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• IIS won't start

  - by doekman

  When I startup my computer, pages from my local webserver (IIS) won't load. In the event viewer(System log) I get the error below. The only way I get IIS to work again is to issue an iisreset.exe. I have Windows XP. Any ideas to fix this? Event Type: Warning Event Source: W3SVC Event Category: None Event ID: 36 Date: 27-4-2010 Time: 10:30:47 User: N/A Computer: NLD4P4Z2J Description: The server failed to load application '/LM/W3SVC'. The error was '8007045b'. For additional information specific to this message please visit the Microsoft Online Support site located at: http://www.microsoft.com/contentredirect.asp. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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• Recommended method for XML level loading in XNA

  - by David Saltares Márquez

  I want to use Blender as my level designer tool for an XNA game. Using an existing plugin, I can export my levels to DotScene format which is basically an xml file like this one: <scene formatVersion="1.0.0"> <nodes> <node name="scene-staircase.001"> <position x="10.500000" y="1.400000" z="-9.600000"/> <quaternion x="0.000000" y="0.000000" z="-0.000000" w="1.000000"/> <scale x="1.000000" y="1.000000" z="1.000000"/> <entity name="scene-staircase.001" meshFile="staircase.mesh"/> </node> <node name="Lamp.003"> <position x="11.024290" y="5.903862" z="9.658987"/> <quaternion x="-0.284166" y="0.726942" z="0.342034" w="0.523275"/> <scale x="1.000000" y="1.000000" z="1.000000"/> <light name="Spot.003" type="point"> <colourDiffuse r="0.400000" g="0.154618" b="0.145180"/> <colourSpecular r="0.400000" g="0.154618" b="0.145180"/> <lightAttenuation range="5000.0" constant="1.000000" linear="0.033333" quadratic="0.000000"/> </light> </node> ... </nodes> </scene> Using naming conventions I could easily parse the file and load the correspondent in game content. I am new to XNA and I have seen that there are several methods to load XML files into a game like serializing and deserializing. Which one would you recommend?

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• What response should be made to a continued web-app crack attempt?

  - by Tchalvak

  I've issues with a continuous, concerted cracking attempt on a website (coded in php). The main problem is sql-injection attempts, running on a Debian server. A secondary effect of the problem is being spidered or repeatedly spammed with urls that, though a security hole has been closed, are still obviously related attempts to crack the site, and continue to add load to the site, and thus should be blocked. So what measures can I take to: A: Block known intruders/known attack machines (notably making themselves anonymous via botnet or relaying servers) to prevent their repeated, continuous, timed access from affecting the load of the site, and B: report & respond to the attack (I'm aware that the reporting to law enforcement is almost certainly futile, as may be reporting to the ip/machine where the attacks are originating, but other responses to take would be welcome).

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• Windows Server Configuration with Exchange, SQL Express and IIS

  - by Reafidy

  In our small office we are currently running a standalone tower server with WS 2008 R2, SQL Express and IIS. This server is going to be decommissioned and scrapped as its old and very noisy. We are going to purchase a new server with WS 2012 Standard and a heap of ram. It will still be a standalone server so it will be a domain controller, have SQL Express and IIS installed. We intend to install the hyper-v role and host a second virtual server to distribute the load. We are a small company and have only 15 staff members so its not a huge load on the server. Can a single server handle this type of installation, we don't want to purchase two servers. If so how should it be configured with regard to which software packages should be virtualized(if any). Redundancy is not a huge issue for us.

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• linux firefox flash debug: i don't get alerts when errors occur

  - by ufk

  Hello. I use firefox 3.6.13 on linux gentoo amd64 and flash 10.2 debug version, i also have firebug flashbug and flashfirebug installed. my problem is that whenever I run a flash application that encounters an error, the browser does not open an alert window. it makes it more difficult to debug applications because i need to make sure that the firebug window is always opened. the only way i can see the error is if i open the flash tab in firebug. is there a way to change this behavior ? i checked .xsession-errors and tried running firefox from console: these are the only errors the i see in the log and these errors do not appear when the flash app encounters an error which means they are not related: Gtk-Message: Failed to load module "canberra-gtk-module": libcanberra-gtk-module.so: cannot open shared object file: No such file or directory Gtk-Message: Failed to load module "gnomebreakpad": libgnomebreakpad.so: cannot open shared object file: No such file or directory thanks

