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  • Is it a good practice to create a list of definitions for all symbols and words in a programming language?

    - by MrDaniel
    After arriving at this point in Learning Python The Hard Way I am wondering if this is a good practice to create a list of symbols and define what they do as noted in bold below, for every programming language. This seems reasonable, and might be very useful to have when jumping between programming languages? Is this something that programmers do or is it just a waste of effort? Exercise 22: What Do You Know So Far? There won't be any code in this exercise or the next one, so there's no WYSS or Extra Credit either. In fact, this exercise is like one giant Extra Credit. I'm going to have you do a form of review what you have learned so far. First, go back through every exercise you have done so far and write down every word and symbol (another name for 'character') that you have used. Make sure your list of symbols is complete. Next to each word or symbol, write its name and what it does. If you can't find a name for a symbol in this book, then look for it online. If you do not know what a word or symbol does, then go read about it again and try using it in some code. You may run into a few things you just can't find out or know, so just keep those on the list and be ready to look them up when you find them. Once you have your list, spend a few days rewriting the list and double checking that it's correct. This may get boring but push through and really nail it down. Once you have memorized the list and what they do, then you should step it up by writing out tables of symbols, their names, and what they do from memory. When you hit some you can't recall from memory, go back and memorize them again.

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  • Serve up syntactic XHTML5 using the text/html MIME type?

    - by cboettig
    I have a site currently written with HTML5 tags. I'd like to be able to parse the site as XML, with support for namespaces, etc, to facilitate programmatic extraction of data. Currently I have <!DOCTYPE html> and <meta charset="utf-8"> Which I gather is equivalent in HTML5 to explicitly setting the content-types as <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> for my current setup. In order to serve XML it sounds like the right thing to do is <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> Should I also change my Content-Type to <meta http-equiv="content-type" content="application/xhtml+xml; charset=iso-8859-1" /> Or is that not necessary? What is the advantage of having content-type be "application/xhtml+xml"? What is the disadvantage? (Sounds like it may break internet explorer rendering of the site? but maybe that information is out of date now?) Many thanks!

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  • How do I convert mouse co-ordinates in Slick2d java?

    - by Trycon
    I'm really new in Java and I really want to how do I convert the mouse clicks to co-ordinates in game. My game moves its images so that the camera could stay with the character. I follwed thenewboston tutorials. I have been modifying new codes for smoother gameplay. I have been searching the web for tutorials. This is one of the codes: PosGameX=MouseX+0; PosGameY=MouseY+0; I have not try this code but, I really think this would not work. The website I have visited, I think, is not good for coding. My gameplay is that when the mouse clicks on a position. It would try to get the co-ordinates(Mouse) and convert it to game co-ordinates. And I really want to know how do I make my mouse clicks to game co-ordinates? FOR MORE INFO: Searches: How Do I translate game co-ordinates? How Do I translate mouse to game co-ordinates? AND PLEASE! Do not give me algebra. I have really forgotten those.

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  • What is meant by "no password set" for root account (and otthers)?

    - by MMA
    Several years back, we were more accustomed to changing to the root account using the su command. First, we switched to the root account, and then executed those root commands. Now we are more accustomed to using the sudo command. But we know that the root account is there. We can readily find the home directory of user root. $ ls -ld /root/ drwx------ 18 root root 4096 Oct 22 17:21 /root/ Now my point is, it is stated that "the root password in Ubuntu is left unset". Please see the answers to this question. Most of the answers have something to this effect in the first paragraph. One or two answers further state that "the account is left disabled". Now my (primary) questions are, What is meant by an unset password? Is it blank? Is it null? Or something else more cryptic? How does the account becomes enabled once I set password for it? (sudo password root) In order get a better understanding, I checked the /etc/shadow file. Since I have already set a password for the root account, I can no longer see what is there (encrypted password). So, I created another account and left it disabled. The corresponding entry in the /etc/shadow file is, testpassword:!:16020:0:99999:7::: Now perhaps my above queries need to be changed to, what does an ! in password field mean? Other encrypted passwords are those very long cryptic strings. How come this encrypted form is only one character long? And does an account become disabled if I put an ! in the (encrypted) password field?

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  • Should sanity be a property of a programmer or a program?

    - by toplel32
    I design and implement languages, that can range from object notations to markup languages. In many cases I have considered restrictions in favor of sanity (common knowledge), like in the case of control characters in identifiers. There are two consequences to consider before doing this: It takes extra computation It narrows liberty I'm interested to learn how developers think of decisions like this. As you may know Microsoft C# is very open on the contrary. If you really want to prefix your integer as Long with 'l' instead of 'L' and so risk other developers of confusing '1' and 'l', no problem. If you want to name your variables in non-latin script so they will contrast with C#'s latin keywords, no problem. Or if you want to distribute a string over multiple lines and so break a series of indentation, no problem. It is cheap to ensure consistency with restrictions and this makes it tempting to implement. But in the case of disallowing non-latin characters (concerning the second example), it means a discredit to Unicode, because one would not take full advantage of its capacity.

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  • How to build a "traffic AI"?

    - by Lunikon
    A project I am working on right now features a lot of "traffic" in the sense of cars moving along roads, aircraft moving aroun an apron etc. As of now the available paths are precalculated, so nodes are generated automatically for crossings which themselves are interconnected by edges. When a character/agent spawns into the world it starts at some node and finds a path to a target node by means of a simply A* algorithm. The agent follows the path and ultimately reaches its destination. No problem so far. Now I need to enable the agents to avoid collisions and to handle complex traffic situations. Since I'm new to the field of AI I looked up several papers/articles on steering behavior but found them to be too low-level. My problem consists less of the actual collision avoidance (which is rather simple in this case because the agents follow strictly defined paths) but of situations like one agent leaving a dead-end while another one wants to enter exactly the same one. Or two agents meeting at a bottleneck which only allows one agent to pass at a time but both need to pass it (according to the optimal route found before) and they need to find a way to let the other one pass first. So basically the main aspect of the problem would be predicting traffic movement to avoid dead-locks. Difficult to describe, but I guess you get what I mean. Do you have any recommendations for me on where to start looking? Any papers, sample projects or similar things that could get me started? I appreciate your help!

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  • share code between check and process methods

    - by undu
    My job is to refactor an old library for GIS vector data processing. The main class encapsulates a collection of building outlines, and offers different methods for checking data consistency. Those checking functions have an optional parameter that allows to perform some process. For instance: std::vector<Point> checkIntersections(int process_mode = 0); This method tests if some building outlines are intersecting, and return the intersection points. But if you pass a non null argument, the method will modify the outlines to remove the intersection. I think it's pretty bad (at call site, a reader not familiar with the code base will assume that a method called checkSomething only performs a check and doesn't modifiy data) and I want to change this. I also want to avoid code duplication as check and process methods are mostly similar. So I was thinking to something like this: // a private worker std::vector<Point> workerIntersections(int process_mode = 0) { // it's the equivalent of the current checkIntersections, it may perform // a process depending on process_mode } // public interfaces for check and process std::vector<Point> checkIntersections() /* const */ { workerIntersections(0); } std::vector<Point> processIntersections(int process_mode /*I have different process modes*/) { workerIntersections(process_mode); } But that forces me to break const correctness as workerIntersections is a non-const method. How can I separate check and process, avoiding code duplication and keeping const-correctness?

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  • "bug" in C++11 text by Stroustrup?

    - by Astara
    I found an apparent contradiction in the c++ text having to do with the result of the c_str() function operating on std:strings (in my copy, the definition and contradiction are on p1040). First it defines the c_str() function as something that produces a 'C-style' (zero-terminated) string, but later it talks about how a C++ c_str value can have embed a 'C'-style, end-of-string terminators (i.e. NUL's) embedded in the string (that is defined by being NUL terminated). Um... does anyone else feel that this is a 'stretching' of the definition of a C-string beyond it's definition? I.e. I think what it means, is that if you were to look at the length() function as applied to the string, it will show a different end of string than using the C-definition of a z-string -- one that can contain any character except NUL, and is terminated by NUL. I likely don't have to worry about it in my of my programs, but it seems like a subtle distinction that makes a C++ c_str, not really a 'C'-string. Am I misunderstanding this issue? Thanks!

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  • Create a Texture2D from larger image

    - by Dialock
    I am having trouble with the basic logic of this solution: Xna: Splitting one large texture into an array of smaller textures in respect to my specific problem (specifically, I'm looking at the second answer.) How can I use my source rectangle that I already use for drawing to create a new Texture2D? spriteBatch.Draw(CurrentMap.CollisionSet, currentMap.CellScreenRectangle(x, y), CurrentMap.TileSourceRectangle(currentMap.MapCells[x, y].TileDepths[4]), Color.FromNonPremultiplied(0,0,0, 45), 0.0f, Vector2.Zero, SpriteEffects.None, 0.91f); I know I want a method that I started so: //In Update Method of say the player's character. Texture2D CollisionTexture = ExtractTexture(MapManager.CurrentMap.CollisionSet, MapManager.TileWidth, MapManager.TileHeight); // In MapManager Class who knows everything about tiles that make up a level. public Texture2D ExtractTexture(Texture2D original, int partWidth, int partheight, MapTile mapCell) { var dataPerPart = partWidth * partheight; Color[] originalPixelData = new Color[original.Width * original.Height]; original.GetData<Color>(originalPixelData); Color[] newTextureData = new Color[dataPerPart]; original.GetData<Color>(0, CurrentMap.TileSourceRectangle(mapCell.TileDepths[4]), originalPixelData, 0, originalPixelData.Count()); Texture2D outTexture = new Texture2D(original.GraphicsDevice, partWidth, partheight); } I think the problem is I'm just not understanding the overload of Texture2D.GetData< Part of my concern is creating an array of the whole texture in the first place. Can I target the original texture and create an array of colors for copying based on what I already get from the method TileSourceRecatangle(int)?

