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• Interpreting Accept Headers as intended in IE and Webkit

  - by Jrgns

  I developed a web app that responds with data in the format as specified by the client in the HTTP Accept Headers. Everything worked fine while using Firefox, but when I wanted to check my CSS / HTML on Chrome and IE, both of them wanted to download the index page, as if it's an unknown content type. After some research I found this article, which states that IE sends out a lot of crud in it's HTTP Accept headers, amongst others a list of image/* content types right at the start. This caused my web app to try to send the index page as an image/jpeg. So how do I know when to ignore and when to use the Accept Headers?

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• Bacula configuration for clients that are turned on and off randomly

  - by Rastloser

  I'm evaluating Bacula as a centralized backup tool for a small network where users will turn machines on and off unpredictably. Some of the headless Linux boxes I need to back up are intended to be turned off by pressing the on/off-button on the case, without any way of telling the user to wait for a backup job to finish. So, we don't know when backup jobs may run (anacron might help with this, right?) and we don't know whether they'll be allowed to finish. Is Bacula a reasonable choice for such an environment?

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• Smoothwall: How to stop live network traffic displayed in terminal?

  - by Jakobud

  For our network we are working on building a new firewall box and we just installed Smoothwall on it to test it out. When I start up the box, before the login prompt even appears, all of the live IP traffic is appearing in the terminal (source/destination IPs, MACs, Ports, etc). I wait for the boot sequence to finish, but all I see is this IP traffic. The login prompt never comes up. I finally get sick of waiting and press CTRL + C and it says "Entering Run Level 3" and then I get a login prompt finally. Once I login, the IP traffic continues to fly through the terminal even as I'm trying to type commands. How do I turn this stuff off? Is this the default setting for Smoothwall to have all this IP traffic going by on the screen? It essentially renders using the terminal to being useless.

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• How do you calculate the storage size of a SimpleDB domain?

  - by C. Dragon 76

  The official documentation states: Raw byte size (GB) of all item IDs + 45 bytes per item + Raw byte size (GB) of all attribute names + 45 bytes per attribute name + Raw byte size (GB) of all attribute-value pairs + 45 bytes per attribute-value pair What is the raw size of an attribute-value pair? Is it precisely the size of the value? (I would expect so, but then why is it worded "attribute-value pair"?) Or is it the size of the attribute name plus the size of the attribute value? (In that case, there would be motivation to give your attributes really short names.) For example, what is the size of the tiny domain below? +---------------------------------------------------------+ | Item Name/ID | "Price" attribute | "Calories" attribute | |--------------+-------------------+----------------------| | "apple" | "0000.43" | "0046" | | "orange" | "0000.70" | "0053" | +---------------------------------------------------------+

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• Stopping/Starting windows services

  - by Geek

  I have four windows services which start up automatically when the machine starts. There after, I want to restart those services every 8 hours in a particular order. For eg. Stop s1,s2,s3,s4 and than restart them in some other order like s4,s3,s2,s1. The condition is that I should wait for each service to stop completely before I stop another one. I would want to write a .BAT or some script. Is it possible to define a CRON for 8 hours, this is not there in Advanced tasks ? Can I do it using windows scheduler ? Please suggest. thanks in advance.

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• How Lenovo x200(x61) tablet is so great for programming? whats up with so low GHz processors for deb

  - by Piddubetskyy

  for best laptop for programming after reading here looks like its Mac vs Lenovo (tablet, because tablet is only why I would choose it over Mac). I do crave that tablet but low speed processor scares me. Intel Core i5 or i7 in Sony Vaio sounds more attractive (2,26 - 3GHz for lower price). Yes, Lenovo can be fast, like x201, but with good specifications its over $2,000 its a little too much. For a lot of development I just don't want to wait every time while program compiles and builds during debugging. I want it fairly fast and smooth. Can anyone advice their experience with Lenovo's tablets?

