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• Virtual Technology Summit Series

  - by CassandraClark-OTN

  The Oracle Technology Network (OTN) is excited to invite you to our first Virtual Technology Summit Series.   Learn first hand from Oracle ACEs, Java Champions, and Oracle product experts, as they share their insight and expertise on using Oracle technologies to meet today’s IT challenges. We are offering three chances to watch and interact with Oracle and community experts.  Register Now by clicking one of the links below! Americas - Wednesday July 9th - 9am to 1pm PT / 12pm to 4pm  ET / 1 to 5 pm BRT EMEA – Thursday July 10th / 9am to 1pm BST / 10am – 2pm CET / 12pm to 4pm MSK / GST APAC English – July 16th / IST – 10:00am / SG – 12:30pm / AEST – 2:30pm ??These interactive, online events offer four technical tracks, each with a unique focus on specific tools, technologies, and tips in these focus areas: Java - Big Trends and Technologies - Java lets you mine Big Data, build robust apps with HTML5, JavaScript and Java EE, and expand into the Internet of Things. Experts will present and you’ll be able to chat with them live online. Don’t miss out on this great opportunity to learn from some of the best minds in the Java community. Systems – OS Tips and Tricks for Sysadmins – Learn first hand how to configure Oracle Linux to run Oracle Database 11g and 12c, how to use the latest networking capabilities in Oracle Solaris 11, and how to troubleshoot networking problems in Unix and Linux systems. Database - Mastering Oracle Database Management & Development Techniques – Oracle ACEs and product team experts will present advanced features and management methods that will help you master your Oracle Database capabilities and drive greater performance, agility and manageability of your IT implementation. This track will build upon your skills with data management, migration, and performance. Middleware - The Architecture of Analytics: Big Time Big Data and Business Intelligence – This track will present a solution architect’s perspective on how business intelligence products in Oracle’s Fusion Middleware family and beyond fit into an effective big data architecture, and present insight and expertise from Oracle ACEs specializing in business Intelligence to help you meet your big data business intelligence challenges.

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• Make a basic running sprite effect

  - by PhaDaPhunk

  I'm building my very first game with XNA and i'm trying to get my sprite to run. Everything is working fine for the first sprite. E.g : if I go right(D) my sprite is looking right , if I go left(A) my sprite is looking left and if I don't touch anything my sprite is the default one. Now what I want to do is if the sprite goes Right, i want to alternatively change sprites (left leg, right leg, left leg etc..) xCurrent is the current sprite drawn xRunRight is the first running Sprite and xRunRight1 is the one that have to exchange with xRunRight while running right. This is what I have now : protected override void Update(GameTime gameTime) { float timer = 0f; float interval = 50f; bool frame1 = false ; bool frame2 = false; bool running = false; KeyboardState FaKeyboard = Keyboard.GetState(); // Allows the game to exit if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed) this.Exit(); if ((FaKeyboard.IsKeyUp(Keys.A)) || (FaKeyboard.IsKeyUp(Keys.D))) { xCurrent = xDefault; } if (FaKeyboard.IsKeyDown(Keys.D)) { timer += (float)gameTime.ElapsedGameTime.TotalMilliseconds; if (timer > interval) { if (frame1) { xCurrent = xRunRight; frame1 = false; } else { xCurrent = xRunRight1; frame1 = true; } } xPosition += xDeplacement; } Any ideas...? I've been stuck on this for a while.. Thanks in advance and let me know if you need any other part from the code.

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• Context switches much slower in new linux kernels

  - by Michael Goldshteyn

  We are looking to upgrade the OS on our servers from Ubuntu 10.04 LTS to Ubuntu 12.04 LTS. Unfortunately, it seems that the latency to run a thread that has become runnable has significantly increased from the 2.6 kernel to the 3.2 kernel. In fact the latency numbers we are getting are hard to believe. Let me be more specific about the test. We have a program that has two threads. The first thread gets the current time (in ticks using RDTSC) and then signals a condition variable once a second. The second thread waits on the condition variable and wakes up when it is signaled. It then gets the current time (in ticks using RDTSC). The difference between the time in the second thread and the time in the first thread is computed and displayed on the console. After this the second thread waits on the condition variable once more. So, we get a thread to thread signaling latency measurement once a second as a result. In linux 2.6.32, this latency is somewhere on the order of 2.8-3.5 us, which is reasonable. In linux 3.2.0, this latency is somewhere on the order of 40-100 us. I have excluded any differences in hardware between the two host hosts. They run on identical hardware (dual socket X5687 {Westmere-EP} processors running at 3.6 GHz with hyperthreading, speedstep and all C states turned off). We are changing the affinity to run both threads on physical cores of the same socket (i.e., the first thread is run on Core 0 and the second thread is run on Core 1), so there is no bouncing of threads on cores or bouncing/communication between sockets. The only difference between the two hosts is that one is running Ubuntu 10.04 LTS with kernel 2.6.32-28 (the fast context switch box) and the other is running the latest Ubuntu 12.04 LTS with kernel 3.2.0-23 (the slow context switch box). Have there been any changes in the kernel that could account for this ridiculous slow down in how long it takes for a thread to be scheduled to run?