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  • SQL RDBMS : one query or multiple calls

    - by None None
    After looking around the internet, I decided to create DAOs that returned objects (POJOs) to the calling business logic function/method. For example: a Customer object with a Address reference would be split in the RDBMS into two tables; Customer and ADDRESS. The CustomerDAO would be in charge of joining the data from the two tables and create both an Address POJO and Customer POJO adding the address to the customer object. Finally return the fulll Customer POJO. Simple, however, now i am at a point where i need to join three or four tables and each representing an attribute or list of attributes for the resulting POJO. The sql will include a group by but i will still result with multiple rows for the same pojo, because some of the tables are joining a one to many relationship. My app code will now have to loop through all the rows trying to figure out if the rows are the same with different attributes or if the record should be a new POJO. Should I continue to create my daos using this technique or break up my Pojo creation into multiple db calls to make the code easier to understand and maintain?

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  • Configuring network to set wlan0 as primary

    - by Sheed
    I recently had to rebuild my pc and decided to go for ubuntu 14.04. I think the mistake I made was I started from a 12.04 install disk instead of the 12.10 disk I'd used previously and when given the option set my primary connection as ethernet (because the wireless option didn't work). After upgrading to 14.04 etc, I managed to get the wireless working, or more using steps like ifconfig -a and the likes I managed to prove that the wireless card etc. is all installed and working. However every time I boot without a hard wired connection plugged in I get the message "waiting for network configuration". I can then once it's booted without a network get my wirless working using sudo ifconfig wlan0 up iwlist wlan0 scan This seems to kick the wireless module into life and it appears in the GUI and I can then select a network, however all the options like edit network and disconnect etc are all greyed out. What I would like of course is if the WLAN0 was just set as my primary default network so I've been looking for a solution to this and it would seem that I need to adjust the old /etc/network/interfaces file but when I try to do so using the sudo vi /etc/network/interfaces command I, well I simply have no idea what I'm doing. Other than that typing :q! gets me out of there before I do to much damage! As far as I can tell (by navigating to the file in the GUI) the output of my /etc/network/interfaces is as follows: (obviously not including the " in each line that's just to break the heading rule of the #) "# This file describes the network interfaces available on your system "# and how to activate them. For more information, see interfaces(5). "# The loopback network interface auto lo iface lo inet loopback "# The primary network interface auto eth0 iface eth0 inet dhcp If this is the case then this clearly doesn't contain what it should do but I don't how to fix it. Nor do I even know if I'm on the right track. Any help would be appreciated thanks :)

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  • Is it possible/likely to be paid fairly without a college degree? [closed]

    - by user20134
    Some back story, and then my question: I took a "break" from getting a university education last year to work full time as back end developer on a GIS application at $10.50 an hour. Later that year I was hired on by a fairly prestigious organization on their GIS application for a meager salary + rockin' benefits (not that I need them). I agreed to work on this project through Summer 2012. I don't feel like I'm being fairly compensated for my time. Other team members make between 3-5 times as much as I do, and their work isn't 3-5 times as good as mine, nor do they have 3-5 times as much output. I don't think this is a rectifiable situation within this institution. They've got a set of personnel charts and the way it gets computed, I make less money than any of the janitors (who are very good, and very nice people to boot, and I'm glad they get paid so well. I wish everyone got livable wages). I'm pretty bright, but school's a drag. I don't want mega bucks, I just want $40k/yr (localized to the southeast united states) so I can save enough money to travel, or maybe "finish [my] education". My question is this: Are people without degrees ever compensated commensurate with other people who have degrees? As a someone who never "finished their education", how badly do you think this as hurt you? How do you navigate the job seeking and hiring process? As someone who hires programmers, do you pay more for diplomas? Is that an institutional necessity, or based on your own value judgement?

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  • How do I install Kodos in 12.10?

    - by Brutus
    In previous Ubuntu version I used Kodos extensively. But the package has been dropped in 12.10. It's a neat regular expression testing tool. It's hard to find an alternative that is not Windows only (or Air, or uses action script which bails on more complicated RegEx, or works in Wine - well kinda, but not really..., etc.). So I tried to install Kodos from source, which seems to work (download sourceball and setup.py) but it won't run because of missing PyQT dependencies (that I can't manage to fulfill with anything install-able trough standard packages). I then tried to install PyQT manually (which seems to require manual install of SIP and QT too) and instead of pip I have to use configure.py and qmake. It throws error after error at me. I tried to overcome one after another for over an hour but no luck. It even managed to break Calibre and Music Brains Picard. So I purged all the stuff, reinstalled python-sipand python-qt4 from the standard packages and gave up. Has anyone managed to get Kodos running on 12.10? Or any hints on how to do it?

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  • "Do it right, against customer's wishes" - how is it called?

    - by SF.
    We know the optimal situation of negotiating corrections of specifications with the customer, getting the specs to do what the client wanted, not what they said or thought they wanted. That's negotiating, explaining. Sometimes, we're unable to convince the client. We're forced to produce broken as designed. This, called "demonology" by merit of mages summoning demons and demons fulfilling their wishes very literally, causing the mage's demise as result, is another approach that will leave the customer very dissatisfied once they realize their error, and of course try to pin the blame on the developer. Now I just faced a very different approach: the customer created simple specs that fail to account for some critical caveat, and is completely unwilling to fix them, admit the obvious errors and accept suggested corrections. The product made to these specs will be critically broken, and possibly might cost human lives. Still, it's too late to drop the contract entirely. The contract has punitive clauses for that, ones we can't really accept. The boss' decision? We do the work right and lie to the customer that we did it according to the specs. The algorithms in question are hidden deep enough under the surface, the product will do the work just fine, won't fail in the caveat situation, and unless someone digs too deep, they will never discover we didn't break it as requested. Is there some common name for this tactics of execution of specs?

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  • Why I am getting Presentation Error [on hold]

    - by user105697
    Below is my code. When I submit it in UVA they are giving me Presentation error. I want to know the reason. I have tried all possible ways. In my code I use 2D-array to store each word of a sentence. I also want to know the reason for giving presentation error. #include<stdio.h> #include<string.h> int main() { char a[10000],ar[100][10000]; int i,j,k,m,n,l,len[10000],c; freopen("input.txt","r",stdin); while(gets(a)) { k=0; i=0; c=0; for(j=0; ; ++k) { if(a[k]==' ' || a[k]=='\0') { ar[i][j]='\0'; len[i]=c; if(a[k]=='\0') break; i++; j=0; c=0; } else { ar[i][j]=a[k]; c++; j++; } } for(m=0; m<=i; m++) { for(n=(len[m]-1); n>=0; n--) { printf("%c",ar[m][n]); } printf(" "); } printf("\n"); } return 0; }

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  • Unable to debug javascript?

    - by linkme69
    I’m having some problems debugging an encoded javacscript. This script I’m referring to given in this link over here. The encoding here is simple and it works by shifting the unicodes values to whatever Codekey was use during encoding. The code that does the decoding is given here in plain English below:- <script language="javascript"> function dF(s){ var s1=unescape(s.substr(0,s.length-1)); var t=''; for(i=0;i<s1.length;i++)t+=String.fromCharCode(s1.charCodeAt(i)-s.substr(s.length-1,1)); document.write(unescape(t)); } I’m interested in knowing or understanding the values (e.g s1,t). Like for example when the value of i=0 what values would the following attributes / method would hold s1.charCodeAt(i) and s.substr(s.length-1,1) The reason I’m doing this is to understand as to how a CodeKey function really works. I don’t see anything in the code above which tells it to decode on the basis of codekey value. The only thing I can point in the encoding text is the last character which is set to 1 , 2 ,3 or 4 depending upon the codekey selected during encoding process. One can verify using the link I have given above. However, to debug, I’m using firebug addon with the script running as localhost on my wamp server. I’m able to put a breakpoint on the js using firebug but I’m unable to retrieve any of the user defined parameters or functions I mentioned above. I want to know under this context what would be best way to debug this encoded js.

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  • Release Notes for 6/7/2012

    Here are the notes for this week’s release: Pull Requests We added diff previews to the pull request creation page so that you have more context in the pull request that you’re creating. Bug Fixes Fixed an issue that prevented users from downloading files if they were using an ad blocker browser plug-in. Fixed an issue that caused harmless error messages to appear when pushing changes using Git. Fixed an issue where visiting the project openings search results would result in a non-functional search box. Fixed an issue where projects would break if users attempted to publish the project with an empty description. Known Issues The formatting of tabs on pull requests has disappeared. We’ll fix this issue early next week with another deployment. Have ideas on how to improve CodePlex? Visit our ideas page! Vote for your favorite ideas or submit a new one. Got Twitter? Follow us and keep apprised of the latest releases and service status at @codeplex.

