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• Exception Handling Differences Between 32/64 Bit

  - by Alois Kraus

  I do quite a bit of debugging .NET applications but from time to time I see things that are impossible (at a first look). I may ask you dear reader what your mental exception handling model is. Exception handling is easy after all right? Lets suppose the following code:         private void F1(object sender, EventArgs e)         {             try             {                 F2();             }             catch (Exception ex)             {                 throw new Exception("even worse Exception");             }           }           private void F2()         {             try             {                 F3();             }             finally             {                 throw new Exception("other exception");             }         }           private void F3()         {             throw new NotImplementedException();         }   What will the call stack look like when you break into the catch(Exception) clause in Windbg (32 and 64 bit on .NET 3.5 SP1)? The mental model I have is that when an exception is thrown the stack frames are unwound until the catch handler can execute. An exception does propagate the call chain upwards.   So when F3 does throw an exception the control flow will resume at the finally handler in F2 which does throw another exception hiding the original one (that is nasty) and then the new Exception will be catched in F1 where the catch handler is executed. So we should see in the catch handler in F1 as call stack only the F1 stack frame right? Well lets try it out in Windbg. For this I created a simple Windows Forms application with one button which does execute the F1 method in its click handler. When you compile the application for 64 bit and the catch handler is reached you will find with the following commands in Windbg   Load sos extension from the same path where mscorwks was loaded in the current process .loadby sos mscorwks   Beak on clr exceptions sxe clr   Continue execution g   Dump mixed call stack container C++  and .NET Stacks interleaved 0:000> !DumpStack OS Thread Id: 0x1d8 (0) Child-SP         RetAddr          Call Site 00000000002c88c0 000007fefa68f0bd KERNELBASE!RaiseException+0x39 00000000002c8990 000007fefac42ed0 mscorwks!RaiseTheExceptionInternalOnly+0x295 00000000002c8a60 000007ff005dd7f4 mscorwks!JIT_Throw+0x130 00000000002c8c10 000007fefa6942e1 WindowsFormsApplication1!WindowsFormsApplication1.Form1.F1(System.Object, System.EventArgs)+0xb4 00000000002c8c60 000007fefa661012 mscorwks!ExceptionTracker::CallHandler+0x145 00000000002c8d60 000007fefa711a72 mscorwks!ExceptionTracker::CallCatchHandler+0x9e 00000000002c8df0 0000000077b055cd mscorwks!ProcessCLRException+0x25e 00000000002c8e90 0000000077ae55f8 ntdll!RtlpExecuteHandlerForUnwind+0xd 00000000002c8ec0 000007fefa637c1a ntdll!RtlUnwindEx+0x539 00000000002c9560 000007fefa711a21 mscorwks!ClrUnwindEx+0x36 00000000002c9a70 0000000077b0554d mscorwks!ProcessCLRException+0x20d 00000000002c9b10 0000000077ae5d1c ntdll!RtlpExecuteHandlerForException+0xd 00000000002c9b40 0000000077b1fe48 ntdll!RtlDispatchException+0x3cb 00000000002ca220 000007fefdaeaa7d ntdll!KiUserExceptionDispatcher+0x2e 00000000002ca7e0 000007fefa68f0bd KERNELBASE!RaiseException+0x39 00000000002ca8b0 000007fefac42ed0 mscorwks!RaiseTheExceptionInternalOnly+0x295 00000000002ca980 000007ff005dd8df mscorwks!JIT_Throw+0x130 00000000002cab30 000007fefa6942e1 WindowsFormsApplication1!WindowsFormsApplication1.Form1.F2()+0x9f 00000000002cab80 000007fefa71b5b3 mscorwks!ExceptionTracker::CallHandler+0x145 00000000002cac80 000007fefa70dcd0 mscorwks!ExceptionTracker::ProcessManagedCallFrame+0x683 00000000002caed0 000007fefa7119af mscorwks!ExceptionTracker::ProcessOSExceptionNotification+0x430 00000000002cbd90 0000000077b055cd mscorwks!ProcessCLRException+0x19b 00000000002cbe30 0000000077ae55f8 ntdll!RtlpExecuteHandlerForUnwind+0xd 00000000002cbe60 000007fefa637c1a ntdll!RtlUnwindEx+0x539 00000000002cc500 000007fefa711a21 mscorwks!ClrUnwindEx+0x36 00000000002cca10 0000000077b0554d mscorwks!ProcessCLRException+0x20d 00000000002ccab0 0000000077ae5d1c ntdll!RtlpExecuteHandlerForException+0xd 00000000002ccae0 0000000077b1fe48 ntdll!RtlDispatchException+0x3cb 00000000002cd1c0 000007fefdaeaa7d ntdll!KiUserExceptionDispatcher+0x2e 00000000002cd780 000007fefa68f0bd KERNELBASE!RaiseException+0x39 00000000002cd850 000007fefac42ed0 mscorwks!RaiseTheExceptionInternalOnly+0x295 00000000002cd920 000007ff005dd968 mscorwks!JIT_Throw+0x130 00000000002cdad0 000007ff005dd875 WindowsFormsApplication1!WindowsFormsApplication1.Form1.F3()+0x48 00000000002cdb10 000007ff005dd786 WindowsFormsApplication1!WindowsFormsApplication1.Form1.F2()+0x35 00000000002cdb60 000007ff005dbe6a WindowsFormsApplication1!WindowsFormsApplication1.Form1.F1(System.Object, System.EventArgs)+0x46 00000000002cdbc0 000007ff005dd452 System_Windows_Forms!System.Windows.Forms.Control.OnClick(System.EventArgs)+0x5a   Hm okaaay. I see my method F1 two times in this call stack. Looks like we did get some recursion bug. But that can´t be given the obvious code above. Let´s try the same thing in a 32 bit process.  