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  • Large number of soft page faults when assigning a TJpegImage to a TBitmap

    - by Robert Oschler
    I have a Delphi 6 Pro application that processes incoming jpeg frames from a streaming video server. The code works but I recently noticed that it generates a huge number of soft page faults over time. After doing some investigation, the page faults appear to be coming from one particular graphics operation. Note, the uncompressed bitmaps in question are 320 x 240 or about 300 KB in size so it's not due to the handling of large images. The number of page faults being generated isn't tolerable. Over an hour it can easily top 1000000 page faults. I created a stripped down test case that executes the code I have included below on a timer, 10 times a second. The page faults appear to happen when I try to assign the TJpegImage to a TBitmap in the GetBitmap() method. I know this because I commented out that line and the page faults do not occur. The assign() triggers a decompression operation on the part of TJpegImage as it pushes the decompressed bits into a newly created bitmap that GetBitmap() returns. When I run Microsoft's pfmon utility (page fault monitor), I get a huge number of soft page fault error lines concerning RtlFillMemoryUlong, so it appears to happen during a memory buffer fill operation. One puzzling note. The summary part of pfmon's report where it shows which DLL caused what page fault does not show any DLL names in the far left column. I tried this on another system and it happens there too. Can anyone suggest a fix or a workaround? Here's the code. Note, IReceiveBufferForClientSocket is a simple class object that holds bytes in an accumulating buffer. function GetBitmap(theJpegImage: TJpegImage): Graphics.TBitmap; begin Result := TBitmap.Create; Result.Assign(theJpegImage); end; // --------------------------------------------------------------- procedure processJpegFrame(intfReceiveBuffer: IReceiveBufferForClientSocket); var theBitmap: TBitmap; theJpegStream, theBitmapStream: TMemoryStream; theJpegImage: TJpegImage; begin theBitmap := nil; theJpegImage := TJPEGImage.Create; theJpegStream:= TMemoryStream.Create; theBitmapStream := TMemoryStream.Create; try // 2 // ************************ BEGIN JPEG FRAME PROCESSING // Load the JPEG image from the receive buffer. theJpegStream.Size := intfReceiveBuffer.numBytesInBuffer; Move(intfReceiveBuffer.bufPtr^, theJpegStream.Memory^, intfReceiveBuffer.numBytesInBuffer); theJpegImage.LoadFromStream(theJpegStream); // Convert to bitmap. theBitmap := GetBitmap(theJpegImage); finally // Free memory objects. if Assigned(theBitmap) then theBitmap.Free; if Assigned(theJpegImage) then theJpegImage.Free; if Assigned(theBitmapStream) then theBitmapStream.Free; if Assigned(theJpegStream) then theJpegStream.Free; end; // try() end; // --------------------------------------------------------------- procedure TForm1.Timer1Timer(Sender: TObject); begin processJpegFrame(FIntfReceiveBufferForClientSocket); end; // --------------------------------------------------------------- procedure TForm1.FormCreate(Sender: TObject); var S: string; begin FIntfReceiveBufferForClientSocket := TReceiveBufferForClientSocket.Create(1000000); S := loadStringFromFile('c:\test.jpg'); FIntfReceiveBufferForClientSocket.assign(S); end; // --------------------------------------------------------------- Thanks, Robert

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  • copying a short int to a char array

    - by cateof
    I have a short integer variable called s_int that holds value = 2 unsighed short s_int = 2; I want to copy this number to a char array to the first and second position of a char array. Let's say we have char buffer[10];. We want the two bytes of s_int to be copied at buffer[0] and buffer[1]. How can I do it?