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• Mono on Linux: Apache or Nginx

  - by Furism

  Hi, I'm developing an ASP.NET application that will be run under Linux/Mono for various reasons (mostly to stay away from IIS, quite frankly). Of course the first web server I had in mind was Apache. But Apache, for all its advantages, adds a lot of overhead. Also, the application I'm building needs to be highly scalable and performance is one of the main concern. Apache has, obviously, a very good reputation and its record speaks for itself, but I don't need things like Reverse Proxy or Load Balancing because dedicated network devices would be used for that. So those modules from Apache will never be used. So basically my question is: since Nginx seems to fit exactly needs, is there any caveat I should be aware of? For instance, is Nginx renowned to be particularity safe? When security flaws are detected, how fast are they patched? Any insight on the pros and cons of using either of those servers in conjunction with Mono is welcome.

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• Stack-based keyboard delay using Logitech MX3100 keyboard

  - by Mark S. Rasmussen

  I've been using a Logitech Cordless Desktop MX3100 keyboard for quite a while. I've never really had any problems, except for the occasional typo. I noticed however that I tended make the typo "Laod" instead of "Load", quite a bit more often than any other typos. As it started to get on my nerves, I decided to do some testing. What I found out was than when I write lowercase "load", I'd never make the typo. All uppercase, or just uppercase L, I'd make the typo quite often. My actual (very scientific) testing is probably best described by showing the output: moatmoatmoat MoatMoatMoat loatloatloat LaotLaotLaot loafloafloaf LaofLaofLaof hoathoathoat HoatHoatHoat hoadhoadhoad HoadHoadHoad lortlortlort LrotLrotLrot What i found out was that whenever shift was depressed, typing an uppercase "L" would induce a significant lag if the next character was an "o", compared to the lag of the any other key: High "o" lag: LoLoLoLoLoLo No "a" lag: LaLaLaLaLaLa No lag for neither "o" nor "a": lolololololo lalalalalala By realizing this I regained a slight bit of sanity as I knew I wasn't coming down with a case of Parkinsons. I was actually typing correctly, the lag just interpreted it wrongly. Now, what really bugs me is that I can't fathom how this is occurring. What I'm actually typing, in physical order, is this: L - o - a - d, and yet, the "a" is output before the "o", even though "o" was pressed before "a". So while the keyboard is processing the "Lo" combo, the "a" gets prioritized and is inserted before the "o" is done processing, resulting in Laod instead of Load. And this only happens when typing "Lo", not when typing lowercase "lo". This problem could stem from the keyboard hardware, the receiver hardware or the keyboard software driver. No matter the fault location however, I can't imagine how this could be implemented as anything but a FIFO queue. A general delay, sure, I could live with that, albeit I'd be irritated. But a lag affecting different keys differently, and even resulting in unpredictable outcome - that just doesn't make any sense. I've solved the problem by just switching to a wired keyboard. I just can't shake it off me though; what kind of bug/error/scenario would result in a case like this? Edit: It's been suggested that I stop drinking Red Bull and stick to water instead. While that may actually help solve the issue, I'm really not looking for a solution as such. I'm more interested in an explanation of how this could happen, as I can't imagine any viable technical solution that could result in this behavior.

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• nginx + php-fpm “504 Gateway Time-out” after compiling with curl support

  - by Brian

  We recently switched to managing php with php-fpm. It was working great, but is now giving me issues. The most recent change was to install libcurl-devel and re-compile php (5.3.3) using --with-curl. Now I'm getting 504 timeouts with nginx and the pages won't load. HTML pages load fine, phpinfo() loads as well. Tried backing out the changes and re-compiling without curl support, but still not having any luck. Also tried adjusting request_terminate_timeout per some of the other posts here on SF without change. This is on a test machine that has no other clients hitting it. I also tried switching to unix socket instead of tcp--same result. What am I missing here? Am I barking up the wrong tree with curl?