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  • how to speed up this code? [migrated]

    - by dot
    I have some code that's taking over 3 seconds to complete. I'm just wondering if there's a faster way to do this. I have a string with anywhere from 10 to 70 rows of data. I break it up into an array and then loop through the array to find specific patterns. $this->_data = str_replace(chr(27)," ",$this->_data,$count);//strip out esc character $this->_data = explode("\r\n", $this->_data); $detailsArray = array(); foreach ($this->_data as $details) { $pattern = '/(\s+)([0-9a-z]*)(\s+)(100\/1000T|10|1000SX|\s+)(\s*)(\|)(\s+)(\w+)(\s+)(\w+)(\s+)(\w+)(\s+)(1000FDx|10HDx|100HDx|10FDx|100FDx|\s+)(\s*)(\w+)(\s*)(\w+|\s+)(\s*)(0)/i'; if (preg_match($pattern, $details, $matches)) { array_push($detailsArray, array( 'Port' => $matches[2], 'Type' => $matches[4], 'Alert' => $matches[8], 'Enabled' => $matches[10], 'Status' => $matches[12], 'Mode' => $matches[14], 'MDIMode' => $matches[16], 'FlowCtrl' => $matches[18], 'BcastLimit' => $matches[20])); }//end if }//end for $this->_data = $detailsArray; Just wondering if you think there's a way to make it more efficient. Thanks.

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  • Evaluating this huge .... thing? [closed]

    - by Shark
    I'll just leave this here: superTiled = ((((gctUINT32) (hardware->chipMinorFeatures)) >> (0 ? 12:12) & ((gctUINT32) ((((1 ? 12:12) - (0 ? 12:12) + 1) == 32) ? ~0 : (~(~0 << ((1 ? 12:12) - (0 ? 12:12) + 1)))))) == (0x1 & ((gctUINT32) ((((1 ? 12:12) - (0 ? 12:12) + 1) == 32) ? ~0 : (~(~0 << ((1 ? 12:12) - (0 ? 12:12) + 1))))))); If you can break it down into 'steps' or a single numeric value - props to you :) I see that this is generated/ unwrapped macros code but .... can't really wrap around it atm. The first person that breaks this down / simplifies it a bit gets to know which driver i found it in. Cheers :)

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  • ???? “Java?”???????? ?Java???????????!--Java Day Tokyo 2013????

    - by ???Y
    2013?5?14????????Java Day Tokyo 2013?????????????????????1????????Java??????????????JavaOne???????????????????????????Java????????????????????????????????????????????????????????????????????????????????????(????) JavaOne?????????Java Day Tokyo 2013??? ??????Java?????????Java????????(JJUG)??????????????????????????????JJUG????????????????????????????????????????????????????????????????? ???????????????(?????) ???????????????????????????????4???????????????????????"Java SE 8"???????????????????????????????????????????????????? ??????????????????????????????????????2???????????? ???BigDecimal?????equals????????? 1???????BigDecimal?????equals???????????????????????????????????(equity)???(liabilities)?????????(asset)??????1???????????????? ????????Java SE 8???????????????????????????????????????????2??????????????????????????????????????????????????????????????????????????????????????????????????????????0???1???2?????????????? ?????????????BigDecimal???????????????????????????"100"???????????????????????100.00??????????????????????"10000"?????????????????10000????? ??????????BigDecimal?????equals?????????????????????????????2??????????????"10000"??????10000?????????????1???????????"100"???100.00??????????????????? ????????????????equals?????????2???????????????????????????????????????1??????????????????????compareTo???????????????????????????? switch????????? ??????HTML???HTML5????????????????Map?????<Progress>???<tt>???<applet>????3???????????????(new=?????deprecated=????removed=??)???????????switch??????????????????????????????????? ????????????????????????(????applet)?????????????????????????????decorate????????????????????????StringBuilder?????????????????????????? ??????????????????"<applet>?HTML5?????????"??????????????????????????????????????????4????? ???????????????????? ????????????????????????switch???case?break??????????????????????????????????"<applet>?HTML5?????????"???????????????????? ???????????????????????????????????switch??????????????????????????Java SE 6???switch????????????????????????Java SE 7?????????????????????????????????????????? ?????????????????? ????????????????????????????????????????????decorate??????????StringBuilder?????????????????????????????char???????(<)??????????????StringBuilder?????????char????????????????????????????????????????????int???99????????????? ????????????????????????append???????????name???(applet)??>?????????????????????????applet>????????? ????????????Map?status??<applet>???????applet>???????????switch??????status.get(key)????????????status?????null??????????? ???????"??"?????Java?????switch???????null????????NullPointerException??????????? ????????????????????????????????????? ????char?????????????????????????????(IDE)??????????????????????????????????????switch?????????????null????????????????????? ???????2???????????????????Java????·?????????????????????????????????????????????????????????????????????????

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  • ???????????/??????????????????|WebLogic Channel|??????

    - by ???02
    ?WebLogic Server???????????????????――???????WebLogic Server???????????????1???????????????????????????????????·????????????????????2011?11????????Oracle DAB & Developers Days 2011??????????????????????????WebLogic Server???????????????????????????????????????????????/?????????????????????????(???)????????????3??????????????????――??????????????????2????????·????????3?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ???????????????????????????????????????????8?????????????????5???????3?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ??????????300~3,500?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????·????????????????????????????????????????????????????¦???????????·??????????――?????·??????·???????????WebLogic????? ???????????????300??????????????????????????????????????????????????300???????????????????????????????????????????????????????????????????????????????(??????500???)???????????????????????????????????????????????????????????????????·??????????????????????????????????????¦????????????WebLogic Server - ???????·???????????4???????????????????????――???????????? ????????????????????????????????????????????????JDBC???????????????????JDBC??????????????????????JDBC????????????????????????????????????????????????????????? ??????????????????????????????????300????????500????????0????????100????????????????????????????????????????????????????????0??????????????????????????????????????????????????????????? ?????????????????????????????????????????????????????????JDBC????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????·?????????????????????????????¦?????Pick-Up???????WebLogic Server JDBC???·???????(10.3.4) ????????????????????????????????????????????????????????????????????????????? ??????????????????????????????????????????300?????????????????100???????????????????????????????????????????????????????????????????????????0??????????????????????????????????????????????????????????????????????????????????????????????? ????1????1????????????????????????????????????(???????????????)??????????????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ???????????????????JDBC??????????????????????????????????JDBC???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????·????????????????????????????????????????????????????????????????MBean???????WebLogic Server???????? ?????????????????????????????MBean???????????? ??????????????MBean??????????????MBean???????????????????PendingUserRequestCount)??????????????????????·?????(ExecuteThreadIdleCount)????·??????????????????????·?????(StandbyThreadCount)?????????????????????·?????????????????(ExecuteThreadTotalCount)??????????????????????????????????????????????????????=????????-??????·??????-?????·????? ? ????????????MBean??????????????MBean???????????????(ActiveConnectionsCurrentCount)?????????????????????????????????????(ActiveConnectionsHighCount)????????????????????????????????????????????????????????????(WaitingForConnectionCurrentCount)?????????????????????????????(WaitingForConnectionHighCount)?????????????????????????????????????????????(?)(WaitSecondsHighCount)???????????????????????????????????? ????????????????????????WebLogic Server???????????????????????? ???????MBean????????WebLogic Server????????????????????WebLogic Scripting Tool(WLST)?????????????????????????????????????WLST????????????connect('weblogic','welcome1','t3://localhost:7001')import timeimport tracebackserverRuntime()print "Day,Time,State,CurrCapacity,ActiveConnectionsCurrentCount,WaitingForConnectionCurrentCount"while(true): try: oJDBCDataSourceRuntime = getMBean('JDBCServiceRuntime/<????>/JDBCDataSourceRuntimeMBeans/<???????>') oState = oJDBCDataSourceRuntime.getState() oCurrCapacity = oJDBCDataSourceRuntime.getCurrCapacity() oActiveConnectionsCurrentCount = oJDBCDataSourceRuntime.getActiveConnectionsCurrentCount() oWaitingForConnectionCurrentCount = oJDBCDataSourceRuntime.getWaitingForConnectionCurrentCount() print time.strftime('%Y-%m-%d,%H:%M:%S') + "," + str(oState) + "," + str(oCurrCapacity) + "," + str(oActiveConnectionsCurrentCount) + "," + str(oWaitingForConnectionCurrentCount) time.sleep(1) except: print "<<<error>>>" traceback.print_exc() disconnect() break ?????????test.py??????/????????????????$ java weblogic.WLST test.py...?...Day,Time,State,CurrCapacity,ActiveConnectionsCurrentCount,WaitingForConnectionCurrentCount2011-10-31,22:39:01,Running,10,0,02011-10-31,22:39:02,Running,10,0,02011-10-31,22:39:03,Running,12,9,02011-10-31,22:39:04,Running,22,18,02011-10-31,22:39:05,Running,29,15,02011-10-31,22:39:06,Running,29,14,02011-10-31,22:39:07,Running,16,15,02011-10-31,22:39:08,Running,19,15,02011-10-31,22:39:09,Running,19,15,02011-10-31,22:39:10,Running,19,14,02011-10-31,22:39:11,Running,19,15,02011-10-31,22:39:12,Running,19,14,02011-10-31,22:39:13,Running,19,0,0 WLST??????WebLogic Channel?????????·???????! ?WebLogic Scripting Tool????WebLogic Server???/?????????????????????????????????????¦????????·???????! ?WebLogic Scripting Tool????WebLogic Server???/???????¦Oracle DAB & Developers Days 2011????????????????????WebLogic Server??????????????

