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• Multiply mode in SpriteBatch

  - by ashes999

  I have a "lighting" texture (black background with white or colours for lights) that I want to draw as a multiplcation operation. SpriteBatch.Begin can specify BlendState.Additive, but there's no BlendState.Multiplicative. I also tried the solution in this answer, but it didn't work -- even when I (incorrectly?) changed the code to work with XNA 4 style ColorDestinationBlend, I ended up with the final solution being inverted (black area where the light is, everything else is visible). I initially thought of a shader, but I couldn't get shaders to work with MonoGame, so I'm falling back to SpriteBatch.

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• Ubuntu is stuck when it goes to sleep mode in fullscreen

  - by hatter

  If there is a full screen terminal running when Ubuntu goes to sleep, it becomes stuck. This is not the problem with gnome-terminal as sometimes firefox in full screen also causes this problem. With firefox this doesn't happen every time. But with gnome-terminal this happens everytime and as explained in this answer, I use killall command and kill the application. Is this a bug and what can be done to aviod this?

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• ubuntu 12.10 grub doesn't appear efi mode

  - by user100604

  After a number of failed attempts on installing Ubuntu and Linux in the hybrid-gpt of Windows, in which I wanted different partitions by gparted, I ended up creating againg a conventional partitions table within the conventional system. This photo is not mine because as creating the partition I did not think in taking photos, but I am showing you it so that you can see the format “MS-DOS”, the standard format of gparted. My neetbook is a k55MV Asus 500GB (the page don't allow me to put 3 hiperlink I will put it at the end in a new coment 1) I installed Windows by creating a partition just for it. Windows created two partitions else for starting the system up. However creating it on ms-dos appear now in gpt view fotos 2) With the rest of the space, I created a 90-gigabyte partition for Ubuntu and the “swap” of 4 gb. The other partitions are for data. 3) I assured myself about installing Ubuntu in the partition whose format was ext4, for using that partition as base and to install the “grub” on the base of 500gb. I have boot the system up, Ubuntu is loaded but the grub does not appear. I have tried by pressing “beginning” “UPPER CASE LETTER”, but no way! I have checked the flies up, and partitions are there. http://www.subirimagenes.com/imagen-capturadepantalla-8080960.html By pressing fdisk-1, this picture comes up: http://www.subirimagenes.com/imagen-capturadepantalla-8080965.html I am spanish updated: at the beginning of the system, pressing f12 appears a grub without windows

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• Installing Ubuntu in EFI mode Cant go beyond GRUB Menu

  - by Vulcan

  I created a LiveUSB of Ubuntu 12.04.3 LTS using Pendrive Linux. -Created a separate 30GB partition using Windows 8 Disk Management -Disabled Secure Boot (Didn't find an option to disable EFI boot) -Disabled Fast Startup The laptop starts the GRUB menu shows up but it doesn't go beyond that no matter what option i choose. After choosing any option the screen goes blank but the power is still on i can see the power light. My laptop is HP-n012tx processor- Intel i5 4200U Video Card- 2GBnVidia 740M The GRUB menu i see http://i.stack.imgur.com/buEAn.png

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• Error when using mailto: link in Mobile Safari in app-capable mode

  - by Elisabeth

  I've got a form in a web page with an action that is "mailto:email" (where email is a real email address). When I load this page in Mobile Safari in regular mode (ie, not launched from home screen with app-capable mode), this works fine - after I submit the form, the email app comes up. However, when I'm in app-capable mode and have launched from the home screen (so, no Safari chrome), and submit the form I get the error "URL can't be shown". However, a regular mailto: link (ie, not in a form) does work when in app-capable mode. Has anyone else noticed this? Any workarounds? Are forms disallowed in app-capable mode? Thanks, Elisabeth

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• Freezing a dual-mode (GUI and console) application using cx_Freeze

