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• How to negotiate red5 connection parameters for streaming with JAVA

  - by baba

  Hi, I have been creating a thin browser client (on java) that sends an RTMP stream to a specified red5 instance. I also use RTMP Researcher to monitor the traffic and events that occur between the client and the server. Here is what I note: There is obviously a map with options that is being exchanged between the red5 instance and the client. You can see it here: (direct link : http://img716.imageshack.us/img716/661/newbitmapimagelb.png ) What I am wondering about is is there a programmatic way to obtain this map in the client side and maybe change some of the parameters or just examine them Edit: I am connecting like this connect ( host, port, app, callback ); . I assume I am sending some default parameters along, because the other connect methods have also an optionsMap as an argument. I was wondering what are the possible values that could be put in such an optionsMap and where to obtain a list of them?

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• How to provide js-ctypes in a spidermonkey embedding?

  - by Triston J. Taylor

  Summary I have looked over the code the SpiderMonkey 'shell' application uses to create the ctypes JavaScript object, but I'm a less-than novice C programmer. Due to the varying levels of insanity emitted by modern build systems, I can't seem to track down the code or command that actually links a program with the desired functionality. method.madness This js-ctypes implementation by The Mozilla Devs is an awesome addition. Since its conception, scripting has been primarily used to exert control over more rigorous and robust applications. The advent of js-ctypes to the SpiderMonkey project, enables JavaScript to stand up and be counted as a full fledged object oriented rapid application development language flying high above 'the bar' set by various venerable application development languages such as Microsoft's VB6. Shall we begin? I built SpiderMonkey with this config: ./configure --enable-ctypes --with-system-nspr followed by successful execution of: make && make install The js shell works fine and a global ctypes javascript object was verified operational in that shell. Working with code taken from the first source listing at How to embed the JavaScript Engine -MDN, I made an attempt to instantiate the JavaScript ctypes object by inserting the following code at line 66: /* Populate the global object with the ctypes object. */ if (!JS_InitCTypesClass(cx, global)) return NULL; /* I compiled with: g++ $(./js-config --cflags --libs) hello.cpp -o hello It compiles with a few warnings: hello.cpp: In function ‘int main(int, const char**)’: hello.cpp:69:16: warning: converting to non-pointer type ‘int’ from NULL [-Wconversion-null] hello.cpp:80:20: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] hello.cpp:89:17: warning: NULL used in arithmetic [-Wpointer-arith] But when you run the application: ./hello: symbol lookup error: ./hello: undefined symbol: JS_InitCTypesClass Moreover JS_InitCTypesClass is declared extern in 'dist/include/jsapi.h', but the function resides in 'ctypes/CTypes.cpp' which includes its own header 'CTypes.h' and is compiled at some point by some command during 'make' to yeild './CTypes.o'. As I stated earlier, I am less than a novice with the C code, and I really have no idea what to do here. Please give or give direction to a generic example of making the js-ctypes object functional in an embedding.

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• Monitoring outgoing internet traffic

  - by Frane

  Is there a way to monitoring internet traffic programatically? I would like to log the pages users are visiting on the Internet. Can this be achieved with .NET code, is there a 3rd party .NET component that could be used to retrieved data. Information about Internet traffic must be stored to a database so I cannot use a plugin or something for IE. We are also looking to include this code into our existing product so we cannot use a 3rd party product that cannot be redistributed. It would be cool if this thing could monitor traffic for all browsers but monitoring IE traffic might also be sufficient.

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• Applet Not Loading In Java 1.6.0_16

  - by Wayne Hartman

  I am running a Java applet compiled in 1.5 and am experiencing odd behavior when running it on computers running 1.6.0_07 and 1.6.0_16. On the *_07 version, the applet initializes and loads in the browser perfectly fine. However, computers with the *_16 are not loading at all. Even more strange, there is nothing in the Java Console to indicate any problems will loading the applet in the browser. If I run the applet from as a standalone app on said machines, it loads up just fine. The compatibility mode in the JNLP is set to 1.5+. Firefox reports no errors attempting to load the applet. Even with full tracing and logging set to all, nothing is reported in the console window. Quick facts: The JAR is signed Compiled in 1.5 Works flawlessly in browsers (FF & IE) running *_07 Does not work in browsers (FF & IE) running *_16 Works running as stand alone app in *_16 JNLP set to 1.5+ Clients are mixed *_07, *_16, and other version of 1.6 Things I have tried: Forcing the JVM to use version 1.6.0_07. This requires the user to download *_07. In my situation this is not an option, unfortunately. Ran the app on *_16 as a standalone app. This works fine, but this needs to run as an applet. Ideas?