0:000> !DumpStack OS Thread Id: 0x33e4 (0) Current frame: KERNELBASE!RaiseException+0x58 ChildEBP RetAddr  Caller,Callee 0028ed38 767db727 KERNELBASE!RaiseException+0x58, calling ntdll!RtlRaiseException 0028ed4c 68b9008c mscorwks!Binder::RawGetClass+0x20, calling mscorwks!Module::LookupTypeDef 0028ed5c 68b904ff mscorwks!Binder::IsClass+0x23, calling mscorwks!Binder::RawGetClass 0028ed68 68bfb96f mscorwks!Binder::IsException+0x14, calling mscorwks!Binder::IsClass 0028ed78 68bfb996 mscorwks!IsExceptionOfType+0x23, calling mscorwks!Binder::IsException 0028ed80 68bfbb1c mscorwks!RaiseTheExceptionInternalOnly+0x2a8, calling KERNEL32!RaiseExceptionStub 0028eda8 68ba0713 mscorwks!Module::ResolveStringRef+0xe0, calling mscorwks!BaseDomain::GetStringObjRefPtrFromUnicodeString 0028edc8 68b91e8d mscorwks!SetObjectReferenceUnchecked+0x19 0028ede0 68c8e910 mscorwks!JIT_Throw+0xfc, calling mscorwks!RaiseTheExceptionInternalOnly 0028ee44 68c8e734 mscorwks!JIT_StrCns+0x22, calling mscorwks!LazyMachStateCaptureState 0028ee54 68c8e865 mscorwks!JIT_Throw+0x1e, calling mscorwks!LazyMachStateCaptureState 0028eea4 02ffaecd (MethodDesc 0x7af08c +0x7d WindowsFormsApplication1.Form1.F1(System.Object, System.EventArgs)), calling mscorwks!JIT_Throw 0028eeec 02ffaf19 (MethodDesc 0x7af098 +0x29 WindowsFormsApplication1.Form1.F2()), calling 06370634 0028ef58 02ffae37 (MethodDesc 0x7a7bb0 +0x4f System.Windows.Forms.Control.OnClick(System.EventArgs))   That does look more familar. The call stack has been unwound and we do see only some frames into the history where the debugger was smart enough to find out that we have called F2 from F1. The exception handling on 64 bit systems does work quite differently which seems to have the nice property to remember the called methods not only during the first pass of exception filter clauses (during first pass all catch handler are called if they are going to catch the exception which is about to be thrown)  but also when the actual stack unwind has taken place. This makes it possible to follow not only the call stack right at the moment but also to look into the “history” of the catch/finally clauses. In a 64 bit process you only need to look at the ExceptionTracker to find out if a catch or finally handler was called. The two frames ProcessManagedCallFrame/CallHandler does indicate a finally clause whereas CallCatchHandler/CallHandler indicates a catch clause. That was a interesting one. Oh and by the way if you manage to load the Microsoft symbols you can also find out the hidden exception which. When you encounter in the call stack a line 0016eb34 75b79617 KERNELBASE!RaiseException+0x58 ====> Exception Code e0434f4d cxr@16e850 exr@16e838 Then it is a good idea to execute .exr 16e838 !analyze –v to find out more. In the managed world it is even easier since we can dump the objects allocated on the stack which have not yet been garbage collected to look at former method parameters. The command !dso which is the abbreviation for dump stack objects will give you 0:000> !dso OS Thread Id: 0x46c (0) ESP/REG  Object   Name 0016dd4c 020737f0 System.Exception 0016dd98 020737f0 System.Exception 0016dda8 01f5c6cc System.Windows.Forms.Button 0016ddac 01f5d2b8 System.EventHandler 0016ddb0 02071744 System.Windows.Forms.MouseEventArgs 0016ddc0 01f5d2b8 System.EventHandler 0016ddcc 01f5c6cc System.Windows.Forms.Button 0016dddc 020737f0 System.Exception 0016dde4 01f5d2b8 System.EventHandler 0016ddec 02071744 System.Windows.Forms.MouseEventArgs 0016de40 020737f0 System.Exception 0016de80 02071744 System.Windows.Forms.MouseEventArgs 0016de8c 01f5d2b8 System.EventHandler 0016de90 01f5c6cc System.Windows.Forms.Button 0016df10 02073784 System.SByte[] 0016df5c 02073684 System.NotImplementedException 0016e2a0 02073684 System.NotImplementedException 0016e2e8 01ed69f4 System.Resources.ResourceManager From there it is easy to do 0:000> !pe 02073684 Exception object: 02073684 Exception type: System.NotImplementedException Message: Die Methode oder der Vorgang sind nicht implementiert. InnerException: <none> StackTrace (generated):     SP       IP       Function     0016ECB0 006904AD WindowsFormsApplication2!WindowsFormsApplication2.Form1.F3()+0x35     0016ECC0 00690411 WindowsFormsApplication2!WindowsFormsApplication2.Form1.F2()+0x29     0016ECF0 0069038F WindowsFormsApplication2!WindowsFormsApplication2.Form1.F1(System.Object, System.EventArgs)+0x3f StackTraceString: <none> HResult: 80004001 to see the former exception. That´s all for today.

