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• WPF - attached behavior to capture MouseEnter on Image in TreeviewITem

  - by pileggi

  Hi! Could I have, please, a little code-sample of WPF "attached behavior"? I explain my problem: I've done my TreeView all with XAML but now I'd like to manage an event with code-behind. The HierarchicalDataTemplate contains an Image. I need to capture the events MouseEnter / MouseLeave on the Image. I'd like to do this with "attached behavior", but I don't know how. Thank you! Pileggi

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• question about asp.net lifecycle

  - by Varyanica

  how can i programmatically restart page lifecycle? i do some stuff in controls events which affects these controls. to see changes i have to draw page again. how can i do it?

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• How do I register a server side click on an HTMLGenericControl?

  - by Brian Scott

  I'm looking for a reliable mechanism to generate a server side postback handler for an HTMLGenericControl such as an . I have some markup that I do not wish to change and would prefer to treat this in the same fashion as a standard .Net server control. Also, I know I can use a template based control to place some .Net controls within the markup as hidden and then trigger their click events from a client side click proxy. However, I'm really enquiring as to whether this can be done better.

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• Is there a way to set the maximum number of error messages a log4net memory appender can contain?

  - by uriDium

  I would like to add a memory appender to the root logger so that I can connect to the application and get the last 10 events. I only ever want to keep the last 10. I am worried about this appender consuming all too much memory. The application is designed to run 24/7. Or is there another way?

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• Windows 7 randomly installs an "Unknown Device"

  - by Amazed

  Rarely (several days to weeks between occurrences,) and seemingly at random, I get a balloon notification from Windows 7 (x64 SP1 Home Premium) that it is installing hardware for me. However, no new hardware has been installed or plugged in! When I click the balloon it doesn't give me any useful information: Looking in the event log, I find this entry: Event ID: 20001 Source: UserPnp Task Category: 7005 Message: Driver Management concluded the process to install driver FileRepository\usb.inf_amd64_neutral_153b489118ee37b8\usb.inf for Device Instance ID USB\VID_0000&PID_0000\6&3AF9A177&0&0060&&02 with the following status: 0x0. It appears to be USB related. My motherboard has both USB 2.0 and 3.0 controllers. My keyboard and mouse are plugged into the 2.0 slots and the data/recharge cable for a tablet (but not the tablet itself) was plugged in to the 3.0 slot. No other USB devices have been attached for several days/reboots. Why is Windows doing this?

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• Keyboard Typing Problem

  - by Wietse G

  Hello all, When i got home from work yesterday i couldn't logg in on my account on my desktop pc (Acer Aspire M5620). The reason for this was that when i was typing, more diggets would appear than i pressed. After logging on an account that required no password (my Dad's) i found out that some of my key bindings were messed up. For instance when typing: W --- qwe would appear q --- qw + right mouse e --- we a --- as s --- asd d --- sd z --- zx x --- zxc c --- xc Moreover pressing: 1 --- 12 2 --- 123 3 --- 23 I am typing this from my Dad's laptop (which is working like a charm). I was wondering if anyone has seen this problem before and thus knows a way to fix it. I'm not the brainy type when it comes to computers. Ps: I apologise for any mistakes in my English, for it is not my native tongue. I'm from the Netherlands

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• Computer Components

  - by Martin

  What is the role of a motherboard in terms of how components communicate with the processor (via the system busses). Therefore, for each component, which communication bus is involved and what is the route that data takes from the component to the processor, including; The bus name Whether bus is serial or parallel The name of any bridges involved Also, what is the the role of a bridge The components are: Internal components: Floppy Drive, Hard Drive, CD/DVD Drive, Memory, Processor Power supply, Graphics card & Sound card External devices: Monitor, Keyboard, Mouse (PS2 & USB), Printer, Pen Drive I have absolutely no idea of what the routes are and how motherboards communicate, could someone give me a start here? Thanks.

