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  • Speed of interpolation algorithms, C# and C++ working together.

    - by Kaminari
    Hello. I need fast implementation of popular interpolation algorithms. I figured it out that C# in such simple algorithms will be much slower than C++ so i think of writing some native code and using it in my C# GUI. First of all i run some tests and few operations on 1024x1024x3 matrix took 32ms in C# and 4ms in C++ and that's what i basicly need. Interpolation however is not a good word because i need them only for downscaling. But the question is: Will it be faster than C# methods in Drawing2D Image outputImage = new Bitmap(destWidth, destHeight, PixelFormat.Format24bppRgb); Graphics grPhoto = Graphics.FromImage(outputImage); grPhoto.InterpolationMode = InterpolationMode.*; //all of them grPhoto.DrawImage(bmp, new Rectangle(0, 0, destWidth, destHeight), Rectangle(0, 0, sourceWidth, sourceHeight), GraphicsUnit.Pixel); grPhoto.Dispose(); Some of these method run in 20ms and some in 80. Is there a way to do it faster?

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  • How to implement a set ?

    - by nomemory
    I want to implement a Set in C. Is it OK to use a linked list, when creating the SET, or should I use another approach ? How do you usually implement your own set (if needed). NOTE: If I use the Linked List approach, I will probably have the following complexities for my operations: init : O(1); destroy: O(n); insert: O(n); remove: O(n); union: O(n*m); intersection: O(n*m); difference: O(n*m); ismember: O(n); issubset: O(n*m); setisequal: O(n*m); O(n*m) seems may be a little to big especially for huge data... Is there a way to implement my Set more efficient ?

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  • ASP.NET check if LinqToEntities returned something or not.

    - by Alex
    How to make this method return boolean value, depending on query return. False - nothing, True - data exists. Before i just returned int from uniqueQuote.Count() but does not look like great method. Thank you! private bool CheckEnquiryUser(int enquiryId, Guid userId) { int selectedEnquiryId = enquiryId; Guid currentUserId = userId; Entities ctx3 = new Entities(); var uniqueQuote = from quot in ctx3.Enquiries.Include("aspnet_Users") where quot.EnquiryId == selectedEnquiryId && quot.aspnet_Users.UserId == currentUserId select quot; bool exist = uniqueQuote; return exist;

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  • How online-game clients are able to exchange data through internet so fast?

    - by Kirzilla
    Hello, Let's imagine really simple game... We have a labirinth and two players trying to find out exit in real time through internet. On every move game client should send player's coordinates to server and accept current coordinates of another client. How is it possible to make this exchange so fast (as all modern games do). Ok, we can use memcache or similar technology to reduce data mining operations on server side. We can also use fastest webserver etc., but we still will have problems with timings. So, the questions are... What protocol game clients are usually using for exchanging information with server? What server technologies are coming to solve this problem? What algorithms are applied for fighting with delays during game etc. PS: Sorry for my English and I hope that my question is clear. Thank you.

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  • How to leave out some System.out/logging statements while executing java code?

    - by iamrohitbanga
    In C++ if we do not want some statements to compile into code that ships like assert function calls, we control their compilation through #ifndef preprocessor directives. How do we do this in Java? I have some System.out.println() statements for debugging which I would like to remove for the final code. one way is to make them execute conditionally under the affect of a boolean variable. Is there a better way of doing this? As I have a java swing application I can turn off the System.out.println statements without affecting the output. What is the method of doing this?

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  • sortable + draggable demo - how to get access to dropped item?

    - by user246114
    Hi, I have a sortable list. When a new item is dropped into the list (from a draggable), I'd like to get access to it to perform some operations on it. This is what I have: $("#mySortableList").sortable({ receive: function(event, ui) { alert("this is the dropped item: " + ui.item.toString()); } }).disableSelection(); so "ui.item" is the element that was dropped, but it's not the duplicated item that will now be part of my list. How do I get access to the new item that was dropped? I am using the exact demo from the jquery-ui site here: http://jqueryui.com/demos/draggable/#sortable Thanks

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  • Sql Server 2000 Stored Procedure Prevents Parallelism or something?

