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• .NET Framework - Possible memory-leaky classes?

  - by Robert Fraser

  Just the other day I was investigating a memory leak that was ballooning the app from ~50MB to ~130MB in under two minutes. Turns out that the problem was with the ConcurrentQueue class. Internally, the class stores a linked list of arrays. When an item is dequeued from the ConcurrentQueue, the index in the array is bumped, but the item remains in the array (i.e. it's not set to null). The entire array node is dropped after enough enqueues/dequeues, so it's not technically a leak, but if storing only a few large objects in the ConcurrentQueue, this can get out of hand fast. The documentation makes no note of this danger. I was wondering what other potential memory pitfalls are in the Base Class Library? I know about the Substring one (that is, if you call substring and just hold onto the result, the whole string will still be in memory). Any others you've encountered?

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• Google App Engine - What causes cold start latency time to be high, even though my CPU usage is rela

  - by Spines

  I've optimized my code to use only lightweight libraries. I'm even using the low level datastore rather than JDO. And my cold start CPU usage has dropped from about 5 seconds to about 1.5 seconds. However, the time it takes to respond is often about 4.5 seconds, though it varies a lot. Here are some lines from my logs: 03-19 09:16PM 57.368 /donothing 200 4506ms 1516cpu_ms 0kb Mozilla/5.0 03-19 09:22PM 54.884 /donothing 200 4452ms 1477cpu_ms 0kb Mozilla/5.0 What is the app engine doing for those extra 3 seconds that apparently isn't using any CPU?

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• What can I do about a SQL Server ghost FK constraint?

  - by rcook8601

  I'm having some trouble with a SQL Server 2005 database that seems like it's keeping a ghost constraint around. I've got a script that drops the constraint in question, does some work, and then re-adds the same constraint. Normally, it works fine. Now, however, it can't re-add the constraint because the database says that it already exists, even though the drop worked fine! Here are the queries I'm working with: alter table individual drop constraint INDIVIDUAL_EMP_FK ALTER TABLE INDIVIDUAL ADD CONSTRAINT INDIVIDUAL_EMP_FK FOREIGN KEY (EMPLOYEE_ID) REFERENCES EMPLOYEE After the constraint is dropped, I've made sure that the object really is gone by using the following queries: select object_id('INDIVIDUAL_EMP_FK') select * from sys.foreign_keys where name like 'individual%' Both return no results (or null), but when I try to add the query again, I get: The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "INDIVIDUAL_EMP_FK". Trying to drop it gets me a message that it doesn't exist. Any ideas?

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• Eclipse: How to add an existing source folder?

  - by evilfred

  ARGH Eclipse is SO frustrating I have a directory called c:\RemoteSrc . Under this there are 3 directories which are currently source folders (I think? the icon is an open folder with a little orange grid in it) in my Eclipse project. I have dropped a new directory under c:\RemoteSrc which I also want to add to my project. BUT If I right click on my project and go "Build Path..." - "Link Source" and try to add it it tells me "Folder already exists with a different case". Yes i KNOW that the folder already exists THATS WHY IM TRYING TO ADD IT.

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• Code generating SOAP Web Service Proxy objects yourself - C#/.NET 3.5/T4

  - by tyndall

  Is there a framework or code already available that will give me more control over the code that gets generated based off my web references? I'm working at a new company. And the Web Services Proxies are all self contained in their own assembly. I would really rather generate this whole project. Every time they change something on the Services-side (Java) the WSDL references have to be dropped and re-added. (I can't figure out what those guys are doing on their end that messes with the WSDL bad enough that this needs to be done so much) Their are 10 of these references. I'd rather codegen the whole thing at compile time. Every time. What are my options?

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• Programatically Drop an External Div in JSTree

  - by Ted Mosbey

  I have a grid (slickgrid) which creates and destroys rows on the fly. I know jstree uses .jstree-draggable to find the external drag targets, but applying them to the grid rows doesn't work - such that I've thought of using the grid drag, and on finish of the grid drag I want to call the jstree "drag_finish": function (data) jQuery.jstree._reference($("#Tree")).dnd_finish(); The problem is that there is some null data. How would I Programatically Drop an External Div? How does jstree apply the .jstree-draggable targets? I could add the .jstree-draggable class to the grid drag helper, but it doesnt seem to fire when dropped on the tree although it clearly has the class. Any guidance would be greatly appreciated. Regards.