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• Trouble with cross network permissions for an image through iis7 in an asp.net virtual directory

  - by EdenMachine

  I have load balanced web servers My web application has a function that allows the user to upload their company logo to display in the application header obviously, when they upload the logo image file, it needs to be in a central location or otherwise, the file will not be accessible to the other server on the load balancer. in order to be able to upload the image through the application other on one of either servers and then display it on both servers I need a virtual directory in IIS on both servers that point to a third "file server" (this is the "AcctData" directory shown below with a sub folder "images") the problem is that no matter what I do, I run into a permissioning issue If I use pass-through authentication I get a 401 error. If I use a specific user that's set up on both boxes, I get a 500 error. The "Default" application under "CP" (shown in the image below) uses an AppPool that is a Domain Account that has admin permissions on all the servers. I've also tried sticking a Web.config file in the "AcctData" directory allowing anonymous access. Nothing is working though.

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• Merge sort versus quick sort performance

  - by Giorgio

  I have implemented merge sort and quick sort using C (GCC 4.4.3 on Ubuntu 10.04 running on a 4 GB RAM laptop with an Intel DUO CPU at 2GHz) and I wanted to compare the performance of the two algorithms. The prototypes of the sorting functions are: void merge_sort(const char **lines, int start, int end); void quick_sort(const char **lines, int start, int end); i.e. both take an array of pointers to strings and sort the elements with index i : start <= i <= end. I have produced some files containing random strings with length on average 4.5 characters. The test files range from 100 lines to 10000000 lines. I was a bit surprised by the results because, even though I know that merge sort has complexity O(n log(n)) while quick sort is O(n^2), I have often read that on average quick sort should be as fast as merge sort. However, my results are the following. Up to 10000 strings, both algorithms perform equally well. For 10000 strings, both require about 0.007 seconds. For 100000 strings, merge sort is slightly faster with 0.095 s against 0.121 s. For 1000000 strings merge sort takes 1.287 s against 5.233 s of quick sort. For 5000000 strings merge sort takes 7.582 s against 118.240 s of quick sort. For 10000000 strings merge sort takes 16.305 s against 1202.918 s of quick sort. So my question is: are my results as expected, meaning that quick sort is comparable in speed to merge sort for small inputs but, as the size of the input data grows, the fact that its complexity is quadratic will become evident? Here is a sketch of what I did. In the merge sort implementation, the partitioning consists in calling merge sort recursively, i.e. merge_sort(lines, start, (start + end) / 2); merge_sort(lines, 1 + (start + end) / 2, end); Merging of the two sorted sub-array is performed by reading the data from the array lines and writing it to a global temporary array of pointers (this global array is allocate only once). After each merge the pointers are copied back to the original array. So the strings are stored once but I need twice as much memory for the pointers. For quick sort, the partition function chooses the last element of the array to sort as the pivot and scans the previous elements in one loop. After it has produced a partition of the type start ... {elements <= pivot} ... pivotIndex ... {elements > pivot} ... end it calls itself recursively: quick_sort(lines, start, pivotIndex - 1); quick_sort(lines, pivotIndex + 1, end); Note that this quick sort implementation sorts the array in-place and does not require additional memory, therefore it is more memory efficient than the merge sort implementation. So my question is: is there a better way to implement quick sort that is worthwhile trying out? If I improve the quick sort implementation and perform more tests on different data sets (computing the average of the running times on different data sets) can I expect a better performance of quick sort wrt merge sort? EDIT Thank you for your answers. My implementation is in-place and is based on the pseudo-code I have found on wikipedia in Section In-place version: function partition(array, 'left', 'right', 'pivotIndex') where I choose the last element in the range to be sorted as a pivot, i.e. pivotIndex := right. I have checked the code over and over again and it seems correct to me. In order to rule out the case that I am using the wrong implementation I have uploaded the source code on github (in case you would like to take a look at it). Your answers seem to suggest that I am using the wrong test data. I will look into it and try out different test data sets. I will report as soon as I have some results.