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• How can I force a subscriber to be synchronized from a local snapshot?

  - by Brian

  Hello, I have a SQL 2005 server replicating(merge\push) to SQL 2005 and SQL 2000 servers. I have multiple subscribers spread througout the United states. I have set , @snapshot_in_defaultfolder = N'false', @alt_snapshot_folder = N'c:\snapshots\Merge\' (sample location). I take the snapshot from the publisher that is in the same location, 'c:\snapshots\Merge\', and copy it to the subscribers. I wanted to avoid applying the snapshot over the WAN but from the performance I am getting the synchronization is going over the WAN. Does anybody have any ideas how to make sure that I am using the local copy of the snapshot and not the copy at the publisher? Thanks

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• Power outage, Server 2K3 remains on "applying computer settings"

  - by syuroff

  My reward for clicking the "test" button in the APC UPS software was that it completely cut the power to my SQL server. The server promptly rebooted, the SQL service is running (verified by the app on another server that queries it), but the GUI has remained on "applying computer settings" for 20 minutes and counting, and it forbids RDC connections. Since SQL is up, it is fulfilling its key role, but it's obviously not right. What step to take next? Wait longer? Hardware is a Dell Poweredge 2850, internal RAID10.

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• Windows Mobile 6.5 GPS Device - WaitForMultipleObjects returns 258 (timeout)

  - by wizmagister

  I’ve created a GPS program that track positions in realtime in the background for Windows mobile 6.1 in 2008-2009. It ran fine on these devices for many years. For some reason, the same code never worked perfectly on Windows Mobile 6.5. After many hour of operations (mostly when nobody use the device), I receive a “Timeout” (code 258) from the function "WaitForMultipleObjects": this.GPSEvent_WaitValue = WaitForMultipleObjects(2, this.GPSEvent_Handles, 0, 45000); Again, this can work for hours and suddenly, it's just impossible to get another position without : UPDATE: - Restarting the device (GoogleMap confirms that there's no GPS device present!) It has something to do with Windows Mobile going to sleep and slowing up my thread. Here's the core code (adapted from Microsoft SDK Sample): /// <summary> /// When "WindowsMobile" wake up the program to check for a new position /// </summary> private void OnNextGPSEvent_Callback() { int SecondsToNextWakeUp = ETL.Mobile.Device.ScheduledCallback.MINIMUM_SECONDTONEXTWAKEUP; switch (this.SleepingState) { case SleepingStateType.SleepingForNextPosition: // Get position this.GPSEvent_WaitValue = (WaitForEventThreadResultType)WaitForMultipleObjects(2, this.GPSEvent_Handles, 0, 45000); switch (this.GPSEvent_WaitValue) { case WaitForEventThreadResultType.Event_LocationChanged: // Got a new position this.FireLocationChanged(this.GetCurrentPosition()); // Manage device shutdown (save battery) if (this.PositionFrequency > MIN_SECONDS_FREQUENCY_FORDEVICE_SHUTDOWN) { // Close device this.CloseDevice(); SecondsToNextWakeUp = (this.PositionFrequency - GPSDEVICE_LOAD_SECONDS_LOAD_TIME); this.SleepingState = SleepingStateType.SleepingBeforeDeviceWakeUp; } else { // Default Wait Time this.SleepingState = SleepingStateType.SleepingForNextPosition; } break; case WaitForEventThreadResultType.Event_StateChanged: break; case WaitForEventThreadResultType.Timeout: case WaitForEventThreadResultType.Failed: case WaitForEventThreadResultType.Stop: // >>>>>>>>>>>>>> This is where the error happens <<<<<<<<<<<<<<<<<<<<<<<<<<< // >>>>>>>>>>>>>> This is where the error happens <<<<<<<<<<<<<<<<<<<<<<<<<<< // >>>>>>>>>>>>>> This is where the error happens <<<<<<<<<<<<<<<<<<<<<<<<<<< // Too many errors this.ConsecutiveErrorReadingDevice++; if (this.ConsecutiveErrorReadingDevice > MAX_ERRORREADINGDEVICE) { this.CloseDevice(); SecondsToNextWakeUp = (this.PositionFrequency - GPSDEVICE_LOAD_SECONDS_LOAD_TIME); this.SleepingState = SleepingStateType.SleepingBeforeDeviceWakeUp; } else { // Default Wait Time this.SleepingState = SleepingStateType.SleepingForNextPosition; } break; } #endregion break; case SleepingStateType.SleepingBeforeDeviceWakeUp: this.OpenDevice(); SecondsToNextWakeUp = GPSDEVICE_LOAD_SECONDS_LOAD_TIME; this.SleepingState = SleepingStateType.SleepingForNextPosition; break; } if (this.IsListeningGPSEvent) { // Ajustement du prochain rappel this.NextGPSEvent_Callback.SecondToNextWakeUp = SecondsToNextWakeUp; this.NextGPSEvent_Callback.RequestWakeUpCallback(); } } /// <summary> ///Create Thread /// </summary> private void StartListeningThreadForGPSEvent() { // We only want to create the thread if we don't have one created already and we have opened the gps device if (this._GPSEventThread == null) { // Create and start thread to listen for GPS events this._GPSEventThread = new System.Threading.Thread(new System.Threading.ThreadStart(this.ListeningThreadForGPSEvent)); this._GPSEventThread.Start(); } } private void ListeningThreadForGPSEvent() { this.GPSEvent_WaitValue = WaitForEventThreadResultType.Stop; this.IsListeningGPSEvent = true; // Allocate handles worth of memory to pass to WaitForMultipleObjects this.GPSEvent_Handles = Helpers.LocalAlloc(12); Marshal.WriteInt32(this.GPSEvent_Handles, 0, this._StopHandle.ToInt32()); Marshal.WriteInt32(this.GPSEvent_Handles, 4, this._NewLocationHandle.ToInt32()); Marshal.WriteInt32(this.GPSEvent_Handles, 8, this._GPSDeviceStateChanged.ToInt32()); this.Start_NextGPSEvent_Timer(this.PositionFrequency); this.SleepingState = SleepingStateType.SleepingBeforeDeviceWakeUp; this.OnNextGPSEvent_Callback(); }