    - by user187305
    I have a huge disgusting stored procedure that wasn't slow a couple months ago, but now is. I barely know what this thing does and I am in no way interested in rewriting it. I do know that if I take the body of the stored procedure and then declare/set the values of the parameters and run it in query analyzer that it runs more than 20x faster. From the internet, I've read that this is probably due to a bad cached query plan. So, I've tried running the sp with "WITH RECOMPILE" after the EXEC and I've also tried putting the "WITH RECOMPLE" inside the sp, but neither of those helped even a little bit. When I look at the execution plan of the sp vs the query, the biggest difference is that the sp has "Parallelism" operations all over the place and the query doesn't have any. Can this be the cause of the difference in speeds? Thank you, any ideas would be great... I'm stuck.

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  • struts annotation issue

    - by Gourav
    My issue is that i have an annotation in Struts2 action class like private String[] origfilenofrom; @FieldExpressionValidator(fieldName="origfilenofrom",key="",message="File Length should be 12 for old file format and 15 for new file format",expression="checkorigFileFormat(origfilenofrom)") now my mehtod is public boolean checkorigFileFormat(String[] files ) { for(int counter=0;counter<files.length;counter++) { int n=files[counter].length(); if(!(n==12 || n==15)) { return false; } } return true; } So for any string in that string [], which is returning false the value is bei false. No matter 3 strings in that string [] are true if one is false then the annotaion message is displayed for all. I want the message not to display where the string is true. Help please

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  • Is it possible to create a Service that listens for hardware key presses?

    - by VoteBrian
    I'd like to run an Android background service that will act as a keylistener from the home screen or when the phone is asleep. Is this possible? From semi-related examples online, I put together the following service, but get the error, "onKeyDown is undefined for the type Service" public class ServiceName extends Service { @Override public void onCreate() { //Stuff } public IBinder onBind(Intent intent) { //Stuff return null; } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(event.getAction() == KeyEvent.ACTION_DOWN) { switch(keyCode) { case KeyEvent.KEYCODE_A: //Stuff return true; case KeyEvent.KEYCODE_B: //Stuff return true; //etc. } } return super.onKeyDown(keyCode, event); } } I realize Android defaults to the search bar when you type from the home screen, but this really is just for a very particular use. I don't really expect to distribute this. Also, it'd be nice to use the camera button to wake the phone.

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  • How to group rows into two groups in sql?

    - by user1055638
    Lets say I have such a table: id|time|operation 1 2 read 2 5 write 3 3 read 4 7 read 5 2 save 6 1 open and now I would like to do two things: Divide all these records into two groups: 1) all rows where operation equals to "read" 2) all other rows. Sum the time in each group. So that my query would result only into two rows. What I got so far is: select sum(time) as total_time, operation group by operation ; Although that gives me many groups, depending on the number of distinct operations. How I could group them only into two categories? Cheers!

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  • how do you set a property of a control to an address of a function in xaml?

    - by ambog36
    Hi, I have a control that has a "Filter" property that expects a function that defines how the contents of the control should be filtered. so far i am setting the filter in code behind as such: MyControl.Filter = AddressOf Filters.MyFilter In this example MyFilter is a shared function in the Filters class with the following signature: Public Shared Function MyFilter(ByVal obj As Object, ByVal text As String) As Boolean I would like to set this in xaml. I was thinking of setting the Filters.MyFilter as a static resource and setting it that way: ...Filter="{StaticResource myFilter}"/ but i cant set Filters.MyFilter as a static resource. Any ideas on how to achieve this? Thanks,

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  • Detecting metadata-only read requests in windows filesystem

