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• Estimate angle to launch missile, maths question

  - by Jonathan

  I've been working on this for an hour or two now and my maths really isn't my strong suit which is definitely not a good thing for a game programmer but that shouldn't stop me enjoying a hobby surely? After a few failed attempts I was hoping someone else out there could help so here's the situation. I'm trying to implement a bit of faked intelligence when the A.I fires it's missiles at a target in a 2D game world. By predicting the likely position the target will be in given it's current velocity and the time it will take the missile to reach it's target. I created an image to demonstrate my thinking: http://i.imgur.com/SFmU3.png which also contains the logic I use for accelerating the missile after launch. The ship that fires the missile can fire within a total of 40 degree angle, 20 either side of itself, but this could likely become variable. My current attempt was to break the space between the two lines into segments which match the targets width. Then calculate the time it would take the missile to get to that location using the formula. So for each iteration of this we total up the values and that tells us the distance travelled, ad it would then just need compared to distance to the segment. startVelocity * ((startVelocity * acceleration)^(currentframe-1) So for example. If we start at a velocity of 1f/frame with an acceleration of 0.1f the formula, at frame 4, would be 1 * (1.1^3) = 1.331 But I quickly realized I was getting lost when trying to put this into practice. Does this seem like a correct starting point or am I going completely the wrong way about it? Any pointers would help me greatly. Maths really isn't my strong suit so I get easily lost in these matters and don't even really know a good phrase to search for with this. So I guess in summary my question is more about the correct way to approach this problem and any additional code samples on top of that would be great but I'm not averse to working out the complete code from helpful pointers.

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• Moving 2d camera in the y direction

  - by Alex

  I'm developing a simple game for the iphone and am struggling to work out the best way for the camera to follow the main character. The following picture hightlights the three main components: There are 3 components to this: Circle - the main character Green line - terrain Black background The terrain is simply made from an array of points (approx 20 points per screen width). The terrain is moved in the x direction relative to the black background in order to keep the circle in its position shown. The distance to move the terrain is simply: movex = circle.position.x - terrain.position.x with a constant to fix the circle at some distance from the left of the screen. I am struggling to determine the best way to position the terrain in the y plane keep the focus in the character. I want to move the terrain in the y direction smoothly and not fix it to the position of the circle, so the circle can move in the y plane. If I take the same approach as the x positioning, the character is fixed at a point on the screen and the terrain moves. I could sample some terrain points either side of the character and produce an average, but in my implementation this was not smooth. I thought another approach might be to create a camera 'line' that is a smooth version of the terrain line and make the camerea follow this, but I'm not sure if this is the optimum solution. Any advice is much appreciated!

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• Combining pathfinding with global AI objectives

  - by V_Programmer

  I'm making a turn-based strategy game using Java and LibGDX. Now I want to code the AI. I haven't written the AI code yet. I've simply designed it. The AI will have two components, one focused in tactics and resource management (create troops, determine who have strategical advantage, detect important objectives, etc) and a individual component, focused in assign the work to each unit, examine its possibilites and move the unit. Now I'm facing an important problem. The map where the action take place is a grid-based map. Each terrain has different movement cost. I read about pathfinding and I think A* is a very good option to determine a good route between two points. However, imagine I have an unit with movement = 5 (i.e, it can move 5 tiles of movement cost = 1). My tactical AI has found an objective at a distance d = 20 tiles (Manhattan distance) from my unit. My problem is the following: the unit won't be able to reach the objective in one turn. So the AI will have to store a list of position and execute them in various turns. I don't know how to solve this. PS. In my unit code, I have a list called "selectionMarks" which stores all the possible places where the unit can go in this turn. This places are calculed recursively using a "getSelectionMarks" function. Any help is appreciated :D

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• Java Slick2d - Mouse picking how to take into account camera