  - by Mridang Agarwalla

  Hi, I've developed a Python application that runs both in the GUI mode and the console mode. If any arguments are specified, it runs in a console mode else it runs in the GUI mode. I've managed to freeze this using cx_Freeze. I had some problems hiding the black console window that would pop up with wxPython and so I modified my setup.py script like this: import sys from cx_Freeze import setup, Executable base = None if sys.platform == "win32": base = "Win32GUI" setup( name = "simple_PyQt4", version = "0.1", description = "Sample cx_Freeze PyQt4 script", executables = [Executable("PyQt4app.py", base = base)]) This works fine but now when I try to open up my console and run the executable from there, it doesn't output anything. I don't get any errors or messages so it seems that cx_Feeze is redirecting the stdout somewhere else. Is is possible to get it to work with both mode? Nothing similar to this seems to be documented anywhere. :( Thanks in advance. Mridang

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• System.Windows.Media.RenderCapability.Tier returns not the render mode

  - by happyclicker

  I use System.Windows.Media.RenderCapability.Tier to show the current render mode within a diagnostics panel of my app. If I force the app (3.5sp1) to change the render-mode through the following code HwndSource hwndSource = PresentationSource.FromVisual(visual) as System.Windows.Interop.HwndSource; HwndTarget hwndTarget = hwndSource.CompositionTarget; hwndTarget.RenderMode = renderMode; neither System.Windows.Media.RenderCapability.TierChanged fires, nor has the System.Windows.Media.RenderCapability.Tier property changed. However the changes are applied to the app. If I look with Perforator, the render mode has been changed to the desired mode. Although I’ve found at many locations that System.Windows.Media.RenderCapability.Tier can be used to detect the current render state (also msdn, see this), it seems, System.Windows.Media.RenderCapability only gives information about the capabilities and not about the current mode. That makes also sense if I look at the name of the class. Is there another source to know how an actual wpf-content is rendered or am I doing something wrong?

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• Is System.Windows.Media.RenderCapability the wrong source to detect the current render-mode

  - by happyclicker

  I use System.Windows.Media.RenderCapability.Tier to show the current render mode within a diagnostics panel of my app. If I force the app to change the render-mode through the following code HwndSource hwndSource = PresentationSource.FromVisual(visual) as System.Windows.Interop.HwndSource; HwndTarget hwndTarget = hwndSource.CompositionTarget; hwndTarget.RenderMode = renderMode; neither System.Windows.Media.RenderCapability.TierChanged fires, nor has the System.Windows.Media.RenderCapability.Tier property changed. However the changes are applied to the app. If I look with Perforator, the render mode has been changed to the desired mode. Although I’ve found at many locations that System.Windows.Media.RenderCapability.Tier can be used to detect the current render state (also msdn, see this), it seems, System.Windows.Media.RenderCapability only gives information about the capabilities and not about the current mode. That makes also sense if I look at the name of the class. Is there another source to know how an actual wpf-content is rendered or am I doing something wrong?

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• undefined index mode, which is the variable that case statement is looking for

  - by Brad

  receiving error: PHP Notice: Undefined index: mode in /web/ee_web/include/form-modal.php on line 51 line 51 switch($_GET["mode"]) { block of code it is in: switch($_GET["mode"]) { case "login": login_user(); break; case "logout": session_destroy(); print "<p>You are now logged out.</p>"; print "<p><input type=\"submit\" id=\"closeButton\" name=\"closeButton\" value=\"Close\" onclick=\"self.parent.tb_remove(); parent.location.reload(1);\" /></p>"; break; default: login_user(); //print "<p>How'd you end up here?</p>"; break; } The URL for the page is index.php?mode=logout, that is how I am passing the value into mode. Any way I could resolve this error message?

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• Stronger laptop_mode in Linux

  - by Vi

  Can I have stronger laptop mode in Linux? I want to spin down the hard drive and prevent it to spin up even if something wants to read something not in cache. In general I want to have these modes: Normal Current laptop mode Stronger laptop mode: spin up only when needs to read something uncached (and cache it). No spinups to write something unless really memory pressure (Exception: explicit "sync" command in console). Kernel is allowed to keep processes in D-sleep for 10 seconds for that. Forced laptop mode: do not spin up, period. Keep offending processes in D-sleep unless I turn off this mode. Like there is a bomb instead of hard drive. I also want to have access times tracked (mount -o atime), but I don't want the hard drive to be spinned up only to update them. Is there some settings or kernel patches that can get closer to this? May be I should write special io scheduler for "forced laptop mode"? E.g. echo suspend > /sys/block/sda/queue/scheduler to lock the drive and echo cfq > /ys/block/sda/queue/scheduler to unlock it again?