    - by HyLian
    Hello, I'm developing a kind of filesystem driver. All of read requests that windows makes to my filesystem goes by the driver implementation. I would like to distinguish between "normal" read requests and those who want to get only the metadata from the file. ( Windows reads first 4K of the file and then stop reading ). Does Windows mark this metadata reads in some way? It would be very useful in order to treat that two kind of operations in a different way. In a typical CreateFile call, we have AccessMode, ShareMode, CreationDisposition and FlagsAndAttributes parameters ( being DWORD ), i'm not sure if it's possible to extract some clue of the operation requested. Thanks for reading :)

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  • Android FTP seek Bar issue

    - by Androi Developer
    I am trying to Upload & Download file to server using FTP and Download File using HTTP i am able to do this, my problem is when i am trying to show seek bar with Upload status of file using ftp then it's not showing. In this attached image Using HTTP it's showing seekbar with Network spped like this i need to display seek bar & Network sppeed in FTP. Below code i wrote for FTP to upload file into server. Code:-- // Upload System.out.println("upload test is called"); //Toast.makeText(con, "upload FTP test is called", Toast.LENGTH_SHORT).show(); //ContextWrapper context = null; //assetManager= context.getAssets(); assetManager = getResources().getAssets(); input1 = assetManager.open("hello.txt"); final long started = System.currentTimeMillis(); int size = input1.available(); //byte[] buffer = new byte[size]; byte dataByte[] = new byte[1024]; //input1.read(buffer); //String data = "ZK DATA TESTER TEST DATA1sdfsdf"; String data = input1.toString(); System.out.println("dat value is........"+data); final int lenghtOfFile = data.getBytes().length; //final int lenghtOfFile = input1.getBytes().length; System.out.println("length of file....."+lenghtOfFile); ByteArrayInputStream in = new ByteArrayInputStream( data.getBytes()); //toast("Uploading /test.txt"); //Toast.makeText(con,"File Size : " +data.getBytes().length + " bytes",Toast.LENGTH_SHORT).show(); //byte b[] = new byte[1024]; long total = 0; long sleepingTime= 0; System.out.println("started time --"+started); updateUI(status, "Uploading"); while ((count = in.read(dataByte)) != -1) { System.out.println("read value is...."+in.read(dataByte)); while (sleep1) { Thread.sleep(1000); System.out.println("ftp upload is in sleeping mode"); sleepingTime +=1000; } System.out.println("Total count --"+count); total += count; System.out.println("Only Total --"+total); final int progress = (int) ((total * 100) / lenghtOfFile); final long speed = total; //duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; boolean result = ObjFtpCon.storeFile("/test.txt", input1); //boolean result = ObjFtpCon.storeFile(map.get("file_address").toString()+"/test.txt", input1); duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; /* runOnUiThread(new Runnable() { public void run() { bar.setProgress(progress); // trans.setText("" + progress); //duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; //duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; //real_time.setText(duration + " secs"); if (duration != 0) { test_avg.setText((((speed / duration)*1000)*0.0078125) + " kbps"); if (pk <= (speed / duration) / 1024) { pk = (speed / duration) / 1024; } if (pk <= ((speed / duration)*1000)*0.0078125) { pk = (long)(((speed / duration)*1000)*0.0078125); } //peak.setText(pk + " kbps"); } } });*/ //in.close(); if (result) { updateUI(status, "Uploaded"); // toast("Uploading succeeded"); // toast("Uploaded at /test.txt"); //duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; System.out.println("curreent time..... "+System.currentTimeMillis()); System.out.println("started time --"+started); System.out.println("sleep tome...."+sleepingTime); System.out.println("duration is....."+duration); runOnUiThread(new Runnable() { public void run() { bar.setProgress(progress); // trans.setText("" + progress); //duration = ((System.currentTimeMillis() - started)-sleepingTime) / 1000; real_time.setText(duration + " secs"); if (duration != 0) { test_avg.setText((speed / duration) / 1024 + " kbps"); if (pk <= (speed / duration) / 1024) { pk = (speed / duration) / 1024; } peak.setText(pk + " kbps"); } } }); } /*while(!result){Thread.sleep(1000);}*/ } in.close();