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  • Profile System: User share the same id

    - by Malcolm Frexner
    I have a strange effect on my site when it is under heavy load. I randomly get the properties of other users settings. I have my own implementation of the profile system so I guess I can not blame the profile system itself. I just need a point to start debugging from. I guess there is a cookie-value that maps to an Profile entry somewhere. Is there any chance to see how this mapping works? Here is my profile provider: using System; using System.Text; using System.Configuration; using System.Web; using System.Web.Profile; using System.Collections; using System.Collections.Specialized; using B2CShop.Model; using log4net; using System.Collections.Generic; using System.Diagnostics; using B2CShop.DAL; using B2CShop.Model.RepositoryInterfaces; [assembly: log4net.Config.XmlConfigurator()] namespace B2CShop.Profile { public class B2CShopProfileProvider : ProfileProvider { private static readonly ILog _log = LogManager.GetLogger(typeof(B2CShopProfileProvider)); // Get an instance of the Profile DAL using the ProfileDALFactory private static readonly B2CShop.DAL.UserRepository dal = new B2CShop.DAL.UserRepository(); // Private members private const string ERR_INVALID_PARAMETER = "Invalid Profile parameter:"; private const string PROFILE_USER = "User"; private static string applicationName = B2CShop.Model.Configuration.ApplicationConfiguration.MembershipApplicationName; /// <summary> /// The name of the application using the custom profile provider. /// </summary> public override string ApplicationName { get { return applicationName; } set { applicationName = value; } } /// <summary> /// Initializes the provider. /// </summary> /// <param name="name">The friendly name of the provider.</param> /// <param name="config">A collection of the name/value pairs representing the provider-specific attributes specified in the configuration for this provider.</param> public override void Initialize(string name, NameValueCollection config) { if (config == null) throw new ArgumentNullException("config"); if (string.IsNullOrEmpty(config["description"])) { config.Remove("description"); config.Add("description", "B2C Shop Custom Provider"); } if (string.IsNullOrEmpty(name)) name = "b2c_shop"; if (config["applicationName"] != null && !string.IsNullOrEmpty(config["applicationName"].Trim())) applicationName = config["applicationName"]; base.Initialize(name, config); } /// <summary> /// Returns the collection of settings property values for the specified application instance and settings property group. /// </summary> /// <param name="context">A System.Configuration.SettingsContext describing the current application use.</param> /// <param name="collection">A System.Configuration.SettingsPropertyCollection containing the settings property group whose values are to be retrieved.</param> /// <returns>A System.Configuration.SettingsPropertyValueCollection containing the values for the specified settings property group.</returns> public override SettingsPropertyValueCollection GetPropertyValues(SettingsContext context, SettingsPropertyCollection collection) { string username = (string)context["UserName"]; bool isAuthenticated = (bool)context["IsAuthenticated"]; //if (!isAuthenticated) return null; int uniqueID = dal.GetUniqueID(username, isAuthenticated, false, ApplicationName); SettingsPropertyValueCollection svc = new SettingsPropertyValueCollection(); foreach (SettingsProperty prop in collection) { SettingsPropertyValue pv = new SettingsPropertyValue(prop); switch (pv.Property.Name) { case PROFILE_USER: if (!String.IsNullOrEmpty(username)) { pv.PropertyValue = GetUser(uniqueID); } break; default: throw new ApplicationException(ERR_INVALID_PARAMETER + " name."); } svc.Add(pv); } return svc; } /// <summary> /// Sets the values of the specified group of property settings. /// </summary> /// <param name="context">A System.Configuration.SettingsContext describing the current application usage.</param> /// <param name="collection">A System.Configuration.SettingsPropertyValueCollection representing the group of property settings to set.</param> public override void SetPropertyValues(SettingsContext context, SettingsPropertyValueCollection collection) { string username = (string)context["UserName"]; CheckUserName(username); bool isAuthenticated = (bool)context["IsAuthenticated"]; int uniqueID = dal.GetUniqueID(username, isAuthenticated, false, ApplicationName); if (uniqueID == 0) { uniqueID = dal.CreateProfileForUser(username, isAuthenticated, ApplicationName); } foreach (SettingsPropertyValue pv in collection) { if (pv.PropertyValue != null) { switch (pv.Property.Name) { case PROFILE_USER: SetUser(uniqueID, (UserInfo)pv.PropertyValue); break; default: throw new ApplicationException(ERR_INVALID_PARAMETER + " name."); } } } UpdateActivityDates(username, false); } // Profile gettters // Retrieve UserInfo private static UserInfo GetUser(int userID) { return dal.GetUser(userID); } // Update account info private static void SetUser(int uniqueID, UserInfo user) { user.UserID = uniqueID; dal.SetUser(user); } // UpdateActivityDates // Updates the LastActivityDate and LastUpdatedDate values // when profile properties are accessed by the // GetPropertyValues and SetPropertyValues methods. // Passing true as the activityOnly parameter will update // only the LastActivityDate. private static void UpdateActivityDates(string username, bool activityOnly) { dal.UpdateActivityDates(username, activityOnly, applicationName); } /// <summary> /// Deletes profile properties and information for the supplied list of profiles. /// </summary> /// <param name="profiles">A System.Web.Profile.ProfileInfoCollection of information about profiles that are to be deleted.</param> /// <returns>The number of profiles deleted from the data source.</returns> public override int DeleteProfiles(ProfileInfoCollection profiles) { int deleteCount = 0; foreach (ProfileInfo p in profiles) if (DeleteProfile(p.UserName)) deleteCount++; return deleteCount; } /// <summary> /// Deletes profile properties and information for profiles that match the supplied list of user names. /// </summary> /// <param name="usernames">A string array of user names for profiles to be deleted.</param> /// <returns>The number of profiles deleted from the data source.</returns> public override int DeleteProfiles(string[] usernames) { int deleteCount = 0; foreach (string user in usernames) if (DeleteProfile(user)) deleteCount++; return deleteCount; } // DeleteProfile // Deletes profile data from the database for the specified user name. private static bool DeleteProfile(string username) { CheckUserName(username); return dal.DeleteAnonymousProfile(username, applicationName); } // Verifies user name for sise and comma private static void CheckUserName(string userName) { if (string.IsNullOrEmpty(userName) || userName.Length > 256 || userName.IndexOf(",") > 0) throw new ApplicationException(ERR_INVALID_PARAMETER + " user name."); } /// <summary> /// Deletes all user-profile data for profiles in which the last activity date occurred before the specified date. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are deleted.</param> /// <param name="userInactiveSinceDate">A System.DateTime that identifies which user profiles are considered inactive. If the System.Web.Profile.ProfileInfo.LastActivityDate value of a user profile occurs on or before this date and time, the profile is considered inactive.</param> /// <returns>The number of profiles deleted from the data source.</returns> public override int DeleteInactiveProfiles(ProfileAuthenticationOption authenticationOption, DateTime userInactiveSinceDate) { string[] userArray = new string[0]; dal.GetInactiveProfiles((int)authenticationOption, userInactiveSinceDate, ApplicationName).CopyTo(userArray, 0); return DeleteProfiles(userArray); } /// <summary> /// Retrieves profile information for profiles in which the user name matches the specified user names. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are returned.</param> /// <param name="usernameToMatch">The user name to search for.</param> /// <param name="pageIndex">The index of the page of results to return.</param> /// <param name="pageSize">The size of the page of results to return.