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• Touch screens for kiosk applications

  - by Micah

  I'm developing a kiosk-style touchscreen application in Qt. Currently I'm using an Elo Touch surface acoustic wave touchmonitor which works well except for one thing: drag performance is way too poor to provide a good user experience. As this is the case for the cursor in X as well as in my application, it seems to be either the fault of X (probably not) or the touchmonitor. Since mobile platforms are able to achieve very high performance in this regard, it seems like it should be possible for vastly more powerful desktop systems. Does anybody have experience with getting good drag performance out of desktop touchmonitors? What hardware have you used? Is X to blame?

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• AJAX with Web services and ASP.NET SessionState

  - by needhelp1

  We have an application which uses ScriptManager to generate a client-side proxy which makes AJAX calls to web services. The web services being invoked live in a separate appDomain(separate cluster altogether). The problem is that our application uses a State server for storing session. I want the web services to be able to access session also. First off, does anyone see anything wrong with the client making web service calls to a separate cluster(we're hoping this would be a better approach for scalability)? I was thinking that possibly anytime there is an update to the session dictionary in one appDomain, automatically update the session in the other appDomain also(referring to the web service appDomain, don't know how to do this, only theoretical). What do others think? Thanks!

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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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• a better way to initialize database ONCE when rail server starts

  - by Hadi

  i would like to initialize database the first time the server is started, that involve calling a class method. Given the class name is: Product At first i put an .rb file config\initializers\init.rb as it gets automatically called. Everything works ok, until the database is deleted, and i am trying to do rake db:migrate. rake db:migrate fails saying that cannot find 'product' table. inside init.rb = Product.populate_db The solution i came up is: I took out init.rb do rake db:migrate put back init.rb run the server. My rails application is mainly for reporting and the data is seeded from other application, so i have to do the above step everyday Is there a better way to do the initialization?

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• How to use @PersistentCapable annotation in Scala 2.8

  - by Gero

  Hi, I'm switching from Scala 2.7.7 to Scala 2.8.0RC3 and now a few of my classes don't compile anymore. The problem is in the @PersistentCapable annotation: import javax.jdo.annotations._ import java.util.Date @PersistenceCapable{identityType=IdentityType.APPLICATION} class Counter(dt: Date, cName: String, vl: int) { <.. snip ..> } This code results in the following compilation errors: [ERROR] /Users/gero/prive/kiva/kivanotify-gae/src/main/scala/net/vermaas/kivanotify/model/LoanProcessed.scala:7: error: expected start of definition [INFO] @PersistenceCapable{val identityType = IdentityType.APPLICATION} I already tried a couple of variations, did some Googling but without luck. Any ideas on how I can use the @PersistentCapable annotation with Scala 2.8.0 RC3? Thanks, Gero

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• How/is data shared between fastCGI processes?

  - by Josh the Goods

  I've written a simple perl script that I'm running via fastCGI on Apache. The application loads a set of XML data files which are used to lookup values based upon the the query parameters of an incoming request. As I understand it, if I want to increase the amount of concurrent requests my application can handle I need to allow fastCGI to spawn multiple processes. Will each of these processes have to hold duplicate copies of the XML data in memory? Is there a way to set things up so that I can have one copy of the XML data loaded in memory while increasing the capacity to handle concurrent requests?

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• C# ProgressBar design pattern

  - by MadSeb

  Hi, I'm working on a database upgrader application. The upgrader updates the schema of a database ( adds new columns, renames columns , adds new tables, new views to an existing database by executing SQL statements ). When a user wants to upgrade from version 1.0 to 2.0 , "Upgrader" objects are taken from an object factory and the "Execute" method of each "Upgrader" is called. The GUI of the application has a progress bar and each time an upgrader object performs a SQL statement the progress bar gets incremented. while (!version.Equal(CurrentVersion)) { IUpgrader myUpgrader = UpgraderFactory.GetUpgrader(version); myUpgrader.Execute(UpgradedFile,progressbar); version.Increment(); } My question is very simple : how should the upgrader object communicate with the progressbar. In the code above, the upgrader object is given direct access to the progressbar but I'm wondering if some better way of doing this or better design pattern exists. Regards, Seb

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• Direct2D window black when not in focus

  - by Saul Rennison

  Hi all, I have a Direct2D window which paints fine when in focus; however, when focus moves to another window (same application or another), the entire window goes black. I pinned the issue down to the use of ID2D1HwndRenderTarget::Clear. This function is vital to my application as without it, painting becomes rather... weird. Is there a way an un-focused Direct2D window can paint as normal (note: WM_PAINT is being called as usual, as is Clear, BeginPaint, etc. all without error) Thanks in advance.