  - by Corey

  When I move it it obviously changes the viewport so my mouse picking is off. My camera is just a float x and y and I use g.translate(-cam.cameraX+400, -cam.cameraY+300); to translate the graphics. I have the numbers hard coded just for testing purposes. How would I take into account the camera so my mouse picking works correctly. double mousetileX = Math.floor((double)mouseX/tiles.tileWidth); double mousetileY = Math.floor((double)mouseY/tiles.tileHeight); double playertileX = Math.floor(playerX/tiles.tileWidth); double playertileY = Math.floor(playerY/tiles.tileHeight); double lengthX = Math.abs((float)playertileX - mousetileX); double lengthY = Math.abs((float)playertileY - mousetileY); double distance = Math.sqrt((lengthX*lengthX)+(lengthY*lengthY)); if(input.isMousePressed(Input.MOUSE_LEFT_BUTTON) && distance < 4) { if(tiles.map[(int)mousetileX][(int)mousetileY] == 1) { tiles.map[(int)mousetileX][(int)mousetileY] = 0; } } That is my mouse picking code

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• Normalizing the direction to check if able to move

  - by spartan2417

  i have a a room with 4 walls along the x and z axis respectively. My player who is in first person (therefore the camera) should have collision detection with these walls. I'm relatively new to this so please bare with me. I believe the way to do this is to calculate the direction and distance to the wall from the camera and then normalize the directions. However i can only get this far before i dont know what to do. I think you should work out the angle and direction your facing? where _dx and _dz is the small buffer in front of the camera. float CalcDirection(float Cam_x, float Cam_z, float Wall_x, float Wall_z) { //Calculate direction and distance to obstacle. float ob_dirx = Cam_x + _dx - Wall_x; float ob_dirz = Cam_z + _dz - Wall_z; float ob_dist = sqrt(ob_dirx*ob_dirx + ob_dirz*ob_dirz); //Normalise directions float ob_norm = sqrt(ob_dirx*ob_dirx + ob_dirz*ob_dirz); ob_dirx = (ob_dirx)/ob_norm; ob_dirz = (ob_dirz)/ob_norm; can anyone explain in laymen's terms how i work out the angle?

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• A simple example of movement prediction

  - by Daniel

  I've seen lots of examples of theory about the reason for client-side prediction, but I'm having a hard time converting it into code. I was wondering if someone knows of some specific examples that share some of the code, or can share their knowledge to shed some light into my situation. I'm trying to run some tests to get a the movement going (smoothly) between multiple clients. I'm using mouse input to initiate movement. I'm using AS3 and C# on a local Player.IO server. Right now I'm trying to get the Client side working, as I'm only forwarding position info with the client. I have 2 timers, one is an onEnterFrame and the other is a 100ms Timer, and one on mouseClick listener. When I click anywhere with a mouse, I update my player class to give it a destination point On every enterFrame Event for the player, it moves towards the destination point At every 100ms it sends a message to the server with the position of where it should be in a 100ms. The distance traveled is calculated by taking the distance (in Pixels) that the player can travel in one second, and dividing it by the framerate for the onEnterFrame handler, and by the update frequency (1/0.100s) for the server update. For the other Players, the location is interpolated and animated on every frame based on the new location. Is this the right way of doing it?

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• Neural network input preprocessing

  - by TND

  It's clear that the effectiveness of a neural network depends strongly on the format you give it to work with. You want to preprocess it into the most convenient form you can algorithmically get to, so that the neural network doesn't have to account for that itself. I'm working on a little project that (surprise!) is going to be using neural networks. My future goal is to eventually use NEAT, which I'm really excited about. Anyway, one of my ideas involves moving entities in continuous 2D space, from a top-down perspective (this would be a really cool game AI). Of course, unless these guys are blind, they're going to be able to see the world around them. There's a lot of different ways this information could be fed into the network. One interesting but expensive way is to simply render a top-down "view" of things, with the entities as dots on the picture, and feed that in. I was hoping for something much simpler to use (at least at first), such as a list of the x (maybe 7 or so) nearest entities and their position in relative polar coordinates, orientation, health, etc., but I'm trying to think of the best way to do it. My first instinct was to order them by distance, which would inherently also train the neural network to consider those more "important". However, I was thinking- what if there's two entities that are nearly the same distance away? They could easily alternate indexes in that list, confusing the network. My question is, is there a better way of representing this? Essentially, the issue is the network needs a good way of keeping track of who's who, while knowing (by being inputted) relevant information about the list of entities it can see. Thanks!