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• Utilizing Generics to make a Class structure more mutable…

  - by Keith Barrows

  While the ASP.NET GridView control supports automatic paging I found it faster to use custom paging in several situations.  I found myself rewriting the same code over and over just to add the basic sorting capabilities to an ASP.NET GridView object.  So today I took just a little bit of time to encapsulate it all into a Class I can use and reuse on any page with a GridView.  In fact, it will probably take longer to write this blog entry than it took to encapsulate the functionality...(read more)

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• Is ASP.NET MVC completely (and exclusively) based on conventions?

  - by Mike Valeriano

  --TL;DR Is there a "Hello World!" ASP.NET MVC tutorial out there that doesn't rely on conventions and "stock" projects? Is it even possible to take advantage of the technology without reusing the default file structure, and start from a single "hello_world.asp" file or something (like in PHP)? Am I completely mistaken and I should be looking somewhere else, maybe this? I'm interested in the MVC framework, not Web Forms --Background I've played a bit with PHP in the past, just for fun, and now I'm back to it since web development became relevant for me once again. I'm no professional, but I try to gain as much knowledge and control over the technology I'm working with as possible. I'm using Visual Studio 2012 for C# - my "desktop" language of choice - and since I got the Professional Edition from Dreamspark, the Web Development Tools are available, including ASP.NET MVC 4. I won't touch Web Forms, but the MVC Framework got my attention because the MVC pattern is something I can really relate to, since it provides the control I want but... not quite. Learning PHP was easy - and right form the start I could just create a "hello_world.php" file and just do something like this for immediate results: <!-- file: hello_world.php --> <?php> echo "Hello World!"; <?> But I couldn't find a single ASP.NET (MVC) tutorial out there (I'll be sure to buy one of the upcoming MVC 4 books, only a month away or so) that would start like that. They all start with a sample project, building up knowledge from the basics and heavily using conventions as they go along. Which is fine, I suppose, but it's now the best way for me to learn things. Even the "Empty" project template for a new ASP.NET MVC 4 Application in VS2012 is not empty at all: several files and folders are created for you - much like a new C# desktop application project, but with C# I can in fact start from scratch, creating the project structure myself. It is not the case with PHP: I can choose from a plethora of different MVC frameworks I can just create my own framework I can just skip frameworks altogether, and toss random PHP along with my HTML on a single file and make it work I understand the framework needs to establish some rules, but what if I just want to create a single page website with some C# logic behind it? Do I really need to create a whole bloat of files and folders for the sake of convention? Also, please understand that I haven't gotten far on any of those tutorials mainly because of this reason, but, if that's the only way to do it, I'll go for it using one of the books I've mentioned before. This is my first contact with ASP.NET but from the few comparisons I've read, I believe I should stay the hell away from Web Forms. Thank you. (Please forgive the broken English - it is not my primary language.)

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• Downgrade a bunch of packages

  - by Manuel

  Maybe you have installed packages from a PPA or an external source (e.g. downloaded a .deb for a package that is available through the Ubuntu repos.). Then you decide to drop these upgraded versions in favour to the official repositories.First step is to remove the entries of the sources.list. Is there a way to downgrade all to the highest available version? I know you can install specific versions with apt-get install [package]=[version] But can you downgrade all?

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• .NET Reflector Pro to the rescue

  Almost all applications have to interface with components or modules written by somebody else, for which you don't have the source code. This is fine until things go wrong, but when you need to refactor your code and you keep getting strange exceptions, you'll start to wish you could place breakpoints in someone else's code and step through it. Now, of course, you can, as Geoffrey Braaf discovered.

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• New binary analysis tool finds FOSS in device firmware

  <b>ars Technica:</b> "Software development company Loohuis Consulting and process management consultancy OpenDawn have released a new binary analysis tool that is designed to detect Linux and BusyBox in binary firmware. The program, which is freely available for download, is intended to aid open source license compliance efforts."

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• Is it possible to extract textures or sprites from compiled game files?

  - by Brian Reindel

  For instance, every map in Portal has what appear to be sprites over a texture indicating the obstacles you'll face (see screenshot). Are these resources compiled into the source as byte code, or is it possible to extract them from installation files? Obviously I understand copyright implications, and I am only interested in using it for a recreational project. Instead of recreating them, I wonder if they can be extracted.

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• How to install monitorx?