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• Getting HAPROXY to redirect http to https in users browser session

  - by Jon

  We are currently using a Internet cloud provider to host our SaaS platform. The platform consists of a Firewall - Cloud Provider SLB - - Apache Web Server - HAPROXY SLB - Liferay Platform We have had to use HAPROXY because of an issue with the cloud providers SLB that meant we were unable to use it for load balancing the Liferay platform applications. I have implemented HAPROXY in our secure tier and that seems to do the trick of load balancing the requests quite adequately. However during testing we encountered a functional issue whereby selecting a sub-menu from the web portal resulted in the application hanging, using an http analyser we saw that the request being passed back to the users browser was in http, from discussing this with the software vendor it transpires that the Liferay application has some hard-coded http links, and that other customers have worked around this by using physical NLB's such as F5 and redirecting the http traffic to https. The entry in the HAPROXY logs reads: haproxy[2717]: haproxy[2717]: <Apache Web Agent>:37957 [11/Apr/2013:08:07:00.128] http-uapi uapi/<ServerName> 0/0/0/9/10 200 4912 - - ---- 4/2/1/2/0 0/0 "GET /servicedesk/controller?docommand=renderradform&!key=esd_sfb001_frm_feedback_forms_list&isportalintegratedmode=true&USR=joe.bloggs%40gmail.com&_dc=1365667773097&redirecturl=controller%3Fdocommand%3Drenderbody%26%21key%3DESD_SFB001_FRM_FEEDBACK_FORMS_LIST%26isportalintegratedmode%3Dtrue&sso_token=ALiYv2UqzLsAhSw1ZchRDlCHlq44Bhj9&ONERROR=%2Fweb%2Fjsp%2Fapps%2Fportal-integration-error.jsp&itype=login&slicetoken=NW51O%242aRo%2C_Zz%2476P_9DTtnFmz6%28bhk&AUTOFORWARDURL=controller%3Fdocommand%3Drenderbody%26%21key%3DESD_SFB001_FRM_FEEDBACK_FORMS_LIST%26isportalintegratedmode%3Dtrue&LOGINPAGE=https%3A%2F%2F<FQDN of Web Portal>%2Fweb%2F4732cf01-82c3-4bc5-b6c9-552253e672cf%2Fworkflow-tools&appid=1&!uid=1&!redownloadToken=7.0.3.1.1363611301.0&userlocale=en_US&!datechanged=2012-05-18%2015:05:31.38 HTTP/1.1" :37957 [11/Apr/2013:08:07:00.128] http-uapi uapi/<ServerName> 0/0/0/9/10 200 4912 - - ---- 4/2/1/2/0 0/0 "GET /servicedesk/controller?docommand=renderradform&!key=esd_sfb001_frm_feedback_forms_list&isportalintegratedmode=true&USR=joe.bloggs%40gmail.com&_dc=1365667773097&redirecturl=controller%3Fdocommand%3Drenderbody%26%21key%3DESD_SFB001_FRM_FEEDBACK_FORMS_LIST%26isportalintegratedmode%3Dtrue&sso_token=ALiYv2UqzLsAhSw1ZchRDlCHlq44Bhj9&ONERROR=%2Fweb%2Fjsp%2Fapps%2Fportal-integration-error.jsp&itype=login&slicetoken=NW51O%242aRo%2C_Zz%2476P_9DTtnFmz6%28bhk&AUTOFORWARDURL=controller%3Fdocommand%3Drenderbody%26%21key%3DESD_SFB001_FRM_FEEDBACK_FORMS_LIST%26isportalintegratedmode%3Dtrue&LOGINPAGE=https%3A%2F%2F<FQDN of Web Portal>%2Fweb%2F4732cf01-82c3-4bc5-b6c9-552253e672cf%2Fworkflow-tools&appid=1&!uid=1&!redownloadToken=7.0.3.1.1363611301.0&userlocale=en_US&!datechanged=2012-05-18%2015:05:31.38 HTTP/1.1" The corresponding HTTP browser entry shows: http://<FQDN of