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• Make Gameobject Stand On Surface Facing Certain Direction

  - by Julian

  I want to make a biped character stand on any surface I click on. Surfaces have up vectors of any of positive or negative X,Y,Z. So imagine a cube with each face being a gameobject whose up vector pointing directly away from the cube. If my character is facing "forward" and I click on a surface which is to the left or right of me ( left or right walls), I want my character to now be standing on that surface but still be facing in the direction he initially was. If I click on a wall which is in the forward path of my character i want him to now be standing on that surface and his forward to now be what was once "up" relative to my character. Here is the code I am working with now. void Update() { if (Input.GetMouseButtonUp (0)) { RaycastHit hit; var ray = Camera.main.ScreenPointToRay(Input.mousePosition); if (Physics.Raycast(ray, out hit)) { Vector3 upVectBefore = transform.up; Vector3 forwardVectBefore = transform.forward; Quaternion rotationVectBefore = transform.rotation; Vector3 hitPosition = hit.transform.position; transform.position = hitPosition; float lookDifference = Vector3.Distance(hit.transform.up, forwardVectBefore); if(Vector3.Distance(hit.transform.up, upVectBefore) < .23) //Same normal { transform.rotation = rotationVectBefore; } else if(lookDifference > 1.412 && lookDifference <= 1.70607) //side wall { transform.up = hit.transform.up; transform.forward = forwardVectBefore; } else //head on wall { transform.up = hit.transform.up; transform.forward = upVectBefore; } } } } The first case "Same normal" works fine, however the other two do not work as I would like them to. Sometimes my character is laying down on the surface or on the wrong side of the surface. Does anyone know nice way of solving this problem?

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• Drawing a texture line between two vectors in XNA WP7

  - by Krav

  I want to create a simple graph maker in WP7. The goal is to draw a texture line between two vectors what the user defines with touch. I already made the rotation, and it is working, but not correctly, because it doesn't calculate the line's texture height, and because of that, there are too many overlapping textures. So it does draw the line, but too many of them. How could I calculate it correctly? Here is the code: public void DrawLine(Vector2 st,Vector2 dest,NodeUnit EdgeParent,NodeUnit EdgeChild) { float d = Vector2.Distance(st, dest); float rotate = (float)(Math.Atan2(st.Y - dest.Y, st.X - dest.X)); direction = new Vector2(((dest.X - st.X) / (float)d), (dest.Y - st.Y) / (float)d); Vector2 _pos = st; World.TheHive.Add(new LineHiveMind(linetexture, _pos, rotate, EdgeParent, EdgeChild,new List<LineUnit>())); for (int i = 0; i < d; i++) { World.TheHive.Last()._lines.Add(new LineUnit(linetexture, _pos, rotate, EdgeParent, EdgeChild)); _pos += direction; } } d is for the Distance of the st (Starting node) and dest (Destination node) rotate is for rotation direction calculates the direction between the starting and the destination node _pos is for starting position changing Thanks for any suggestions/help!