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• Black Screen after installing recommended Nvidia drivers. What to do?

  - by former_Windows_user

  New to Ubuntu. Problem description: Until recently I had Windows on my computer. My hard disk is divided into two partitions. On the first one (app. 10 GB) I had my Windows XP On the second one (app. 30 GB) I have some data I tried to install Ubuntu 12.04 on the first partition (the smaller one). Since I wanted to keep the data on my second partition, I chose the third install option. During the installation process I deleted the data on partition one, created a new partition with the same size, formatted it as ext4 and mounted / on it. The installation continued fine and at the end I restarted and took the CD out when it ejected automatically (it could have been also before the restart). Ubuntu started but I noticed that my computer was slow. Then a prompt appeared telling me that I did not have the optimal NVidia drivers and recommended to install a specific one. I clicked on the recommended driver, installation went apparently just fine and at the end I had to restart the system again. I did it, Ubuntu started, asked for my password, I typed it, pressed Enter, the screen turned black and remained like that (only the cursor was there and I could move it). I restarted and the same thing happened again. Has anyone had such a problem before and was able to solve it? With Windows I always installed drivers from CDs after installing Windows. Are the same CDs going to work for Ubuntu too or I should find special drivers? P.S. During the installation I was connected to the internet and I agreed on installing updates and the third party software. In the time before I installed that problematic but recommended NVidia driver I checked that there was between 6 and 7 GB free space on the first partition where I installed Ubuntu.

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• FreeType2 Bitmap to System::Drawing::Bitmap.

  - by Dennis Roche

  Hi, I'm trying to convert a FreeType2 bitmap to a System::Drawing::Bitmap in C++/CLI. FT_Bitmap has a unsigned char* buffer that contains the data to write. I have got somewhat working save it disk as a *.tga, but when saving as *.bmp it renders incorrectly. I believe that the size of byte[] is incorrect and that my data is truncated. Any hints/tips/ideas on what is going on here would be greatly appreciated. Links to articles explaining byte layout and pixel formats etc. would be helpful. Thanks!! C++/CLI code. FT_Bitmap *bitmap = &face->glyph->bitmap; int width = (face->bitmap->metrics.width / 64); int height = (face->bitmap->metrics.height / 64); // must be aligned on a 32 bit boundary or 4 bytes int depth = 8; int stride = ((width * depth + 31) & ~31) >> 3; int bytes = (int)(stride * height); // as *.tga void *buffer = bytes ? malloc(bytes) : NULL; if (buffer) { memset(buffer, 0, bytes); for (int i = 0; i < glyph->rows; ++i) memcpy((char *)buffer + (i * width), glyph->buffer + (i * glyph->pitch), glyph->pitch); WriteTGA("Test.tga", buffer, width, height); } array<Byte>^ values = gcnew array<Byte>(bytes); Marshal::Copy((IntPtr)glyph->buffer, values, 0, bytes); // as *.bmp Bitmap^ systemBitmap = gcnew Bitmap(width, height, PixelFormat::Format24bppRgb); // create bitmap data, lock pixels to be written. BitmapData^ bitmapData = systemBitmap->LockBits(Rectangle(0, 0, width, height), ImageLockMode::WriteOnly, bitmap->PixelFormat); Marshal::Copy(values, 0, bitmapData->Scan0, bytes); systemBitmap->UnlockBits(bitmapData); systemBitmap->Save("Test.bmp"); Reference, FT_Bitmap typedef struct FT_Bitmap_ { int rows; int width; int pitch; unsigned char* buffer; short num_grays; char pixel_mode; char palette_mode; void* palette; } FT_Bitmap; Reference, WriteTGA bool WriteTGA(const char *filename, void *pxl, uint16 width, uint16 height) { FILE *fp = NULL; fopen_s(&fp, filename, "wb"); if (fp) { TGAHeader header; memset(&header, 0, sizeof(TGAHeader)); header.imageType = 3; header.width = width; header.height = height; header.depth = 8; header.descriptor = 0x20; fwrite(&header, sizeof(header), 1, fp); fwrite(pxl, sizeof(uint8) * width * height, 1, fp); fclose(fp); return true; } return false; }