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• question about STL thread-safe and STL debugging

  - by skydoor

  I have two questions about STL 1) why STL is not thread-safe? Is there any structure that is thread-safe? 2) How to debug STL using GDB? In GDB, how can I print a vector?

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• Why Rails.cache is not thread safe?

  - by Freewind

  I know Rails.cache is ActiveSupport::Cache::MemoryStore, and it is not thread safe. I don't understand, why rails use a thread-unsafe cache as its default? Why not use ActiveSupport::Cache::SynchronizedMemoryStore? In my opinion, in a web site, if a cache is not thread-safe, it almost useless, because the requests are not handled in ONE thread. Do you use Rails.cache in you webapp? And how do you use it?

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• Regarding Google Safe Browsing API

  - by Steve

  Does anyone know how to use the Google safe browsing API. I downloaded the entire the malware and phish update from the google safe browsing using the API key and tried comparing the hash of the suspicious site (md5_file method in php) but it did not work. I also tried comparing the hash of the suspicious site's url (md5 method in php). Am I doing something wrong here?

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• How thread-safe is enum in java?

  - by portoalet

  Hi, How thread-safe is enum in java? I am implementing a Singleton using enum (as per Bloch's Effective Java), should I worry at all about thread safety for my singleton enum? Is there a way to prove or disprove that it is thread safe? // Enum singleton - the preferred approach public enum Elvis { INSTANCE; public void leaveTheBuilding() { ... } } Thanks

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• use inheritance to create a custom, type safe, null safe collection ?

  - by pointlesspolitics

  I am not clear with above statement. It would be great if anybody can explain how we can use inheritance to create a custom, type safe and null safe collection ? Thanks

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• .NET Controls: Why aren't all calls thread-safe?

  - by sheepsimulator

  After exploding with excitement over learning about how to make thread-safe calls to Windows Form Controls, it got me thinking... Why aren't all calls to Windows Form Controls thread-safe? Can anyone explain why? I would think it would reduce a lot of confusion for users of those controls.

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• Safe Cross Thread Signals/Slot C++

  - by JP

  It seem that the only implementation that provide Safe Cross-Thread Signals for both the Signal class and what's being called in the slot is QT. (Maybe I'm wrong?). But I cannot use QT in the project I'm doing. So how could I provide safe Slots call from a different thread (Using Boost::signals2 for example)? Are mutex inside the slot the only way? I think signals2 protect themself but not what's being done inside the slot. Thanks

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• Is Perforce's C++ P4API thread-safe?

  - by Scott Bilas

  Simple question - is the C++ API provided by Perforce thread-safe? There is no mention of it in the documentation. By "thread-safe" I mean for server requests from the client. Obviously there will be issues if I have multiple threads trying to set client names and such on the same connection. But given a single connection object, can I have multiple threads fetching changelists, getting status, translating files through a p4 map, etc.?

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• Thread safe collections in .NET

  - by ripper234

  What is the standard nowadays when one needs a thread safe collection (e.g. Set). Do I synchronize it myself, or is there an inherently thread safe collection?

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• How to edit Registry from another OS Boot up

  - by jack

  Hi I accidentally changed one parameter in Windows and it was crashed and restarted everytime I logon. I can't go with safe mode. Restoring to Known Good Configurations doesn't work too. Unfortunately I don't have system backup. Are there any ways to recover or edit the registry file from another OS or bootable Windows PE? Which tools can I use to edit? Many thanks!

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• OS won’t boot during Visual Studio 2010 install on vista 64

  - by Noam Honig

  I am installing Visual Studio 2010 on a vista 64 bits machine. During the install it asked for a restart. Since that, vista won't load. I tried restore to previous good configuration - didn't help. I am only able to boot it using safe mode with networking. When I did that, it continued the vista part of the install (the screen with the 3 out of 3 updates) but after that when I restarted again - still fails.