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• Real-time aggregation of files from multiple machines to one

  - by dmitry-kay

  I need a tool which gets a list of machine names and file wildcards. Then it connects to all these machines (SSH) and begins to monitor changes (appendings to the end) in each file matched by wildcards. New lines in each such file are saved to the local machine to the file with the same name. (This is a task of real-time log files collecting.) I could use ssh + tail -f, of course, but it is not very robust: if a monitoring process dies and then restarts, some data from remote files may be lost (because tail -f does not save the position at which it is finished before). I may write this tool manually, but before - I'd like to know if such tool already exists or not.

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• InstallExecuteSequence cache interferes with custom action operation

  - by Dima G

  I need to upgrade a product that could be installed in per-user context to a new version that is always in per-machine context. The requirements are: Whether the old version was installed in a Per-User (no matter who) or Per-Machine context should be completely seamless to an administrator user that performs the upgrade. The MSI upgrade should succeed without the need to know the password of the user that originally installed the previous version of the product in a Per-User context. The installation should be performed from a single .msi file (no setup.exe is allowed). The installation should be able to run in a silent (non-UI) mode. No reboots are allowed during installation. My strategy is to find in the beginning of the installation whether the product is already installed in per-user context, and if so, to transform the registry keys manually to Per-Machine context (I checked: no additional changes such as file system changes etc. are needed except this transform). I figured out how to move all appropriate keys in the registry from the user settings to the machine settings (pre-loaded appropriate user hive in case it didn't appear in HKEY_USERS) and created custom action that does it - and it does work when I run it as a stand-alone executable before running the MSI. The problem, however, is that when Windows Installer runs InstallExecuteSequence it first creates a 'cached product context' for all products. So when my custom action runs in the course of InstallExecuteSequence, this cache has already been created. Thus FindRelatedProducts action that determines if older product with same upgrade code exists looks on that cache and ignores the changes that my custom action applied. If before running the MSI the previous product was in per-user context, FindRelatedProducts will look at the cache and not apply the upgrade and remove the previous version, because the new product is in per-machine context, even though the previous product version is already configured to per-machine context in the registry by that time by my custom action. What can be done to solve this problem without violating the requirements stated above?

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• Is NUnit's ExpectedExceptionAttribute only way to test if something raises an exception?

  - by Dariusz Walczak

  Hello, I'm completely new at C# and NUnit. In Boost.Test there is a family of BOOST_*_THROW macros. In Python's test module there is TestCase.assertRaises method. As far as I understand it, in C# with NUnit (2.4.8) the only method of doing exception test is to use ExpectedExceptionAttribute. Why should I prefer ExpectedExceptionAttribute over - let's say - Boost.Test's approach? What reasoning can stand behind this design decision? Why is that better in case of C# and NUnit? Finally, if I decide to use ExpectedExceptionAttribute, how can I do some additional tests after exception was raised and catched? Let's say that I want to test requirement saying that object has to be valid after some setter raised System.IndexOutOfRangeException. How would you fix following code to compile and work as expected? [Test] public void TestSetterException() { Sth.SomeClass obj = new SomeClass(); // Following statement won't compile. Assert.Raises( "System.IndexOutOfRangeException", obj.SetValueAt( -1, "foo" ) ); Assert.IsTrue( obj.IsValid() ); } Edit: Thanks for your answers. Today, I've found an It's the Tests blog entry where all three methods described by you are mentioned (and one more minor variation). It's shame that I couldn't find it before :-(.

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• How to decide which colors to use that look most similar across most screens/monitors?

  - by Lyon

  Hi, I'm baffled. I'm trying to find suitable colors for a logo that would look similar across most monitors/screens. I know it's near impossible, but how does one end up with the color palette that new Google logo and Facebook "blue" uses for example? I've a monitor that has been calibrated, and a few laptop screens that have default settings. Yet both the Google logo and facebook's look similar (although they aren't using colors restricted to the web safe 216 palette. Any ideas? thoughts? Thanks

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• Python threads all executing on a single core

  - by Rob Lourens

  I have a Python program that spawns many threads, runs 4 at a time, and each performs an expensive operation. Pseudocode: for object in list: t = Thread(target=process, args=(object)) # if fewer than 4 threads are currently running, t.start(). Otherwise, add t to queue But when the program is run, Activity Monitor in OS X shows that 1 of the 4 logical cores is at 100% and the others are at nearly 0. Obviously I can't force the OS to do anything but I've never had to pay attention to performance in multi-threaded code like this before so I was wondering if I'm just missing or misunderstanding something. Thanks.