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• Help with infrequent segmentation fault in accessing boost::unordered_multimap or struct

  - by Sarah

  I'm having trouble debugging a segmentation fault. I'd appreciate tips on how to go about narrowing in on the problem. The error appears when an iterator tries to access an element of a struct Infection, defined as: struct Infection { public: explicit Infection( double it, double rt ) : infT( it ), recT( rt ) {} double infT; // infection start time double recT; // scheduled recovery time }; These structs are kept in a special structure, InfectionMap: typedef boost::unordered_multimap< int, Infection > InfectionMap; Every member of class Host has an InfectionMap carriage. Recovery times and associated host identifiers are kept in a priority queue. When a scheduled recovery event arises in the simulation for a particular strain s in a particular host, the program searches through carriage of that host to find the Infection whose recT matches the recovery time (double recoverTime). (For reasons that aren't worth going into, it's not as expedient for me to use recT as the key to InfectionMap; the strain s is more useful, and coinfections with the same strain are possible.) assert( carriage.size() > 0 ); pair<InfectionMap::iterator,InfectionMap::iterator> ret = carriage.equal_range( s ); InfectionMap::iterator it; for ( it = ret.first; it != ret.second; it++ ) { if ( ((*it).second).recT == recoverTime ) { // produces seg fault carriage.erase( it ); } } I get a "Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address..." on the line specified above. The recoverTime is fine, and the assert(...) in the code is not tripped. As I said, this seg fault appears 'randomly' after thousands of successful recovery events. How would you go about figuring out what's going on? I'd love ideas about what could be wrong and how I can further investigate the problem. Update I added a new assert and a check just inside the for loop: assert( carriage.size() > 0 ); assert( carriage.count( s ) > 0 ); pair<InfectionMap::iterator,InfectionMap::iterator> ret = carriage.equal_range( s ); InfectionMap::iterator it; cout << "carriage.count(" << s << ")=" << carriage.count(s) << endl; for ( it = ret.first; it != ret.second; it++ ) { cout << "(*it).first=" << (*it).first << endl; // error here if ( ((*it).second).recT == recoverTime ) { carriage.erase( it ); } } The EXC_BAD_ACCESS error now appears at the (*it).first call, again after many thousands of successful recoveries. Can anyone give me tips on how to figure out how this problem arises? I'm trying to use gdb. Frame 0 from the backtrace reads "#0 0x0000000100001d50 in Host::recover (this=0x100530d80, s=0, recoverTime=635.91148029170529) at Host.cpp:317" I'm not sure what useful information I can extract here. Update 2 I added a break; after the carriage.erase(it). This works, but I have no idea why (e.g., why it would remove the seg fault at (*it).first.

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• More localized, efficient Lowest Common Ancestor algorithm given multiple binary trees?