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• in free(): error: junk pointer, too high to make sense Segmentation fault: 11 (core dumped) gprof

  - by Mayank

  I am trying to profile my application. For this I compiled my code with -pg and -lc_p option, it compiled successfully During run time I am getting the following error. in free(): error: junk pointer, too high to make sense Segmentation fault: 11 (core dumped) Doing GDB gives error as. (gdb) b main Breakpoint 1 at 0x5124d4: (gdb) r warning: Unable to get location for thread creation breakpoint: generic error [New LWP 100085] cacheIp in free(): error: junk pointer, too high to make sense Program received signal SIGSEGV, Segmentation fault. [Switching to LWP 100085] 0x00000000006c3a1f in pthread_sigmask () My application is multi threaded and is a combination of C and C++ code. uname -a FreeBSD 6.3-RELEASE FreeBSD 6.3-RELEASE #0: Wed Jan 16 01:43:02 UTC 2008 [email protected]:/usr/obj/usr/src/sys/SMP amd64 Why is the code crashing. Am I missing something.

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• qt in windows7 environment

  - by sneha

  Hello everyone, i am having problem with running an example from qt which uses win32 libraries when i compile i dnt get any errors but when i run it is not able to open the application (.exe) file in windows 7.but when i compile this example in windowsXP it works fine. can anyone let me know whether i need to change my .pro file inorder to get it worked under windows 7. PLease help me out.thanks in advance. here is my .pro file # ------------------------------------------------- # Project created by QtCreator 2010-04-16T11:45:43 # ------------------------------------------------- QT += network QT += xml QT += opengl TARGET = Application TEMPLATE = app SOURCES += main.cpp \ mainwindow.cpp \ Tools.cpp \ Objects.cpp HEADERS += mainwindow.h \ Tools.h\ Objects.h unix { OBJECTS_DIR = .obj MOC_DIR = .moc } # UNIX installation isEmpty(PREFIX):PREFIX = /usr/local unix { headers.path = $$PREFIX/include/ZIP headers.files = $$HEADERS target.path = $$PREFIX/lib INSTALLS += headers \ target } !mac:x11:LIBS += -ldns_sd win32:LIBS += -ldnssd LIBPATH = C:/Temp/mDNSResponder-107.6/mDNSWindows/DLL/Debug INCLUDEPATH += c:/Temp/mDNSResponder-107.6/mDNSShared

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• How to automize multiple projects build process by including digital signature of exe in Delphi?

  - by user193655

  After building a project group of 2 projects with Delphi (2009) I digitally sign the 2 exes using InstallAware Code signing, an exe that shipped with Delphi 2009. How is it possible to automize the digital signature, so when I build I can also attach digital signature. For digital signing I use a pvk (private key) file and an spc (Sw publisher certificate) file. Subquestion: Moreover I created a project group because I have 2 exes, but they are almost the same, the only thing that changes is the Application icon and the application name (one is ProductOne.dpr, the other is ProductTwo.dpr). In practice I have 2 brands of the same product, I have a single build but activation keys details activate one or the other, anyway now I was asked to change the icon and the filename, and for this I need to build 2 projects, activation key is not enough anymore to distinguish between the 2. Anyway if there is a way to do this from a single project it would be better.

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• ASP.NET Routing (in WebForms)not working when deployed under IIS,Works in IDE

  - by Shyju

  I have an ASP.NET web application(webforms,not MVC) developed in VS 2008 and i have implemented ASP.NET web forms URL routing by following this link http://www.4guysfromrolla.com/articles/051309-1.aspx#postadlink It works pretty good when i run it on the Visual studion IDE.But does not works when i created a site under my IIS (IIS 5.1 in XP) and deployed the same files there.I have set ASP.NET version as 2.0 in the Properties window of my application too.But does not work. Any idea Why ? Is there anything else to be setup ? Thanks in advance

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• Dynamic size canvas with Scroll bars

  - by Pawan

  Hi, I am developing a simple WPF application without any auto layout. The goal is when a user clicks (mouse down) a element (say textBlock) will appear at the location of the mouse click. For this I am using canvas panel embedded in a Grid of 1 row, 1 column and scrollviewer (visible). The issues are: 1. when the application window is resized the scroll viewers do not become active. 2. I want the ability to auto grow the canvas with mouse drag. Something like in MS-Excel when user drags the mouse horizontally/vertically the canvas should grow. I have searched net a lot to figure this out and am unable to get an answer. Any help in this regard would be great. Thanks a bunch in advance. -P

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• How can I prevent MEF from throwing an exception when an Export is not found?

