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• How to detect .NET WPF memory leak or GC long run?

  - by Néstor Sánchez A.

  I have the next very strange situation and problem: .NET 4.0 application for diagram editing (WPF). Runs ok in my PC: 8GM RAM, 3.0GHz, i7 quad-core. While creating objects (mostly diagram nodes and connectors, plus all the undo/redo information) the TaskManager show, as expected, some memory usage "jumps" (up and down). These mem-usage "jumps" also remains executing AFTER user interaction ended. Maybe this is the GC cleaning/regorganizing memory? To see what is going on, I've used the Ants mem profiler, but somewhat it prevents those "jumps" to happen after user interaction. PROBLEM: It Freezes/Hangs after seconds or minutes of usage in some slow/weak laptos/netbooks of my beta testers (under 2GHz of speed and under 2GB of RAM). I was thinking of a memory leak, but... EDIT: Also, there is the case that the memory usage grows and grows until collapse (only in slow machines). In a Windows XP Mode machine (VM in Win 7) with only 512MB of RAM Assigned it works fine without mem-usage "jumps" after user interaction (no GC cleaning?!). So, I really have a big trouble because I cannot reproduce the error, only see these strange behaviour (mem jumps), and the tool supposed to show me what is happening is hiding the problem (like the "observer's paradox"). Any ideas on what's happening and how to solve it?

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• Python library to detect if a file has changed between different runs?

  - by Stefano Borini

  Suppose I have a program A. I run it, and performs some operation starting from a file foo.txt. Now A terminates. New run of A. It checks if the file foo.txt has changed. If the file has changed, A runs its operation again, otherwise, it quits. Does a library function/external library for this exists ? Of course it can be implemented with an md5 + a file/db containing the md5. I want to prevent reinventing the wheel.

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• .NET How to detect if DirectX 10 is supported?

  - by ShdNx

  I would like to find out from .NET code whether DirectX 10 is supported on the machine, preferably without using managed DirectX or XNA assemblies. Thank you in advance!

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• How can a PHP script detect if it has been invoked as a script or from the shell?

  - by George Edison

  I have a PHP script on a webserver. This file is invoked via the shell by another program but it could still be run by the webserver in response to an HTTP request. How can the script determine the way it was invoked?

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• How to detect if breaking an edge will make a graph disjoint?

  - by the_graph_guy

  I have a graph that starts off with a single, root node. Nodes are added one by one to the graph. At node creation time, they have to be linked either to the root node, or to another node, by a single edge. Edges can also be created and deleted (one by one, between any two nodes). Nodes can be deleted one at a time. Node and edge creation, deletion operations can happen in any arbitrary order. OK, so here's my question: When an edge is deleted, is it possible do determine, in constant time (i.e. with an O(1) algorithm), if doing this will divide the graph into two disjoint subgraphs? If it will, then which side of the edge will the root node belong? I'm willing to maintain, within reasonable limits, any additional data structure that can facilitate the derivation of this information. Maybe it is not possible to do it in O(1), if so any pointers to literature will be appreciated.

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• C# 4: how to in-line detect for nulls?

  - by Dr. Zim

  In C# 4, wasn't there a short cut for checking for null values like so: if( myobject?.myproperty?.myotherproperty?.value != null ) The value would return null and not throw an exception. Anyone have a link to how to use it or at least the syntax?

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• LINUX: how to detect that ftp file upload is finished.

  - by duke84

  In my project I have a file uploading feature. Files are uploaded via FTP. I need to configure a listener that will check for new files and invoke a script only when file uploading is finished. Because if I run this script immediately after detecting the new file, it can start to process file that is not completely uploaded, which will cause an error. Can anybody tell if this is possible on LINUX and how can I do this?

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• How can a client gracefully detect when a server disconnects?

  - by Ummar

  I am working on a client-server application. The client continuously reads data from server, so when a server is closed or disconnects then the client crashes. I tried a try/catch block, but it didn't work. My client application is written in C++. I want the client to display some proper message like "Server disconnected," then exit.

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• FLEX: how can I detect visual collisions between objects ?

  - by Patrick

  Hi, I would like to avoid the tags overlapping each other in this small Flex project: I've this small FLEX project: http://dl.dropbox.com/u/72686/IVbeta1/main.html# The items are LinkButtons. How can I check if they are colliding or not ? Thanks

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• How to detect first or last element iterating over a container?

