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  • Parallel programming in C#

    - by Alxandr
    I'm interested in learning about parallel programming in C#.NET (not like everything there is to know, but the basics and maybe some good-practices), therefore I've decided to reprogram an old program of mine which is called ImageSyncer. ImageSyncer is a really simple program, all it does is to scan trough a folder and find all files ending with .jpg, then it calculates the new position of the files based on the date they were taken (parsing of xif-data, or whatever it's called). After a location has been generated the program checks for any existing files at that location, and if one exist it looks at the last write-time of both the file to copy, and the file "in its way". If those are equal the file is skipped. If not a md5 checksum of both files is created and matched. If there is no match the file to be copied is given a new location to be copied to (for instance, if it was to be copied to "C:\test.jpg" it's copied to "C:\test(1).jpg" instead). The result of this operation is populated into a queue of a struct-type that contains two strings, the original file and the position to copy it to. Then that queue is iterated over untill it is empty and the files are copied. In other words there are 4 operations: 1. Scan directory for jpegs 2. Parse files for xif and generate copy-location 3. Check for file existence and if needed generate new path 4. Copy files And so I want to rewrite this program to make it paralell and be able to perform several of the operations at the same time, and I was wondering what the best way to achieve that would be. I've came up with two different models I can think of, but neither one of them might be any good at all. The first one is to parallelize the 4 steps of the old program, so that when step one is to be executed it's done on several threads, and when the entire of step 1 is finished step 2 is began. The other one (which I find more interesting because I have no idea of how to do that) is to create a sort of worker and consumer model, so when a thread is finished with step 1 another one takes over and performs step 2 at that object (or something like that). But as said, I don't know if any of these are any good solutions. Also, I don't know much about parallel programming at all. I know how to make a thread, and how to make it perform a function taking in an object as its only parameter, and I've also used the BackgroundWorker-class on one occasion, but I'm not that familiar with any of them. Any input would be appreciated.

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  • Clamping a vector to a minimum and maximum?

    - by user146780
    I came accross this: t = Clamp(t/d, 0, 1) but I'm not sure how to perform this operation on a vector. What are the steps to clamp a vector if one was writing their own vector implementation? Thanks clamp clamping a vector to a minimum and a maximum ex: pc = # the point you are coloring now p0 = # start point p1 = # end point v = p1 - p0 d = Length(v) v = Normalize(v) # or Scale(v, 1/d) v0 = pc - p0 t = Dot(v0, v) t = Clamp(t/d, 0, 1) color = (start_color * t) + (end_color * (1 - t))

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  • Android Twitter Application Development and Usage of TextView and Linkify

    - by y ramesh rao
    I'm on developing a twitter kind of Application where in I want that the user would be displayed the timelines and the Textview in the Lists require to perform clicks on (http://)URLs, (@)usernames, and (#)hasTags and I want to invoke custom methods over these actions, I have used the Linkify class and the actions but where of no use because the customization that i require cannot be incorporated.

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  • replacing Fragment inside onActivityResult() geting error

    - by ajay
    When am lancing camera using Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent, CAMERA_REQUEST);) And then we getting callback after taking pic to the onActivityResult(){ //HERE AM CALL ING ANOTHER FRAGMENT FragmentManager fm = getFragmentManager(); fm.beginTransaction().replace( R.id.tab_upload, new uploadingActivty(), "tabId").setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN) .addToBackStack(null).commit(); } Then we getting error as 11-21 16:13:44.316: E/AndroidRuntime(30944): Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState Any idea?

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  • Where is svn.exe in my machine?

    - by Amitabh
    I have Tortoise svn installed on my desktop. I want to perform some tasks using commandline svn.exe? But I am not able to find svn.exe on my machine. Do we have to install something else to get the svn.exe command?

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  • XSL Grouping Problem

    - by Wail
    I have the following xml and I an trying to perform the following 1- Group By the first Field where id="1923" if the value attribute is the same 2- and average all the fields with id="3095" using the value attribute 3- and average all the fields with id="3095" using the value attribute Trying to produce the following: Test 1 5.33 5.33 Test 2 3 4 Test 3 4 4

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  • How can I create a Base64-Encoded string from an GDI+ Image in C++?