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• Numlock on when computer is off

  - by George Duckett

  I have a desktop PC which was recently moved. Since moving I've noticed that even while the PC is turned off (but wall socket turned on) the NumLock LED on the keyboard is on. It may have been doing this before the move, but I've only noticed it now. Maybe it matters that the keyboard is connected via a shared mouse/keyboard PS/2 port and I'm running Windows 7. I've not checked whether the LEDs are just keeping whatever state they were in when I turned the PC off but will do this if that information could be relevant. Why does the led stay on when the PC is turned off and how can I prevent this?

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• Strange scaling when duplicating monitors with another screen

  - by Aerione

  I can't get two monitors to scale application resolutions the same way. My main monitor works normally. My second monitor however, which is set to duplicate its image onto a TV I have in my room, renders the applications in a far lower resolution than the 1080p I've set it to. Also, the mouse pointer on the second monitor is enormous, it looks 2-3 times bigger than the one on the main monitor. I've checked the "Let me choose one scaling level for all my displays", to no avail. Here are some comparison pictures. Metro on the main monitor: Metro on monitor 2 (set to 1080p and to duplicate on a TV): This issue only seem to arise when I duplicate the monitor onto the TV. Does anyone have any idea of how to solve this?

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• Which keyboard has better ergomics?

  - by Absolute0

  When I was a kid I fell hard on my right wrist and since then I always get wrist pains when angling my wrist very high up (ie: when using a very high shaped mouse or doing push ups). So I have narrowed down my choices for a keyboard to the following 2: Microsoft Natural 4000: And the Razer Arctosa: The Razer is a slim type keyboard similar to a laptop feel and the hand-rest would help with keeping my hands straight with respect to my forearms. I am more inclined on getting the razer but am not sure if this will benefit my wrists in the long run. Any thoughts on this would be greatly appreciated. Thanks.

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• Excel VBA Application.OnTime. I think its a bad idea to use this... thoughts either way?

  - by FinancialRadDeveloper

  I have a number of users I support that are asking for things to happen automatically ( well more automagically but that's another point!). One want events to happen every 120 secs ( see my other question ) and also another wants 1 thing to happen say at 5pm each business day. This has to be on the Excel sheet so therefore VBA as addins etc will be a no no, as it needs to be self contained. I have a big dislike of using Application.OnTime I think its dangerous and unreliable, what does everyone else think?

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• Linux for a laptop? [closed]

  - by spriteless

  I would like to install Linux on a laptop. So I have emptied the hard drive, and can boot off a CD. So far I have failed to format the hard drive to Linux, to install Linux, and to change it so that I don't have to hit escape when loading in order to boot from CD (or get Linux on the hard drive and boot to it). The old laptop has 640 MB RAM, 600*800 screen, a CD drive and USB mouse and floppy drives. I eventually mean to use it to look at PDFs if possible, or RTFs that I converted from PDFs if not.

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• taskbar-free window manager

  - by 7vies

  I'm looking for a window manager that is not based on the "standard" taskbar (which I find a poor idea and I'm completely tired of). I'm aware of tiling window managers and improvements in last versions of operating systems, but I can't find what I need. I suppose that any window takes the whole screen (or can be tiled), and I imagine switching between windows like that: on a hotkey or mouse hot zone the screen becomes a task switcher where tasks are organized in a somewhat convenient manner. Well, it's a bit like a taskbar with autohide, but I think there could be some more convenient ideas than simply stacking icons and descriptions... It is also supposed to be lightweight enough, for example to run on a netbook. Any suggestions?

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• Hosting a VST/DX instrument in C#/C++?

  - by James D

  I'm trying to get a read on the effort level involved in building a barebones virtual instrument host in C++ or C# but I haven't been able to get any hard information. Does anybody know any good starter apps, tutorials, helper libraries for this sort of thing? If it matters, the goal would be to a) accept incoming MIDI events and b) dispatch them to the virtual instrument. In C++ or C#, if possible. Thanks!

