the Export-file from my wordpress-blog, and I want to do this completely without user-interaction. Currently everything works, except the downloading of the file. I tried to catch it with the event System.Windows.Controls.WebBrowser.Navigating(ByVal Object, ByVal System.Windows.Navigation.NavigatingCancelEventArgs) but I don't see where to download the file from :( I hope you guys can help me.

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• How was non-decimal money represented in software?

  - by dan04

  A lot of the answers to the questions about the accuracy of float and double recommend the use of decimal for monetary amounts. This works because today all currencies are decimal except MGA and MRO, and those have subunits of 1/5 so are still decimal-friendly. But what about the software used in U.S. stock markets when prices were in 1/16ths of dollar? The accuracy of binary data types wouldn't have been an issue, right? Going further back, how did pre-1971 British accounting software deal with pounds, shillings, and pence? Did their versions of COBOL have a special PIC clause for it? Were all amounts stored in pence? How was decimalisation handled?

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• How can I hide tracing code in Visual Studio IDE C# ?

  - by Mark

  As I'm starting to put more tracing in my code, i'm realizing it adds a lot of clutter. I know Visual Studio allows you to hide and reveal code, however, i'd like to be able group code into "tracing" code and then hide it and reveal at will as i'm reading the code. I suppose it could do this either per file or per class or per function. Is there any way to do this? What do you guys do? Adding some clarification The hide current feature kind of allows you to do this except that when the code is hidden, you can't tell if its tracing or not. You also can't say "hide all tracing code" and "reveal all tracing code" which is useful when reading a function depending on what you are trying to do.

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• GPU YUV to RGB. Worth the effort?

  - by Jaime Pardos

  Hello, I have to convert several full PAL videos (720x576@25) from YUV 4:2:2 to RGB, in real time, and probably a custom resize for each. I have thought of using the GPU, as I have seen some example that does just this (except that it's 4:4:4 so the bpp is the same in source and destiny)-- http://www.fourcc.org/source/YUV420P-OpenGL-GLSLang.c However, I don't have any experience with using GPU's and I'm not sure of what can be done. The example, as I understand it, just converts the video frame to YUV and displays it in the screen. Is it possible to get the processed frame instead? Would it be worth the effort to send it to the GPU, get it transformed, and sending it again to main memory, or would it kill performance? Being a bit platform-specific, assuming I work on windows, is it possible to get an OpenGL or DirectDraw surface from a window so the GPU can draw directly to it?

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• Storing Temporary Items Without User Having to Register

  - by Dex

  I have a ruby on rails app where I want users to be able to store a list. The list is similar to a shopping cart except for the fact that they input their own items. I would like store everything in the session, but this seems like it would get complicated and would start to take up space after a while. The other way of doing it was to create temporary entries in the database with a "temp" flag and session id so that they could come back to it. The only problem with this is, how do I clean out stale entries?

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• Simple HTTP Framework and time issue

  - by Deniz Acay

  I'm using Simple Framework for my recent project, and there is a problem with the date headers generated by the system. I can get my local time from Date class correctly, but setDate method of Simple's Response class sets date in milliseconds and when i do that by calling System.currentTimeInMillis, dates in response headers are incorrect. is there any way to solve this problem with Simple Framework? If not, what can i do except calling set method with a date string? Thanks in advance... EDIT: Date in the headers are in wrong timezone. And i also tried Calendar.getInstance().getTimeInMilis() method.

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