  - by Kilhoffer

  I have a class with an IList<T> property decorated with the [ImportMany(allowRecomposition = true)] attribute. There are some conditions in which the application might not find any available Exports of the requested type. Right now, it's throwing a CompositionException if no Exports of the requested type are found. I dislike application flow being determined by thrown exceptions, so I would rather not catch and react in this case. Rather, I just want program execution to continue. Is there a flag or something I can set to make this Import optional? I know for single import properties, you can do this: [Import(AllowDefault = true)] but 'AllowDefault' is not an option on the ImportMany attribute.

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• Disk Error on Boot (Possible boot sector issue)

  - by Choco

  I own a 4-5 year old Dell Dimension E510 with Windows XP: Media Center Edition. I have 2 drives installed: C Drive: Windows XP: Media Center Edition G Drive: 2 partitions: Windows 7 (beta) Windows XP (professional) That is also the order they are connected. The C Drive is my primary drive. When I attempt to boot the computer, the bios loading screen appears normally; the progress bar moves and it's fine. The very next page, however, supposed to be a boot choice. When I installed Windows 7 onto the G Drive in context of the C drive it added a boot selector to the C drive's boot sequence. It gives me the option of booting Windows 7 or Windows XP: Media Center Edition. However, my problem is now this: After the bios screen I previously mentioned, instead of a boot selector, I receive the following error: A disk read error occurred. Press CTRL+ALT+DEL to restart. The drive is spinning up normally. I hear no odd noises/clicks/scraping coming from it, even after disabling the other drive to listen to it carefully. According to me, it's a boot sector issue. I have never experienced this before, but maybe during a recent shutdown, Windows XP: MCE errored out and ruined the boot sector. Dilemma! I don't have the Windows XP: MCE disc, because it was installed by the factory. I have accessed the hidden partition on the drive before (you hit a key combination on the bios screen and it comes up with an interface to fix your drive). However, I don't want to reformat the drive (which is what the interface gives me the option to do). I want to possibly fix the boot sector. How can I achieve that?

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• C# Spell checker Problem

  - by reggie

  I've incorporated spell check into my win forms C# project. This is my code. public void CheckSpelling() { try { // declare local variables to track error count // and information int SpellingErrors = 0; string ErrorCountMessage = string.Empty; // create an instance of a word application Microsoft.Office.Interop.Word.Application WordApp = new Microsoft.Office.Interop.Word.Application(); // hide the MS Word document during the spellcheck //WordApp.WindowState = WdWindowState.wdWindowStateMinimize; // check for zero length content in text area if (this.Text.Length > 0) { WordApp.Visible = false; // create an instance of a word document _Document WordDoc = WordApp.Documents.Add(ref emptyItem, ref emptyItem, ref emptyItem, ref oFalse); // load the content written into the word doc WordDoc.Words.First.InsertBefore(this.Text); // collect errors form new temporary document set to contain // the content of this control Microsoft.Office.Interop.Word.ProofreadingErrors docErrors = WordDoc.SpellingErrors; SpellingErrors = docErrors.Count; // execute spell check; assumes no custom dictionaries WordDoc.CheckSpelling(ref oNothing, ref oIgnoreUpperCase, ref oAlwaysSuggest, ref oNothing, ref oNothing, ref oNothing, ref oNothing, ref oNothing, ref oNothing, ref oNothing, ref oNothing, ref oNothing); // format a string to contain a report of the errors detected ErrorCountMessage = "Spell check complete; errors detected: " + SpellingErrors; // return corrected text to control's text area object first = 0; object last = WordDoc.Characters.Count - 1; this.Text = WordDoc.Range(ref first, ref last).Text; } else { // if nothing was typed into the control, abort and inform user ErrorCountMessage = "Unable to spell check an empty text box."; } WordApp.Quit(ref oFalse, ref emptyItem, ref emptyItem); System.Runtime.InteropServices.Marshal.ReleaseComObject(WordApp); // return report on errors corrected // - could either display from the control or change this to // - return a string which the caller could use as desired. // MessageBox.Show(ErrorCountMessage, "Finished Spelling Check"); } catch (Exception e) { MessageBox.Show(e.ToString()); } } The spell checker works well, the only problem is when I try to move the spell checker the main form blurs up for some reason. Also when I close the spell checker the main form is back to normal. It seems like it is opening up Microsoft word then hiding the window, only allowing the spell checker to be seen. Please help.