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• SQL Server 2008 replication failing with: process could not execute 'sp_replcmds'

  - by skb

  I have an issue with SQL replication that I am having trouble fixing. What I am doing is restoring two DBs from a production backup, and then installing replication between them. The replication seems to be configured without any errors, but when I look at the status I see error messages like this: I have an issue with SQL replication that I am having trouble fixing. What I am doing is restoring two DBs from a production backup, and then installing replication between them. The replication seems to be configured without any errors, but when I look at the status in Replication Monitor I see error messages like this: Error messages: The process could not execute 'sp_replcmds' on 'MYSERVER1'. Get help: http://help/MSSQL_REPL20011 Cannot execute as the database principal because the principal "dbo" does not exist, this type of principal cannot be impersonated, or you do not have permission. (Source: MSSQLServer, Error number: 15517) Get help: http://help/15517 The process could not execute 'sp_replcmds' on 'MYSERVER1'. Get help: http://help/MSSQL_REPL22037 What does this mean?

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• iphone Memory gets freed in debug mode but not in release mode

  - by gdr

  I have been testing my iPhone debug build on both my device and simulator with activity monitor, leaks, and object allocations. The code is pretty well optimized so I have decided to test the release build. I went into the project Menu and set the target build to be release, I then added the necessary header paths that my app is using to the headers search paths and ran the release build on the device with the above mentioned instruments. What I have noticed now is that memory that was freed when I used the debug build does not get freed when using release version. There is one place in my App that I remove a scroll view with some images which frees up a significant amount of memory when I use the debug build, but no memory is freed up in that place when I use the release version. Does someone have any ideas where I need to start looking at? did I setup my release build wrong?

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• Creating a variable-speed slideshow based on USB input on OSX.

  - by Dave A

  I have a friend who is trying to put together a geeky little contraption for a wedding, where people can view a slideshow. Neither of us use Macs, nor have programmed for one, but for various reasons it has to run on a Mac. There will be a USB ammeter hooked up to a bike dynamo. What we want is for a slideshow to be run, and advance at a speed relative to how fast someone is pedaling on a stationary bike. After much googling, it seems like we could load an iPhoto slideshow up via applescript. Is it possible to pause the slideshow and advance it with keypress commands? The applescript commands would be run via a bash script or similar that would monitor the value returned by the USB ammeter's command-line app and issue the keypress events accordingly. Is there some other app that could be likewise scripted to display photos?Hoping someone has some hints to get us started in the right direction! Thanks!

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• performance monitoring tools for multi-tenant web application

  - by Anton

  We have a need to monitor performance of our java web app. We are looking for some tolls which can help us with this task. The major difficulty is that we are SaaS provider with multi-tenant server architecture with hundreds of customers running on the same hardware. So far we tried commercial products like DynaTrace and Coradinat but unfortunately they don't get the job done so far. What we need is a simple report which would tell us if we had performance problems on each customer site in a specified period of time. Mostly it will be response time per customer but also we will need some more specifics based on the URLs. please let me know if someone had any experience with setting up such monitoring. Thanks!

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• I need to stop execution during recursive algorithm

  - by Shaza

  Hey, I have a problem in choosing the right method to accomplish my goal. I'm working on Algorithms teaching system, I'm using C#. I need to divide my algorithm into steps, each step will contain a recursion. I have to stop execution after each step, user can then move to the next step(next recursion) using a button in my GUI. After searching, threads was the right choice, but I found several methods: (Thread.sleep/interrupt): didn't work, my GUI freezed !! (Suspend/Resume): I've read that it's a bad idea to use. (Waithandles): still reading about them. (Monitor wait/resume). I don't have much time to try and read all previous methods, please help me in choosing the best method that fits my system.Any suggestions are extremal welcomed.

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• NSFetchedResultsController doesn't fetch up the child-parent moc chain?

  - by Kronusdark

  I cannot find any clarification on this, so it may be a bug. Problem is, I have a series of parent-child Managed Object Context's. When I save on a child context the changes get pushed up to the parent, and I can fetch using a plain old NSFetchRequest. However, if I rely on an NSFetchedResultsController to pull these changes into a sibling context to the first, they do not see them. calling -(void)performFetch: error; doesn't seem to pull the changes either. After a restart of the app, all new data is available. My hypothesis is that NSFetchedResultsController only fetches from its current context and will not follow the chain to the persistent store. Can someone please set me straight here? Am I going to have to use notifications to monitor changes on other contexts? and finally, is this mentioned somewhere in the doc's? I cannot find it for the life of me.