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  • Counting number of times an item occurs in a linked list

    - by HanaCHaN92
    Here is the assignment: Here's the assignment: Implement a method countValue() that counts the number of times an item occurs in a linked list. Remember to use the STL list. int countValue(list front, const int item); Generate 20 random numbers in the range of 0 to 4, and insert each number in the linked list. Output the list by using a method which you would call writeLinkedList which you would add to the ListP.cpp. In a loop, call the method countValue() , and display the number of occurrences of each value from 0 to 4 in the list. Remember that all the above is to be included in the file ListP.ccp Run: 2 3 4 0 1 0 2 4 2 3 3 4 3 3 3 0 0 2 0 2 0 : 5, 1 : 1, 2 : 5, 3 : 6, 4 : 3 and here is what I have so far: #include<iostream> #include<list> #include<tchar.h> int countValue(list<int> front, const int item); using namespace std; int _tmain(int argc, _TCHAR* argv[]){ list<int> front; int listCount; cout << "Enter the size of the list: "; cin >> listCount; for (int i = 1; i <= listCount; i++) front.insert(rand()%5); cout << "Original List of Values: " << endl; //writeLinkedList(front, " "); cout << endl; for(int j=0;j<5;++j) cout << countValue (front,j) << endl; cout << endl; return 0; } int countValue(list<int> front, const int item) { int count0; int count1; int count2; int count3; int count4; list<int> *List; for(list<int>::iterator i = front.begin(); i != front.end(); i++) { if(List->item == 0) { count0++; } if(List->item == 1) { count1++; } if(List->item == 2) { count2++; } if(List->item == 3) { count2++; }if(List->item == 4) { count4++; } } } And here are the errors: error C2065: 'list' : undeclared identifier line 5 error C2062: type 'int' unexpected line 5 error C2661: 'std::list<_Ty>::insert' : no overloaded function takes 1 arguments line 16 error C3861: 'countValue': identifier not found line 21 IntelliSense: no instance of overloaded function "std::list<_Ty, _Ax>::insert [with _Ty=int, _Ax=std::allocator<int>]" matches the argument list line 16 IntelliSense: too few arguments in function call line 16 error C2039: 'item': is not a member of 'std::list<_Ty>' lines 34, 38, 42, 46, 49 IntelliSense: declaration is incompatible with "int countValue" (declared at line 5) line 25 IntelliSense: class "std::list<int, std:: allocator<int>>" has no member "item" lines 34, 38, 42, 46, 49 I just want to know what I've done wrong and how to fix it and also if someone could help me figure out if I'm doing the countValue function wrong or not based on the instructions I would really appreciate it. I've read the chapter in our textbook several times, looked up tutorials on youtube and on Dream in Code, and still I can not figure this out. All helpful information is appreciated!

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  • How to adjust the distribution of values in a random data stream?

    - by BCS
    Given a infinite stream of random 0's and 1's that is from a biased (e.g. 1's are more common than 0's by a know factor) but otherwise ideal random number generator, I want to convert it into a (shorter) infinite stream that is just as ideal but also unbiased. Looking up the definition of entropy finds this graph showing how many bits of output I should, in theory, be able to get from each bit of input. The question: Is there any practical way to actually implement a converter that is nearly ideally efficient?

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  • Limiting Number of Characters in a ContentEditable div

    - by Bill Dami
    Hi guys, I am using contenteditable div elements in my web application and I am trying to come up with a solution to limit the amount of characters allowed in the area, and once the limit is hit, attempting to enter characters simply does nothing. This is what I have so far: var content_id = 'editable_div'; //binding keyup/down events on the contenteditable div $('#'+content_id).keyup(function(){ check_charcount(content_id, max); }); $('#'+content_id).keydown(function(){ check_charcount(content_id, max); }); function check_charcount(content_id, max) { if($('#'+content_id).text().length > max) { $('#'+content_id).text($('#'+content_id).text().substring(0, max)); } } This DOES limit the number of characters to the number specified by 'max', however once the area's text is set by the jquery .text() function the cursor resets itself to the beginning of the area. So if the user keeps on typing, the newly entered characters will be inserted at the beginning of the text and the last character of the text will be removed. So really, I just need some way to keep the cursor at the end of the contenteditable area's text.

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  • CNAME Record in .htaccess file: correct format?