</param> /// <param name="totalRecords">When this method returns, contains the total number of profiles.</param> /// <returns>A System.Web.Profile.ProfileInfoCollection containing user-profile information // for profiles where the user name matches the supplied usernameToMatch parameter.</returns> public override ProfileInfoCollection FindProfilesByUserName(ProfileAuthenticationOption authenticationOption, string usernameToMatch, int pageIndex, int pageSize, out int totalRecords) { CheckParameters(pageIndex, pageSize); return GetProfileInfo(authenticationOption, usernameToMatch, null, pageIndex, pageSize, out totalRecords); } /// <summary> /// Retrieves profile information for profiles in which the last activity date occurred on or before the specified date and the user name matches the specified user name. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are returned.</param> /// <param name="usernameToMatch">The user name to search for.</param> /// <param name="userInactiveSinceDate">A System.DateTime that identifies which user profiles are considered inactive. If the System.Web.Profile.ProfileInfo.LastActivityDate value of a user profile occurs on or before this date and time, the profile is considered inactive.</param> /// <param name="pageIndex">The index of the page of results to return.</param> /// <param name="pageSize">The size of the page of results to return.</param> /// <param name="totalRecords">When this method returns, contains the total number of profiles.</param> /// <returns>A System.Web.Profile.ProfileInfoCollection containing user profile information for inactive profiles where the user name matches the supplied usernameToMatch parameter.</returns> public override ProfileInfoCollection FindInactiveProfilesByUserName(ProfileAuthenticationOption authenticationOption, string usernameToMatch, DateTime userInactiveSinceDate, int pageIndex, int pageSize, out int totalRecords) { CheckParameters(pageIndex, pageSize); return GetProfileInfo(authenticationOption, usernameToMatch, userInactiveSinceDate, pageIndex, pageSize, out totalRecords); } /// <summary> /// Retrieves user profile data for all profiles in the data source. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are returned.</param> /// <param name="pageIndex">The index of the page of results to return.</param> /// <param name="pageSize">The size of the page of results to return.</param> /// <param name="totalRecords">When this method returns, contains the total number of profiles.</param> /// <returns>A System.Web.Profile.ProfileInfoCollection containing user-profile information for all profiles in the data source.</returns> public override ProfileInfoCollection GetAllProfiles(ProfileAuthenticationOption authenticationOption, int pageIndex, int pageSize, out int totalRecords) { CheckParameters(pageIndex, pageSize); return GetProfileInfo(authenticationOption, null, null, pageIndex, pageSize, out totalRecords); } /// <summary> /// Retrieves user-profile data from the data source for profiles in which the last activity date occurred on or before the specified date. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are returned.</param> /// <param name="userInactiveSinceDate">A System.DateTime that identifies which user profiles are considered inactive. If the System.Web.Profile.ProfileInfo.LastActivityDate of a user profile occurs on or before this date and time, the profile is considered inactive.</param> /// <param name="pageIndex">The index of the page of results to return.</param> /// <param name="pageSize">The size of the page of results to return.</param> /// <param name="totalRecords">When this method returns, contains the total number of profiles.</param> /// <returns>A System.Web.Profile.ProfileInfoCollection containing user-profile information about the inactive profiles.</returns> public override ProfileInfoCollection GetAllInactiveProfiles(ProfileAuthenticationOption authenticationOption, DateTime userInactiveSinceDate, int pageIndex, int pageSize, out int totalRecords) { CheckParameters(pageIndex, pageSize); return GetProfileInfo(authenticationOption, null, userInactiveSinceDate, pageIndex, pageSize, out totalRecords); } /// <summary> /// Returns the number of profiles in which the last activity date occurred on or before the specified date. /// </summary> /// <param name="authenticationOption">One of the System.Web.Profile.ProfileAuthenticationOption values, specifying whether anonymous, authenticated, or both types of profiles are returned.</param> /// <param name="userInactiveSinceDate">A System.DateTime that identifies which user profiles are considered inactive. If the System.Web.Profile.ProfileInfo.LastActivityDate of a user profile occurs on or before this date and time, the profile is considered inactive.</param> /// <returns>The number of profiles in which the last activity date occurred on or before the specified date.</returns> public override int GetNumberOfInactiveProfiles(ProfileAuthenticationOption authenticationOption, DateTime userInactiveSinceDate) { int inactiveProfiles = 0; ProfileInfoCollection profiles = GetProfileInfo(authenticationOption, null, userInactiveSinceDate, 0, 0, out inactiveProfiles); return inactiveProfiles; } //Verifies input parameters for page size and page index. private static void CheckParameters(int pageIndex, int pageSize) { if (pageIndex < 1 || pageSize < 1) throw new ApplicationException(ERR_INVALID_PARAMETER + " page index."); } //GetProfileInfo //Retrieves a count of profiles and creates a //ProfileInfoCollection from the profile data in the //database. Called by GetAllProfiles, GetAllInactiveProfiles, //FindProfilesByUserName, FindInactiveProfilesByUserName, //and GetNumberOfInactiveProfiles. //Specifying a pageIndex of 0 retrieves a count of the results only. private static ProfileInfoCollection GetProfileInfo(ProfileAuthenticationOption authenticationOption, string usernameToMatch, object userInactiveSinceDate, int pageIndex, int pageSize, out int totalRecords) { ProfileInfoCollection profiles = new ProfileInfoCollection(); totalRecords = 0; // Count profiles only. if (pageSize == 0) return profiles; int counter = 0; int startIndex = pageSize * (pageIndex - 1); int endIndex = startIndex + pageSize - 1; DateTime dt = new DateTime(1900, 1, 1); if (userInactiveSinceDate != null) dt = (DateTime)userInactiveSinceDate; /* foreach(CustomProfileInfo profile in dal.GetProfileInfo((int)authenticationOption, usernameToMatch, dt, applicationName, out totalRecords)) { if(counter >= startIndex) { ProfileInfo p = new ProfileInfo(profile.UserName, profile.IsAnonymous, profile.LastActivityDate, profile.LastUpdatedDate, 0); profiles.Add(p); } if(counter >= endIndex) { break; } counter++; } */ return profiles; } } } This is how I use it in the controller: public ActionResult AddTyreToCart(CartViewModel model) { string profile = Request.IsAuthenticated ? Request.AnonymousID : User.Identity.Name; } I would like to debug: How can 2 users who provide different cookies get the same profileid? EDIT Here is the code for getuniqueid public int GetUniqueID(string userName, bool isAuthenticated, bool ignoreAuthenticationType, string appName) { SqlParameter[] parms = { new SqlParameter("@Username", SqlDbType.VarChar, 256), new SqlParameter("@ApplicationName", SqlDbType.VarChar, 256)}; parms[0].Value = userName; parms[1].Value = appName; if (!ignoreAuthenticationType) { Array.Resize(ref parms, parms.Length + 1); parms[2] = new SqlParameter("@IsAnonymous", SqlDbType.Bit) { Value = !isAuthenticated }; } int userID; object retVal = null; retVal = SqlHelper.ExecuteScalar(ConfigurationManager.ConnectionStrings["SQLOrderB2CConnString"].ConnectionString, CommandType.StoredProcedure, "getProfileUniqueID", parms); if (retVal == null) userID = CreateProfileForUser(userName, isAuthenticated, appName); else userID = Convert.ToInt32(retVal); return userID; } And this is the SP: CREATE PROCEDURE [dbo].[getProfileUniqueID] @Username VarChar( 256), @ApplicationName VarChar( 256), @IsAnonymous bit = null AS BEGIN SET NOCOUNT ON; /* [getProfileUniqueID] created 08.07.2009 mf Retrive unique id for current user */ SELECT UniqueID FROM dbo.Profiles WHERE Username = @Username AND ApplicationName = @ApplicationName AND IsAnonymous = @IsAnonymous or @IsAnonymous = null END