ServiceDesk>/servicedesk/controller?docommand=renderradform&!key=esd_org019_frm_contact_list&isportalintegratedmode=true&USR=joe.bloggs%40gmail.com&_dc=1365665987887&redirecturl=controller%3Fdocommand%3Drenderbody%26%21key%3DESD_ORG019_FRM_CONTACT_LIST%26isportalintegratedmode%3Dtrue&sso_token=3NxsXYORMPp32SwL8ftVUCMH2QdWLH82&ONERROR=%2Fweb%2Fjsp%2Fapps%2Fportal-integration-error.jsp&itype=login&slicetoken=NW51O%242aRo%2C_Zz%2476P_9DTtnFmz6%28bhk&AUTOFORWARDURL=controller%3Fdocommand%3Drenderbody%26%21key%3DESD_ORG019_FRM_CONTACT_LIST%26isportalintegratedmode%3Dtrue&LOGINPAGE=https%3A%2F%2F<FQDN of Web Portal>>%2Fweb%2F4732cf01-82c3-4bc5-b6c9-552253e672cf%2Fapplication-setup&appid=1&!uid=1&!redownloadToken=7.0.3.1.1363611301.0&userlocale=en_US&!datechanged=2012-10-26%2019:00:25.08 From reading through the forums and other sites it looks like we should be use to use HAPROXY to redirect the traffic to https, but try as I might I cant get it to work. This is our HAPROXY configuration: global log 127.0.0.1 local2 chroot /var/lib/haproxy pidfile /var/run/haproxy.pid maxconn 4000 user haproxy group haproxy daemon stats socket /var/lib/haproxy/stats defaults mode http log global option httplog option dontlognull option http-server-close option forwardfor except 127.0.0.0/8 option redispatch retries 3 timeout http-request 10s timeout queue 1m timeout connect 10s timeout client 1m timeout server 1m timeout http-keep-alive 10s timeout check 10s maxconn 3000 frontend http-openfire bind *:7070 default_backend openfire backend openfire balance roundrobin server <serverName> <IPv4 Address>:7070 check server <serverName> <IPv4 Address>:7070 check frontend http-uapi bind *:7080 default_backend uapi backend uapi balance roundrobin server <serverName> <IPv4 Address>:7080 check server <serverName> <IPv4 Address>:7080 check frontend http-sec bind *:8080 default_backend sec backend sec balance roundrobin server <serverName> <IPv4 Address>:8080 check server <serverName> <IPv4 Address>:8080 check frontend http-wall bind *:9080 default_backend wall backend wall balance roundrobin server <serverName> <IPv4 Address>:9080 check server <serverName> <IPv4 Address>:9080 check frontend http-xmpp bind *:9090 default_backend xmpp backend xmpp balance roundrobin server <serverName> <IPv4 Address>:9090 check server <serverName> <IPv4 Address>:9090 check frontend http-aim bind *:10080 default_backend aim backend aim balance roundrobin server <serverName> <IPv4 Address>:10080 check server <serverName> <IPv4 Address>:10080 check frontend http-servicedesk bind *:8081 default_backend servicedesk backend servicedesk balance roundrobin server <serverName> <IPv4 Address>:8081 check server <serverName> <IPv4 Address>:8081 check listen stats :1936 mode http stats enable stats hide-version stats realm Haproxy\ Statistics stats uri / stats auth haproxy:<Password> I have tried following the articles listed posted on http://stackoverflow.com/questions/13227544/haproxy-redirecting-http-to-https-ssl and http://parsnips.net/haproxy-http-to-https-redirect/ but that hasn't made any difference. Am I on the right track with this or are we trying to achieve the impossible?, I'm hoping I'm just being an idiot and one of you good people can point me in the right direction.