    - by Josh
    In my .htaccess file, I have set up several A records in the following structure: RewriteCond %{HTTP_HOST} ^domain.com$ [OR] RewriteCond %{HTTP_HOST} ^www.domain.com$ RewriteRule ^substring\/substring\/etc?$ "http\:\/\/domain\.com\/newsubstring\/etc\/" [R=301,L] Is is possible to easily set up a CNAME record in the same fashion and put it in my .htaccess file? Unfortunately, my dumb DNS (namecheap) doesn't let me change CNAME records because my site actually has hosting and isn't just a parked domain. (I actually just want to set up a CNAME for www, since at the moment www.domain.com doesn't work for me, and only domain.com -- I'm going to point the former to the latter.)

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  • ipad video format

    - by Mike
    When you use iTunes to sync your videos with the iPhone the videos are always saved with no more than 640 pixels wide, if I am not wrong. What about the iPad? What is the size of videos iTunes syncs with iPad? 1024x768? and what if the video has a dimension below 1024x768? Will it scale up? or will it keep the video at low res and scale when you play? The question is because I am using the MPMoviePlayerController and I need to know what resolutions to expect, so I can adjust the interface. thanks.

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  • Convert Environment.OSVersion to NTDDI version format

    - by David Brown
    In sdkddkver.h of the Windows Platform SDK, there are various OS versions defined as NTDDI_*. For example, Windows XP and its service packs are defined as: #define NTDDI_WINXP 0x05010000 #define NTDDI_WINXPSP1 0x05010100 #define NTDDI_WINXPSP2 0x05010200 #define NTDDI_WINXPSP3 0x05010300 #define NTDDI_WINXPSP4 0x05010400 There are also masks which, along with the OSVER, SPVER, and SUBVER macros, allow you to pull the respective parts out of the NTDDI version. #define OSVERSION_MASK 0xFFFF0000 #define SPVERSION_MASK 0x0000FF00 #define SUBVERSION_MASK 0x000000FF I have all of these defined as constants in C# and what I'd like to do now is convert the data returned by Environment.OSVersion to a value corresponding to one of the NTDDI versions in sdkddkver.h. I could make a massive switch statement, but that's not really as future-proof as I'd like it to be. I would need to update the conversion method every time a new OS or service pack is released. I have a feeling this could be done with the help of some bitwise operators, but I'll be honest and say that those aren't my strong point. I appreciate any help!

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  • Displaying locale percentage number with Zend Framework

    - by Ronedog
    Does anyone know how to display a percentage format based on the locale using the zend framework? I've tried this below and it doesn't work for some reason: $xx = Zend_Locale::getTranslation(null, 'PercentNumber'); // This outputs: "#,##0%" for locale 'en_us' $percentage = Zend_Locale_Format::getNumber(133.3678, array('number_format' => $xx, 'locale' => $lang_LOCALE)); The output of $percentage is 133.3678. Thanks.

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  • Problem with Json Date format when calling cross-domain proxy

    - by Christo Fur
    I am using a proxy service to allow my client side javascript to talk to a service on another domain The proxy is a simple ashx file with simply gets the request and forwards it onto the service on the other domain : using (var sr = new System.IO.StreamReader(context.Request.InputStream)) { requestData = sr.ReadToEnd(); } string data = HttpUtility.UrlDecode(requestData); using (var client = new WebClient()) { client.BaseAddress = serviceUrl; client.Headers.Add("Content-Type", "application/json"); response = client.UploadString(new Uri(webserviceUrl), data); } The client javascript calling this proxy looks like this function TestMethod() { $.ajax({ type: "POST", url: "/custommodules/configuratorproxyservice.ashx?m=TestMethod", contentType: "application/json; charset=utf-8", data: JSON.parse('{"testObj":{"Name":"jo","Ref":"jones","LastModified":"\/Date(-62135596800000+0000)\/"}}'), dataType: "json", success: AjaxSucceeded, error: AjaxFailed }); function AjaxSucceeded(result) { alert(result); } function AjaxFailed(result) { alert(result.status + ' - ' + result.statusText); } } This works fine until I have to pass a date. At which point I get a Bad Request error when the proxy tries to call the service I did have this working at one point but have now lost it. Have tried using JSON.Parse on the object before sending. and JSON.Stringify, but no joy anyone got any ideas what I am missing