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  • c# Truncate HTML safely for article summary

    - by WickedW
    Hi All, Does anyone have a c# variation of this? This is so I can take some html and display it without breaking as a summary lead in to an article? http://stackoverflow.com/questions/1193500/php-truncate-html-ignoring-tags Save me from reinventing the wheel! Thank you very much ---------- edit ------------------ Sorry, new here, and your right, should have phrased the question better, heres a bit more info I wish to take a html string and truncate it to a set number of words (or even char length) so I can then show the start of it as a summary (which then leads to the main article). I wish to preserve the html so I can show the links etc in preview. The main issue I have to solve is the fact that we may well end up with unclosed html tags if we truncate in the middle of 1 or more tags! The idea I have for solution is to a) truncate the html to N words (words better but chars ok) first (be sure not to stop in the middle of a tag and truncate a require attribute) b) work through the opened html tags in this truncated string (maybe stick them on stack as I go?) c) then work through the closing tags and ensure they match the ones on stack as I pop them off? d) if any open tags left on stack after this, then write them to end of truncated string and html should be good to go!!!! -- edit 12112009 Here is what I have bumbled together so far as a unittest file in VS2008, this 'may' help someone in future My hack attempts based on Jan code are at top for char version + word version (DISCLAIMER: this is dirty rough code!! on my part) I assume working with 'well-formed' HTML in all cases (but not necessarily a full document with a root node as per XML version) Abels XML version is at bottom, but not yet got round to fully getting tests to run on this yet (plus need to understand the code) ... I will update when I get chance to refine having trouble with posting code? is there no upload facility on stack? Thanks for all comments :) using System; using System.Collections.Generic; using System.Text.RegularExpressions; using System.Xml; using System.Xml.XPath; using Microsoft.VisualStudio.TestTools.UnitTesting; namespace PINET40TestProject { [TestClass] public class UtilityUnitTest { public static string TruncateHTMLSafeishChar(string text, int charCount) { bool inTag = false; int cntr = 0; int cntrContent = 0; // loop through html, counting only viewable content foreach (Char c in text) { if (cntrContent == charCount) break; cntr++; if (c == '<') { inTag = true; continue; } if (c == '>') { inTag = false; continue; } if (!inTag) cntrContent++; } string substr = text.Substring(0, cntr); //search for nonclosed tags MatchCollection openedTags = new Regex("<[^/](.|\n)*?>").Matches(substr); MatchCollection closedTags = new Regex("<[/](.|\n)*?>").Matches(substr); // create stack Stack<string> opentagsStack = new Stack<string>(); Stack<string> closedtagsStack = new Stack<string>(); // to be honest, this seemed like a good idea then I got lost along the way // so logic is probably hanging by a thread!! foreach (Match tag in openedTags) { string openedtag = tag.Value.Substring(1, tag.Value.Length - 2); // strip any attributes, sure we can use regex for this! if (openedtag.IndexOf(" ") >= 0) { openedtag = openedtag.Substring(0, openedtag.IndexOf(" ")); } // ignore brs as self-closed if (openedtag.Trim() != "br") { opentagsStack.Push(openedtag); } } foreach (Match tag in closedTags) { string closedtag = tag.Value.Substring(2, tag.Value.Length - 3); closedtagsStack.Push(closedtag); } if (closedtagsStack.Count < opentagsStack.Count) { while (opentagsStack.Count > 0) { string tagstr = opentagsStack.Pop(); if (closedtagsStack.Count == 0 || tagstr != closedtagsStack.Peek()) { substr += "</" + tagstr + ">"; } else { closedtagsStack.Pop(); } } } return substr; } public static string TruncateHTMLSafeishWord(string text, int wordCount) { bool inTag = false; int cntr = 0; int cntrWords = 0; Char lastc = ' '; // loop through html, counting only viewable content foreach (Char c in text) { if (cntrWords == wordCount) break; cntr++; if (c == '<') { inTag = true; continue; } if (c == '>') { inTag = false; continue; } if (!inTag) { // do not count double spaces, and a space not in a tag counts as a word if (c == 32 && lastc != 32) cntrWords++; } } string substr = text.Substring(0, cntr) + " ..."; //search for nonclosed tags MatchCollection openedTags = new Regex("<[^/](.|\n)*?>").Matches(substr); MatchCollection closedTags = new Regex("<[/](.|\n)*?>").Matches(substr); // create stack Stack<string> opentagsStack = new Stack<string>(); Stack<string> closedtagsStack = new Stack<string>(); foreach (Match tag in openedTags) { string openedtag = tag.Value.Substring(1, tag.Value.Length - 2); // strip any attributes, sure we can use regex for this! if (openedtag.IndexOf(" ") >= 0) { openedtag = openedtag.Substring(0, openedtag.IndexOf(" ")); } // ignore brs as self-closed if (openedtag.Trim() != "br") { opentagsStack.Push(openedtag); } } foreach (Match tag in closedTags) { string closedtag = tag.Value.Substring(2, tag.Value.Length - 3); closedtagsStack.Push(closedtag); } if (closedtagsStack.Count < opentagsStack.Count) { while (opentagsStack.Count > 0) { string tagstr = opentagsStack.Pop(); if (closedtagsStack.Count == 0 || tagstr != closedtagsStack.Peek()) { substr += "</" + tagstr + ">"; } else { closedtagsStack.Pop(); } } } return substr; } public static string TruncateHTMLSafeishCharXML(string text, int charCount) { // your data, probably comes from somewhere, or as params to a methodint XmlDocument xml = new XmlDocument(); xml.LoadXml(text); // create a navigator, this is our primary tool XPathNavigator navigator = xml.CreateNavigator(); XPathNavigator breakPoint = null; // find the text node we need: while (navigator.MoveToFollowing(XPathNodeType.Text)) { string lastText = navigator.Value.Substring(0, Math.Min(charCount, navigator.Value.Length)); charCount -= navigator.Value.Length; if (charCount <= 0) { // truncate the last text. Here goes your "search word boundary" code: navigator.SetValue(lastText); breakPoint = navigator.Clone(); break; } } // first remove text nodes, because Microsoft unfortunately merges them without asking while (navigator.MoveToFollowing(XPathNodeType.Text)) { if (navigator.ComparePosition(breakPoint) == XmlNodeOrder.After) { navigator.DeleteSelf(); } } // moves to parent, then move the rest navigator.MoveTo(breakPoint); while (navigator.MoveToFollowing(XPathNodeType.Element)) { if (navigator.ComparePosition(breakPoint) == XmlNodeOrder.After) { navigator.DeleteSelf(); } } // moves to parent // then remove *all* empty nodes to clean up (not necessary): // TODO, add empty elements like <br />, <img /> as exclusion navigator.MoveToRoot(); while (navigator.MoveToFollowing(XPathNodeType.Element)) { while (!navigator.HasChildren && (navigator.Value ?? "").Trim() == "") { navigator.DeleteSelf(); } } // moves to parent navigator.MoveToRoot(); return navigator.InnerXml; } [TestMethod] public void TestTruncateHTMLSafeish() { // Case where we just make it to start of HREF (so effectively an empty link) // 'simple' nested none attributed tags Assert.AreEqual(@"<h1>1234</h1><b><i>56789</i>012</b>", TruncateHTMLSafeishChar( @"<h1>1234</h1><b><i>56789</i>012345</b>", 12)); // In middle of a! Assert.AreEqual(@"<h1>1234</h1><a href=""testurl""><b>567</b></a>", TruncateHTMLSafeishChar( @"<h1>1234</h1><a href=""testurl""><b>5678</b></a><i><strong>some italic nested in string</strong></i>", 7)); // more Assert.AreEqual(@"<div><b><i><strong>1</strong></i></b></div>", TruncateHTMLSafeishChar( @"<div><b><i><strong>12</strong></i></b></div>", 1)); // br Assert.AreEqual(@"<h1>1 3 5</h1><br />6", TruncateHTMLSafeishChar( @"<h1>1 3 5</h1><br />678<br />", 6)); } [TestMethod] public void TestTruncateHTMLSafeishWord() { // zero case Assert.AreEqual(@" ...", TruncateHTMLSafeishWord( @"", 5)); // 'simple' nested none attributed tags Assert.AreEqual(@"<h1>one two <br /></h1><b><i>three ...</i></b>", TruncateHTMLSafeishWord( @"<h1>one two <br /></h1><b><i>three </i>four</b>", 3), "we have added ' ...' to end of summary"); // In middle of a! Assert.AreEqual(@"<h1>one two three </h1><a href=""testurl""><b class=""mrclass"">four ...</b></a>", TruncateHTMLSafeishWord( @"<h1>one two three </h1><a href=""testurl""><b class=""mrclass"">four five </b></a><i><strong>some italic nested in string</strong></i>", 4)); // start of h1 Assert.AreEqual(@"<h1>one two three ...</h1>", TruncateHTMLSafeishWord( @"<h1>one two three </h1><a href=""testurl""><b>four five </b></a><i><strong>some italic nested in string</strong></i>", 3)); // more than words available Assert.AreEqual(@"<h1>one two three </h1><a href=""testurl""><b>four five </b></a><i><strong>some italic nested in string</strong></i> ...", TruncateHTMLSafeishWord( @"<h1>one two three </h1><a href=""testurl""><b>four five </b></a><i><strong>some italic nested in string</strong></i>", 99)); } [TestMethod] public void TestTruncateHTMLSafeishWordXML() { // zero case Assert.AreEqual(@" ...", TruncateHTMLSafeishWord( @"", 5)); // 'simple' nested none attributed tags string output = TruncateHTMLSafeishCharXML( @"<body><h1>one two </h1><b><i>three </i>four</b></body>", 13); Assert.AreEqual(@"<body>\r\n <h1>one two </h1>\r\n <b>\r\n <i>three</i>\r\n </b>\r\n</body>", output, "XML version, no ... yet and addeds '\r\n + spaces?' to format document"); // In middle of a! Assert.AreEqual(@"<h1>one two three </h1><a href=""testurl""><b class=""mrclass"">four ...</b></a>", TruncateHTMLSafeishCharXML( @"<body><h1>one two three </h1><a href=""testurl""><b class=""mrclass"">four five </b></a><i><strong>some italic nested in string</strong></i></body>", 4)); // start of h1 Assert.AreEqual(@"<h1>one two three ...</h1>", TruncateHTMLSafeishCharXML( @"<h1>one two three </h1><a href=""testurl""><b>four five </b></a><i><strong>some italic nested in string</strong></i>", 3)); // more than words available Assert.AreEqual(@"<h1>one two three </h1><a href=""testurl""><b>four five </b></a><i><strong>some italic nested in string</strong></i> ...", TruncateHTMLSafeishCharXML( @"<h1>one two three </h1><a href=""testurl""><b>four five </b></a><i><strong>some italic nested in string</strong></i>", 99)); } } }

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  • Re: Help with Boost Grammar