    - by Schnapple
    I asked a question recently, How can I create an Image in GDI+ from a Base64-Encoded string in C++?, which got a response that led me to the answer. Now I need to do the opposite - I have an Image in GDI+ whose image data I need to turn into a Base64-Encoded string. Due to its nature, it's not straightforward. The crux of the issue is that an Image in GDI+ can save out its data to either a file or an IStream*. I don't want to save to a file, so I need to use the resulting stream. Problem is, this is where my knowledge breaks down. This first part is what I figured out in the other question // Initialize GDI+. GdiplusStartupInput gdiplusStartupInput; ULONG_PTR gdiplusToken; GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL); // I have this decode function from elsewhere std::string decodedImage = base64_decode(Base64EncodedImage); // Allocate the space for the stream DWORD imageSize = decodedImage.length(); HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE, imageSize); LPVOID pImage = ::GlobalLock(hMem); memcpy(pImage, decodedImage.c_str(), imageSize); // Create the stream IStream* pStream = NULL; ::CreateStreamOnHGlobal(hMem, FALSE, &pStream); // Create the image from the stream Image image(pStream); // Cleanup pStream->Release(); GlobalUnlock(hMem); GlobalFree(hMem); (Base64 code) And now I'm going to perform an operation on the resulting image, in this case rotating it, and now I want the Base64-equivalent string when I'm done. // Perform operation (rotate) image.RotateFlip(Gdiplus::Rotate180FlipNone); IStream* oStream = NULL; CLSID tiffClsid; GetEncoderClsid(L"image/tiff", &tiffClsid); // Function defined elsewhere image.Save(oStream, &tiffClsid); // And here's where I'm stumped. (GetEncoderClsid) So what I wind up with at the end is an IStream* object. But here's where both my knowledge and Google break down for me. IStream shouldn't be an object itself, it's an interface for other types of streams. I'd go down the road from getting string-Image in reverse, but I don't know how to determine the size of the stream, which appears to be key to that route. How can I go from an IStream* to a string (which I will then Base64-Encode)? Or is there a much better way to go from a GDI+ Image to a string?

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  • NHibernate + Sql Compact + IoC - Connection Managment

    - by Michael
    When working with NHibernate and Sql Compact in a Windows Form application I am wondering what is the best practice for managing connections. With SQL CE I have read that you should keep your connection open vs closing it as one would typically do with standard SQL. If that is the case and your using a IoC, would you make your repositories lifetime be singletons so they exist forever or dispose of them after you perform a "Unit of Work". Also is there a way to determine the number of connections open to Sql CE?

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  • Is transmitted bytes event exist in Linux kernel?

    - by alnet
    I need to write a rate limiter, that will perform some stuff each time X bytes were transmitted. The straightforward is to check the length of each transmitted packet, but I think it will be to slow for me. Is there a way to use some king of network event, that will be triggered by transmitted packets/bytes?

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  • how to design this relation in a DB schema

    - by raticulin
    I have a table Car in my db, one of the columns is purchaseDate. I want to be able to tag every car with a number of Policies (limited to 10 policies). Each policy has a time to life (ttl, a duration of time, like '5 years', '10 months' etc), that is, for how long since the car's purchaseDate the policy can be applied. I need to perform the following actions: when inserting a Car, it will be set with a number of Policies (at least one is set) sometimes a Car will be updated to add/remove a Policy searches must be done taking into account date/policies, for example: 'select all cars that are not covered by any policy as of today' My current design is (pol0..pol9 are the policies): CREATE TABLE Car ( id int NOT NULL IDENTITY(1,1), purchaseDate datetime NOT NULL, //more stuff... pol0 smallint default NULL, pol1 smallint default NULL, pol2 smallint default NULL, pol3 smallint default NULL, pol4 smallint default NULL, pol5 smallint default NULL, pol6 smallint default NULL, pol7 smallint default NULL, pol8 smallint default NULL, pol9 smallint default NULL, PRIMARY KEY (id) ) CREATE TABLE Policy ( id smallint NOT NULL, name varchar(50) collate Latin1_General_BIN NOT NULL, ttl varchar(100) collate Latin1_General_BIN NOT NULL, PRIMARY KEY (id) ) The problem I am facing is that the sql to perform the query above is a nightmare to write. As I don't know in which column each policy can be, so I have to check all columns for every policy etc etc. So I am wondering wether it is worth changing this. My questions are: The smallint as Policy id was chosen instead of an 'int IDENTITY' in order to save some space as there are going to be millions of Car records. It just adds complexity when creating a Policy as we must handle the id etc. Was it worth doing this? I am thinking that maybe there is a much better design? Obviously we could move the policy/car relation to its own table CarPolicy, benefits would be: no limit on 10 policies per car adding/removing etc much easier when only the default policy is applied (when no others are applied one called Default policy is applied), we could signal that by not having any entry in CarPolicy, now this is just done inserting the Default policy id in one of the columns. The cons are that we would need to change the DB, ORM classes etc. What would you recommend? Maybe there is another smart way to implement this that we are not aware without using the CarPolicy table?