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  • Find Port Number and Domain Name to connect to Hive Table

    - by user1419563
    I am new to Hive, MapReduce and Hadoop. I am using Putty to connect to hive table and access records in the tables. So what I did is- I opened Putty and in the host name I typed- ares-ingest.vip.host.com and then I click Open. And then I entered my username and password and then few commands to get to Hive sql. Below is the list what I did $ bash bash-3.00$ hive Hive history file=/tmp/rjamal/hive_job_log_rjamal_201207010451_1212680168.txt hive> set mapred.job.queue.name=hdmi-technology; hive> select * from table LIMIT 1; So my question is- I was trying to connect to Hive Tables using Squirrel SQL Client, so in that my Connection URL is- jdbc:hive://ares-ingest.vip.host.com:10000/default. So whenever I try to connect with these attributes, I always get Hive: Could not establish connection to ares-ingest.vip.host.com:10000/default: java.net.ConnectException: Connection timed out: connect. It might be possible I am using wrong port number or domain name here. Is there any way from the command prompt I can find out these two things, like what Domain Name and Port Number(where Hive server is running) should I use to connect to Hive table from Squirrel SQL Client. As I know host and port are determined by where the hive server is running

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  • Wrong number of args passed to: repl$repl

    - by grm
    Hi, I have a trouble with a compojure "Getting started" example that I do not seem to understand. When I run the example from http://weavejester.github.com/compojure/docs/getting-started.html ...I get the following error at the lein repl step: ~/hello-www> lein repl src/hello_www/core.clj Exception in thread "main" java.lang.IllegalArgumentException: Wrong number of args passed to: repl$repl (NO_SOURCE_FILE:0) at clojure.lang.Compiler.eval(Compiler.java:5359) at clojure.lang.Compiler.eval(Compiler.java:5311) at clojure.core$eval__4350.invoke(core.clj:2364) at clojure.main$eval_opt__6502.invoke(main.clj:228) at clojure.main$initialize__6506.invoke(main.clj:247) at clojure.main$script_opt__6526.invoke(main.clj:263) at clojure.main$main__6544.doInvoke(main.clj:347) at clojure.lang.RestFn.invoke(RestFn.java:483) at clojure.lang.Var.invoke(Var.java:381) at clojure.lang.AFn.applyToHelper(AFn.java:180) at clojure.lang.Var.applyTo(Var.java:482) at clojure.main.main(main.java:37) Caused by: java.lang.IllegalArgumentException: Wrong number of args passed to: repl$repl at clojure.lang.AFn.throwArity(AFn.java:439) at clojure.lang.AFn.invoke(AFn.java:43) at clojure.lang.Var.invoke(Var.java:369) at clojure.lang.AFn.applyToHelper(AFn.java:165) at clojure.lang.Var.applyTo(Var.java:482) at clojure.core$apply__3776.invoke(core.clj:535) at leiningen.core$_main__59$fn__61.invoke(core.clj:94) at leiningen.core$_main__59.doInvoke(core.clj:91) at clojure.lang.RestFn.applyTo(RestFn.java:138) at clojure.core$apply__3776.invoke(core.clj:535) at leiningen.core$_main__59.invoke(core.clj:97) at user$eval__67.invoke(NO_SOURCE_FILE:1) at clojure.lang.Compiler.eval(Compiler.java:5343) ... 11 more I have tried both the stable and the developer version of lein without any success. Any ideas on what I could look for next? I get the same result both on linux and cygwin. When I run it manually, it seems to work fine on linux: java -cp "lib/*" clojure.main src/hello_www/core.clj 2010-05-17 19:34:17.280::INFO: Logging to STDERR via org.mortbay.log.StdErrLog 2010-05-17 19:34:17.281::INFO: jetty-6.1.14 2010-05-17 19:34:17.382::INFO: Started [email protected]:8080