  - by mstksg

  I have multiple binary trees stored as an array. In each slot is either nil (or null; pick your language) or a fixed tuple storing two numbers: the indices of the two "children". No node will have only one child -- it's either none or two. Think of each slot as a binary node that only stores pointers to its children, and no inherent value. Take this system of binary trees: 0 1 / \ / \ 2 3 4 5 / \ / \ 6 7 8 9 / \ 10 11 The associated array would be: 0 1 2 3 4 5 6 7 8 9 10 11 [ [2,3] , [4,5] , [6,7] , nil , nil , [8,9] , nil , [10,11] , nil , nil , nil , nil ] I've already written simple functions to find direct parents of nodes (simply by searching from the front until there is a node that contains the child) Furthermore, let us say that at relevant times, both all trees are anywhere between a few to a few thousand levels deep. I'd like to find a function P(m,n) to find the lowest common ancestor of m and n -- to put more formally, the LCA is defined as the "lowest", or deepest node in which have m and n as descendants (children, or children of children, etc.). If there is none, a nil would be a valid return. Some examples, given our given tree: P( 6,11) # => 2 P( 3,10) # => 0 P( 8, 6) # => nil P( 2,11) # => 2 The main method I've been able to find is one that uses an Euler trace, which turns the given tree, with a node A to be the invisible parent of 0 and 1 with a depth of -1, into: A-0-2-6-2-7-10-7-11-7-2-0-3-0-A-1-4-1-5-8-5-9-5-1-A And from that, simply find the node between your given m and n that has the lowest number; For example, to find P(6,11), look for a 6 and an 11 on the trace. The number between them that is the lowest is 2, and that's your answer. If A is in between them, return nil. -- Calculating P(6,11) -- A-0-2-6-2-7-10-7-11-7-2-0-3-0-A-1-4-1-5-8-5-9-5-1-A ^ ^ ^ | | | m lowest n Unfortunately, I do believe that finding the Euler trace of a tree that can be several thousands of levels deep is a bit machine-taxing...and because my tree is constantly being changed throughout the course of the programming, every time I wanted to find the LCA, I'd have to re-calculate the Euler trace and hold it in memory every time. Is there a more memory efficient way, given the framework I'm using? One that maybe iterates upwards? One way I could think of would be the "count" the generation/depth of both nodes, and climb the lowest node until it matched the depth of the highest, and increment both until they find someone similar. But that'd involve climbing up from level, say, 3025, back to 0, twice, to count the generation, and using a terribly inefficient climbing-up algorithm in the first place, and then re-climbing back up. Are there any other better ways?

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• scroll into view the selected element

  - by yb007

  hi all, i am a newbie to javascript... i have two select boxes with multiple selection enabled.When i select an element from first select box it scrolls into view the corrosponding element from the second list.The single selection goes fine in all browsers explorer,firefox,chrome. now, if i select the first,last element from the first selection box the second select box does not scrolls into view the last selected element in chrome browser.although , it works fine in internet explorer and firefox. Please help me to make it run in google chrome browser. <html> <head> <script language="javascript"> function SyncListsL(){ for (var i = 0; i <= [document.puser.user_select.length]-1; i++) { if(document.puser.user_select.options[i].selected == true) { document.puser.user_select2.options[i].selected=true; document.puser.user_select.options[i].selected=true; } else{ document.puser.user_select2.options[i].selected = false; document.puser.user_select.options[i].selected=false; } } } function SyncListsR(){ for (i = 0; i <= [document.puser.user_select2.length]-1; i++) { if(document.puser.user_select2.options[i].selected == true) { document.puser.user_select.options[i].selected=true; document.puser.user_select2.options[i].selected=true; } else{ document.puser.user_select.options[i].selected = false; document.puser.user_select2.options[i].selected=false; } } } </script> <title>scrollintoview</title> </head> <body bgcolor="e2dbc5"> <form name="puser" > <table align="center"> <tr> <td align="right" bgcolor="#eeeadd"> <font size=2> <select name="user_select2" multiple size="5" onChange="SyncListsR()" style="width:35mm"> <option value="a1" title="a1">a1</option> <option value="a2" title="a2">a2</option> <option value="ab" title="ab">ab</option> <option value="abc" title="abc">abc</option> <option value="e1" title="e1">e1</option> <option value="e2" title="e2">e2</option> <option value="new" title="new">new</option> </select> </font></td> <td align="left" bgcolor="#eeeadd"> <font size=2> <select name="user_select" multiple size="5" onChange="SyncListsL()" style="width:50mm"> <option value="first" title="first">first</option> <option value="last" title="last">last</option> <option value="ghi" title="ghi">ghi</option> <option value="User" title="User">User</option> <option value="ed" title="ed">ed</option> <option value="edit" title="edit">edit</option> <option value="second" title="second">second</option> </select> </font></td> </tr> </table> </form> </body> </html>

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• Testing shared memory ,strange thing happen

