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• Reading file resource in Unix and MacOS

  - by Sanjeev

  Hi, I am writing my first wxWidgets application which aims to be cross-platform. The program uses dll file for plugins and in Windows, reads dll resource part for information regarding plugin name, author name etc. I have never used Unix or MacOS (little Linux though) and am wondering whether compiling binary for these other OSes will require changes to the code written for Windows. For instance, is there a DLL equivalent in Unix and MacOS? Are there any provisions of compiling resource strings and files into a such files? Thanks, Sanjeev

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• Python unit-testing with nose: Making sequential tests

  - by cool-RR

  I am just learning how to do unit-testing. I'm on Python / nose / Wing IDE. (The project that I'm writing tests for is a simulations framework, and among other things it lets you run simulations both synchronously and asynchronously, and the results of the simulation should be the same in both.) The thing is, I want some of my tests to use simulation results that were created in other tests. For example, synchronous_test calculates a certain simulation in synchronous mode, but then I want to calculate it in asynchronous mode, and check that the results came out the same. How do I structure this? Do I put them all in one test function, or make a separate asynchronous_test? Do I pass these objects from one test function to another? Also, keep in mind that all these tests will run through a test generator, so I can do the tests for each of the simulation packages included with my program.

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• How to limit / throttle bandwidth with *multiple* connections

  - by Led

  I'm writing an app in C# that downloads concurrently (in different threads) using multiple connections to multiple servers, and I'd like to be able to limit the used bandwidth. For a single connection the solution would be simple; I'd use the solution posted here : http://www.codeproject.com/KB/IP/Bandwidth_throttling.aspx which calculates a sleep-time for the single connection. I'd like to know what the best way is to do this for multiple connections. Using the ThrottledStream posted above and dividing the bandwidth (say 2MB/sec) evenly among the connections isn't right, if I'd have 3 very slow connections and 1 very fast one they'd all be capped to 512kb/sec, so the fast one won't go above 512kb/sec and the other 3 wouldn't even make that. The preferred solution I think is to cap only the fastest connection(s) so the slower connections are used optimally. Does anyone have any experience with this, example code or any advice ?

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• Avoid painting over nested controls

  - by Cobus Kruger

  I am writing a toolbar-style control and use the ThemeServices unit to paint the background required by the toolbar. Like so: ThemeServices.DrawElement(Canvas.Handle, ThemeServices.GetElementDetails(trRebarRoot), ARect); I then drop child controls onto the toolbar and voila - instant toolbar. Except that every now and again I notice that the nested (child) controls don't repaint as well. So my control paints its background and the child controls disappear until you move the mouse over them. Some of the edit controls show their client area (no border) and some of them are just gone altogether. This happens mostly when I place a window from another application over the toolbar and move it away. I keep thinking this has to be very easy to cure, that perhaps I'm somehow preventing the paint message from reaching the child controls, or missing an override but I have been unable to figure it out.

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• Can a PL/pgSQL function contain a dynamic subquery?

  - by morpheous

  I am writing a PL/pgSQL function. The function has input parameters which specify (indirectly), which tables to read filtering information from. The function embeds business logic which allows it to select data from different tables based on the input arguments. The function dynamically builds a subquery which returns filtering data which is then used to run the main query. My questions are: Is it 'legal' to use a dynamic subquery in a PL/pgSQL function. I cant see why not - but this question is related to the next one. AFAIK, PL/pgSQL are cached or precompiled by the query engine. How does having a function that generates dynamic subqueries impact the work of the query engine?

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• Should I supress CA1062: Validate arguments of public methods?

  - by brickner

  I've recently upgraded my project to Visual Studio 2010 from Visual Studio 2008. In Visual Studio 2008, this Code Analysis rule doesn't exist. Now I'm not sure if I should use this rule or not. I'm building an open source library so it seems important to keep people safe from doing mistakes. However, if all I'm going to do is throw ArgumentNullException when the parameter is null, it seems like writing useless code since ArgumentNullException will be thrown even if I won't write that code. Should I remove that rule or fix the violations?