  - by blade19899

  I followed a tutorial at unixmen on how to install monitorx in ubuntu i installed the dependencies and downloaded the monitorix_2.5.0-izzy1_all.deb deb package but when i try to install it i get this error google transtaler (i have a dutch Ubuntu and so was the error message) dpkg: error processing monitorix_2.5.0-izzy1_all.deb (- install): parsing file '/ var / lib / dpkg / tmp.ci / control' near line 14 package 'monitorix': blank line in the value of field 'Description' Errors were encountered while processing: monitorix_2.5.0-izzy1_all.deb my question is how to get monitorx up and running in Ubuntu 11.10 amd64

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• NUMA-aware placement of communication variables

  - by Dave

  For classic NUMA-aware programming I'm typically most concerned about simple cold, capacity and compulsory misses and whether we can satisfy the miss by locally connected memory or whether we have to pull the line from its home node over the coherent interconnect -- we'd like to minimize channel contention and conserve interconnect bandwidth. That is, for this style of programming we're quite aware of where memory is homed relative to the threads that will be accessing it. Ideally, a page is collocated on the node with the thread that's expected to most frequently access the page, as simple misses on the page can be satisfied without resorting to transferring the line over the interconnect. The default "first touch" NUMA page placement policy tends to work reasonable well in this regard. When a virtual page is first accessed, the operating system will attempt to provision and map that virtual page to a physical page allocated from the node where the accessing thread is running. It's worth noting that the node-level memory interleaving granularity is usually a multiple of the page size, so we can say that a given page P resides on some node N. That is, the memory underlying a page resides on just one node. But when thinking about accesses to heavily-written communication variables we normally consider what caches the lines underlying such variables might be resident in, and in what states. We want to minimize coherence misses and cache probe activity and interconnect traffic in general. I don't usually give much thought to the location of the home NUMA node underlying such highly shared variables. On a SPARC T5440, for instance, which consists of 4 T2+ processors connected by a central coherence hub, the home node and placement of heavily accessed communication variables has very little impact on performance. The variables are frequently accessed so likely in M-state in some cache, and the location of the home node is of little consequence because a requester can use cache-to-cache transfers to get the line. Or at least that's what I thought. Recently, though, I was exploring a simple shared memory point-to-point communication model where a client writes a request into a request mailbox and then busy-waits on a response variable. It's a simple example of delegation based on message passing. The server polls the request mailbox, and having fetched a new request value, performs some operation and then writes a reply value into the response variable. As noted above, on a T5440 performance is insensitive to the placement of the communication variables -- the request and response mailbox words. But on a Sun/Oracle X4800 I noticed that was not the case and that NUMA placement of the communication variables was actually quite important. For background an X4800 system consists of 8 Intel X7560 Xeons . Each package (socket) has 8 cores with 2 contexts per core, so the system is 8x8x2. Each package is also a NUMA node and has locally attached memory. Every package has 3 point-to-point QPI links for cache coherence, and the system is configured with a twisted ladder "mobius" topology. The cache coherence fabric is glueless -- there's not central arbiter or coherence hub. The maximum distance between any two nodes is just 2 hops over the QPI links. For any given node, 3 other nodes are 1 hop distant and the remaining 4 nodes are 2 hops distant. Using a single request (client) thread and a single response (server) thread, a benchmark harness explored all permutations of NUMA placement for the two threads and the two communication variables, measuring the average round-trip-time and throughput rate between the client and server. In this benchmark the server simply acts as a simple transponder, writing the request value plus 1 back into the reply field, so there's no particular computation phase and we're only measuring communication overheads. In addition to varying the placement of communication variables over pairs of nodes, we also explored variations where both variables were placed on one page (and thus on one node) -- either on the same cache line or different cache lines -- while varying the node where the variables reside along with the placement of the threads. The key observation was that if the client and server threads were on different nodes, then the best placement of variables was to have the request variable (written by the client and read by the server) reside on the same node as the client thread, and to place the response variable (written by the server and read by the client) on the same node as the server. That is, if you have a variable that's to be written by one thread and read by another, it should be homed with the writer thread. For our simple client-server model that means using split request and response communication variables with unidirectional message flow on a given page. This can yield up to twice the throughput of less favorable placement strategies. Our X4800 uses the QPI 1.0 protocol with source-based snooping. Briefly, when node A needs to probe a cache line it fires off snoop requests to all the nodes in the system. Those recipients then forward their response not to the original requester, but to the home node H of the cache line. H waits for and collects the responses, adjudicates and resolves conflicts and ensures memory-model ordering, and then sends a definitive reply back to the original requester A. If some node B needed to transfer the line to A, it will do so by cache-to-cache transfer and let H know about the disposition of the cache line. A needs to wait for the authoritative response from H. So if a thread on node A wants to write a value to be read by a thread on node B, the latency is dependent on the distances between A, B, and H. We observe the best performance when the written-to variable is co-homed with the writer A. That is, we want H and A to be the same node, as the writer doesn't need the home to respond over the QPI link, as the writer and the home reside on the very same node. With architecturally informed placement of communication variables we eliminate at least one QPI hop from the critical path. Newer Intel processors use the QPI 1.1 coherence protocol with home-based snooping. As noted above, under source-snooping a requester broadcasts snoop requests to all nodes. Those nodes send their response to the home node of the location, which provides memory ordering, reconciles conflicts, etc., and then posts a definitive reply to the requester. In home-based snooping the snoop probe goes directly to the home node and are not broadcast. The home node can consult snoop filters -- if present -- and send out requests to retrieve the line if necessary. The 3rd party owner of the line, if any, can respond either to the home or the original requester (or even to both) according to the protocol policies. There are myriad variations that have been implemented, and unfortunately vendor terminology doesn't always agree between vendors or with the academic taxonomy papers. The key is that home-snooping enables the use of a snoop filter to reduce interconnect traffic. And while home-snooping might have a longer critical path (latency) than source-based snooping, it also may require fewer messages and less overall bandwidth. It'll be interesting to reprise these experiments on a platform with home-based snooping. While collecting data I also noticed that there are placement concerns even in the seemingly trivial case when both threads and both variables reside on a single node. Internally, the cores on each X7560 package are connected by an internal ring. (Actually there are multiple contra-rotating rings). And the last-level on-chip cache (LLC) is partitioned in banks or slices, which with each slice being associated with a core on the ring topology. A hardware hash function associates each physical address with a specific home bank. Thus we face distance and topology concerns even for intra-package communications, although the latencies are not nearly the magnitude we see inter-package. I've not seen such communication distance artifacts on the T2+, where the cache banks are connected to the cores via a high-speed crossbar instead of a ring -- communication latencies seem more regular.