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• Best practices for extending third party databases?

  - by Eric Watkins

  I have a situation where our developers extended a Third party database (MS SQL) by adding tables, views, stored procedures, and functions. Recently when the vender issued updates to the database they dropped all of our custom objects. The question now is what are some best practices that will allow us to extend the third party database but keep our objects safe from future updates? My first thought is to create a separate database but then I’m stuck with fully qualifying all the references back to the original database which may cause issues promoting database changes from test to production.

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• Assembly not referenced error with Interactive Brokes ActiveX API

  - by Lirik

  I'm attempting to use the Interactive Brokers ActiveX API, but I'm having a little trouble: error CS0012: The type 'System.Windows.Forms.AxHost' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. My code: namespace DataFeed.Gateway { class IBGateway : IGateway { private AxTWSLib.AxTws tws; //<-- the error line //... } } I have a console application, so I'm wondering if that might be the reason why ActiveX is not working... or is there something else going on here? Maybe I should add the AxTWSlib.dll to the GAC, but do I really have to? If I add the dll as a resource, then I thought that I don't need to add it to the GAC. Note: I've dropped the AxTWSlib.dll in my project folder and I've added it to the project references... no problems there.

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• HTML5: dragover(), drop(): how get current x,y coordinates?

  - by Pete Alvin

  How does one determine the (x,y) coordinates while dragging "dragover" and after the drop ("drop") in HTML5 DnD? I found a webpage that describes x,y for dragover (look at e.offsetX and e.layerX to see if set for various browsers but for the life of me they ARE NOT set). What do you use for the drop(e) function to find out WHERE in the current drop target it was actually dropped? I'm writing an online circuit design app and my drop target is large. Do I need to drop down to mouse-level to find out x,y or does HTML5 provided a higher level abstraction?

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• Creating a skin engine in MVC

  - by Joe

  Does anyone have any experience creating a skin engine for asp.net MVC? I know the suggested approach is to use flexible markup with CSS, but I would like the ability for a new view to be dropped in, and the application use that one instead of the default one. Basically, I want to know how to tell the framework (at run time) to look into a specific folder for the views/content, and if the item isn't there to check the default locations. I started to look into how the Oxite blog engine does it, but it seems like that might be a bit much for what I need (I am still looking through it, so I could be wrong.) Any help is appreciated.

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• Accept-Encoding headers being sent by browser but not received by server

  - by Daniel Jacobs

  I have been trying to debug this for weeks. All of the browsers on all of the clients on my home network are sending 'Accept-Encoding: gzip,deflate'. However, that header is somehow, somewhere being dropped before the request makes it to a web server. For example, http://www.whatsmyip.org/http_compression/ says 'No, your browser is not requesting compressed content'. I've used Fiddler to make sure that all of my browsers are indeed sending the header. I've swapped out my router. I've turned off all anti-virus software. Brighthouse/Roadrunner (the local cable ISP) says they are not doing any filtering (and I can't see why they would in this case). Any suggestions would be most welcome!

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• Conditionally embed ASP.NET MVC2 Views as resources during build in Visual Studio 2010

  - by jslatts

  I have a ASP.NET MVC2 project in VS2010 that can be deployed in two modes: standalone or plugin. In standalone mode, the views should live outside the compiled assembly as .aspx files (the default setup). In plugin mode, the views are switched (currently by hand) to embedded resources and the entire assembly is dropped into a host project folder. Currently, this requires the developer to go through each view and switch it from Build Action: "Content" to "Embedded Resource" and vice versa. I would like to create a new solution configuration to automatically grab all .aspx files and build them as resources. This SO post seems like the solution, but I would prefer not to have to edit the .csproj every single time I add a new view to the project. Is there a way to use a wild cards or some other batch/global conditionally statement to change resources from content to embedded?

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• ASP.NET MVC v1 project upgraded to VS 2010 no longer will debug. Why?

  - by Todd Brooks

  I'm getting the message "The breakpoint will not currently be hit. No symbols have been loaded for this document." I have a S#arp Architecture project (ASP.NET MVC v1) that has been opened and upgraded to be used in VS 2010. I can no longer debug the project. I'm running Windows 7 Ultimate x64 and Visual Studio 2010 Ultimate. I have IE set to be my default browser. I have the build set to debug. System.Web.Mvc is referenced in my project's lib dir. I've cleaned the solution. I've recompiled the solution. It's set to use .NET Framework 3.5. PDBs are being created and dropped into the bin directory with the DLLs. Any help will be greatly appreciated.