  - by Basilevs

  How to do the following in more stylish/short way? for(i=container.begin(); i!=container.end(); ++i) { if (i!=container.begin()) { cout << ", "; } cout << *i; if (i==container.end()) { cout << "!" << endl; } } Solutions like foreach are acceptable (actions on first and last elements need to be configurable, though).

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• iPhone WebApps, is there a way to detect how it was loaded? Home Screen vs Safari?

  - by nobosh

  I have an iPhone Web App. I'm interested in detecting if the app was loaded either from: 1. iPhone Safari 2. iPhone installed web app (via the add to my homescreen) which loads without the safari bars. Any ideas?

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• is there any way to detect whether the javascript is enabled or disabled via c-sharp code?

  - by Mac

  while using jquery for developing site if javascript is not enabled then what to do

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• How to programmatically detect if an device has been jailbreaked?

  - by mystify

  Maybe there's something different in jailbreaked devices which could be checked programmatically?

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• Is there a way to detect inactive time of a user in a website? (Idle time)

  - by masoud ramezani

  This is my approach : I reserve last time that a user post a postback to server in a session and in every postback subtract this value from current value. Is there a better way for this? I think that my approach haven't a good performance.

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• C# Anyway to detect if an object is locked.

  - by scope-creep

  Hi, Is their anyway to determine if a object is locked in c#. I have the unenviable position, through design where i'm reading from a queue inside a class, and I need to dump the contents into a collection in the class. But that collection is also read/write from an interface outside the class. So obviously their may be a case when the collection is being written to, as the same time i want to write to it. I could program round it, say using delegate but it would be ugly. Bob.

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• How to detect what Library is behind the $ function?

  - by clops

  I am developing some JavaScript that should work with either Prototype.js or JQuery, thus I need some way to identify what is the primary library in use. How can I do that?

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• Android, how to detect if somebody has touched\moved my device.

  - by systempuntoout

  Is it possible to know if someone has touched my phone (lifting or moving it for example), using some Events? How would you code it?

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• is vim able to detect in which language a file is written, and then load the correct dictionnary ?

  - by Niels

  I am using several languages, and by now I am obliged to indicate vim with which of these the spell check must be done. Is there a way to set up vim so that he automatically detects the correct one ? I remember vaguely that in a previous version of vim, when the spell check was not integrated, this was possible, using the vimspell script. It would be even better if this could apply not only to a file but also to a portion of a file, since I frequently mix several languages in a single file. Of course, I would like to avoid to load several dictionaries simultaneously.

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• Is there an event to detect URL change inside an iframe?

  - by seatoskyhk

  Let say, I have an iframe like that: and in test.html, there is a button that will change its url to ...let say google.com so, is there any way that the iframe knows there is a change in the src? e.g. onchange or onload.. or whatever.

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• How do I detect what software is using the webcam on a Windows box (XP,Vista,7)

  - by burnt_hand

  The idea is that I want to build a small app that detects if the webcam is being used and by what. I have thought about seeing who has use of the Twain.dll somehow (like the way process explorer knows) It's for a security style app that picks out weird webcam behaviour. Ideally I would use C# as it's my strong point, but I'm guessing it won't be that nice.

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• How to detect the MAC address of the user viewing our website using PHP?

  - by Starx

  I know how to track down an IP address, but I need to track down the MAC address of the users viewing my page. How to accomplish this?

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• How to detect that C# winform code is executed within Visual Studio ?

  - by user284523

  Is there a variable or a preprocessor constant that allows to know that the code is executed within the context of VS Studio ?

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• How to detect mobile and tablet using CSS or JavaScript regardless of brands?

  - by user144966

  Basically what I'm trying to do is have 3 css stylesheets for desktop, mobile, and tablet. And I don't care if it is ipad or samsung galaxy tab as long as I know it is a tablet, so that I just apply tablet css to it. Same as iphone or Nexus which I don't care either. I just care about the dimension basically. That would be good if JQuery Mobile could do this. I know there is lots of code for detecting iphone, ipad, and etc, hope my post still makes sense. Thanks.

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• How to detect if a Window handle belongs to a VCL or not?

  - by Edwin

  Hi, I'm writing a Office addin, and I need to reliably determine if win32 window handle is a handle of a VCL (a control or a form, whatsoever) of my Addin, or it's handle of any windows of Microsoft Office itself? Thank you!

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• What is the most efficient way to detect if a string contains a number of consecutive duplicate char

  - by silent

  For example, a user entered "I love this post!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" the consecutive duplicate exclamation mark "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" should be detected.

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