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• Best practices for logging and tracing in .NET

  - by Levidad

  I've been reading a lot about tracing and logging, trying to find some golden rule for best practices in the matter, but there isn't any. People say that good programmers produce good tracing, but put it that way and it has to come from experience. I've also read similar questions in here and through the internet and they are not really the same thing I am asking or do not have a satisfying answer, maybe because the questions lack some detail. So, folks say that tracing should sort of replicate the experience of debugging the application in cases where you can't attach a debugger. It should provide enough context so that you can see which path is taken at each control point in the application. Going deeper, you can even distinguish between tracing and event logging, in that "event logging is different from tracing in that it captures major states rather than detailed flow of control". Now, say I want to do my tracing and logging using only the standard .NET classes, those in the System.Diagnostics namespace. I figured that the TraceSource class is better for the job than the static Trace class, because I want to differentiate among the trace levels and using the TraceSource class I can pass in a parameter informing the event type, while using the Trace class I must use Trace.WriteLineIf and then verify things like SourceSwitch.TraceInformation and SourceSwitch.TraceErrors, and it doesn't even have properties like TraceVerbose or TraceStart. With all that in mind, would you consider a good practice to do as follows: Trace a "Start" event when begining a method, which should represent a single logical operation or a pipeline, along with a string representation of the parameter values passed in to the method. Trace an "Information" event when inserting an item into the database. Trace an "Information" event when taking one path or another in an important if/else statement. Trace a "Critical" or "Error" in a catch block depending on weather this is a recoverable error. Trace a "Stop" event when finishing the execution of the method. And also, please clarify when best to trace Verbose and Warning event types. If you have examples of code with nice trace/logging and are willing to share, that would be excelent. Note: I've found some good information here, but still not what I am looking for: http://msdn.microsoft.com/en-us/magazine/ff714589.aspx Thanks in advance!

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• Silverlight Cream for March 07, 2011 -- #1055

  - by Dave Campbell

  In this Issue: Max Paulousky, Chris Rouw, David Anson, Jesse Liberty, Shawn Wildermuth, Simon Guindon, and Dhananjay Kumar. Above the Fold: Silverlight: "Faster Databinding in WPF and Silverlight using OptimizedObservableCollection" Simon Guindon WP7: "Phoney Tools Updated (WP7 Open Source Library)" Shawn Wildermuth From SilverlightCream.com: Problems With Sharing Windows Phone 7 Applications Within A Large Group Of Beta Testers Max Paulousky has a post up discussing the issues surrounding beta testing a WP7 app with a large group of testers... and how to pull it all off. WP7 Insights #1: Consuming REST APIs within a WP7 app Chris Rouw is beginning a WP7 series based on his recent experience of getting a client's app into the marketplace. This first in his series is on consuming REST APIs ... lots of good code and explanations. Improving Windows Phone 7 application performance is even easier with these LowProfileImageLoader and DeferredLoadListBox updates David Anson has an update to his LowProfileImageLoader and DeferredLoadListBox after issues brought up by readers... so we all win with the great feedback from alert devs. When Isolated Storage Isn’t Enough Jesse Liberty started looking at Jeremy Likness' Sterling with this post in the WP7 From Scratch series. He starts with downloading it from CodePlex ... great way to get into Sterling if you haven't already. Phoney Tools Updated (WP7 Open Source Library) Shawn Wildermuth has the latest drop of his Phoney Tools up... this is the last Alpha. I've added a tag for it as well. He's fixed some things, added others... check out the post and go grab the code. Faster Databinding in WPF and Silverlight using OptimizedObservableCollection Simon Guindon is a blogger I've not been following, but this post on an OptimizedObservableCollection caught my eye. He added an AddRange() to the ObservableCollection to get a speed enhancement when adding items... and a pretty good speed enhancement it is. Reading files asynchronously using WebClient class in Silverlight Dhananjay Kumar is another prolific blogger that I've not been following, so we'll start with his latest... a step-by-step guide to reading an XML file asynchronously. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• With a typical USB hard drive enclosure, is the full range of drive power management functionality available?

  - by intuited

  In what may be an unrelated matter: is it possible to suspend a PC without unmounting an attached USB-powered drive, and then remounting it on resume? This is the behaviour I'm currently seeing (running Ubuntu linux 10.10). Are there certain models or brands that provide more complete control over this aspect of drive operation? My Friendly Neighbourhood Computer Store carries (part of) the Vantec Nexstar product line.

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• How to make ad-hoc network connection?