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  • Get contact name from just the number

    - by user1190019
    Say i have an edit text and a button. In the edit text you would type a number and then when you hit the button it will either show the contact information or return with the name of that contact. I have tried all sorts of methods provided with no luck. The one i have successfully gotten the furthest with was the following... But i had no luck returning the name. Cursor phoneCursor = null; contactList = new HashMap<String,String>(); try{ Uri uContactsUri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI; String strProjection = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME; phoneCursor = getContentResolver().query(uContactsUri, null, null, null, strProjection); phoneCursor.moveToFirst(); String name = ""; String phoneNumber = ""; int nameColumn = phoneCursor.getColumnIndex(Phone.DISPLAY_NAME); int phoneColumn = phoneCursor.getColumnIndex(Phone.NUMBER); phoneCursor.moveToNext(); } } catch(Exception e){ Log.e("[SmsMain] getContactData", e.toString()); } finally{ if(phoneCursor != null){ phoneCursor.close(); phoneCursor = null; } } }

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  • C#: File-size format provider

    - by Seb Nilsson
    Is there any easy way to create a class that uses IFormatProvider that writes out a user-friendly file-size? public static string GetFileSizeString(string filePath) { FileInfo info = new FileInfo(@"c:\windows\notepad.exe"); long size = info.Length; string sizeString = size.ToString(FileSizeFormatProvider); // This is where the class does its magic... } It should result in strings formatted something like "2,5 MB", "3,9 GB", "670 bytes" and so on.

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  • ipad vide format

    - by Mike
    When you use iTunes to sync your videos with the iPhone the videos are always saved with no more than 640 pixels wide, if I am not wrong. What about the iPad? What is the size of videos iTunes syncs with iPad? 1024x768? and what if the video has a dimension below 1024x768? Will it scale up? or will it keep the video at low res and scale when you play? thanks.

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  • Searching Week-wise/Month-wise record counts(number) and the StartDate+EndDate(datetime) of the Week

    - by Muzaffar Ali Rana
    I have a question in connection to this question earlier posted by me:- http://stackoverflow.com/questions/2452984/daily-weekly-monthly-record-count-search-via-storedprocedure I want to have the Count of Calls on Weekly-basis and Monthly-basis, Daily-basis issue is resolved. ISSUE NUMBER @1:Weekly-basis Count of Calls and Start-Date and End-Date of Week I have searched the Start-Date and End-Date of Week including their individual Count of Calls as well in the below-mentioned query. But the problem is that I could not get the result in one single table, although I have used the Temporary Tables(#TempTable+#TempTable2). Kindly help me in this regards. NOTE:Table Creation commented as for executing more than once. ----- *** TABLE CREATION OF #TempTable & #TempTable2 *** ---------- --CREATE TABLE #TempTable( StartDate datetime,EndDate datetime,CallCount numeric(18,5)) --CREATE TABLE #TempTable2( StartDate datetime,EndDate datetime,CallCount numeric(18,5)) DECLARE @StartDate datetime,@EndDate datetime,@StartDateTemp1 datetime,@StartDateTemp2 datetime,@EndDateTemp datetime,@Period varchar(50); SET @StartDate='1/1/2010'; SET @EndDate='2/28/2010'; SET @StartDateTemp1=@StartDate; SET @StartDateTemp2=DATEADD(dd, 7, @StartDate ); SET @Period='Weekly'; IF (@Period = 'Weekly') BEGIN WHILE ((@StartDate <= @StartDateTemp1) AND (@StartDateTemp2 <= @EndDate)) BEGIN IF((@StartDateTemp1 < @StartDateTemp2 ) AND (@StartDateTemp1 != @StartDateTemp2) ) BEGIN SELECT convert(varchar, @StartDateTemp1, 106) AS 'Start Date', convert(varchar, @StartDateTemp2, 106) AS 'End Date', COUNT(*) AS 'Call Count' FROM TRN_Call WHERE (CallTime = @StartDateTemp1 AND CallTime <= @StartDateTemp2 ); END SET @StartDateTemp1 = DATEADD(dd, 7, @StartDateTemp1); SET @StartDateTemp2 = DATEADD(dd, 7, @StartDateTemp2); END END ISSUE NUMBER @2:Monthly-basis Count of Calls and Start-Date and End-Date of Week In this case, I have the same search, but will have to search the Call Counts plus the Start-Date and End-Date of the Month. Kindly help me in this regards as well.