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• Black flicker while resizing translucent Qt widget (only when Aero is enabled)?

  - by D.

  I have a top-level Qt widget with the FramelessWindowHint flag and the WA_TranslucentBackground attribute set. It has several children, each of which draws an image on it. They are not in a layout. Instead, I simply move them around when something changes (it is not user-resizable). There are two states to the window - a big state and a small state. When I switch between them, I resize the window and reposition the children. The problem is that as the window resizes, a black box is briefly flashed on the top-level window before the images are painted over it. The problem goes away if I disable Aero. I found brief mention of this problem being fixed in an article describing a new release of Qt (this release is long past), but it still doesn't work. Any ideas why? Thanks!

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• Keep IMAP messages locally when deleted remotely

  - by user74328

  I use my email from my phone and my computer via IMAP. I want to set something up so that if I delete a message via my phone, my computer will still keep the message locally. For example, assume I leave my computer on, with a synchronize interval of 5 minutes. I want to be able to send something from my phone, wait 5 minutes to be sure my computer has downloaded the item from the Sent folder, then delete it from the IMAP sent folder via my phone, but have the computer at home keep it's copy. Is this possible with any readily available email clients out there? I have Thunderbird and Outlook at the moment, but would be willing to learn a new interface for this feature. How can I accomplish this?

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• Git completion __git_ps1 really slow on Mac

  - by mckeed

  I've had __git_ps1 in my bash prompt for a while, but just recently (I noticed it after I did some messing around with Homebrew and rbenv), it has slowed down my prompt horribly. When I'm in a git directory I have to wait 3-4 seconds after every command for the prompt to appear. If I just mash return and watch the Activity Monitor, it shows that distnoted and Finder are using more CPU than normal during the delay. Could something git-completion.bash is doing be triggering a notification to Finder? Maybe it involves folder actions or something?