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• Source Controlled Database Data import strategies.

  - by H. Abraham Chavez

  So I've gotten a project and got the db team sold on source control for the db (weird right?) anyway, the db already exists, it is massive, and the application is very dependent on the data. The developers need up to three different flavors of the data to work against when writing SPROCs and so on. Obviously I could script out data inserts. But my question is what tools or strategies do you use to build a db from source control and populate it with multiple large sets of data?

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• C# Win Forms Thread Pool - Unresponsive UI

  - by Goober

  Scenario I have a Windows Form Application. Inside the main form there is a loop that iterates around 3000 times, Creating a new instance of a class on a new thread to perform some calculations. Baring in mind that this setup uses a Thread Pool, the UI does stay responsive when there are only around 100 iterations of this loop (100 Assets to process). But as soon as this number begins to increase heavily, the UI locks up into eggtimer mode and the thus the log that is writing out to the listbox on the form becomes unreadable. Question Am I right in thinking that the best way around this is to use a Background Worker? And is the UI locking up because even though I'm using lots of different threads (for speed), the UI itself is not on its own separate thread? Suggested Implementations greatly appreciated.

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• Interfacing my application with existing authentication systems

  - by Karan Bhangui

  I'm writing a web based application that will have its own authorization/authentication mechanism (traditional cookie/session based user/pass). However, depending on the organization that licenses the software, I want them to be able to plug in their own existing internal authentication system as a way to replace mine. Ideally, they'd have to run as little code as possible on their end; I'm trying to make this a mostly hosted service. I'm aware of the existence of OAuth, but don't entirely understand how I would go about implementing the system at a higher level. Any tips would be appreciated.

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• How determine database server IP via UDP in Java

  - by Wolfgang Lenhard

  Hi, I am writing clients in Java that store the data on a database server. So far, the IP and Port of the server has to be specified in the client's settings manually. I have heard, that it is possible to automatically determine the IP of database servers via broadcast / multicast / UDP (I am not familiar with these concepts). Question: Is there a way to retrieve the IP adresses of all available database-servers in the local network? I am working with the h2 database system so far. Bye, Wolfgang

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• wpf trigger events after a few milli-seconds!!!

  - by Rev

  Hi What was that "wpf trigger events after a few Milli-seconds" ;) Let me explain about that: I have a wpf form with few controls. some of these control over-writing template. for example a textblock with an effect will be trigger on Mouse-Enter event and change color of foreground to something else. But after running program when mouse enter on textBloc, it takes a few Milli-seconds until Mouse-enter event triggers. also all control or better say all control which use mouse-events have this problem. How solve this problem???

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• Firefox Extension needs to get cookie from PHP redirected external page.

  - by Tyler

  I am writing a firefox extension that interacts with a JSON server interface. I receive a url to the server which then redirects to the client site that provides the cookie. I need to be able to set this cookie in the users browser without physically loading it in the browser. Is this possible through an AJAX call? I tried using a hidden iframe, however firefox does not seem to like a php redirect in the iframe. My current solution is to load the site in a second tab that never gains focus and then auto close it when the cookie is set. This is very messy and would prefer something more streamlines. Any thoughts?

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• How to generate entity classes from nhibernate mapping files during runtime.

  - by Denis Rosca

  Hello, i need some help with c# and nhibernate. I'm working on a project that requires the entity classes to be generated from hbm files at runtime. I get the mapping files from a service, and then need to generate the classes dynamicaly and configure nhibernate to use them. The problem is that i'm new to nhibernate and not much of a pro in c#, so me writing the piece of code that achieves this is very error-prone. I was wondering if you know of any open source software that i could use. Worst case scenario (if can't find anything that even remotely resembles what i need), do you guys have some advice on where should i start? Maybe some links ? Thanks, Denis.