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  • finding character in string C language

    - by iSight
    Hi, I am searching a character at first occurence in string using the following code. But, it is taking some time when the character is too long or the character that i am searching is at far extend, which makes delay in other operations. How could i tackle with this problem. The code is below here. Note: attrPtr is a char* which holds a reference to a string containing '"' character at far extend. int position = 0; char qolon = '"';//character to search while (*(attrPtr + position++) != qolon); char* attrValue = NULL; attrValue = (char*)malloc(position * sizeof(char)); strncpy(attrValue, attrPtr, position-1);

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  • When is a program limited by the memory bandwidth?

    - by hanno
    I want to know if a program that I am using and which requires a lot of memory is limited by the memory bandwidth. When do you expect this to happen? Did it ever happen to you in a real life scenario? I found several articles discussing this issue, including http://www.cs.virginia.edu/~mccalpin/papers/bandwidth/node12.html http://www.cs.virginia.edu/~mccalpin/papers/bandwidth/node13.html http://ispass.org/ucas5/session2_3_ibm.pdf The first link is a bit old, but suggests that you need to perform less than about 1-40 floating point operations per floating point variable in order to see this effect (correct me if I'm wrong). How can I measure the memory bandwidth that a given program is using and how do I measure the (peak) bandwidth that my system can offer? I don't want to discuss any complicated cache issues here. I'm only interested in the communication between the CPU and the memory.

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  • Is there a way to set a DLL to always follow CultureInfo.InvariantCulture by default, if not specifi

    - by JL
    I have a lot of code in a class library that does not specify CultureInfo.InvariantCulture. For example in toString operations, toBool, toInt, etc. Is there a way I can get set a property for the class library to always execute using CultureInfo.InvariantCulture, even if it is not explicitly specified everywhere in the code? Sort of like a global switch? It is not only messy to have to explicitly type it everytime, it makes my code less readable, and is a royal pain for example: if (Convert.ToInt16(task.RetryCount, CultureInfo.InvariantCulture) < Convert.ToInt16(ConfigurationManager.AppSettings["TasksMaxRetry"], CultureInfo.InvariantCulture))

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  • SSRS run SQL/DataSet conditionally

    - by MikeTWebb
    Hello.... I have an SSRS report that contains several subreports. The user has the ability to select/deselect which subreports they want to produce using several Boolean parameters. If a subreport is deselected then it is not rendered by setting the Visibility property. However, the DataSet associated with the de-selected subreport still executes causing the execution time to take longer than expected. Is there any way to tell a dataset on a subreport or Tablix not to execute based on a Parameter selection? Thanks

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  • Why is Hibernate not loading a column?

    - by B.R.
    I've got an entity with a few properties that gets used a lot in my Hibernate/GWT app. For the most part, everything works fine, but Hibernate refuses to load one of the properties. It doesn't appear in the query, despite being annotated correctly in the entity. The relevant portion of the entity: @Column(name="HasSubSlots") @Type(type="yes_no") public boolean hasSubSlotSupport() { return hasSubSlotSupport; } And the generated SQL query: Hibernate: /* load entities.DeviceModel */ select devicemode0_.DevModel as DevModel1_0_, devicemode0_.InvModelName as InvModel2_1_0_ from DeviceModels devicemode0_ where devicemode0_.DevModel=? Despite the fact that I refer to that property, it's never loaded, lazily or not, and the getter always returns false. Any ideas on how I can dig deeper into this, or what might be wrong?

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  • Key Events in TabActivities?

    - by stormin986
    I have a TabActivity and want to catch and handle presses of HOME and BACK. Where do I need to catch these events? In my subclass of TabActivity I implement the following: @Override public boolean onKeyDown(int keyCode, KeyEvent event) { switch (keyCode) { // Code handling } return super.onKeyDown(keyCode, event); } Didn't work. So I placed a breakpoint on the switch statement line. But this function never gets called, whether I press volume up/down, menu, home, or back. Where do I need to catch these KeyEvents?