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• Monitoring for non-pgp files

  - by Aheho

  For privacy reasons, I want to prevent my users from posting unencrypted files to my ftp site. It is company policy that all data exchanges of sensitive data be encrypted with PGP. I'd like to setup a program to monitor the ftp folders and whenever a new file is placed there, verify that it is in fact encrypted. I can't just rely on the file extension because in some cases, our trading partners require a specific filename that doesn't have a .PGP on the end. Is there a library or another method I can use to verify that a given file is encrypted? I'm using C# and .NET on a windows platform.

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• Dynamically adding controls from an Event after Page_Init

  - by GenericTypeTea

  Might seem like a daft title as you shouldn't add dynamic controls after Page_Init if you want to maintain ViewState, but I couldn't think of a better way of explaining the problem. I have a class similar to the following: public class WebCustomForm : WebControl, IScriptControl { internal CustomRender Content { get { object content = this.Page.Session[this.SESSION_CONTENT_TRACKER]; return content as CustomRender; } private set { this.Page.Session[this.SESSION_CONTENT_TRACKER] = value; } } } CustomRender is an abstract class that implements ITemplate that I use to self-contain a CustomForms module I'm in the middle of writing. On the Page_Init of the page that holds the WebCustomForm, I Initialise the control by passing the relevant Ids to it. Then on the overridden OnInit method of the WebCustomForm I call the Instantiate the CustomRender control that's currently active: if (this.Content != null) { this.Content.InstantiateIn(this); } The problem is that my CustomRender controls need the ability to change the CustomRender control of the WebCustomForm. But when the events that fire on the CustomRender fire, the Page_Init event has obviously already gone off. So, my question is, how can I change the content of the WebCustomForm from a dynamically added control within it? The way I see it, I have two options: I separate the CustomRender controls out into their own stand alone control and basically have an aspx page per control and handle the events myself on the page (although I was hoping to just make a control I drop on the page and forget about) I don't use events and just keep requesting the current page, but with different Request Parameters Or I go back to the drawing board with any better suggetions anyone can give me.

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• Running out of memory but not seeing excessive object allocation in Instruments

  - by Scotty Allen

  I have an iPad app that's crashing due to low memory. However, Instruments doesn't show any significant amount of memory allocated using ObjectAlloc - it stays under 1MB for the lifetime of the application. Leaks shows less than 1kB leaked over the course of the run. Memory monitor shows the free memory on the devices drop significantly with use, eventually dropping to the point that it's out of memory. Here's a screenshot from Instruments: I'm totally stumped. As far as I can tell, this basically says that as far as my app is concerned, I'm never using more than about 750kB, but that the device is still running out of physical memory, which is causing my app to crash/force exit. I'm new to debugging memory issues with XCode. Am I measuring this wrong? Is there another way to see where this memory is going?

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• Who likes #regions in Visual Studio?

  - by Nicholas

  Personally I can't stand region tags, but clearly they have wide spread appeal for organizing code, so I want to test the temperature of the water for other MS developer's take on this idea. My personal feeling is that any sort of silly trick to simplify code only acts to encourage terrible coding behavior, like lack of cohesion, unclear intention and poor or incomplete coding standards. One programmer told me that code regions helped encourage coding standards by making it clear where another programmer should put his or her contributions. But, to be blunt, this sounds like a load of horse manure to me. If you have a standard, it is the programmer's job to understand what that standard is... you should't need to define it in every single class file. And, nothing is more annoying than having all of your code collapsed when you open a file. I know that cntrl + M, L will open everything up, but then you have the hideous "hash region definition" open and closing lines to read. They're just irritating. My most stead fast coding philosophy is that all programmer should strive to create clear, concise and cohesive code. Region tags just serve to create noise and redundant intentions. Region tags would be moot in a well thought out and intentioned class. The only place they seem to make sense to me, is in automatically generated code, because you should never have to read that outside of personal curiosity.