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  • Get tweets of a public twitter profile

    - by Denzil
    Hi folks, I have a list of usernames on Twitter whose profiles are public. I wish to get "all the tweets" they have posted from the day they formed their profile. I checked Twitter4J examples http://github.com/yusuke/twitter4j/blob/master/twitter4j-examples/src/main/java/twitter4j/examples/GetTimelines.java . According to the Twitter API documentation, only the 20 most recent tweets are returned. Is there anyway I could perform my task?

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  • Filter entire NSDictionaries out of NSArray based on multiple keys

    - by user270475
    Hi, I have an NSArray of NSDictionary objects which I would like to be able to return a new array of NSDictionaries from, where every NSDictionary has "Area == North" (for example). The closest example I have found so far is http://stackoverflow.com/questions/958622/using-nspredicate-to-filter-an-nsarray-based-on-nsdictionary-keys but this just returns the unique values for a given key, not the dictionary that has that key. Is there any way to perform a similar operation, and to return the entire dictionary?

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  • Multithreading consulting service

    - by Gustavo Paulillo
    Hello. I am creating a service, that needs to perform the following tasks: consult bank services and persist data into DB. The dificult is: Its needed to execute each process in parallel. I mean the better choice is implementing a multithreading service, running each instance per thread. But how its done? Thanks

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  • Select...Case VB.NET to C# Equivalent

    - by Alex Essilfie
    I just started using C# and I've got a couple of issues. I hook several controls to one event handler as in the following and I want to perform a slightly different action for each control: Private Sub Button_Click(sender as Object, e as EventArgs) _ Handles button1.Click, Button2.Click 'do a general activity Select CType(sender, Button).Name Case button1.Name 'do something Case button2.Name 'do something else Case Else 'do the defalut action End Select End Sub Is there any way of doing the above select statement in C# without having to use nested ifs?

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  • Best way to do text processing in linux/mac ?

    - by euphoria83
    I generally need to do a fair amount of text processing for my research, such as removing the last token from all lines, extracting the first 2 tokens from each line, splitting each line into tokens, etc. What is the best way to perform this ? Should I learn Perl for this? Or should I learn some kind of shell commands? The main concern is speed. If I need to write long code for such stuff, it defeats the purpose.

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  • copy and Search Web services

    - by user171523
    We are in the process of integrating ASP.NET Business App with Sharepoint. I have some Design questions. Requirement - From ASP.NET buz application we upload document to Sharepoint Doc Lib 2010 using Web Services. And perform a Search using Serach web service. I would like to know from group are there any disadvantages doing this? Performance etc .. What kind of seacurity consideration i need to be thinking of.

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  • PHP app\console wont work trying to create bundle for Symfony2

    - by user3461632
    I have installed Symfony2 on a iis 7 server with PHP 5.3.21 and everything works ok ( the php, the symphony demo page ). I try to create my own helloWorld, as the tutorial says : php app/console generate:bundle I go Start-Run-CMD and put that line of code and it gives me back this : could not open input file : app/console and before anyone asks i am in the project directory when i perform this command I put the PHP directory to the System PATH but the problem persists.

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  • mysqli_stmt_bind_param SQL Injection

    - by profitphp
    Is there still an injection risk when using prepared statements and mysqli_stmt_bind_param? For example: $malicious_input = 'bob"; drop table users'; mysqli_stmt_bind_param($stmt, 's', $malicious_input); Behind the scenes does mysqli_stmt_bind_param pass this query string to mysql: SET @username = "bob"; drop table users"; Or does it perform the SET command through the API, or use some type of protection to keep this from happening?

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  • Question on Binary Search Trees.

    - by AGeek
    Hi, I was thinking of implementing a binary search trees. I have implemented some very basic operations such as search, insert, delete. Please share your experiences as to what all other operations i could perform on binary search trees, and some real time operations(basic) that is needed every time for any given situation.. I hope my question was clear.. Thanks.

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  • DDEPoke From Browser

    - by Steven Hardman
    I have a legacy application that I'm trying to interact with from a browser. The only supported method from the application vendor is by using a DDEPoke request. I'm having difficulty figuring out a simple way to perform such a request from a browser. I am open to any particular technology, be it javascript, a browser plugin, ActiveX/Java Applet, etc - the simpler the solution the better. Does anyone have a simple solution for this?

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