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• Allow run-time configuration of web service url using ATL soap and sproxy-generated proxy class

  - by Odrade

  I have a Visual C++ application that communicates with an ASP.NET web service via ATL Soap. The client application uses an sproxy-generated proxy class for the communication. Looking at the generated proxy class, I noticed that the url for the web service is hard-coded in numerous places. It would be preferable for the url to be configurable at run-time (e.g. stored in a config file). Could anyone recommend a method for doing this? It doesn't look like the class generated by sproxy is amenable to hand-editing.

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• How to choose which network connection provides the default gateway in Windows XP

  - by Cathy

  I have a laptop with an integrated NIC and a WiFi connection. Both the wired and wireless networks I am using can access the Internet. Win XP is routing all traffic through the wireless network. I want to force it to route everything through the wired network when it is available (i.e. when I am sitting at my desk with the laptop docked) and through the wireless when that is the only option (i.e. when I have undocked my laptop and carried it to a conference room, or if I am out of the office working on a different WiFi network). The wireless connection cannot be established until after I am logged into Windows, so it's always the second network to become available to the OS. I have manually overridden the metric values in the TCP/IP configurations so that the NIC has metric 10 and the WiFi has metric 20. However, Windows is still picking the WiFi adapter's address as the Default Gateway, so this isn't helping. If I manually disable and re-enable the WiFi adapter, then it will switch the default gateway to the wired network and stay that way until I shutdown Windows. How can I tell Windows XP not to replace the default gateway when the WiFi connection is first enabled?

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• file_column not creating files, just empty tmp directory

  - by Yanaek

  Up to the end of December 2009 everything worked fine, so i assume that after some upgrades on servers (Ubuntu 8.10 and second Ubuntu 9.10) something stopped working. Model: class Product < ActiveRecord::Base belongs_to :category file_column :thumbnail, :magick = { :geometry = "150x100" } there is of course table 'products' in database, and it has column 'thumbnail' what's interesting that File actually is uploaded to server, it goes to the /tmp directory under RackMultipartXXXX-0 name, and it is unmodified image. The problem is, that then this file is not moved to 'tmp' dir under RAILS_ROOT/public/product/ nor the 'XX' (where xx means ID of a product) under public/product also. i don't know what to do, i spend few HOURS trying different versions of file_column, also trying to make new, test rails application only from scaffold, but then, in this new application problem was the same

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• Disabling Laptop (PB TJ-75) faulty card reader Linux

  - by Gab

  My problem comes from that my laptop [PB TJ-75] has a faulty Alcor card reader. It’s 100% sure, the device is dead and unusable whatever the OS is. It cannot be disabled in BIOS [latest: Vendor: Phoenix Technologies LTD Version: V1.26 Release Date: 05/04/2010]. If I could take it apart from the main board easily, and if with that, the system would never look again for it, I’ll be very happy! Is it possible, has anyone ever tried this? Or maybe, replacing the BIOS with a more open one, which let you disable the card reader. Does this exists? Here's what I've tried to disable it so far. In Win7, I choose ‘disable’ in device manager and that’s ok. If not, the device keeps on appearing and disappearing and lot of resources are used. In Lubuntu 13.04, I got extra boot time, with the msg:'sdb, assuming drive cache, etc.’ I tried other distros (isos booted by grub). I can boot Puppy, Gparted, and Redobackup apparently without any problem. I cannot boot Debian, live or install + tried Crunchbang and Tails. I got a loop :’usb device, scsi n+1 blabla‘. I tried "nousb", no result, I have blacklisted EHCI, no result, then usb_storage module, better boot time in Lubuntu, with just the message "...data transfer failed", better shutdown time too. But, no way to use usb storage medias. In Debian, it ends with BusyBox prompt. Is it possible to just disable that Alcor card reader? Does it have a specific module? Is there a special kernel boot option that I missed? Does it have something to do with kernel recompiling, and if yes, how to do with isos? Programming a driver which says everything is ok (out of my comprehension for the moment)? Disabling device by vendor id? What is the best way?

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• Why isn't WH_MOUSE hook global anymore?