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• How to test web application performance from other continent?

  - by Thomas Einwaller

  We are hosting our web application http://timr.com on a server located in Germany. The server handles a high load of traffic very well and everything works as desired in terms of performance and load times. However we sometimes get complaints from our overseas users (US, South America) that the experience slow page loading times. What would be the best way to test the performance of a web application "as if you are on another continent"? I want to make sure that the distance between the server and the user is no problem?

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• Web Fonts in Firefox behind Squid

  - by sinping

  It appears as though Firefox requests web fonts (specifically Google's) in a different manner than other browsers. They fail to load when behind Squid as a result, and I'm trying to isolate why. Using this page as a reference in various browsers, Firefox noticeably displays it differently. In the Squid logs, you see hits like this: TCP_DENIED/407 3292 GET http://themes.googleusercontent.com/font? - NONE/- text/html If you load the same page with IE, you see hits like this: TCP_DENIED/407 4389 GET http://themes.googleusercontent.com/static/fonts/federant/v1/C109bUmZeyhh-vIXq9lNfvesZW2xOQ-xsNqO47m55DA.woff - NONE/- text/html So why the difference and how can we make it play nice with Firefox? This is running Squid 3.1.15, but also tested with a few other 3.1.x versions.

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• Sar data not collected for 10 minutes

  - by Ichorus

  We have a RedHat server whose only job is to run a JBoss server. Monitors said that memory usage spiked (we have the JVM limited to far less than the total memory on the system) and JBoss crashed. We restarted and everything seems ok now. Odd thing is that sar data for 10 min leading up to the crash is simply not there. Load average got up to the 50s. I have seen severely busy systems (350+ Load Average) still collect sar data. Does anyone have any idea what could cause sar to stop collecting data?

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• Where is the bottleneck?

  - by jsymon

  There is a limit on connections somewhere along the line here... On a windows server 2008 machine, each request to a url running on localhost takes ~3 seconds to complete. This is fine and normal for the url. However, if i open the same localhost url in about 10 tabs, and set them to reload all at the same time, they finish sequentially, 3 seconds after each other. Meaning the last tab has taken 30 seconds to load (3s x 10). What is especially odd is that firebug reports each page as taking 3seconds to load. Another point to add is that the status bar just sits at 'done' for the last tab until 3 seconds before completing, where it then changes to 'waiting for localhost'. I am praying there is some connection limit somewhere otherwise this would be a disaster if more than one user ever visited the site at a time! Maybe a limit or something where one pc cant make more than 2 simultaneous requests to a url at a given time?

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• XP Computer won't start (Missing/Corrupt 'System' file) - recently added new hard drive

  - by qwerty2

  Hi all, Pulling my hair out here. I recently replaced my D: 1TB drive (not a system drive) with a new 1.5TB drive. I loaded Windows XP, formatted the new drive and it was showing as working fine, alongside my C: windows system drive. I restart my machine and all of a sudden, Windows doesn't load and instead I get: "Windows could not start beause the following file is missing or corrupt" \WINDOWS\SYSTEM32\CONFIG\SYSTEM I don't have the original XP installation CD, although I do have another copy of XP, when I try and boot to it, I get the blue 'STOP' screen after it attempts to load the setup utlity for about a minute. Can someone please help? When I set up my new hard drive as a primary partition did this someone screw up my C: hard drive? Did it perhaps unmount it somehow? Any help would be fantastic. Thanks

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• XP Computer won't start (Missing/Corrupt 'System' file) - recently added new hard drive

  - by qwerty2

  Hi all, Pulling my hair out here. I recently replaced my D: 1TB drive (not a system drive) with a new 1.5TB drive. I loaded Windows XP, formatted the new drive and it was showing as working fine, alongside my C: windows system drive. I restart my machine and all of a sudden, Windows doesn't load and instead I get: "Windows could not start beause the following file is missing or corrupt" \WINDOWS\SYSTEM32\CONFIG\SYSTEM I don't have the original XP installation CD, although I do have another copy of XP, when I try and boot to it, I get the blue 'STOP' screen after it attempts to load the setup utlity for about a minute. Can someone please help? When I set up my new hard drive as a primary partition did this someone screw up my C: hard drive? Did it perhaps unmount it somehow? Any help would be fantastic. Thanks

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• Troubleshooting VC++ DLL in VB.Net