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• CSMA between APs in same channel & different SSID ?

  - by Ranganathan

  Would be great if someone clarifies this doubt. Lets assume two Wireless Access Points AP1 & AP2 with these conditions 1. both in the same 802.11 standard 2. same channel 3. using different SSIDs (just like in adjacent apartment houses). In this case, do these two Access points (and the clients associated to them) coordinate via CSMA/CA ? ie., if one of the AP's or a client station is about to transmit, does it wait & observe the other AP's & its clients' transmission before sending the frame in air ? Also, do the clients associated with these different APs coordinate via CSMA/CA ?

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• Reading bytes from JavaScript string

  - by Jan

  I have a string containing binary data in JS. Now I want to read, for example, an integer from it. So I get the first 4 characters, use charCodeAt, do some shifting etc. to get an integer. Problem is that strings in JS are UTF-16 (instead of ASCII) and charCodeAt often returns values higher than 256. The Mozilla reference states that "The first 128 Unicode code points are a direct match of the ASCII character encoding." (what about ASCII values 128?) How can I convert the result of charCodeAt to an ASCII value? Or is there a better way to convert a string of four characters to a 4 byte integer?

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• tricks for speeding up tar while tarring up a huge directory of little files?

  - by Trevor Harrison

  I'm trying to tar up a directory that has about 3M tiny files in it. Tar is chugging along, but I'm thinking its going to take longer than I can wait. I'm wondering if telling tar to not store metadata (owner, group, perms) would reduce the churn on reading and re-reading this huge directory and maybe speed things up, and if there is a tar switch that does this. My initial perusal of the man page only gets me something like --no-xattrs, which looks like a start, but I was hoping someone had some specific knowledge.

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• Is it possible to put only the boot partition on a usb stick?

  - by Steve V.

  I've been looking at system encryption with ArchLinux and i think I have it pretty much figured out but I have a question about the /boot partition. Once the system is booted up is it possible to unmount the /boot partition and allow the system to continue to run? My thought was to install /boot to a USB stick since it can't be left encrypted and then boot from the USB stick which would boot up the encrypted hard disk. Then I can take the USB key out and just use the system as normal. The reason I want to do this is because if an attacker was able to get physical access to the machine they could modify the /boot partition with a keystroke logger and steal the key and if they already had a copy of the encrypted data they could just sit back and wait for the key. I guess I could come up with a system of verifying that the boot has been untouched at each startup. Has this been done before? Any guidance for implementing it on my own?

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• WebMethod Return xml

  - by BabelFish

  I keep reading how everyone states to return XmlDocument when you want to return XML. Is there a way to return raw XML as a string? I have used many web services (written by others) that return string and the string contains XML. If you return XmlDocument how is that method consumed by users that are not on .Net? What is the method to just return the raw XML as string without it having being wrapped with <string></string> Thanks!

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• C++ and preprocessor macro gotcha

  - by aaa

  hello. Appologies for yet another gotcha question. Can you figure out what is wrong with the statement below? gcc error states: "type name declared as function returning array". #define MACRO(a) (a)[1] class index { typedef int index_type[2]; index_type& operator[](int i); }; int k = 0; int i = MACRO(index()[k]); ps: is such questions are deemed too annoying, I am going to stop.

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• Automatic VisualState Manager in Silverlight

  - by Matt

  If you create a simple button and then choose Edit Template - Edit a Copy, Blend will automatically generate a style area, along with all the button states (MouseEnter, MouseLeave, Pressed, etc). No where in the code behind or auto generated style area does it say that on a "MouseOver" event, change the state to "MouseOver", but it still manages to work! Is the only way to change a button's state have to be done the code behind using the VisualStateManager.GoToState method, or can you change it much like CSS does (a:hover) using the VisualStateManager? From my experience, setting just doesn't seem to do the trick.

