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• How many FPS should I have for updating a custom progress bar?

  - by Tom Dignan

  I just wrote a custom progress bar, it's single buffered and will remain so. How many frames per second are desirable for something like this? I don't want to waste too much CPU updating the screen unnecessarily.

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• C# dispatcher problem

  - by Bert

  Hi, In the constructor of an object i need to create a WPF mediaElement object: m_videoMedia = new MediaElement(); but the class can also be instantiated from a other thread so i need to use Dispatcher.Invoke(DispatcherPriority.Normal, (Action)(() => { m_videoMedia = new MediaElement(); })); But how can I get the right dispatcher instance in that constructor :s

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• Is it safe to read global data from multiple threads?

  - by user362515

  The scenario is as follows: Create an instance of a class (std::map) and sore it as global variable. Spawn threads. Threads read and use the same global instance of the class All spawned threads quit Global class instance is destroyed No mutex, no thread modifies the global class instance. Is this OK? Thank You

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• How to get the ID of the last insert.

  - by James Jeffery

  I have an application and around 20 accounts are created per minute (on average). I need to implement a new feature which requires the ID of the last insert. I am using PDO. The question is, lets say 5 users create accounts at exactly the same time. Will it return the ID from the database for that users profile that was just created, or will it return the last insert? If you get what I mean.

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• Multi-Dimensional Array and ArrayIndexOutOfBoundsException

  - by notset

  Hello, I have a strange problem which I can't fix: A field: private boolean[][][] gaps; Constructor (1st line): gaps = new boolean[NOBARRICADES][WIDTH][HEIGHT]; Constructor (2nd line): for (int i = 0; i < NOBARRICADES; i++) { JAVA throws an error for the 2nd line, saying: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException Does it have anything to do with JAVA syntax (the mistake is in these lines of code) or I should look for the problem somewhere else?

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• reading txt storing in different

  - by dev2

  ASp.NET application. In button click i am accessing one text file and reading content and storing in other destination. while both users clicking this button at a time deadlock(thread is being used by other process) will occurs so how to handle this i want to read each user one by one can any one suggest method to handle. i am looking to handle with waithandle events so can any one give a code sample for above scenario.

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• Is it save to read global data from multiple threads?

  - by user362515

  The scenario is as follows: Create an instance of a class (std::map) and sore it as global variable. Spawn threads. Threads read and use the same global instance of the class All spawned threads quit Global class instance is destroyed No mutex, no thread modifies the global class instance. Is it ok? Thank You

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• Perl Term::ReadKey don't wait for newline

  - by tim

  In a perl script, I'm trying to accept input without blocking and without echoing the characters entered (The script is producing output and I want to have 'hotkeys' to alter its behaviour). I got as far as using use Term::ReadKey; ReadMode( "cbreak", STDIN ); if($input = ReadKey($pause_time, STDIN)){ #process input } But once the user types anything then the script stops until a newline is entered. I'd like the input to be processed per-character, without waiting for a newline.

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• JavaScript: Is there any "python's Generator" equivalent in JavaScript?

  - by JackSMTV

  Is there any "python's Generator" equivalent in JavaScript? PS: Python's Generator is very memory efficient when we need to do one time iterate through a big array, hash... "Generators are iterables, but you can only read them once. It's because they do not store all the values in memory, they generate the values on the fly" (Python's Generator explained in this thread: The Python yield keyword explained )

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• What does ObjectName(parameter) refer in the structure OBJECT_ATTRIBUTE?

  - by kiddo

  hi all, I found this structure called OBJECT_ATTRIBUTE in one of the nt dll functions..I was curious to know about that structure and I went through its documentation(msdn)...In the OBJECT_ATTRIBUTE structure there is a parameter called PUNICODE_STRING objectName...As per the msdn documentation..it says that the objectName "the name of the object for which a handle is to be opened" which is actually a name or some root directory,am confused with this.Can anybody explain this term "name of the object"(root directory).what it represents.

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• Different Assembly Name for Each Platform Target

  - by Murray

  I need to generate different assembly names depending on the platform target. For example, I have a console application "bob.exe". Instead of building for AnyCPU, I need to build explicitly for x86 and x64 and thus want "bob32.exe" and "bob64.exe". The Application tab in Visual Studio 2010 project options disables the Platform combobox. Build Events also don't allow options per platform so I can't rename it afterwards very easily.

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• Implement "tail -f" in C++

  - by Hamming

  Hi! I want to create a small code in C++ with the same functionality as "tail-f": watch for new lines in a text file and show them in the standard output. The idea is to have a thread that monitors the file Is there an easy way to do it without opening and closing the file each time?