  - by Jolyon

  I'm trying to make a solution in Visual Studio that consists of a VC++ DLL and a VB.Net application. To figure this out, I created a VC++ Class Library project, with the following code (I removed all the junk the wizard creates): mathfuncs.cpp: #include "MathFuncs.h" namespace MathFuncs { double MyMathFuncs::Add(double a, double b) { return a + b; } } mathfuncs.h: using namespace System; namespace MathFuncs { public ref class MyMathFuncs { public: static double Add(double a, double b); }; } This compiles quite happily. I can then add a VC++ console project to the solution, add a reference to the original project for this new project, and call it as follows: test.cpp: using namespace System; int main(array<System::String ^> ^args) { double a = 7.4; int b = 99; Console::WriteLine("a + b = {0}", MathFuncs::MyMathFuncs::Add(a, b)); return 0; } This works just fine, and will build to test.exe and mathsfuncs.dll. However, I want to use a VB.Net project to call the DLL. To do this, I add a VB.Net project to the solution, make it the startup project, and add a reference to the original project. Then, I attempt to use it as follows: MsgBox(MathFuncs.MyMathFuncs.Add(1, 2)) However, when I run this code, it gives me an error: "Could not load file or assembly 'MathFuncsAssembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format." Do I need to expose the method somehow? I'm using Visual Studio 2008 Professional.

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• Developing a long pannable, sprite-animated Windows Store app

  - by Groo

  I am creating my first Windows Store app in XAML, and I cannot seem to find a proper example for the requirements I have (I have spent a couple of days fiddling around, so I apologize if I missed something obvious). Basic idea of the app is to have a large scrollable canvas which would lazily start animating visible parts of the view as soon as user stops panning over a certain content (with some audio played also): My original idea was to use a StackPanel to add a bunch of custom controls, each of which would then animate itself once visible (with a short delay), but I have a couple of concerns: If the entire canvas is ~50 screen widths wide, is it feasible to load all content at the beginning, or do I need to plan doing some lazy loading during scrolling? For example, when I select a certain region in the Bing Travel app, it seems to lazily load tiles as I scroll it towards the end. Since content is stretched 100% vertically, and these animations are vectorized to be resolution independent, I am not sure if XAML (CompositionTarget) will be able to handle this, or I have to go for DirectX (MonoGame or C++) to get rid of flicker. Even better, is there an example for Windows 8 which uses a 100% vertically sized GridView with custom animated controls inside?

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• How do you handle reboots?

  - by Mart

  We have one VPS (Windows 2008 R2+IIS7.5), with an asp.net mvc 3 application. The main question is: how to handle issues when Windows needs to reboot? (after installing Windows Updates or anything else). The goal is to make the website 24/7, but first it's ok to show a message to the users. (we'll be back soon, something like app_offline.htm) Our application uses SQL and also writes/reads some files (uploaded photos, documents) which are not stored in SQL. What do you recommend? Load balancing with ARR? (with 1+2 servers, but what if the front-end server needs reboot?) Windows failover cluster? SQL failover cluster? What to do with uploaded files? I really don't know what would be the best (and simplest) solution.

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• Printing problem in Silverlight 4.0 RC - loading images in code behind

  - by Jacek Ciereszko

  Few days ago I faced a problem with printing in new Silverlight 4 RC. When you try to dynamically load image (in code behind) and print it, it doesn't work. Paper sheet is blank. Problem XAML file: <Image x:Name="image" Stretch="None" /> XAML.cs: image.Source = new BitmapImage(new Uri(imageUri, UriKind.RelativeOrAbsolute));  Print: var pd = new PrintDocument();   pd.PrintPage += (s, args) =>     {       args.PageVisual = image;     };   pd.Print(); Result: Blank paper.   Solution What you need to do, is forced Silverlight engine to load that image before printing start. To accomplish that I proposed simply checking PixelWith value. Your code will ask about PixelWidth of image so it will have to be loaded. XAML.cs: BitmapImage bImage = new BitmapImage(new Uri(imageUri, UriKind.RelativeOrAbsolute)); image.Source = bImage; InitControl(imageUri, movieUri, isLeft); int w = bImage.PixelWidth; int h = bImage.PixelHeight;   DONE!   Jacek Ciereszko

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• How much traffic a linux-based shaper would be able to chew

  - by facha

  Hi, everyone I have a linux based traffic shaper (iptables + tc htb policy). It works in bridge mode. Shapes traffic based on IPs and ports (there are about 100 rules in the "mangle" chain of iptables). Right now its throughoutput is about 100 mb/s (I don't remember pps, there are about 800 users in the network). Just was wondering - when I will hit the limit. How much traffic could a linux-based shaper possibly get throuhg it. If you have one under heavy load, please could you write what machine you use and what load there is. Or if you have any other info about the subj, please write as well. Thanks in advance.