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• Loading Jscript files into Firefox extension

  - by colon3l

  Hi ! Let's get directly to the problem : I'm actually doing a firefox extension in which i would like to implement the jWebsocket API in order to build a small chat. I got my main script file, named test.js, and the jWebsocket lib into a js folder. Just for you to know, this is my first firefox extension ever. So in my XUL file I got this (for the script part only of course, the interface code is not shown) : <overlay id="test-overlay" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <script type="application/x-javascript" src="chrome://test/content/test.js" /> <script type="application/x-javascript" src="chrome://test/content/js/jwebsocket.js" /> jwebsocket.js being the file I need to call according to jWebsocket website. In my main script file test.js I start with : if (jws.browserSupportsWebSockets()) { jWebSocketClient = new jws.jWebSocketJSONClient(); } else { var lMsg = jws.MSG_WS_NOT_SUPPORTED; alert(lMsg); } jws being the namespace created into the jwebsocket.js file. Of course I've got the required stand-alone server running in background, and working. So from what I understood looking on various websites, is that if a js file is loaded into the javascript allocated memory space (with the tag), all namespace/function should be available between each file. But this was mostly for HTML-oriented issues, so I'm not sure if it applies to XUL/Firefox environment. But the script keep failing at the first jws call. Any ideas on what goes wrong here ? I'm stuck for 2 days now :/

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• Game engine deployment strategy for the Android?

  - by Jeremy Bell

  In college, my senior project was to create a simple 2D game engine complete with a scripting language which compiled to bytecode, which was interpreted. For fun, I'd like to port the engine to android. I'm new to android development, so I'm not sure which way to go as far as deploying the engine on the phone. The easiest way I suppose would be to require the engine/interpreter to be bundled with every game that uses it. This solves any versioning issues. There are two problems with this. One: this makes each game app larger and two: I originally released the engine under the LGPL license (unfortunately), but this deployment strategy makes it difficult to conform to the rules of that license, particularly with respect to allowing users to replace the lib easily with another version. So, my other option is to somehow have the engine stand alone as an Activity or service that somehow responds to intents raised by game apps, and somehow give the engine app permissions to read the scripts and other assets to "run" the game. The user could then be able to replace the engine app with a different version (possibly one they made themselves). Is this even possible? What would you recommend? How could I handle it in a secure way?

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• Why does Tomcat 6 hang when I shut it down?

  - by hoffmandirt

  I have Tomcat 6.0.24 64 bit installed on two Windows Server 2008 boxes as a Window's service. I use the Tomcat Monitor application to start and stop Tomcat. Randomly on both boxes, the server will not shutdown when the Stop Service option is selected. Both Start Service and Stop Service remain grayed out until I open a task manager and kill tomcat6.exe. This also happens with Tomcat 6.0.20 installed on these boxes, however it does not happen on my 32 bit Windows 7 machine. What is causing this?

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• How can you determine if Control.Visible is set via property or if the value is inherited

  - by JDMX

  I need to find a way to determine if the Visible property of a control is set via a property change or if is inheriting it value from its parent. Using the Reflector, I find that the functions this.GetVisibleCore() and this.GetState() are both internal methods so I cannot call them. The widgets themselves are created dynamically so I do not want to attach a method to the VisibleChanged event just after the creation of each widget so can try to monitor this property. If I have to, I guess I will but I am looking for something jsut a bit more elegant.

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• Looking for a real-time IMAP notification of new Emails

  - by Emil

  I'm looking for a way to monitor a GMail inbox for new e-mails. However, I want to avoid checking every few minutes and I'm looking for some sort of real-time notification. I've noticed that Outlook (and other IMAP-supporting clients) instantly show when there is a new e-mail, but unfortunately all .NET IMAP libraries seem to lack this functionality. Does anyone know of an IMAP library that has this functionality? Or is there another way to be instantly notified of new message without doing some short-period polling?

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• Technology Plan - Which tools should I use?

  - by Armadillo

  Hi, Soon, I'll start my own software company. My primary product/solution will be a Billing/Invoice Software. In a near future, I pretend to expand this first module to an ERP. My app should be able to run as a stand-alone application and as a Web-based application (so there will be, probably two GUI for the same Database). My problem, now, is to choose the right tools; I'm talking about what programming language(s) should I use, what kind of database should I choose, and stuff like that. I'm primarily a VB6 programmer, so probably I'll choose the .net framework (vb/c#). But I'm seriously thinking about Java. Java has 2 "pros" that I really like: write once, run anywhere and it is free (I think...). I've been thinking about RIAs too, but I just don't have any substantial feedback about them... Then, I'll need a report tool. Crystal Reports? HTML based Reports? Other? Databases: I'm not sure if I should use SQL-Server Express or PostgreSQL (or other). I'd be happy to hear any comments and advices Thanks

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