  - by barfatchen

  I have 2 program compiled in 4.1.2 running in RedHat 5.5 , It is a simple job to test shared memory , shmem1.c like following : #define STATE_FILE "/program.shared" #define NAMESIZE 1024 #define MAXNAMES 100 typedef struct { char name[MAXNAMES][NAMESIZE]; int heartbeat ; int iFlag ; } SHARED_VAR; int main (void) { int first = 0; int shm_fd; static SHARED_VAR *conf; if((shm_fd = shm_open(STATE_FILE, (O_CREAT | O_EXCL | O_RDWR), (S_IREAD | S_IWRITE))) > 0 ) { first = 1; /* We are the first instance */ } else if((shm_fd = shm_open(STATE_FILE, (O_CREAT | O_RDWR), (S_IREAD | S_IWRITE))) < 0) { printf("Could not create shm object. %s\n", strerror(errno)); return errno; } if((conf = mmap(0, sizeof(SHARED_VAR), (PROT_READ | PROT_WRITE), MAP_SHARED, shm_fd, 0)) == MAP_FAILED) { return errno; } if(first) { for(idx=0;idx< 1000000000;idx++) { conf->heartbeat = conf->heartbeat + 1 ; } } printf("conf->heartbeat=(%d)\n",conf->heartbeat) ; close(shm_fd); shm_unlink(STATE_FILE); exit(0); }//main And shmem2.c like following : #define STATE_FILE "/program.shared" #define NAMESIZE 1024 #define MAXNAMES 100 typedef struct { char name[MAXNAMES][NAMESIZE]; int heartbeat ; int iFlag ; } SHARED_VAR; int main (void) { int first = 0; int shm_fd; static SHARED_VAR *conf; if((shm_fd = shm_open(STATE_FILE, (O_RDWR), (S_IREAD | S_IWRITE))) < 0) { printf("Could not create shm object. %s\n", strerror(errno)); return errno; } ftruncate(shm_fd, sizeof(SHARED_VAR)); if((conf = mmap(0, sizeof(SHARED_VAR), (PROT_READ | PROT_WRITE), MAP_SHARED, shm_fd, 0)) == MAP_FAILED) { return errno; } int idx ; for(idx=0;idx< 1000000000;idx++) { conf->heartbeat = conf->heartbeat + 1 ; } printf("conf->heartbeat=(%d)\n",conf->heartbeat) ; close(shm_fd); exit(0); } After compiled : gcc shmem1.c -lpthread -lrt -o shmem1.exe gcc shmem2.c -lpthread -lrt -o shmem2.exe And Run both program almost at the same time with 2 terminal : [test]$ ./shmem1.exe First creation of the shm. Setting up default values conf->heartbeat=(840825951) [test]$ ./shmem2.exe conf->heartbeat=(1215083817) I feel confused !! since shmem1.c is a loop 1,000,000,000 times , how can it be possible to have a answer like 840,825,951 ? I run shmem1.exe and shmem2.exe this way,most of the results are conf-heartbeat will larger than 1,000,000,000 , but seldom and randomly , I will see result conf-heartbeat will lesser than 1,000,000,000 , either in shmem1.exe or shmem2.exe !! if run shmem1.exe only , it is always print 1,000,000,000 , my question is , what is the reason cause conf-heartbeat=(840825951) in shmem1.exe ? Update: Although not sure , but I think I figure it out what is going on , If shmem1.exe run 10 times for example , then conf-heartbeat = 10 , in this time shmem1.exe take a rest and then back , shmem1.exe read from shared memory and conf-heartbeat = 8 , so shmem1.exe will continue from 8 , why conf-heartbeat = 8 ? I think it is because shmem2.exe update the shared memory data to 8 , shmem1.exe did not write 10 back to shared memory before it took a rest ....that is just my theory... i don't know how to prove it !!

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• Exclamation Marks in a Query SQL

  - by mikeabyss

  I'm reading over this query, and I came upon a line where I don't understand heres the line [FETT List]![FETT Search] FETT List is a table And FETT Search is a column in FETT List Can someone explain what the exclamation mark means? Thanks

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• jqGrid filtering on the client-side using "filterToolbar"

  - by cosminaru

  Hi guys, I have to add filtering to a jqGrid that is completely managed on the client side (data is only loaded once from the server). I need to use filterToolbar in order to filter the grid data, but couldn't find info if there is a default search mechanism on the client side. Is a server-side search the only way to do this? Thanks, Cosmin

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• Customized UISearchBar

  - by Matt

  I've got an app with the following class: @interface SearchViewController : UIViewController <UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate> @property (nonatomic, retain) IBOutlet UISearchBar *search; How can I customize UISearchBar? I'd like to add a segmented button to allow for search options (and/or/phrase).

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• Textbox value to filter databound ListBox items using Javascript ?

  - by Ravikumar

  Hi Guys, I have a ListBox which is bound to a list of data items. Now I want the user to be able to filter the items shown in the ListBox based on the search expression typed in the TextBox. For each character typed in the TextBox, the ListBox items should change to show only the items matching the search expression. using Javascript ? regards ravi

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• Highlighting Text Color using Html.fromHtml() in Android?