    - by Decmac04
    I have redesigned and extended the grammar I asked about earlier as shown below: // BIFAnalyser.cpp : Defines the entry point for the console application. // // /*============================================================================= Copyright (c) Temitope Jos Onunkun 2010 http://www.dcs.kcl.ac.uk/pg/onun/ Use, modification and distribution is subject to the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) =============================================================================*/ //////////////////////////////////////////////////////////////////////////// // // // B Machine parser using the Boost "Grammar" and "Semantic Actions". // // // //////////////////////////////////////////////////////////////////////////// include include include include include include //////////////////////////////////////////////////////////////////////////// using namespace std; using namespace boost::spirit; //////////////////////////////////////////////////////////////////////////// // // Semantic Actions // //////////////////////////////////////////////////////////////////////////// // // namespace { //semantic action function on individual lexeme void do_noint(char const* start, char const* end) { string str(start, end); if (str != "NAT1") cout << "PUSH(" << str << ')' << endl; } //semantic action function on addition of lexemes void do_add(char const*, char const*) { cout << "ADD" << endl; // for(vector::iterator vi = strVect.begin(); vi < strVect.end(); ++vi) // cout << *vi << " "; } //semantic action function on subtraction of lexemes void do_subt(char const*, char const*) { cout << "SUBTRACT" << endl; } //semantic action function on multiplication of lexemes void do_mult(char const*, char const*) { cout << "\nMULTIPLY" << endl; } //semantic action function on division of lexemes void do_div(char const*, char const*) { cout << "\nDIVIDE" << endl; } // // vector flowTable; //semantic action function on simple substitution void do_sSubst(char const* start, char const* end) { string str(start, end); //use boost tokenizer to break down tokens typedef boost::tokenizer Tokenizer; boost::char_separator sep(" -+/*:=()",0,boost::drop_empty_tokens); // char separator definition Tokenizer tok(str, sep); Tokenizer::iterator tok_iter = tok.begin(); pair dependency; //create a pair object for dependencies //create a vector object to store all tokens vector dx; // int counter = 0; // tracks token position for(tok.begin(); tok_iter != tok.end(); ++tok_iter) //save all tokens in vector { dx.push_back(*tok_iter ); } counter = dx.size(); // vector d_hat; //stores set of dependency pairs string dep; //pairs variables as string object // dependency.first = *tok.begin(); vector FV; for(int unsigned i=1; i < dx.size(); i++) { // if(!atoi(dx.at(i).c_str()) && (dx.at(i) !=" ")) { dependency.second = dx.at(i); dep = dependency.first + "|-" + dependency.second + " "; d_hat.push_back(dep); vector<string> row; row.push_back(dependency.first); //push x_hat into first column of each row for(unsigned int j=0; j<2; j++) { row.push_back(dependency.second);//push an element (column) into the row } flowTable.push_back(row); //Add the row to the main vector } } //displays internal representation of information flow table cout << "\n****************\nDependency Table\n****************\n"; cout << "X_Hat\tDx\tG_Hat\n"; cout << "-----------------------------\n"; for(unsigned int i=0; i < flowTable.size(); i++) { for(unsigned int j=0; j<2; j++) { cout << flowTable[i][j] << "\t "; } if (*tok.begin() != "WHILE" ) //if there are no global flows, cout << "\t{}"; //display empty set cout << "\n"; } cout << "***************\n\n"; for(int unsigned j=0; j < FV.size(); j++) { if(FV.at(j) != dependency.second) dep = dependency.first + "|-" + dependency.second + " "; d_hat.push_back(dep); } cout << "PUSH(" << str << ')' << endl; cout << "\n*******\nDependency pairs\n*******\n"; for(int unsigned i=0; i < d_hat.size(); i++) cout << d_hat.at(i) << "\n...\n"; cout << "\nSIMPLE SUBSTITUTION\n\n"; } //semantic action function on multiple substitution void do_mSubst(char const* start, char const* end) { string str(start, end); cout << "PUSH(" << str << ')' << endl; //cout << "\nMULTIPLE SUBSTITUTION\n\n"; } //semantic action function on unbounded choice substitution void do_mChoice(char const* start, char const* end) { string str(start, end); cout << "PUSH(" << str << ')' << endl; cout << "\nUNBOUNDED CHOICE SUBSTITUTION\n\n"; } void do_logicExpr(char const* start, char const* end) { string str(start, end); //use boost tokenizer to break down tokens typedef boost::tokenizer Tokenizer; boost::char_separator sep(" -+/*=:()<",0,boost::drop_empty_tokens); // char separator definition Tokenizer tok(str, sep); Tokenizer::iterator tok_iter = tok.begin(); //pair dependency; //create a pair object for dependencies //create a vector object to store all tokens vector dx; for(tok.begin(); tok_iter != tok.end(); ++tok_iter) //save all tokens in vector { dx.push_back(*tok_iter ); } for(unsigned int i=0; i cout << "PUSH(" << str << ')' << endl; cout << "\nPREDICATE\n\n"; } void do_predicate(char const* start, char const* end) { string str(start, end); cout << "PUSH(" << str << ')' << endl; cout << "\nMULTIPLE PREDICATE\n\n"; } void do_ifSelectPre(char const* start, char const* end) { string str(start, end); //if cout << "PUSH(" << str << ')' << endl; cout << "\nPROTECTED SUBSTITUTION\n\n"; } //semantic action function on machine substitution void do_machSubst(char const* start, char const* end) { string str(start, end); cout << "PUSH(" << str << ')' << endl; cout << "\nMACHINE SUBSTITUTION\n\n"; } } //////////////////////////////////////////////////////////////////////////// // // Machine Substitution Grammar // //////////////////////////////////////////////////////////////////////////// // Simple substitution grammar parser with integer values removed struct Substitution : public grammar { template struct definition { definition(Substitution const& ) { machine_subst = ( (simple_subst) | (multi_subst) | (if_select_pre_subst) | (unbounded_choice) )[&do_machSubst] ; unbounded_choice = str_p("ANY") ide_list str_p("WHERE") predicate str_p("THEN") machine_subst str_p("END") ; if_select_pre_subst = ( ( str_p("IF") predicate str_p("THEN") machine_subst *( str_p("ELSIF") predicate machine_subst ) !( str_p("ELSE") machine_subst) str_p("END") ) | ( str_p("SELECT") predicate str_p("THEN") machine_subst *( str_p("WHEN") predicate machine_subst ) !( str_p("ELSE") machine_subst) str_p("END")) | ( str_p("PRE") predicate str_p("THEN") machine_subst str_p("END") ) )[&do_ifSelectPre] ; multi_subst = ( (machine_subst) *( ( str_p("||") (machine_subst) ) | ( str_p("[]") (machine_subst) ) ) ) [&do_mSubst] ; simple_subst = (identifier str_p(":=") arith_expr) [&do_sSubst] ; expression = predicate | arith_expr ; predicate = ( (logic_expr) *( ( ch_p('&') (logic_expr) ) | ( str_p("OR") (logic_expr) ) ) )[&do_predicate] ; logic_expr = ( identifier (str_p("<") arith_expr) | (str_p("<") arith_expr) | (str_p("/:") arith_expr) | (str_p("<:") arith_expr) | (str_p("/<:") arith_expr) | (str_p("<<:") arith_expr) | (str_p("/<<:") arith_expr) | (str_p("<=") arith_expr) | (str_p("=") arith_expr) | (str_p("=") arith_expr) | (str_p("=") arith_expr) ) [&do_logicExpr] ; arith_expr = term *( ('+' term)[&do_add] | ('-' term)[&do_subt] ) ; term = factor ( ('' factor)[&do_mult] | ('/' factor)[&do_div] ) ; factor = lexeme_d[( identifier | +digit_p)[&do_noint]] | '(' expression ')' | ('+' factor) ; ide_list = identifier *( ch_p(',') identifier ) ; identifier = alpha_p +( alnum_p | ch_p('_') ) ; } rule machine_subst, unbounded_choice, if_select_pre_subst, multi_subst, simple_subst, expression, predicate, logic_expr, arith_expr, term, factor, ide_list, identifier; rule<ScannerT> const& start() const { return predicate; //return multi_subst; //return machine_subst; } }; }; //////////////////////////////////////////////////////////////////////////// // // Main program // //////////////////////////////////////////////////////////////////////////// int main() { cout << "*********************************\n\n"; cout << "\t\t...Machine Parser...\n\n"; cout << "*********************************\n\n"; // cout << "Type an expression...or [q or Q] to quit\n\n"; string str; int machineCount = 0; char strFilename[256]; //file name store as a string object do { cout << "Please enter a filename...or [q or Q] to quit:\n\n "; //prompt for file name to be input //char strFilename[256]; //file name store as a string object cin strFilename; if(*strFilename == 'q' || *strFilename == 'Q') //termination condition return 0; ifstream inFile(strFilename); // opens file object for reading //output file for truncated machine (operations only) if (inFile.fail()) cerr << "\nUnable to open file for reading.\n" << endl; inFile.unsetf(std::ios::skipws); Substitution elementary_subst; // Simple substitution parser object string next; while (inFile str) { getline(inFile, next); str += next; if (str.empty() || str[0] == 'q' || str[0] == 'Q') break; parse_info< info = parse(str.c_str(), elementary_subst !end_p, space_p); if (info.full) { cout << "\n-------------------------\n"; cout << "Parsing succeeded\n"; cout << "\n-------------------------\n"; } else { cout << "\n-------------------------\n"; cout << "Parsing failed\n"; cout << "stopped at: " << info.stop << "\"\n"; cout << "\n-------------------------\n"; } } } while ( (*strFilename != 'q' || *strFilename !='Q')); return 0; } However, I am experiencing the following unexpected behaviours on testing: The text files I used are: f1.txt, ... containing ...: debt:=(LoanRequest+outstandingLoan1)*20 . f2.txt, ... containing ...: debt:=(LoanRequest+outstandingLoan1)*20 || newDebt := loanammount-paidammount || price := purchasePrice + overhead + bb . f3.txt, ... containing ...: yy < (xx+7+ww) . f4.txt, ... containing ...: yy < (xx+7+ww) & yy : NAT . When I use multi_subst as start rule both files (f1 and f2) are parsed correctly; When I use machine_subst as start rule file f1 parse correctly, while file f2 fails, producing the error: “Parsing failed stopped at: || newDebt := loanammount-paidammount || price := purchasePrice + overhead + bb” When I use predicate as start symbol, file f3 parse correctly, but file f4 yields the error: “ “Parsing failed stopped at: & yy : NAT” Can anyone help with the grammar, please? It appears there are problems with the grammar that I have so far been unable to spot.

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  • Using an alternate JSON Serializer in ASP.NET Web API