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• How to Best Optimize up Model Transforms, Import 3DS Animations Into XNA 4.0?

  - by Jason R. Mick

  Relative beginner to XNA, but trying to build a multi-purpose (3D) game frameworking in XNA 4. Been using the Reed (O'Reilly) and Cawood/McGee (McGraw Hill) guides. My question is multi-faceted and involves how to most efficiently handle models. I'm using 3DS Max 2010 with kw-Xport to ship out my models as .X files. Solved an early problem by using my depth stencil state. My models are now loading properly (yay!) and I have basic bounding working, I just want to optimize transforming models and get animations working as a next step. My questions on models are: 1. Do you have any suggestions for good resources on exporting 3DS animations to XNA? I've seen some resources on how to handle animations in XNA, but most skimp on basic topics of how to convert multi-animation 3DS files. For example how do I take one big long string of keyframed animations (say running, frame 5-20, climbing frames 25-45, etc.) and turned them into named XNA animations. To my understanding every XNA animation has to have a name, but I haven't seen any tutorials on creating a new named animation from a subset of frames. 2. Is it faster to load a model once and animate/transform that base model on the fly @ draw time, or to load multiple models? My game will have multiple enemies, and I've already seen some lagginess in XNA, so II want to make my code efficient... 3. I've heard people on app hub talking about making custom content processors for models-- what is the benefit of this? Does it speed up transforming or animating the models? If so, can you point me towards any good (model-centric) tutorials? (I've built a custom height map content processor to generate terrain, following Cawood's examples, I'm just a bit confused as to how a model content processor would be implemented.)

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• Stress test speed on a gateway?

  - by TheLQ

  I'm interested in stress testing my gateway server but am lost on how. Most of the stress testing applications I've seen only see how much load an app like Apache can handle, but not this. Essentially I want to send as many packets I can into this box with one computer on one card and see how many come out the other in another computer just to get an idea of what kind of load this can handle. I'm also interested how Snort will perform. I'm not really sure how to do this though. What tools could you recommend that could do this?

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• SQL Azure Service Issues &ndash; 10.27.2012 (Restored Now)

  - by ToStringTheory

  Please note that if you have a Windows Azure website, or use SQL Azure, your site may be experiencing downtime currently.  Notice I just called in regarding one of my public facing internet sites, because the site was failing to load anything but its error page, I couldn’t connect to the database to inspect application error logs, and the Windows Azure Management portal won’t load the SQL Azure extension. After speaking to the representative, he also mentioned that they were also having some problems updating the Service Dashboard which shows service up/down time, and for now, they are posting messages at http://account.windowsazure.com.  Please note that this issue may only be effecting certain regions.  Last, I may have misheard the representative, but he said that the outage was being categorized as a level 8, and if I heard correctly, I think he said that level 8 was the worst level.  I can’t say for sure on this though, because the phone connection to their support number was bad – large amounts of white noise. Good Luck! Update It appears that this outage may also be effecting the following services: SQL Database, Service Bus, Datamarket, Windows Azure Marketplace, Shared Caching, Access Control 2.0, and SQL Reporting. The note on the account page says for the South Central US region, however, I believe the representative I spoke to also mentioned North Central. As I said before though, the connection was bad. Update 2 My site regained connectivity about an hour ago, and it appears that the service dashboard is back in operation with correct status and history. It does appear that I misheard on the phone regarding multiple regions, so chances are this only effected a percentage of the platform. All in all, if this WAS their worst level of a problem, they really got it fixed and back up pretty fast. All in all, I understand that it is inherent for a complex system such as Azure to have ups and downs, but at the end of the day, I am still happy to support Azure to its fullest!

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