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• Would having an undergraduate certificate in Computer Science help me get employed as a computer programmer? [on hold]

  - by JDneverSleeps

  I am wondering how would employers perceive the Universtiy Certificate in Computing and Information Systems offered by Athabasca University (a distance education institution... The university is legit and accredited by the Government of Alberta, Canada). I already have a BSc in Statistics from University of Alberta (a classic brick and mortar public university in Alberta, Canada)...so I can state in my resume that I have a "university degree"..... Luckily, I was able to secure a very good employment in my field after the graduation from the U of A. The main reason why I am interested in taking the certificate program through Athabasca is because knowing how to program can increase the chance for promotion in my current job. I also believe that if something turns out bad in my current job and if I ever need to look for a new place to work, having the certificate in computer science will help me get employed as a computer programmer (i.e. my choice for the new job wouldn't be restricted to the field of Statistics). Athabasca University is claiming that the certificate program is meant to be equivalent to the undergraduate minor in computing science. I carefully looked at the certificate's curriculum and as far as I am concerned, the certificate program does have the same level of rigour as the undergraduate minor in Computer Science programs offered by other Canadian universities. I am also confident that the certificate program will get me to pick up enough skills/background to start a career as a computer programmer. The reasons why I am not 100% sure on getting the certificate is worth the tuition are: Athabasca University is a distance education institution (accredited by government but still) The credential that I will receive is "university certificate", not a "undergraduate degree" Do you think it's a good idea for me to pursue the certificate, given the two facts above? again, I already have my Bachelor's degree - although it is not in CS Thanks,

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• Steering evaluate fitness

  - by Vodemki

  I've made a simple game with a steering model that manage a crowd of agents. I use an genetic algorithm to find the best parameters to use in my system but I need to determine a fitness for each simulation. I know it's something like that: number of collisions * time to reach goal * effort But I don't know how to calculate the effort, is there a special way to do that ? Here is what I've done so far: // Evaluate the distance from agents to goal Real totalDistance(0.0); for (unsigned i=0; i<_agents.size(); i++) { totalDistance += _agents[i]->position().distance(_agents[i]->_goal->position()); } Real totalWallsCollision(0.0); for (unsigned i=0; i<_agents.size(); i++) { for (unsigned j=0; j<walls.size(); j++) { if ( walls[j]->inside(_agents[i]->position()) ) { totalCollision += 1.0; } } } return totalDistance + totalWallsCollision; Thanks for your help.

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• Strange Recurrent Excessive I/O Wait