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• Embedding Ruby, calling a function from C

  - by ThePower

  Hi, I'm writing an app that calls ruby code from c. I am having a little difficulty and wondered if anyone could point me in the rite direction. I currently have in my C. #include ruby.h main() { ruby_init(); rb_require("myRubyFile"); rb_funcall(rb_module_new(), rb_intern("RubyFunction"), 0, NULL); } My ruby file is in the same directory as my c file and is called myRubyFile.rb and contains a definition of the function RubyFunction(). This is a cut down of what I actually want to do, just making it more readable for others. I just require some feedback as to whether this is the correct method to call ruby code from my c file. Regards

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• When is assembler faster than C?

  - by Adam Bellaire

  One of the stated reasons for knowing assembler is that, on occasion, it can be employed to write code that will be more performant than writing that code in a higher-level language, C in particular. However, I've also heard it stated many times that although that's not entirely false, the cases where assembler can actually be used to generate more performant code are both extremely rare and require expert knowledge of and experience with assembler. This question doesn't even get into the fact that assembler instructions will be machine-specific and non-portable, or any of the other aspects of assembler. There are plenty of good reasons for knowing assembler besides this one, of course, but this is meant to be a specific question soliciting examples and data, not an extended discourse on assembler versus higher-level languages. Can anyone provide some specific examples of cases where assembler will be faster than well-written C code using a modern compiler, and can you support that claim with profiling evidence? I am pretty confident these cases exist, but I really want to know exactly how esoteric these cases are, since it seems to be a point of some contention.

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• A method to change effective user id of a running program?

  - by Brendan Long

  I'm writing a simple package manager and I'd like to automatically try sudo if the program isn't run as root. I found a function called seteuid, which looks likes it's exactly what I need, but I don't have the permissions to run it. So far all I can think of is a bash script to check before they get to the actual binary, but I'd like to do this all as C++ if possible. Is there any method of changing a processes's euid after it starts executing? Or a way to call sudo?

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• Static Evaluation Function for Checkers

  - by Kamikaze

  Hi all! I'm trying to write an evaluation function for a game of checkers that I'm developing but I can't find the right documentation. I've read several documents on the web witch describe different techniques for either writing one or letting the computer find it(using genetic algorithms or Bayesian learning) but they're too complicated for a novice like me. All documents pointed a reference to "Some studies in machine learning using the game of checkers" by A.L.Samuel but I couldn't get my hands on it yet :(. I've only read the follow up "Some studies in machine learning using the game of checkers -II" and found some good info there, but it doesn't explain what the eval parameters mean (I think I don't have the whole article). Thanks for your help!

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• Best tools for collaborating with small number of people

  - by Mark Szymanski

  Hi, I am collaborating with someone on a project and currently use Skype for collaboration. I like it because we can be on a call to say things that are hard to say by typing out. We can share our screens so we can help with code writing. And we can use the text chat to copy-paste code between each other. We also use Subversion for version control. I just wanted to know what other people used for collaborating with others so I could see whats out there to use. Thanks!

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• Junit vs TestNG

  - by Sam Merrell

  At work we are currently still using Junit3 to run our tests. We have been considering switching over to Junit4 for new tests being written but I have been keeping an eye on TestNG for a while now. What experiences have you all had with either Junit4 or TestNG and which seems to work better for very large numbers of tests. Having flexibility in writing tests is also important to us since our functional tests cover a wide aspect and need to be written in a variety of ways to get results. Old tests will not be re-written as they do their job just fine. What I would like to see in new tests though is flexibility in the way the test can be written, natural assertions, grouping, and easily distributed test executions.

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• Google Wave as code repository and IDE?

  - by dehmann

  Is it possible to write a Google Wave plugin that turns it into an IDE for programming? With such an extension, Google Wave would be a replacement for Eclipse etc., and it would naturally be a code repository at the same time (replacing SVN, git, etc.). Users (programmers) would be able to create code files directly in Wave and add collaborators to do pair programming etc. The whole codebase would live in a Wave folder, and an extension would do the building and compiling on the fly. How would one go about writing such an extension?