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• eclipse tomcat debug mode slow - pegs cpu

  - by andersonbd1

  Running Tomcat through eclipse works fine in non-debug mode, but not in debug mode. When I try to start the Tomcat server in debug mode, the console output looks fine for a while, but then starts slowing down and eventually just stops, pegging the cpu at 100%. I don't think it's relevant, but just in case - here's the console output right about when it starts slowing down and eventually stopping (by stopping I mean no more console output, but still 100% cpu). 2009-09-02 14:35:30,859 INFO NONE org.springframework.context.weaving.DefaultContextLoadTimeWeaver:72 - Found Spring's JVM agent for instrumentation 2009-09-02 14:35:49,562 INFO NONE org.springframework.beans.factory.support.DefaultListableBeanFactory:414 - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@ed889d: defining beans [... 2009-09-02 14:37:31,031 INFO NONE org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean:221 - Building JPA container EntityManagerFactory for persistence unit ... I tried everything I could think of to fix it: cleanesd tomcat working directory restarted eclipse restarted Windows refreshed/cleaned all projects I first had this problem last week using eclipse ganymede. I had been running fine in debug-mode for several months prior to this issue. I didn't make any significant changes to our project that would cause this. Eventually, I upgraded to eclipse galileo which solved my problem. Now 2 days later, I'm having the same problem in galileo. Like I said it works fine in non-debug mode. Any help is much appreciated. I should add that other things work in debug mode - for instance junit tests, so it is something specific to tomcat.

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• "The breakpoint will not currently be hit" error while debugging a mixed mode application (c# and unmanaged c++)

  - by user1678403

  While debugging a mixed mode application in VS2010, the breakpoint set on a line of code contained in an unmanaged c++ dll source file (called from a managed c# wrapper class) shows the infamous "The breakpoint will not currently be hit. No symbols have been loaded for this document" info message when hovering the mouse over the breakpoint on the line in question. The breakpoint itself is a red circle with a yellow info triangle instead of the usual solid red orb. Of course, the breakpoint isn't hit when the debugger is executed. Most answers I've found for this warning indicate the breakpoint hasn't been set properly, or that the expected dll is not being loaded, or that the associated pdb file is not located in the correct location, etc. etc. This is not the problem. The application does load and execute the referenced dll correctly. I've verified that the correct pdb file, with the same file date as its dll, is located in the executable's working directory along with the target dll itself. The debugger simply doesn't load the symbols for the dll, and the dll doesn't show in the Modules list. None of the solutions I've found online work for this problem. The dll doesn't show in the modules list available from 'Debug-Windows-Modules' menu selection... even though it is, in fact, loaded. Breakpoints set in the wrapper class work correctly. Deleting the bin and obj directories, cleaning and rebuilding the solution also doesn't help.

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• Sysprep without audit mode?

  - by askvictor

  In preparing a (windows 7) machine for cloning, does one need to run it in audit mode before installing/customising? I have a customised machine I would like to sysprep and clone, without having to re-create in audit mode. And from where does one run sysprep? Is the command included in the windows distro, or do I need to run it from the AIK, or from a PE environment?

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• Is it safe to disable nmi_watchdog?

  - by Rayne

  I'm using RHEL 6 (kernel 2.6.32-131) and I'm trying to start oprofile, but I keep getting an error. My oprofile version is 0.9.6-12. I was able to successfully do opcontrol --init But when I did a opcontrol --start --no-vmlinux I got the error Using default event: CPU_CLK_UNHALTED:100000:0:1:1 Error: counter 0 not available nmi_watchdog using this resource ? Try: opcontrol --deinit echo 0 > /proc/sys/kernel/nmi_watchdog I don't know if it's safe for me to do this? For what I googled, it seems that nmi_watchdog is used to reboot the system if it hangs, and that sounds like something I want. Also, grep NMI /proc/interrupts shows a bunch of numbers, which I guess indicates that nmi_watchdog is already running? How can I run both oprofile and nmi_watchdog?

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