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• Using @NotNull in a project where both IntelliJ and Eclipse developers are working

  - by Gugussee

  A co-worker on IntelliJ IDEA (working on another project) showed me the amazing @NotNull annotation. I've read messages here on SO about how starting to add @NotNull everywhere saved lots of time and headaches (and IntelliJ 10 can even add automatically @NotNull to old code when it detects that null would break havoc). Since I read my first "Probable @NotNull violation" message (in real-time, in the IDE, even on a partial .java file that doesn't compile yet) my jaw dropped and I got hooked. So I was wondering: is there anything that needs to be known if we want to start using @NotNull in a project where developers are using both Eclipse and IntelliJ? I know IntelliJ ships with the annotations.jar. Is this compatible with Eclipse?

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• Can I override DropLocation target to avoid network latency?

  - by Chad

  In Team Build 2008, the Drop Location for a build is no longer specified in the .proj file, and instead is stored in the database and maintained in the GUI tool. The GUI tool only accepts a network path as a drop location (i.e. \\server\share) and will not accept a local path. Our build server also hosts the dropped files, so it seems that forcing a file copy operation to go through the network share introduces a lot of lag time when copying a large number of files. I would like to override this feature so that I can specify a local directory for drop location, but I can't figure out how.

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• Are there any open source SimpleTest Test Cases that test PHP SPL interfaces

  - by JW

  I have quite a few objects in my system that implement the PHP SPL Iterator interface. As I write them I also write tests. I know that writing tests is generally NOT a cut 'n paste job. But, when it comes to testing classes that implement Standard PHP Library interfaces, surely it makes sense to have a few script snippets that can be borrowed and dropped in to a Test class - purely to test that particular interface. It seems sensible to have these publicly available. So, I was wondering if you knew of any?

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• How to reliably measure available memory in Linux?

  - by Alex B

  Linux /proc/meminfo shows a number of memory usage statistics. MemTotal: 4040732 kB MemFree: 23160 kB Buffers: 163340 kB Cached: 3707080 kB SwapCached: 0 kB Active: 1129324 kB Inactive: 2762912 kB There is quite a bit of overlap between them. For example, as far as I understand, there can be active page cache (belongs to "cached" and "active") and inactive page cache ("inactive" + "cached"). What I want to do is to measure "free" memory, but in a way that it includes used pages that are likely to be dropped without a significant impact on overall system's performance. At first, I was inclined to use "free" + "inactive", but Linux's "free" utility uses "free" + "cached" in its "buffer-adjusted" display, so I am curious what a better approach is. When the kernel runs out of memory, what is the priority of pages to drop and what is the more appropriate metric to measure available memory?

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• Changing ylim (axis limits) drops data falling outside range. How can this be prevented?

  - by Alex Holcombe

  df <- data.frame(age=c(10,10,20,20,25,25,25),veg=c(0,1,0,1,1,0,1)) g=ggplot(data=df,aes(x=age,y=veg)) g=g+stat_summary(fun.y=mean,geom="point") Points reflect mean of veg at each age, which is what I expected and want to preserve after changing axis limits with the command below. g=g+ylim(0.2,1) Changing axis limits with the above command unfortunately causes veg==0 subset to be dropped from the data, yielding "Warning message: Removed 4 rows containing missing values (stat_summary)" This is bad because now the data plot (stat_summary mean) omits the veg==0 points. How can this be prevented? I simply want to avoid showing the empty part of the plot- the ordinate from 0 to .2, but not drop the associated data from the stat_summary calculation.

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• Limiting the number of threads executing a method at a single time.

  - by Steve_

  We have a situation where we want to limit the number of paralell requests our application can make to its application server. We have potentially 100+ background threads running that will want to at some point make a call to the application server but only want 5 threads to be able to call SendMessage() (or whatever the method will be) at any one time. What is the best way of achieving this? I have considered using some sort of gatekeeper object that blocks threads coming into the method until the number of threads executing in it has dropped below the threshold. Would this be a reasonable solution or am I overlooking the fact that this might be dirty/dangerous? We are developing in C#.NET 3.5. Thanks, Steve

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• Stack trace with incorrect line number

  - by adrianbanks

  Why would a stack trace show "line 0", but only for one frame in the stack trace? eg. ... at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader() at My.LibraryA.Some.Method():line 16 at My.LibraryB.Some.OtherMethod():line 0 at My.LibraryB.Some.Method():line 22 at My.LibraryA.Some.Method():line 10 Background: I have an application that is failing with an exception, and is logging a stack trace to its log file. When the applciation was built, all assemblies were compiled with full debug info (Project Properties - Build - Advanced - Debug Info - Full), and so PDB files were generated. To help me diagnose where the error is coming from, I dropped the PDB files into the application's bin directory, and reproduced the exception. All line numbers for each stack frame look correct, with the exception of one which displays "line 0" as its source.