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• How to use WndProc from a C++ dll?

  - by Priyank Bolia

  I want to handle some SAPI messages from a DLL, which is some sort of plugin. How to handle messages/events inside a VC++ dll. The SAPI event handling is shown in the example at: http://msdn.microsoft.com/en-us/library/ms720165%28VS.85%29.aspx

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• How to protect an OS X Server from an anautorized physical connection?

  - by GJ

  Hi I have an OS X 10.6 server, which I administer via SSH and VNC (via SSH tunnel). I can't leave it at the login window since then VNC connections are refused. Therefore I currently leave it logged with my user account. Since it doesn't have a monitor attached, it doesn't go into screen saver mode, which means it doesn't require a password to retake control. This means it is very easy for anyone connecting a keyboard/mouse and monitor to take control of the system. The screen saver password protection, which I can't get to activate, unlike the system's login window, is perfectly compatible with VNC connections. How could I prevent such direct access to the server without connecting a monitor and without blocking my ability to connect with VNC? Thanks!

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• Event sourcing: Write event before or after updating the model

  - by Magnus

  I'm reasoning about event sourcing and often I arrive at a chicken and egg problem. Would be grateful for some hints on how to reason around this. If I execute all I/O-bound processing async (ie writing to the event log) then how do I handle, or sometimes even detect, failures? I'm using Akka Actors so processing is sequential for each event/message. I do not have any database at this time, instead I would persist all the events in an event log and then keep an aggregated state of all the events in a model stored in memory. Queries are all against this model, you can consider it to be a cache. Example Creating a new user: Validate that the user does not exist in model Persist event to journal Update model (in memory) If step 3 breaks I still have persisted my event so I can replay it at a later date. If step 2 breaks I can handle that as well gracefully. This is fine, but since step 2 is I/O-bound I figured that I should do I/O in a separate actor to free up the first actor for queries: Updating a user while allowing queries (A0 = Front end/GUI actor, A1 = Processor Actor, A2 = IO-actor, E = event bus). (A0-E-A1) Event is published to update user 'U1'. Validate that the user 'U1' exists in model (A1-A2) Persist event to journal (separate actor) (A0-E-A1-A0) Query for user 'U1' profile (A2-A1) Event is now persisted continue to update model (A0-E-A1-A0) Query for user 'U1' profile (now returns fresh data) This is appealing since queries can be processed while I/O-is churning along at it's own pace. But now I can cause myself all kinds of problems where I could have two incompatible commands (delete and then update) be persisted to the event log and crash on me when replayed up at a later date, since I do the validation before persisting the event and then update the model. My aim is to have a simple reasoning around my model (since Actor processes messages sequentially single threaded) but not be waiting for I/O-bound updates when Querying. I get the feeling I'm modeling a database which in itself is might be a problem. If things are unclear please write a comment.

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• Can't find synergy config file on Windows

  - by Joel Avery

  New to synergy I connected everything just fine. Both my Windows 7 64bit (server) and 7 32 bit (client) are connected perfectly. However, I can't tell synergy which screen is where because I can't find this config file everyone is talking about. I looked in the root folder of the application, there is no ext/synergy.conf so I went and made one but that isn't working either. Kind of frustrating cause I think its the last step. Anyway any help is much appreciated. I have the newest version from the site but it says version unknown in the application. On Windows it has that cool drag and drop UI to place your screens where you want them but nothing is working for my mouse or keyboard.

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• Cheapest Embedded System with Wireless Connectivity?

  - by geeko

  Problem: I'm trying to capture some information coming from keyboard, mouse and barcode reader connected to some PC via PS/2, USB and/or RS-232, before information get to PC and send it over the Internet to some central server. I'm thinking to do so by using some kind of hardware interface (middleware, if you like) between PC and input devices. I thought this interface can be embedded PC, PDA or simply some mobile phone with wireless connectivity. PS/2 and RS-232 could be converted to USB using some USB convector/hub that connects to one of these interface systems. Then some special API programming take place to communicate between PC, input devices and wireless server, in the form of application running on the interface system. What's the cheapest solution that can achieve this? Or possibly any other solution?