  - by sunil

  Hi, I am developing an application in which there will be a search screen where user can search for specific keywords and that keyword should be highlighted. I have found Html.fromHtml method. But I will like to know whether its the proper way of doing it or not. Please let me know your views on this. Regards Sunil

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• need help with jquery selectors

  - by photographer

  I've got code like that: <ul class="gallery_demo_unstyled"> <li class="active"><img src='001.jpg' /></li> <li><img src='002.jpg' /></li> <li><img src='003.jpg' /></li> <li><img src='004.jpg' /></li> <li><img src='005.jpg' /></li> <li><img src='006.jpg' /></li> </ul> <div class="Paginator"> <a href="../2/" class="Prev">&lt;&lt;</a> <a href="../1/">1</a> <a href="../2/">2</a> <span class="this-page">3</span> <a href="../4/">4</a> <a href="../5/">5</a> <a href="../4/" class="Next">&gt;&gt;</a> </div> <div class="Albums"><div class="AlbumsMenu"> <p><b>ALBUMS</b></p> <p><a href="../../blackandwhite/1/" >blackandwhite</a></p> <p><a href="../../color/1/" class='this-page'>>>color</a></p> <p><a href="../../film/1/" >film</a></p> <p><a href="../../digital/1/" >digital</a></p> <p><a href="../../portraits/1/" >portraits</a></p> </div></div> ...and some JavaScript/jQuery allowing to cycle through the images (the very top li elements) going back to the first image after the last one: $$.nextSelector = function(selector) { return $(selector).is(':last-child') ? $(selector).siblings(':first-child') : $(selector).next(); }; Current page is always 'this-page' class (span or p in my case, but I could change that if necessary). The question: what should I change in my code to make it go after the last image to the next page instead of cycling through the page over and over again, and after the last page to the next album? And to the first image on the first page of the first album after the last-last-last (or just stop there — don't really care)?

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• Extracting pair member in lambda expressions and template typedef idiom

  - by Nazgob

  Hi, I have some complex types here so I decided to use nifty trick to have typedef on templated types. Then I have a class some_container that has a container as a member. Container is a vector of pairs composed of element and vector. I want to write std::find_if algorithm with lambda expression to find element that have certain value. To get the value I have to call first on pair and then get value from element. Below my std::find_if there is normal loop that does the trick. My lambda fails to compile. How to access value inside element which is inside pair? I use g++ 4.4+ and VS 2010 and I want to stick to boost lambda for now. #include <vector> #include <algorithm> #include <boost\lambda\lambda.hpp> #include <boost\lambda\bind.hpp> template<typename T> class element { public: T value; }; template<typename T> class element_vector_pair // idiom to have templated typedef { public: typedef std::pair<element<T>, std::vector<T> > type; }; template<typename T> class vector_containter // idiom to have templated typedef { public: typedef std::vector<typename element_vector_pair<T>::type > type; }; template<typename T> bool operator==(const typename element_vector_pair<T>::type & lhs, const typename element_vector_pair<T>::type & rhs) { return lhs.first.value == rhs.first.value; } template<typename T> class some_container { public: element<T> get_element(const T& value) const { std::find_if(container.begin(), container.end(), bind(&typename vector_containter<T>::type::value_type::first::value, boost::lambda::_1) == value); /*for(size_t i = 0; i < container.size(); ++i) { if(container.at(i).first.value == value) { return container.at(i); } }*/ return element<T>(); //whatever } protected: typename vector_containter<T>::type container; }; int main() { some_container<int> s; s.get_element(5); return 0; }

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• Data Annotations for validation, at least one required field?

  - by Boob

  If I have a search object with a list of fields, can I, using the System.ComponentModel.DataAnnotations namespace, set it up to validate that at least one of the fields in the search is not null or empty? i.e All the fields are optional but at least one should always be entered.

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• Symfony and doctrine searchable sfDoctrinePager (symfony 1.4)

  - by Joeri

  Can someone help me on paginating results with sfDoctrinePager? $articlesResults = Doctrine::getTable('Article') ->getTemplate('Doctrine_Template_I18n') ->getPlugin() ->getTable() ->getGenerator('Doctrine_Search') ->search($searchTerm); This is the code I use to get the search results, this works fine, but I'm stuck on paginating them with sfDoctrinePager. Tnx for the help.