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• Help System.Web.Compilation.BuildManager find a type in a non-referenced assembly

  - by asbjornu

  I'm trying to write a plug-in system where assemblies can be dropped in a folder that ASP.NET has no knowledge about. This plug-in system works fine for ASP.NET MVC based assemblies, but for old-school WebForm assemblies (where the .aspx files Inherits the System.Web.UI.Page derived classes) System.Web.Compilation.BuildManager is responsible for compiling the .aspx file into a dynamic assembly. My problem is that the BuildManager knows nothing about the assemblies within my plug-in folder and it seems to be absolutely nothing I can do to help it. If I do: BuildManager.GetType("Type.Defined.In.Plugin.Assembly", true, true) it throws. If I first get a reference to the Type and then try: var instance = BuildManager.CreateInstanceFromVirtualPath(path, type); it still throws, even though I've now passed in the specific type it needs to compile the .aspx file. Is there anything I can do to help BuildManager find the types it needs to compile the .aspx file?

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• Optimizing MySQL statement with lot of count(row) an sum(row+row2)...

  - by Zombies

  I need to use InnoDB storage engine on a table with about 1mil or so records in it at any given time. It has records being inserted to it at a very fast rate, which are then dropped within a few days, maybe a week. The ping table has about a million rows, whereas the website table only about 10,000. My statement is this: select url from website ws, ping pi where ws.idproxy = pi.idproxy and pi.entrytime > curdate() - 3 and contentping+tcpping is not null group by url having sum(contentping+tcpping)/(count(*)-count(errortype)) < 500 and count(*) > 3 and count(errortype)/count(*) < .15 order by sum(contentping+tcpping)/(count(*)-count(errortype)) asc; I added an index on entrytime, yet no dice. Can anyone throw me a bone as to what I should consider to look into for basic optimization of this query. The result set is only like 200 rows, so I'm not getting killed there.

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• Back Button gets Disabled on IE 7,8 for an ASP.NET site

  - by timeitquery

  In an ASP.NET 3.5 website we are noticing that the back button is not working properly. If the user does several postbacks (say 10 times), and than starts pressing back button - the back button gets disabled before the user gets through all the pages. The site does not use AJAX.net. I can reproduce the issue on IE 7 and 8 almost always. The problem seems to be with some sort of limit IE has on History Cache for a given tab/instance. In the tests I did the post request to the server are large - around 83k, and the responses are are round 300k. It seems that with these request sizes the history does not hold more than 4 items. The moment I get to the 5 post, the first item i had selected is dropped.

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• Drag/Drop movieclip event in JSFL? (Flash IDE)

  - by niels

  Lately im trying to do some experimental things with JSFL, and i was wondering if it is possible to listener for an event when a component (that i have made) or movieclip is dragged from library on the stage. i want to create something that i'll get a component and drop it on a mc. when the component is dropped on the mc the component will save the mc as a reference in some var. maybe with events isnt the way to go but i have no clue if this is possible or how to do it another way. i hope someone can help me get started thx in advance

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• Saving Bitmap from Clipboard to File Error

  - by Vanwaril

  I'm using OLEDropTarget to get dropped content. It works fine with text. However, I'm not able to figure out how to get bitmaps from CF_BITMAP type data objects and save them to file. My code: HGLOBAL hg = pDataObject->GetGlobalData(CF_BITMAP); if (NULL == hg) { return FALSE; } HBITMAP pData = (HBITMAP)GlobalLock(hg); if(pData == NULL) return false; HBITMAP bmp; ::GetObject(pData,sizeof(HBITMAP),&bmp); CImage cnn; cnn.Attach(bmp); cnn.Save(L"here.bmp",Gdiplus::ImageFormatBMP); I get an error on the Attach, but when debugging I noticed that the GetObject doesn't make a copy into the second HBITMAP.

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