  - by Valentin Galea

  I have this global mouse hook setup in a DLL that watches for mouse gestures. Everything works perfectly but with a hook set for WH_MOUSE_LL which is a low-level hook and one that doesn't need to be in an external injectable DLL. Once I switch - to the more suitable one would say - WH_MOUSE mouse hook, everything falls apart. Once I click outside my main application (the one that installs the hook), the hook gets corrupted - ::UnhookWindowsHookEx will fail. I only found this guy saying at experts exchange: "No way, at least under Windows XP + SVP2 WH_MOUSE won't go global, you must use WH_MOUSE_LL instead." I setup the hooks correctly: in a DLL using a shared data section, posting and not sending messages from the hook proceduce. Why has this changed? And why is not documented? Anyone encountered this? Thanks! BTW: I've reverse engineered a bit the popular StrokeIt application and it uses a combination of WH_GETMESSAGE and WH_MOUSE hooks and still works on XP/Vista...

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• Qt: Writing plugins for other applications

  - by Rasmus Faber

  I am writing a plugin for another application. I want to support the plugin on multiple platforms, so I am strongly considering using Qt. The plugin needs to be able to show some basic GUI. The plugin interface does not in any way handle GUI - it is just a simple DLL/shared library specified with a C-header file. Can I use Qt inside such a shared library? The calling application might or might not be using Qt itself. Any hints on what to do? Do I need to run a QApplication event-loop in a separate thread? Or can I just call the event-loop myself while waiting for input? (I only need modal dialogs).

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• Click Tabbar to Open Email view in iphone

  - by Pugal Devan

  HI, I am new to iphone development.I have created tabbar as programmatically and sets two view in the tabbar. Now i want to load a email application view when i clicked the tabbar and it opened and works properly.Then i clicked the next tabbar and come back to the email view, it doesnot displayed.So i am facing the problem is only one time open my mail application. I want to display the email view while clicked the tabbar. Now i have written in my code is viewDidLoad. So please guide me. Here is my code, - (void)viewDidLoad { [super viewDidLoad]; MFMailComposeViewController *mail = [[MFMailComposeViewController alloc] init]; mail.mailComposeDelegate = self; if ([MFMailComposeViewController canSendMail]) { [mail setToRecipients:[NSArray arrayWithObjects:@"[email protected]",nil]]; [mail setSubject:@"Title"]; [self presentModalViewController:mail animated:NO]; } [mail release]; } Thanks.

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• Is my laptop battery dead?

  - by Josh

  Recently my laptop battery will get extremely hot (definitely hotter than it should get) when I charge it. After that I usually end up removing it once it's fully charged to let it cool down, which takes a couple hours... Question is, is my battery dead? My last battery I had that died just ended up lasting 2 - 3 minutes on battery, no weird heat issues. And is there any way to possibly fix this? Probably not but I won't be able to get a replacement anytime soon. UPDATE: A few days ago when this happened and it cooled down, assuming it was fully charged, I ran my laptop on battery, and the battery life lasted about 10 minutes and then the laptop shutdown. I then plugged it in later and charged it back up, and for a while I had a orange light blinking on my laptop - which I assumed meant the battery was dead, especially since I got 10 minutes battery life. Then today, I turned my laptop on and was surprised to see that the battery was at 20% and charging (it's been plugged in since the incident above, so it should have been fully charged when I shut it off) I let it charge up, and as usual it got pretty hot around the time it was fully charged. So I turned my laptop off and pulled the battery out to let it cool down Now the thing is, just now I tried running it on battery, and it's been going for an hour now... so maybe its not dead? (also the orange light is no longer blinking...) Thanks in advance if anyone knows whats going on, and how to fix it, if its fixable =] EDIT: Some info if it helps... my laptop is about 2 years ago, and it's an Asus K50ID. I know laptop batteries usually don't last more than a year but I'm trying to keep this one going for as long as I can.

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• How do I share a Hibernate SessionFactory across web applications?

  - by Jer

  I have two web applications that are running on a single Tomcat server and are connected to the same database with Hibernate. I am concerned that having two SessionFactory instances running around might cause some issues. Also, since both web applications share much of the same application logic, I thought it would be a good idea to centralize as much as I could. And since I use Spring for DI and Hibernate configuration it would make sense to have a single ApplicationContext as well. How would I go about doing something like this? Do I need to deploy a headless WAR that creates an ApplicationContext and thus a SessionFactory and allow each application access to it? Is this even a good idea?

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