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• Visual Studio msbuild

  - by user62958

  I have a question regarding the commandline options of msbuild. I am currently using msbuild to build projects using the existing solution files. These solution files have references to external dll which have different paths on each machine. I am currently writing a build script and passing the specific path to the project file via the /p: switch of msbuild. My current build line is: msbuild test.sln /p:ReferencePath="c:\abc" /p:ReferencePath="c:\rca" What i have noticed that Reference Path now contains only c:\rca and not c:\abc. this is causing problems for me since, the external dlls lie in two different directorys. I am allowed to keep multiple reference paths via visual studio, but not via the commandline. Is there any known way by which i can do this

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• Using DLL that using COM in C#

  - by chekalin-v

  I have been writing DLL on C++, that will be use in C#. DLL have some function, where I call hres = CoInitializeEx(NULL, COINIT_MULTITHREADED); and next call hres = CoInitializeSecurity( NULL, -1, // COM authentication NULL, // Authentication services NULL, // Reserved RPC_C_AUTHN_LEVEL_PKT, // Default authentication RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation NULL, // Authentication info EOAC_NONE, // Additional capabilities NULL // Reserved ); There are no error then I trying to use this dll in C++. But if I call function from DLL via C# application I see Error (80010106) Cannot change thread mode after it is set. I changed hres = CoInitializeEx(NULL, COINIT_MULTITHREADED); to hres = CoInitialize(NULL); After this changes error appear after CoInitializeSecurity: (80010119) Security must be initialized before any interfaces are marshalled or unmarshalled. It cannot be changed once initialized. How resolve this trouble?

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• Write data to an xml file.

  - by Bobby

  My aim is to write an XML file with few tags whose values are the regional language. I'm using Python to do this and using IDLE(Pythong GUI) for programming. While I try to write the words in an xmls file it gives the following error. UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-4: ordinal not in range(128) For now, I'm not using any xml writer library instead I'm opening a file "test.xml" and writing the data into it. This error is encountered by the line: f.write("\t\" + data + "\"). If I replace the above write statement with print statement then it prints the data properly on Python Shell. I'm reading the data from an excel file which is not in the UTF8,16, or 32 encoding formats. Its in some other format. cp1252 is reading the data properly. Any help in getting this data writtent oan xml would be highly appreciated. Thanks in advance. Bob

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• Does my AMD-based machine use little endian or big endian?

  - by Frank

  I'm going though a computers system course and I'm trying to establish, for sure, if my AMD based computer is a little endian machine? I believe it is because it would be Intel-compatible. Specifically, my processor is an AMD 64 Athlon x2. I understand that this can matter in C programming. I'm writing C programs and a method I'm using would be affected by this. I'm trying to figure out if I'd get the same results if I ran the program on an Intel based machine (assuming that is little endian machine). Finally, let me ask this: Would any and all machines capable of running Windows (XP, Vista, 2000, Server 2003, etc) and, say, Ubuntu Linux desktop be little endian? Thank You, Frank

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• How to get a clipboard paste notification and provide my own data?

  - by Uwe Keim

  For a small utility I am writing (.NET, C#), I want to monitor clipboard copy operations and clipboard paste operations. My idea is to provide my own data when pasting into an arbitrary application. The monitoring of a copy operation can be easily done by using a clipboard viewer. Something that seems much more advanced to me is to write a "clipboard paste provider": Answer to "what formats are available" queries of applications. Supply data to application paste operations. I found this posting and this posting, but none of them seems to really help me. What I guess is that I somehow have to mimic/hijack the current clipboard. Question: Is it possible to "wrap" the clipboard in terms of paste operations and provide my own kind of "clipboard proxy"? Thanks Uwe

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