    - by Rick Strahl
    The new ASP.NET Web API that Microsoft released alongside MVC 4.0 Beta last week is a great framework for building REST and AJAX APIs. I've been working with it for quite a while now and I really like the way it works and the complete set of features it provides 'in the box'. It's about time that Microsoft gets a decent API for building generic HTTP endpoints into the framework. DataContractJsonSerializer sucks As nice as Web API's overall design is one thing still sucks: The built-in JSON Serialization uses the DataContractJsonSerializer which is just too limiting for many scenarios. The biggest issues I have with it are: No support for untyped values (object, dynamic, Anonymous Types) MS AJAX style Date Formatting Ugly serialization formats for types like Dictionaries To me the most serious issue is dealing with serialization of untyped objects. I have number of applications with AJAX front ends that dynamically reformat data from business objects to fit a specific message format that certain UI components require. The most common scenario I have there are IEnumerable query results from a database with fields from the result set rearranged to fit the sometimes unconventional formats required for the UI components (like jqGrid for example). Creating custom types to fit these messages seems like overkill and projections using Linq makes this much easier to code up. Alas DataContractJsonSerializer doesn't support it. Neither does DataContractSerializer for XML output for that matter. What this means is that you can't do stuff like this in Web API out of the box:public object GetAnonymousType() { return new { name = "Rick", company = "West Wind", entered= DateTime.Now }; } Basically anything that doesn't have an explicit type DataContractJsonSerializer will not let you return. FWIW, the same is true for XmlSerializer which also doesn't work with non-typed values for serialization. The example above is obviously contrived with a hardcoded object graph, but it's not uncommon to get dynamic values returned from queries that have anonymous types for their result projections. Apparently there's a good possibility that Microsoft will ship Json.NET as part of Web API RTM release.  Scott Hanselman confirmed this as a footnote in his JSON Dates post a few days ago. I've heard several other people from Microsoft confirm that Json.NET will be included and be the default JSON serializer, but no details yet in what capacity it will show up. Let's hope it ends up as the default in the box. Meanwhile this post will show you how you can use it today with the beta and get JSON that matches what you should see in the RTM version. What about JsonValue? To be fair Web API DOES include a new JsonValue/JsonObject/JsonArray type that allow you to address some of these scenarios. JsonValue is a new type in the System.Json assembly that can be used to build up an object graph based on a dictionary. It's actually a really cool implementation of a dynamic type that allows you to create an object graph and spit it out to JSON without having to create .NET type first. JsonValue can also receive a JSON string and parse it without having to actually load it into a .NET type (which is something that's been missing in the core framework). This is really useful if you get a JSON result from an arbitrary service and you don't want to explicitly create a mapping type for the data returned. For serialization you can create an object structure on the fly and pass it back as part of an Web API action method like this:public JsonValue GetJsonValue() { dynamic json = new JsonObject(); json.name = "Rick"; json.company = "West Wind"; json.entered = DateTime.Now; dynamic address = new JsonObject(); address.street = "32 Kaiea"; address.zip = "96779"; json.address = address; dynamic phones = new JsonArray(); json.phoneNumbers = phones; dynamic phone = new JsonObject(); phone.type = "Home"; phone.number = "808 123-1233"; phones.Add(phone); phone = new JsonObject(); phone.type = "Home"; phone.number = "808 123-1233"; phones.Add(phone); //var jsonString = json.ToString(); return json; } which produces the following output (formatted here for easier reading):{ name: "rick", company: "West Wind", entered: "2012-03-08T15:33:19.673-10:00", address: { street: "32 Kaiea", zip: "96779" }, phoneNumbers: [ { type: "Home", number: "808 123-1233" }, { type: "Mobile", number: "808 123-1234" }] } If you need to build a simple JSON type on the fly these types work great. But if you have an existing type - or worse a query result/list that's already formatted JsonValue et al. become a pain to work with. As far as I can see there's no way to just throw an object instance at JsonValue and have it convert into JsonValue dictionary. It's a manual process. Using alternate Serializers in Web API So, currently the default serializer in WebAPI is DataContractJsonSeriaizer and I don't like it. You may not either, but luckily you can swap the serializer fairly easily. If you'd rather use the JavaScriptSerializer built into System.Web.Extensions or Json.NET today, it's not too difficult to create a custom MediaTypeFormatter that uses these serializers and can replace or partially replace the native serializer. Here's a MediaTypeFormatter implementation using the ASP.NET JavaScriptSerializer:using System; using System.Net.Http.Formatting; using System.Threading.Tasks; using System.Web.Script.Serialization; using System.Json; using System.IO; namespace Westwind.Web.WebApi { public class JavaScriptSerializerFormatter : MediaTypeFormatter { public JavaScriptSerializerFormatter() { SupportedMediaTypes.Add(new System.Net.Http.Headers.MediaTypeHeaderValue("application/json")); } protected override bool CanWriteType(Type type) { // don't serialize JsonValue structure use default for that if (type == typeof(JsonValue) || type == typeof(JsonObject) || type== typeof(JsonArray) ) return false; return true; } protected override bool CanReadType(Type type) { if (type == typeof(IKeyValueModel)) return false; return true; } protected override System.Threading.Tasks.Taskobject OnReadFromStreamAsync(Type type, System.IO.Stream stream, System.Net.Http.Headers.HttpContentHeaders contentHeaders, FormatterContext formatterContext) { var task = Taskobject.Factory.StartNew(() = { var ser = new JavaScriptSerializer(); string json; using (var sr = new StreamReader(stream)) { json = sr.ReadToEnd(); sr.Close(); } object val = ser.Deserialize(json,type); return val; }); return task; } protected override System.Threading.Tasks.Task OnWriteToStreamAsync(Type type, object value, System.IO.Stream stream, System.Net.Http.Headers.HttpContentHeaders contentHeaders, FormatterContext formatterContext, System.Net.TransportContext transportContext) { var task = Task.Factory.StartNew( () = { var ser = new JavaScriptSerializer(); var json = ser.Serialize(value); byte[] buf = System.Text.Encoding.Default.GetBytes(json); stream.Write(buf,0,buf.Length); stream.Flush(); }); return task; } } } Formatter implementation is pretty simple: You override 4 methods to tell which types you can handle and then handle the input or output streams to create/parse the JSON data. Note that when creating output you want to take care to still allow JsonValue/JsonObject/JsonArray types to be handled by the default serializer so those objects serialize properly - if you let either JavaScriptSerializer or JSON.NET handle them they'd try to render the dictionaries which is very undesirable. If you'd rather use Json.NET here's the JSON.NET version of the formatter:// this code requires a reference to JSON.NET in your project #if true using System; using System.Net.Http.Formatting; using System.Threading.Tasks; using System.Web.Script.Serialization; using System.Json; using Newtonsoft.Json; using System.IO; using Newtonsoft.Json.Converters; namespace Westwind.Web.WebApi { public class JsonNetFormatter : MediaTypeFormatter { public JsonNetFormatter() { SupportedMediaTypes.Add(new System.Net.Http.Headers.MediaTypeHeaderValue("application/json")); } protected override bool CanWriteType(Type type) { // don't serialize JsonValue structure use default for that if (type == typeof(JsonValue) || type == typeof(JsonObject) || type == typeof(JsonArray)) return false; return true; } protected override bool CanReadType(Type type) { if (type == typeof(IKeyValueModel)) return false; return true; } protected override System.Threading.Tasks.Taskobject OnReadFromStreamAsync(Type type, System.IO.Stream stream, System.Net.Http.Headers.HttpContentHeaders contentHeaders, FormatterContext formatterContext) { var task = Taskobject.Factory.StartNew(() = { var settings = new JsonSerializerSettings() { NullValueHandling = NullValueHandling.Ignore, }; var sr = new StreamReader(stream); var jreader = new JsonTextReader(sr); var ser = new JsonSerializer(); ser.Converters.Add(new IsoDateTimeConverter()); object val = ser.Deserialize(jreader, type); return val; }); return task; } protected override System.Threading.Tasks.Task OnWriteToStreamAsync(Type type, object value, System.IO.Stream stream, System.Net.Http.Headers.HttpContentHeaders contentHeaders, FormatterContext formatterContext, System.Net.TransportContext transportContext) { var task = Task.Factory.StartNew( () = { var settings = new JsonSerializerSettings() { NullValueHandling = NullValueHandling.Ignore, }; string json = JsonConvert.SerializeObject(value, Formatting.Indented, new JsonConverter[1] { new IsoDateTimeConverter() } ); byte[] buf = System.Text.Encoding.Default.GetBytes(json); stream.Write(buf,0,buf.Length); stream.Flush(); }); return task; } } } #endif   One advantage of the Json.NET serializer is that you can specify a few options on how things are formatted and handled. You get null value handling and you can plug in the IsoDateTimeConverter which is nice to product proper ISO dates that I would expect any Json serializer to output these days. Hooking up the Formatters Once you've created the custom formatters you need to enable them for your Web API application. To do this use the GlobalConfiguration.Configuration object and add the formatter to the Formatters collection. Here's what this looks like hooked up from Application_Start in a Web project:protected void Application_Start(object sender, EventArgs e) { // Action based routing (used for RPC calls) RouteTable.Routes.MapHttpRoute( name: "StockApi", routeTemplate: "stocks/{action}/{symbol}", defaults: new { symbol = RouteParameter.Optional, controller = "StockApi" } ); // WebApi Configuration to hook up formatters and message handlers // optional RegisterApis(GlobalConfiguration.Configuration); } public static void RegisterApis(HttpConfiguration config) { // Add JavaScriptSerializer formatter instead - add at top to make default //config.Formatters.Insert(0, new JavaScriptSerializerFormatter()); // Add Json.net formatter - add at the top so it fires first! // This leaves the old one in place so JsonValue/JsonObject/JsonArray still are handled config.Formatters.Insert(0, new JsonNetFormatter()); } One thing to remember here is the GlobalConfiguration object which is Web API's static configuration instance. I think this thing is seriously misnamed given that GlobalConfiguration could stand for anything and so is hard to discover if you don't know what you're looking for. How about WebApiConfiguration or something more descriptive? Anyway, once you know what it is you can use the Formatters collection to insert your custom formatter. Note that I insert my formatter at the top of the list so it takes precedence over the default formatter. I also am not removing the old formatter because I still want JsonValue/JsonObject/JsonArray to be handled by the default serialization mechanism. Since they process in sequence and I exclude processing for these types JsonValue et al. still get properly serialized/deserialized. Summary Currently DataContractJsonSerializer in Web API is a pain, but at least we have the ability with relatively limited effort to replace the MediaTypeFormatter and plug in our own JSON serializer. This is useful for many scenarios - if you have existing client applications that used MVC JsonResult or ASP.NET AJAX results from ASMX AJAX services you can plug in the JavaScript serializer and get exactly the same serializer you used in the past so your results will be the same and don't potentially break clients. JSON serializers do vary a bit in how they serialize some of the more complex types (like Dictionaries and dates for example) and so if you're migrating it might be helpful to ensure your client code doesn't break when you switch to ASP.NET Web API. Going forward it looks like Microsoft is planning on plugging in Json.Net into Web API and make that the default. I think that's an awesome choice since Json.net has been around forever, is fast and easy to use and provides a ton of functionality as part of this great library. I just wish Microsoft would have figured this out sooner instead of now at the last minute integrating with it especially given that Json.Net has a similar set of lower level JSON objects JsonValue/JsonObject etc. which now will end up being duplicated by the native System.Json stuff. It's not like we don't already have enough confusion regarding which JSON serializer to use (JavaScriptSerializer, DataContractJsonSerializer, JsonValue/JsonObject/JsonArray and now Json.net). For years I've been using my own JSON serializer because the built in choices are both limited. However, with an official encorsement of Json.Net I'm happily moving on to use that in my applications. Let's see and hope Microsoft gets this right before ASP.NET Web API goes gold.© Rick Strahl, West Wind Technologies, 2005-2012Posted in Web Api  AJAX  ASP.NET   Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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