  - by Johan Nathaniel Soedjono

  I can't make ad-hoc from my netbook (Ubuntu 12.04). It has internet source from ethernet. I have tried making from network manager. But it always says 'Wireless Network Disconnected' and can't be detected by neither my other laptop nor my cell phone which have wifi. How can I make adhoc from it? I have already tried making a connection in Network Manager a lot of times, but it still can't connect and appear notification 'Wireless Network Disconnected'.

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• links for 2011-02-18

  - by Bob Rhubart

  VirtualBox: Pre-Built Developer VMs "Learning your way around a new software stack is challenging enough without having to spend multiple cycles on the install process. Instead, we have packaged such stacks into pre-built Oracle VM VirtualBox appliances that you can download, install, and experience as a single unit." (tags: oracle virtualization virtualbox) Java Space on Parleys (The Java Source) "'Oracle partnered with Stephan Janssen, founder of Parleys to make this happen. Parleys website offers a user friendly experience to view online content. You can download some of the talks to your desktop or watch them on the go on mobile devices." (tags: oracle java parleys) Why ADF Developers Should Attend ODTUG This Year (Shay Shmeltzer's Weblog) Shay says: "A new track called the "Fusion Middleware" track has been formed and it has lots of sessions for any level of ADF developer. The track is run by several Oracle ACEs who are also involved in the ADF Enterprise Methodology Group." (tags: oracle otn odtug fusionmiddleware) Wrapping up an Exciting Mobile World Congress (The Java Source) "One of the more popular topics in our booth was the use of Java in the Smart Grid. In our booth we were showing off some of the work of the Hydra Consortium whose goal it is to leverage the emerging smart grid infrastructure to securely enable the delivery of personal health data..." (tags: oracle java smartgrid) How to Audit and Monitor BI Publisher Reports Access? (Oracle BI Publisher Blog) "Do you know who is accessing to which report at what time at your reporting environment ? As you delivered the BI Publisher reports to the production environment and your users start using them as part of their daily business operations you might wonder such questions." (tags: oracle otn businessintelligence) Oracle VM VirtualBox 4.0.4 Released! (Oracle's Virtualization Blog) Fat Bloke says: "Oracle made a maintenance update release of Oracle VM VirtualBox version 4.0.4 today. You can Download it now, or read about the changes in the ChangeLog." (tags: oracle otn virtualization virtualbox) Obama says Cloud and Data Center Consolidation Will Help Curb IT Costs | WHIR Web Hosting Industry News "In the report, he estimated that the federal government could reallocate some $20 billion of IT spending to cloud computing technologies and reduce 'data center infrastructure expenditure by approximately 30 percent' through cloud computing." (tags: cloud obama datacenter) Chris Muir: ADF BC: Creating an "EXISTS" View Criteria Oracle ACE Director Chris Muir shares some ADF tips. (tags: oracle otn oracleace adf) Translation and Multiple Languages with Oracle UCM | Bex Huff Bex says: "Last year, I gave a presentation at Oracle Open World about Creating and Maintaining an Internationalized Web Site. Well, I'm happy to announce that one of the several add-ons to UCM is now available for purchase!" (tags: oracle otn enterprise2.0 ecm oracleace) ORACLENERD: Design Documentation Oracle ACE Chet "ORACLENERD" Justice makes a pledge. (tags: oracle otn oracleace database)

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• Which language and platform features really boosted your coding speed?

  - by Serge

  The question is about delivering working code faster without any regard for design, quality, maintainability, etc. Here is the list of things that help me to write and read code faster: Language: static typing, support for object-oriented and functional programming styles, embedded documentation, short compile-debug-fix cycle or REPL, automatic memory management Platform: "batteries" included (text, regex, IO, threading, networking), thriving community, tons of open-source libs Tools: IDE, visual debugger, code-completion, code navigation, refactoring

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• Warp GameObject Size When Entering/Leaving Area

  - by Julian

  Below I have an image describing the desired functionality I am going for. Let's say you control a square and when you move this square into a given area, any part of your rigidbody/model inside of the area will be magnified upon entering and shrunk upon leaving. So now you more or less are made up of two rectangles, one small and one large. What would be an elegant approach towards achieving this effect?

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• Library missing for executable file

  - by user1610406

  There's an executable I downloaded onto my Ubuntu 10.04 and I can't run because it's missing a library. I have also tried compiling the source with CMake. This is my Terminal output: zack@zack-laptop:~/Desktop$ ./MultiMC ./MultiMC: error while loading shared libraries: libssl.so.1.0.0: cannot open shared object file: No such file or directory I think I need libssl 1.0 to run this file, but I'm not sure. Any help?