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• Using Barcode ID for Event Management

  - by Nimbuz

  I have a barcode scanner and laptop (ofcourse :)), I'm looking for simple event management app that can process the input from the barcode scanner and keep attendance record for our frequent private meetings. I wonder if there's an open source software available that'd allow me to manage events using code 128 barcode id cards? Many thanks for your help.

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• Comet and [Session] TimeOut

  - by Amitd

  hi guys, Just Wondering how [session] timeouts are(or can be) implemented when using Comet? I'm using Long polling Comet solution and want to implement a kind of Timeout feature. Example : If the user is on a comet enabled page and doesn't respond to server events/notification for a period of time say 10 mins then invalidate his session and remove his request from server and redirect the user to a timeout page? Will this require Javascript XHR requests to check for a timeout explictly? Using ASP.NET 3.5 / C# Thanks

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• Sql Profiler Scan Started to execute a stored procedure

  - by Lieven Cardoen

  Does SqlServer has to start a Scan to execute a stored procedure? In Sql Profiler I can see this: RPC Starting ( exec sp_Edu3_SelectExamSession @ExamSessionId=N'AccessCode39361814' ) Scan:Started Scan:Started Scan:Started RPC Completed ( exec sp_Edu3_SelectExamSession @ExamSessionId=N'AccessCode39361814' ) Can I somehow see what's happening in the Stored Procedure? Different queries are done in that SP, but they do not seem to appear in Sql Profiler (maybe I need to check some more events?) The Scan:Started are probably scans by the queries in the sp? Or not?

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• Vista won't boot - just get black screen

  - by DisgruntledGoat

  When I boot into Windows Vista (Ultimate), I just get a black screen (with the mouse visible and working). If I run in safe mode, it seems to pause for a while when loading crcdisk.sys. A lot of research says it could be a problem with the hard drive, but I dual boot Ubuntu and that works fine and I can still see and use the Windows partition absolutely fine from Ubuntu. I tried using the "startup repair" option on the Vista install disk but it didn't detect any problems. I have run chkdsk several times, with this: chkdsk C: /f /r And also drive D (the recycle bin). The first two times it detected and fixed errors on the C drive but now it doesn't detect any errors. Is there anything else that could be causing this problem?

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• Windows 7 Locking up Randomly

  - by Michael Moore

  I've got a Windows 7 machine that is locking up randomly. It can be in the first thirty seconds, or it can be hours later. There is nothing specific I can find that is running when it happens. When it locks, the screen doesn't change, but nothing moves. The waiting icon stops, the mouse stops, keyboard doesn't work, etc. I've even tried the crash on ctrl-scrl registry hack, and it won't even dump the kernel. I've run hardware diagnostics on the RAM and it doesn't find any problems. I would think it is a hardware issue, but on this exact same machine, I can run 64 Bit Ubuntu and it has zero problems. I've even tried reinstalling Windows7 from scratch, and it still happens. Anyone have any ideas? Any good diagnostic tools to recommend? Thanks! Michael

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• 'Game Show' presentation

  - by albatross

  I work at a state university, and every day of summer orientation we have a little jeopardy-like game that new students' parents play. We run it in an auditorium. Right now the game is a powerpoint presentation (set up similar to jeopardy) off an old laptop running Powerpoint 2003. What I want to do is to purchase & use a smaller tablet/mini-book with a touchscreen. The touchscreen would be much more professional than dragging a mouse around the screen to select category questions. I also want to use hot keys during the presentation for sound effects (for correct + incorrect answers), and I want to play music and show an automated slideshow (photos from the day). This device would need vga or hdmi and audio out. I've been looking at iPads and iPad alternatives, but figured someone out there might have a better idea or done this before.

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