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  • Event(s) for opening the workbook AND worksheets

    - by KeyMs92
    I'm looking for an elegant solution to trigger an event for opening the workbook as well as opening different worksheets. I don't need seperate operations for each worksheet: they all trigger the same method. I know I can use the events Workbook_Activate / Workbook_Open and Workbook_SheetActivate at the same time but I don't know if this is 'the official way' to do it. Perhaps there's a way to do this with one event. I was also wondering if it is relevant in this matter where I put the code. I now have all the code inside "ThisWorkbook" and not in a "Module"...

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  • which type is best for three radiobuttons?

    - by Manog
    Maybe you consider this question trivial but im just curious what is your opinion. I have three radiobuttons. "Show blue", "Show red" and "Show all". I did it with nullable boolean. There is collumn in database where blue is 0 and red is 1 so in metode i have to translate bool to int to compare those values (i do it in c#).Of course it works, but i wonder if it is the best solution. And question is wich type is best in this case? nullable bool, int, or maybe string?

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  • how to redirect on youtube in androi

    - by rajshree
    public class MovieDescription extends Activity { Vibrator vibrator; TextView tv_title,tv_year,tv_banner,tv_desc; RatingBar ratingBar; ImageView iv_watch,iv_poster; private static final String TAG_CONTACTS = "Demo"; private static final String TAG_ID = "id"; private static final String TAG_TITLE = "title"; private static final String TAG_YEAR = "year"; private static final String TAG_RATING = "rating"; private static final String TAG_BANNER= "category"; private static final String TAG_DESC = "description"; private static final String TAG_URL = "url"; private static final String TAG_POSTER = "poster"; String id,title,year,rating,banner,description,poster, movieUrl; static JSONArray contacts = null; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.movie_description); initialize(); String movieDescUrl = "http://vaibhavtech.com/work/android/movie_description.php?id="+MainActivity.movie_Id; MovieDescriptionParser jParser = new MovieDescriptionParser(); JSONObject json = jParser.getJSONFromUrl(movieDescUrl); try { contacts = json.getJSONArray(TAG_CONTACTS); for (int i = 0; i < contacts.length(); i++) { /**********************************Value Parse FromUrl**********************************/ JSONObject c = contacts.getJSONObject(i); id = c.getString(TAG_ID); title = c.getString(TAG_TITLE); year = c.getString(TAG_YEAR); rating = c.getString(TAG_RATING); banner=c.getString(TAG_BANNER); description = c.getString(TAG_DESC); movieUrl = c.getString(TAG_URL); poster = c.getString(TAG_POSTER); /**********************************Valeu Assing to UI Component**********************************/ Log.i(id, title); } } catch (JSONException e) { e.printStackTrace(); } tv_title.setText(title); tv_year.setText(year); tv_banner.setText(banner); tv_desc.setText(description); Float rat=Float.parseFloat(rating); ratingBar.setRating(rat); Bitmap bimage= getBitmapFromURL("http://vaibhavtech.com/work/android/admin/upload/"+poster); iv_poster.setImageBitmap(bimage); iv_watch.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub vibrator.vibrate(40); LayoutInflater inflater=getLayoutInflater(); View view=inflater.inflate(R.layout.customtoast,(ViewGroup)findViewById(R.id.custom_toast_layout)); Toast toast=new Toast(getApplicationContext()); toast.setDuration(Toast.LENGTH_LONG); toast.setGravity(Gravity.CENTER_HORIZONTAL, 0, 0); toast.setView(view); toast.show(); Intent intent=new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(movieUrl)); startActivity(intent); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub int currentapiVersion = android.os.Build.VERSION.SDK_INT; Log.i("Device Versoin is", ""+currentapiVersion); if (currentapiVersion >= android.os.Build.VERSION_CODES.JELLY_BEAN){ ActionBar actionBar = getActionBar(); actionBar.setHomeButtonEnabled(true); actionBar.setDisplayHomeAsUpEnabled(true); getMenuInflater().inflate(R.menu.main, menu); } return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch (item.getItemId()) { case android.R.id.home: onBackPressed(); return true; case R.id.home: Intent intent = new Intent(this, MainActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); Log.i("Home", "Press"); return true; } return super.onOptionsItemSelected(item); } public void initialize() { tv_banner=(TextView) findViewById(R.id.tv_movie_description_banner); tv_desc=(TextView) findViewById(R.id.tv_movie_description_decription); tv_title=(TextView) findViewById(R.id.tv_movie_description_name); tv_year=(TextView) findViewById(R.id.tv_movie_description_year); ratingBar=(RatingBar) findViewById(R.id.ratingBar1); iv_watch=(ImageView) findViewById(R.id.iv_movie_description_watch); iv_poster=(ImageView) findViewById(R.id.iv_movie_description_poster); vibrator=(Vibrator)getSystemService(Context.VIBRATOR_SERVICE);; } public static Bitmap getBitmapFromURL(String src) { try { Log.i("src",src); URL url = new URL(src); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setDoInput(true); connection.connect(); InputStream input = connection.getInputStream(); Bitmap myBitmap = BitmapFactory.decodeStream(input); Log.i("Bitmap","returned"); return myBitmap; } catch (IOException e) { e.printStackTrace(); Log.e("Exception",e.getMessage()); return null; } } } when i am clciking on watch now button its giving me 4 options -by mozilz,by chrome,by youtube, i want that when i click on watch now button it get redirect on youtube url link,..how can i do this please give me any suggetion.:(