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• WPF ListView Cannot Trigger Selection Changed when only one row

  - by Traci

  I have a listview which has its datasource changed after update of a search textbox. When I enter search criteria that only returns one row, I am unable to trigger the OnSelectionChanged event The listbox works as expected at any other time. I have tried changing SelectedItem and SelectedIndex in Code, Clicking aimlessly on the ListView both on and off the row and are at the brink of insanity. Does anyone know of a solution so that I am able to change the selected item!! Help Please

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• How to Solve N-Queens Problem in Scheme?

  - by Philip

  Hi, I'm stuck on the extended exercise 28.2 of How to Design Programs. Here is the link to the question: http://www.htdp.org/2003-09-26/Book/curriculum-Z-H-35.html#node_chap_28 I used a vector of true or false values to represent the board instead of using a list. This is what I've got which doesn't work: #lang Scheme (define-struct posn (i j)) ;takes in a position in i, j form and a board and returns a natural number that represents the position in index form ;example for board xxx ; xxx ; xxx ;(0, 1) - 1 ;(2, 1) - 7 (define (board-ref a-posn a-board) (+ (* (sqrt (vector-length a-board)) (posn-i a-posn)) (posn-j a-posn))) ;reverse of the above function ;1 - (0, 1) ;7 - (2, 1) (define (get-posn n a-board) (local ((define board-length (sqrt (vector-length a-board)))) (make-posn (floor (/ n board-length)) (remainder n board-length)))) ;determines if posn1 threatens posn2 ;true if they are on the same row/column/diagonal (define (threatened? posn1 posn2) (cond ((= (posn-i posn1) (posn-i posn2)) #t) ((= (posn-j posn1) (posn-j posn2)) #t) ((= (abs (- (posn-i posn1) (posn-i posn2))) (abs (- (posn-j posn1) (posn-j posn2)))) #t) (else #f))) ;returns a list of positions that are not threatened or occupied by queens ;basically any position with the value true (define (get-available-posn a-board) (local ((define (get-ava index) (cond ((= index (vector-length a-board)) '()) ((vector-ref a-board index) (cons index (get-ava (add1 index)))) (else (get-ava (add1 index)))))) (get-ava 0))) ;consume a position in the form of a natural number and a board ;returns a board after placing a queen on the position of the board (define (place n a-board) (local ((define (foo x) (cond ((not (board-ref (get-posn x a-board) a-board)) #f) ((threatened? (get-posn x a-board) (get-posn n a-board)) #f) (else #t)))) (build-vector (vector-length a-board) foo))) ;consume a list of positions in the form of natural number and consumes a board ;returns a list of boards after placing queens on each of the positions on the board (define (place/list alop a-board) (cond ((empty? alop) '()) (else (cons (place (first alop) a-board) (place/list (rest alop) a-board))))) ;returns a possible board after placing n queens on a-board ;returns false if impossible (define (placement n a-board) (cond ((zero? n) a-board) (else (local ((define available-posn (get-available-posn a-board))) (cond ((empty? available-posn) #f) (else (or (placement (sub1 n) (place (first available-posn) a-board)) (placement/list (sub1 n) (place/list (rest available-posn) a-board))))))))) ;returns a possible board after placing n queens on a list of boards ;returns false if all the boards are not valid (define (placement/list n boards) (cond ((empty? boards) #f) ((zero? n) (first boards)) ((not (boolean? (placement n (first boards)))) (first boards)) (else (placement/list n (rest boards)))))

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• Chrome Extension - Cross-Origin XMLHttpRequest - Returning HTML/JSON

  - by Tyler

  Hi everyone, I hope you can help me :) I've created a Chrome extension (my first one) and I'm having some difficulty auto-populating a <select> with <option> that are being returned. the default_popup page is index.htm. I have two <select> (listboxes? can't remember the name) boxes. When a user first clicks the extension, it performs a XMLHttpRequest to a php script and get's a list of names from a MySQL database. It returns (onLoad) the list in the form of: <option>blah</option> When a user selects an option from the first listbox/select, it performs another XMLHttpRequest and auto-populates the second listbox/select. Then when a user selects an option from the second listbox it will eventually populate a few details further down the page. I've been testing by just running the index.htm file and seeing if just the code works correctly, which it does. However when trying to view it from the extension, it doesn't work. The onLoad doesn't fill in the first listbox, and selecting an option (one that I typed in the box for testing purposes) from the first listbox doesn't populate the second listbox. I thought maybe it was a permissions error, so I tried adding the domain to the manifest.json file; but I appear to be getting an error in the manifest.json file after doing so. In my default_popup (index.htm) file I have this script for my XMLHttpRequest: <script type="text/javascript"> function getClient(str,type) { if (str=="") { document.getElementById(type).innerHTML=""; return; } if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById(type).innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","http://(domain removed)/Extension/getInfo.php?q="+type+"&c="+str,true,"user","pass"); xmlhttp.send(); } </script> This is what my manifest.json file looks like: { "name": "Client Center Lite", "version": "1.0", "description": "blah", "browser_action": { "default_icon": "images/icon_19.png", "default_popup": "index.htm", "default_title": "Client Center Lite" }, "icons":{ "128":"images/icon_128.png" } "permissions": { "http://(domain removed)/" }, } Am I doing this correctly? The point of the extension is to be able to quickly view client details. The extension will only be given to employees locally in a .crx file, and not distributed online. The domain I am accessing through the PHP/MySQL is accessible from the web, but I'm currently using localhost in my mysql_connect string. Do I need to be returning the <option> elements encoded as JSON? If so, I'm completely cluesless as how to do that.