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• ArchBeat Top 10 for November 18-24, 2012

  - by Bob Rhubart

  The Top 10 most popular items shared on the OTN ArchBeat Facebook page for the week of November 18-24, 2012. One-Stop Shop for over 200 On-Demand Oracle Webcasts Webcasts can be a great way to get information about Oracle products without having to go cross-eyed reading yet another document off your computer screen. Oracle's new Webcast Center offers selectable filtering to make it easy to get to the information you want. Yes, you have to register to gain access, but that process is quick, and with over 200 webcasts to choose from you know you'll find useful content. Oracle SOA Suite 11g PS 5 introduces BPEL with conditional correlation for aggregation scenarios | Lucas Jellema An extensive, detailed technical post from Oracle ACE Director Lucas Jellema. Oracle Utilities Application Framework V4.2.0.0.0 Released | Anthony Shorten Principal Product Manager Anthony Shorten shares an overview of the changes implemented in the new release. Fault Handling and Prevention - Part 1 | Guido Schmutz and Ronald van Luttikhuizen In this technical article, part one of a four part series, Oracle ACE Directors Guido Schmutz and Ronald van Luttikhuizen guide you through an introduction to fault handling in a service-oriented environment using Oracle SOA Suite and Oracle Service Bus. Oracle BPM Process Accelerators and process excellence | Andrew Richards "Process Accelerators are ready-to-deploy solutions based on best practices to simplify process management requirements," says Capgemini's Andrew Richards. "They are considered to be 'product grade,' meaning they have been designed; engineered, documented and tested by Oracle themselves to a level that they can be deployed as-is for a solution to a problem or extended as appropriate for a particular scenario." Videos: Getting Started with Java Embedded | The Java Source Interested in Java Embedded? You'll want to check out these videos provided Tori Weildt, including interviews with Oracle's James Allen and Kevin Smith, recorded at ARM TechCon. JPA SQL and Fetching tuning ( EclipseLink ) | Edwin Biemond Oracle ACE Edwin Biemond's post illustrates how to "use the department and employee entity of the HR Oracle demo schema to explain the JPA options you have to control the SQL statements and the JPA relation Fetching." Devoxx 2012 Trip Report - clouds and sunshine | Markus Eisele Oracle ACE Director Markus Eisele shares an extensive and entertaining account of his experience at Devoxx 2012. Towards Ultra-Reusability for ADF - Adaptive Bindings | Duncan Mills "The task flow mechanism embodies one of the key value propositions of the ADF Framework," says Duncan Mills. "However, what if we could do more? How could we make task flows even more re-usable than they are today?" As you might expect, Duncan has answers for those questions. Java Specification Requests in Numbers | Markus Eisele Oracle ACE Director Markus Eisele shares some interesting data culled from the Java Community Process site. Thought for the Day "You can't have great software without a great team, and most software teams behave like dysfunctional families." — Jim McCarthy Source: SoftwareQuotes.com

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• British Telecom Automates Cloud Management with Oracle Enterprise Manager

  - by Anand Akela

  British Telecom delivers scalable and reliable Cloud services using Oracle Enterprise Manager’s automated management capabilities. Don't miss the on Oracle Launch Webcast : Total Cloud Control for Systems on April 12th at 9 AM PST . For more information, please go to Oracle Enterprise Manager  web page or  follow us at :  Twitter | Facebook | YouTube | Linkedin | Newsletter

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• unable to save files from Code Blocks ONLY

  - by ths

  i have an NTFS drive mounted in a folder /Tejas i have created a new project using it in a folder in this drive but i am unable to save the changes, i get the following error message Couldn't save project /Tejas/Project/codeblock/ciphers/ciphers.cbp (Maybe the file is write-protected?) i get similar message even when i try to save the c source file i am able to edit and save files using gedit editor... why am i getting this problem?

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• Microsoft MVP Award

  - by EltonStoneman

  [Source: http://geekswithblogs.net/EltonStoneman] I learned over Easter that I have been awarded a BizTalk MVP by Microsoft for 2010, which is great news. It's all a bit shadowy, but I suspect Michael Stephenson had a hand in it – so thanks Mike.

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• Asp.net Menu

  Hi,Just to help others. Link http://blog.ysatech.com/post/2009/12/14/ASP-NET-Horizontal-Menu-Control.aspx guides working of asp.net menus(Horizantal,vertical).You can also download the code.Thanks for keeping this code. Its helped me alot....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Script For Detecting Availability of XMLHttp in Internet Explorer

  - by Duncan Mills

  Having the XMLHttpRequest API available is key to any ADF Faces Rich Client application. Unfortunately, it is possible for users to switch off this option in Internet Explorer as a Security setting. Without XMLHttpRequest available, your ADF Faces application will simply not work correctly, but rather than giving the user a bad user experience wouldn't it be nicer to tell them that they need to make some changes in order to use the application?  Thanks to Blake Sullivan in the ADF Faces team we now have a little script that can do just this. The script is available from https://samplecode.oracle.com here - The attached file browserCheck.js is what you'll need to add to your project.The best way to use this script is to make changes to whatever template you are using for the entry points to your application. If you're not currently using template then you'll have to make the same change in each of your JSPX pages. Save the browserCheck.js file into a /js/ directory under your HTML root within your UI project (e.g. ViewController)In the template or page, select the <af:document> object in the Structure window. From the right mouse (context) menu choose Facet and select the metaContainer facet.Switch to the source code view and locate the metaContainer facet. Then insert the following lines (I've included the facet tag for clarity but you'll already have that):      <f:facet name="metaContainer">        <af:resource type="javascript"                      source="/js/browserCheck.js"/>        <af:resource type="javascript">           xmlhttpNativeCheck(                     "help/howToConfigureYourBrowser.html");        </af:resource>      </f:facet>Note that the argument to the xmlhttpNativeCheck function is a page that you want to show to the user if they need to change their browser configuration. So build this page in the appropriate place as well. You can also just call the function without any arguments e.g. xmlhttpNativeCheck(); in which case it will pop up default instructions for the user to follow, but not redirect to any other page.