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• google salve - maven

  - by chris-gr

  Hi all, I tried to install google salve http://code.google.com/p/salve/ by adding following statements in the project's pom file: However, when running mvn dependency:resolve it states "unable to find resource "salve:salve:jar:2.0" in repository salve What's wrong? <dependency> <groupId>salve</groupId> <artifactId>salve</artifactId> <version>2.0</version> </dependency> <repository> <id>salve</id> <name>Google Maven Repository</name> <url>http://salve.googlecode.com/svn/maven2/</url> </repository>

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• Setting CPU cores off-limits to all threads not specified (preferably in Windows 7)

  - by Shinrai

  I have a really specific machine configuration in the works that would really be helped out if there were any way to do this...basically what I'm looking for is the opposite of setting CPU Affinity for a process. I want to be able to tell Windows "No applications except [x] are allowed on [these cores]." Is there any mechanism whatsoever for doing this? (Yes, I am aware of some of the potential issues this could cause and I normally would never fool with processor affinities, since the OS usually does a damned good job itself, but this is a pretty odd situation involving some software that is very CPU-bound constantly having to wait on interrupts and DPCs and things from other threads.)

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• Representing a very large array of bits in little memory

  - by user614624

  Hello, I would like to represent a structure containing 250 M states(1 bit each) somehow into as less memory as possible (100 k maximum). The operations on it are set/get. I cold not say that it's dense or sparse, it may vary. The language I want to use is C. I looked at other threads here to find something suitable also. A probabilistic structure like Bloom filter for example would not fit because of the possible false answers. Any suggestions please?

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• C++: is it safe to read an integer variable that's being concurrently modified without locking?

  - by Hongli

  Suppose that I have an integer variable in a class, and this variable may be concurrently modified by other threads. Writes are protected by a mutex. Do I need to protect reads too? I've heard that there are some hardware architectures on which, if one thread modifies a variable, and another thread reads it, then the read result will be garbage; in this case I do need to protect reads. I've never seen such architectures though. This question assumes that a single transaction only consists of updating a single integer variable so I'm not worried about the states of any other variables that might also be involved in a transaction.

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• How do I know if my disks are being hit with too much IO reads or writes or both?

  - by Mark F

  Hi All, So I know a bit about disk I/O and bottlenecks relating to this especially when relating to databases. But how do I really know what the max IO numbers will be for my disks? What metric might be available to me for working out roughly (but needs to be a good approximation) of how much capacity (if you will) have I got left available in I/O. I've seen it before where things are bubbling along nicely and then all of a sudden, everything screams to a halt, and it ends up being an IO bound problem. Is there a better way to predict when IO is reaching its limits? This article was interesting but not giving the answer I desire. "http://serverfault.com/questions/61510/linux-how-can-i-see-whats-waiting-for-disk-io". So is my best bet surrounding just looking at 'CPU IO WAIT'? There must be a more reactive method for this? Best, M

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• WPF C#: Starting crash due to client 'Region and Language' settings

  - by FrieK

  Hi, I'm working on a WPF C# application, and it seems to crash with a few random people. So eventually I found out it was the 'Region and Language' settings that was responsible. For example, if I were to set my Format to English (United States) it will work, if I set it to Swedish (Sweden) it will crash from the start. When I test this in Visual Studio 2010 it gives error 'TypeInitializationException'. More precisely it does it here (it doesn't get passed the InitializeComponent() void): private void RadioButton_Checked(object sender, RoutedEventArgs e) { Info.SortOrder = SortBy.Rank; } It claims the error at the first line, which is just setting an enum value to a variable. I guess it's just doing it there because it's the first thing it makes, or something. Anyone has any idea how to fix this? I've searched around but can't seem to find out how :( Any help is much appreciated! Thanks

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