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  • How to pass multiple params to function in python?

    - by user1322731
    I am implementing 8bit adder in python. Here is the adder function definition: def add8(a0,a1,a2,a3,a4,a5,a6,a7,b0,b1,b2,b3,b4,b5,b6,b7,c0): All function parameters are boolean. I have implemented function that converts int into binary: def intTObin8(num): bits = [False]*8 i = 7 while num >= 1: if num % 2 == 1: bits[i] = True else: bits[i] = False i = i - 1 num /= 2 print bits return [bits[x] for x in range(0,8)] I want this function to return 8 bits. And to use this two functions as follows: add8(intTObin8(1),intTObin8(1),0) So the question is: How to pass 8 parameters using one function?

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  • Is it possible to use the values method for a HashMap if the values are ArrayLists?

    - by Denman
    I'm stuck trying to get something to work in an assignment. I have a HashMap<Integer, ArrayList<Object>> called sharedLocks and I want to check whether a certain value can be found in any ArrayList in the HashMap. The following code obviously wouldn't work because Object[] can't be cast to ArrayList[], but it is a demonstration of the general functionality that I want. ArrayList[] values = (ArrayList[]) sharedLocks.values().toArray(); boolean valueExists = false; for (int i = 0; i < values.length; i++) { if (values[i].contains(accessedObject)) { valueExists = true; } } Is there a way for me to check every ArrayList in the HashMap for a certain value? I'm not sure how to use the values method for HashMaps in this case. Any help would be much appreciated.

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  • Should I denormalize a has_many has_many?

    - by Cameron
    I have this: class User < ActiveRecord::Base has_many :serials has_many :sites, :through => :series end class Serial < ActiveRecord::Base belongs_to :user belongs_to :site has_many :episodes end class Site < ActiveRecord::Base has_many :serials has_many :users, :through => :serials end class Episode < ActiveRecord::Base belongs_to :serial end I would like to do some operations on User.serials.episodes but I know this would mean all sorts of clever tricks. I could in theory just put all the episode data into serial (denormalize) and then group_by Site when needed. If I have a lot of episodes that I need to query on would this be a bad idea? thanks

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