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• Benchmarks for Single and MultiThreaded programs

  - by user280848

  Hi I am trying to compare the performance of Single and Multithreaded Java programs. Are there any single thread benchmarks which are available which I could then use and convert to their multithreaded version and compare the performance. Could anybody guide me as to what kind of programs(not very small) are suitable for this empirical comparison. Thanks in advance

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• Are parallel calls to send/recv on the same socket valid?

  - by Jay

  Can we call send from one thread and recv from another on the same socket? Can we call multiple sends parallely from different threads on the same socket? I know that a good design should avoid this, but I am not clear how these system APIs will behave. I am unable to find a good documentation also for the same. Any pointers in the direction will be helpful.

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• Why would Mathematica break normal scoping rules in Module?

  - by Davorak

  As was pointed out in a recent post scoping does not work as expected inside of Module. An example from that thread is: Module[{expr}, expr = 2 z; f[z_] = expr; f[7]] (*2 z$1776*) But the following works as almost as expected. Module[{expr}, expr = 2 z; Set@@{f[z_], expr}; f[7]] (*14*) What language design consideration made wolfram choose this functionality?

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• unique substrings using suffix tree

  - by user1708762

  For a given string S of length n- Optimal algorithm for finding all unique substrings of S can't be less than O(n^2). So, the best algorithm will give us the complexity of O(n^2). As per what I have read, this can be implemented by creating suffix tree for S. The suffix tree for S can be created in O(n) time. Now, my question is- How can we use the suffix tree for S to get all the unique substrings of S in O(n^2)?

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• Windows C/Sleep() function during clock drift.

  - by Richard Franks

  If I run something like Sleep(10000), and the system clock changes during that, will the thread still sleep for 10 seconds of wall-clock time, or less or more? I.e. does the Sleep() function convert milliseconds into hardware ticks?

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• What's this setting of MATLAB for(which is causing lots of troubles for lots of people)?

  - by Runner

  This setting in PATH: D:\MATLAB\R2007b\bin\win32 Here is a fresh bad affect by this setting for me: http://stackoverflow.com/questions/2712913/why-does-this-program-require-msvcr80-dll-and-whats-the-best-solution-for-this-k And here's an issue reported by another guy: http://groups.google.com/group/ggobi/browse_thread/thread/dacea0fa93dcaf75 What's that setting for and why it's causing so many problems?

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• which regular expressions do you use the most?

  - by markcial

  I'm starting to learn reg exp and i'm just curious to reg exp used by the rest of the people so i can have a thread to look at and learn from. I had started with the eight listed here, i tried to play a little big with firebug and some tutorials and used some in my websites, but i'd like to know some from more experienced people. Thanks!

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• git best practices for quickly switching between branches

  - by Richard

  I have multiple active branches that I need to work on at the same time. Clearly I can create two working directories with a distinct branch per directory. Is that the only way to do it without having to "commit" and "checkout" in order to switch from one branch to another?

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• Order and group by date in Mysql

  - by Alexd2

  Hi all and thanks in advance. I have a small problem which can not resolve, I have this table, and I want to sort by date and group it (but I only show 1 per idCAT) | id | idcat | name | date | | 1 | 3 | xx | 2011-01-02 | | 2 | 4 | xf | 2011-01-02 | | 3 | 3 | cd | 2011-01-01 | | 4 | 1 | cg | 2011-01-04 | | 5 | 4 | ce | 2011-01-06 | would like to stay that way, try in a way but I can not | 2 | 4 | xf | 2011-01-01 | | 3 | 3 | cd | 2011-01-02 | | 4 | 1 | cg | 2011-01-04 |

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• What is your most useful C/C++ utility?

  - by maddizzyro

  It seems that every project has an "utility" module with various code snippets used throughout other files and which don't fit any particular pattern. What utility classes, functions, and macros do you find most useful in your C/C++ projects? Please keep the entries small (under 100 lines) and give only one example per post.

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• Can the same DLL be called by 2 different processes ?

  - by Jelly Amma

  I have two different C# applications that are running at the same time. I would like both of them to be able to access the same instance of a DLL (also in C#). My DLL is thread-safe so I was hoping this would be possible but I'm not sure how. Any help or advice would be much appreciated.

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• What are the advantages of distributed revision control tool over SVN in small teams?

  - by estourodepilha.com

  If I had: 1 developer per project, and there was only one central repository, and it was in the same LAN as the developers computers, would still a DVCS have any advantage over a centralized (SVN, etc) one? And what about the other advantages of the main DVCSes have over SVN?

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• Destroy object during event called by said object

  - by Pmmlr

  Hello, I have a button. Its OnClick event calls a procedure which destroys the button, but then the "thread" wants to return to the OnClick event and I get an access violation. I'm completely stumped!

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