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  • Variable number of two-dimensional arrays into one big array

    - by qlb
    I have a variable number of two-dimensional arrays. The first dimension is variable, the second dimension is constant. i.e.: Object[][] array0 = { {"tim", "sanchez", 34, 175.5, "bla", "blub", "[email protected]"}, {"alice", "smith", 42, 160.0, "la", "bub", "[email protected]"}, ... }; Object[][] array1 = { {"john", "sdfs", 34, 15.5, "a", "bl", "[email protected]"}, {"joe", "smith", 42, 16.0, "a", "bub", "[email protected]"}, ... }; ... Object[][] arrayi = ... I'm generating these arrays with a for-loop: for (int i = 0; i < filter.length; i++) { MyClass c = new MyClass(filter[i]); //data = c.getData(); } Where "filter" is another array which is filled with information that tells "MyClass" how to fill the arrays. "getData()" gives back one of the i number of arrays. Now I just need to have everything in one big two dimensional array. i.e.: Object[][] arrayComplete = { {"tim", "sanchez", 34, 175.5, "bla", "blub", "[email protected]"}, {"alice", "smith", 42, 160.0, "la", "bub", "[email protected]"}, ... {"john", "sdfs", 34, 15.5, "a", "bl", "[email protected]"}, {"joe", "smith", 42, 16.0, "a", "bub", "[email protected]"}, ... ... }; In the end, I need a 2D array to feed my Swing TableModel. Any idea on how to accomplish this? It's blowing my mind right now.

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  • Excel parsing (xls) date error

    - by tau-neutrino
    I'm working on a project where I have to parse excel files for a client to extract data. An odd thing is popping up here: when I parse a date in the format of 5/9 (may 9th) in the excel sheet, I get 39577 in my program. I'm not sure if the year is encoded here (it is 2008 for these sheets). Are these dates the number of days since some sort of epoch? Does anyone know how to convert these numbers to something meaningful? I'm not looking for a solution that would convert these properly at time of parsing from the excel file (we already have thousands of extracted files that required a human to select relevant information - re-doing the extraction is not an option).

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  • Large number of simultaneous long-running operations in Qt

    - by Hostile Fork
    I have some long-running operations that number in the hundreds. At the moment they are each on their own thread. My main goal in using threads is not to speed these operations up. The more important thing in this case is that they appear to run simultaneously. I'm aware of cooperative multitasking and fibers. However, I'm trying to avoid anything that would require touching the code in the operations, e.g. peppering them with things like yieldToScheduler(). I also don't want to prescribe that these routines be stylized to be coded to emit queues of bite-sized task items...I want to treat them as black boxes. For the moment I can live with these downsides: Maximum # of threads tend to be O(1000) Cost per thread is O(1MB) To address the bad cache performance due to context-switches, I did have the idea of a timer which would juggle the priorities such that only idealThreadCount() threads were ever at Normal priority, with all the rest set to Idle. This would let me widen the timeslices, which would mean fewer context switches and still be okay for my purposes. Question #1: Is that a good idea at all? One certain downside is it won't work on Linux (docs say no QThread::setPriority() there). Question #2: Any other ideas or approaches? Is QtConcurrent thinking about this scenario? (Some related reading: how-many-threads-does-it-take-to-make-them-a-bad-choice, many-threads-or-as-few-threads-as-possible, maximum-number-of-threads-per-process-in-linux)

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