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• "Shared Folders" Feature Is Not Working In VirtualBox

  - by Islam Hassan

  I have Ubuntu 11.10 as a host and another linux 2.6 distribution as a guest. When I try to setup guest additions, this error message appears Building the shared folder support module .. fail And because of that, when I run the following in terminal mount -t vboxsf shared /root/shared I get the following error message mount: unknown filesystem type 'vboxsf' Any syggestions please? EDIT Sorry, the mentioned error message isn't complete, this is it. Building the shared folder support module ...fail! (Look at /var/log/vboxadd-install.log to find out what went wrong) This is the content of vboxadd-install.log Uninstalling modules from DKMS Attempting to install using DKMS Creating symlink /var/lib/dkms/vboxguest/4.1.2/source -> /usr/src/vboxguest-4.1.2 DKMS: add Completed. Kernel preparation unnecessary for this kernel. Skipping... Building module: cleaning build area.... make KERNELRELEASE=3.2.6 -C /lib/modules/3.2.6/build M=/var/lib/dkms/vboxguest/4.1.2/build..........................(bad exit status: 2) Error! Bad return status for module build on kernel: 3.2.6 (i686) Consult the make.log in the build directory /var/lib/dkms/vboxguest/4.1.2/build/ for more information. 0 0 ERROR: binary package for vboxguest: 4.1.2 not found Failed to install using DKMS, attempting to install without make KBUILD_VERBOSE=1 -C /lib/modules/3.2.6/build SUBDIRS=/tmp/vbox.0 SRCROOT=/tmp/vbox.0 modules test -e include/generated/autoconf.h -a -e include/config/auto.conf || ( \ echo; \ echo " ERROR: Kernel configuration is invalid."; \ echo " include/generated/autoconf.h or include/config/auto.conf are missing.";\ echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ echo; \ /bin/false) mkdir -p /tmp/vbox.0/.tmp_versions ; rm -f /tmp/vbox.0/.tmp_versions/* WARNING: Symbol version dump /usr/src/linux-source-3.2.6/Module.symvers is missing; modules will have no dependencies and modversions. Actually the log file is very large and it exceeds the 30000 characters limit. How can I upload the entire log file here?

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• What more a Business Service can do?

  - by Rajesh Sharma

  Business services can be accessed from outside the application via XAI inbound service, or from within the application via scripting, Java, or info zones. Below is an example to what you can do with a business service wrapping an info zone.   Generally, a business service is specific to a page service program which references a maintenance object, that means one business service = one service program = one maintenance object. There have been quite a few threads in the forum around this topic where the business service is misconstrued to perform services only on a single object, for e.g. only for CILCSVAP - SA Page Maintenance, CILCPRMP - Premise Page Maintenance, CILCACCP - Account Page Maintenance, etc.   So what do you do when you want to retrieve some "non-persistent" field or information associated with some object/entity? Consider few business requirements: ·         Retrieve all the field activities associated to an account. ·         Retrieve the last bill date for an account. ·         Retrieve next bill date for an account.   It can be as simple as described below, for this post, we'll use the first scenario - Retrieve all the field activities associated to an account. To achieve this we'll have to do the following:   Step 1: Define an info zone   (A basic Zone of type F1-DE-SINGLE - Info Data Explorer - Single SQL has been used; you can use F1-DE - Info Data Explorer - Multiple SQLs for more complex scenarios)   Parameter Description Value To Enter User Filter 1 F1 Initial Display Columns C1 C2 C3 SQL Condition F1 SQL Statement SELECT     FA_ID, FA_STATUS_FLG, CRE_DTTM FROM     CI_FA WHERE     SP_ID IN         (SELECT SP_ID         FROM CI_SA_SP         WHERE             SA_ID IN                 (SELECT SA_ID                  FROM CI_SA                  WHERE                     ACCT_ID = :F1)) Column 1 source=SQLCOL sqlcol=FA_ID Column 2 source=SQLCOL sqlcol=FA_STATUS_FLG Column 3 type=TIME source=SQLCOL sqlcol=CRE_DTTM order=DESC   Note: Zone code specified was 'CM_ACCTFA'   Step 2: Define a business service Create a business service linked to 'Service Name' FWLZDEXP - Data Explorer. Schema will look like this:   <schema> <zoneCd mapField="ZONE_CD" default="CM_ACCTFA"/>      <accountId mapField="F1_VALUE"/>      <rowCount mapField="ROW_CNT"/>      <result type="group">         <selectList type="list" mapList="DE">             <faId mapField="COL_VALUE">                 <row mapList="DE_VAL">                     <SEQNO is="1"/>                 </row>             </faId>              <status mapField="COL_VALUE">                 <row mapList="DE_VAL">                     <SEQNO is="2"/>                 </row>             </status>              <createdDateTime mapField="COL_VALUE">                 <row mapList="DE_VAL">                     <SEQNO is="3"/>                 </row>             </createdDateTime>         </selectList>     </result> </schema>      What's next? As mentioned above, you can invoke this business service from an outside application via XAI inbound service or call this business service from within a script.   Step 3: Create a XAI inbound service for above created business service         Step 4: Test the inbound service   Go to XAI Submission and test the newly created service   <RXS_AccountFA>       <accountId>5922116763</accountId> </RXS_AccountFA>  

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