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• django: CheckboxMultiSelect problem with db queries

  - by xiackok

  firstly sorry for my bad english there is a simple model Person. That contains just languages: LANGUAGE_LIS = ( (1, 'English'), (2, 'Turkish'), (3, 'Spanish') ) class Person(models.Model): languages = models.CharField(max_length=100, choices=LANGUAGE_LIST) #languages is multi value (CheckBoxSelectMultiple) and here person_save_form: class person_save_form(forms.ModelForm): languages = forms.CharField(widget=forms.CheckBoxSelectMultiple(choices=LANGUAGE_LIST)) class Meta: model = Person it is ok. but how can i search persons for languages like "get persons who knows turkish and english" in the database (MySQL) record "languages" column seen like "[u'1', u'2']". but i want search persons like this: persons = Person.objects.filter(languages__in=request.POST.getlist('languages'))

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• PHP: Rawurlencode inside Preg-replace

  - by elmaso

  Hello, I have this snippet while($row = mysql_fetch_array($result)){ $search = '' . $row['searchquery']; echo '<a href="http://www.example.com/' . preg_replace( array('/[^\s\w]/','/\s/'),array('','+'),$search) . '+/">' ... but if someone types in äöü, it doesnt show the letters - with rawurlencode thats possible, but I want to remove the blank spaces with pregreplace and replace it with + is that possible?

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• UITableView having one Cell with multiple UITextFields (some of them in one row) scrolling crazy

  - by Allisone

  I have a UITableView (grouped). In that tableview I have several UITableViewCells, some custom with nib, some default. One Cell (custom) with nib has several UITextfields for address information, thus also one row has zip-code and city in one row. When I get the keyboard the tableview size seems to be adjusted automatically (vs. another viewController in the app with just a scrollview where I had to code this functionality on my own) so that i can scroll to the bottom of my tableview (and see it) even though the keyboard is up. That's good. BUT when I click on a textfield the tableview gets either scrolled up, or down, I can't figure out the logic. It seems to be rather random up/down scrolling / contentOffset setting. So I have bound the Editing Did Begin events of the textfields to a function that has this code. - (IBAction)textFieldDidBeginEditing:(UITextField *)textField { CGPoint pt; CGRect rc = [textField bounds]; rc = [textField convertRect:rc toView:self.tableView]; pt = rc.origin; pt.x = 0; [self.tableView setContentOffset:pt animated:YES]; ... } This, well, it seems to work most of the time, BUT it doesn't work if I click the first textfield (the view jumps so that the second row gets to the top and the first row is out of the current visible view frame) AND it also doesn't work if I first select the zip textfield and next the city textfield (both in one row) or vice versa. If I do so, the tableview seems to jump to the (grouped tableview) top of my viewForHeaderInSection(this section with this mentioned cell with all my textfields) What is is going on ? Why is this happening ? How to fix this ? Edit This on the other hand behaves as expected (for the two Textviews wit same origin.y) if (self.tableView.contentOffset.y == pt.y) { pt.y = pt.y + 1; [self.tableView setContentOffset:pt animated:YES]; }else { [self.tableView setContentOffset:pt animated:YES]; } But this is a stupid solution. I wouldn't like to keep it that way. And this also doesn't fix the wrong jumping, when clicking the first textfield at first.

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• Skip List vs. Binary Tree

  - by Claudiu

  I recently came across the data structure known as a Skip list. They seem to have very similar behavior to a binary search tree... my question is - why would you ever want to use a skip list over a binary search tree?

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