  - by Chris

  I know quite well that I/O wait has been discussed multiple times on this site, but all the other topics seem to cover constant I/O latency, while the I/O problem we need to solve on our server occurs at irregular (short) intervals, but is ever-present with massive spikes of up to 20k ms a-wait and service times of 2 seconds. The disk affected is /dev/sdb (Seagate Barracuda, for details see below). A typical iostat -x output would at times look like this, which is an extreme sample but by no means rare: iostat (Oct 6, 2013) tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 16.00 0.00 156.00 9.75 21.89 288.12 36.00 57.60 5.50 0.00 44.00 8.00 48.79 2194.18 181.82 100.00 2.00 0.00 16.00 8.00 46.49 3397.00 500.00 100.00 4.50 0.00 40.00 8.89 43.73 5581.78 222.22 100.00 14.50 0.00 148.00 10.21 13.76 5909.24 68.97 100.00 1.50 0.00 12.00 8.00 8.57 7150.67 666.67 100.00 0.50 0.00 4.00 8.00 6.31 10168.00 2000.00 100.00 2.00 0.00 16.00 8.00 5.27 11001.00 500.00 100.00 0.50 0.00 4.00 8.00 2.96 17080.00 2000.00 100.00 34.00 0.00 1324.00 9.88 1.32 137.84 4.45 59.60 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 22.00 44.00 204.00 11.27 0.01 0.27 0.27 0.60 Let me provide you with some more information regarding the hardware. It's a Dell 1950 III box with Debian as OS where uname -a reports the following: Linux xx 2.6.32-5-amd64 #1 SMP Fri Feb 15 15:39:52 UTC 2013 x86_64 GNU/Linux The machine is a dedicated server that hosts an online game without any databases or I/O heavy applications running. The core application consumes about 0.8 of the 8 GBytes RAM, and the average CPU load is relatively low. The game itself, however, reacts rather sensitive towards I/O latency and thus our players experience massive ingame lag, which we would like to address as soon as possible. iostat: avg-cpu: %user %nice %system %iowait %steal %idle 1.77 0.01 1.05 1.59 0.00 95.58 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sdb 13.16 25.42 135.12 504701011 2682640656 sda 1.52 0.74 20.63 14644533 409684488 Uptime is: 19:26:26 up 229 days, 17:26, 4 users, load average: 0.36, 0.37, 0.32 Harddisk controller: 01:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 1078 (rev 04) Harddisks: Array 1, RAID-1, 2x Seagate Cheetah 15K.5 73 GB SAS Array 2, RAID-1, 2x Seagate ST3500620SS Barracuda ES.2 500GB 16MB 7200RPM SAS Partition information from df: Filesystem 1K-blocks Used Available Use% Mounted on /dev/sdb1 480191156 30715200 425083668 7% /home /dev/sda2 7692908 437436 6864692 6% / /dev/sda5 15377820 1398916 13197748 10% /usr /dev/sda6 39159724 19158340 18012140 52% /var Some more data samples generated with iostat -dx sdb 1 (Oct 11, 2013) Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sdb 0.00 15.00 0.00 70.00 0.00 656.00 9.37 4.50 1.83 4.80 33.60 sdb 0.00 0.00 0.00 2.00 0.00 16.00 8.00 12.00 836.00 500.00 100.00 sdb 0.00 0.00 0.00 3.00 0.00 32.00 10.67 9.96 1990.67 333.33 100.00 sdb 0.00 0.00 0.00 4.00 0.00 40.00 10.00 6.96 3075.00 250.00 100.00 sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.00 0.00 0.00 100.00 sdb 0.00 0.00 0.00 2.00 0.00 16.00 8.00 2.62 4648.00 500.00 100.00 sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.00 0.00 0.00 100.00 sdb 0.00 0.00 0.00 1.00 0.00 16.00 16.00 1.69 7024.00 1000.00 100.00 sdb 0.00 74.00 0.00 124.00 0.00 1584.00 12.77 1.09 67.94 6.94 86.00 Characteristic charts generated with rrdtool can be found here: iostat plot 1, 24 min interval: http://imageshack.us/photo/my-images/600/yqm3.png/ iostat plot 2, 120 min interval: http://imageshack.us/photo/my-images/407/griw.png/ As we have a rather large cache of 5.5 GBytes, we thought it might be a good idea to test if the I/O wait spikes would perhaps be caused by cache miss events. Therefore, we did a sync and then this to flush the cache and buffers: echo 3 > /proc/sys/vm/drop_caches and directly afterwards the I/O wait and service times virtually went through the roof, and everything on the machine felt like slow motion. During the next few hours the latency recovered and everything was as before - small to medium lags in short, unpredictable intervals. Now my question is: does anybody have any idea what might cause this annoying behaviour? Is it the first indication of the disk array or the raid controller dying, or something that can be easily mended by rebooting? (At the moment we're very reluctant to do this, however, because we're afraid that the disks might not come back up again.) Any help is greatly appreciated. Thanks in advance, Chris. Edited to add: we do see one or two processes go to 'D' state in top, one of which seems to be kjournald rather frequently. If I'm not mistaken, however, this does not indicate the processes causing the latency, but rather those affected by it - correct me if I'm wrong. Does the information about uninterruptibly sleeping processes help us in any way to address the problem? @Andy Shinn requested smartctl data, here it is: smartctl -a -d megaraid,2 /dev/sdb yields: smartctl 5.40 2010-07-12 r3124 [x86_64-unknown-linux-gnu] (local build) Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net Device: SEAGATE ST3500620SS Version: MS05 Serial number: Device type: disk Transport protocol: SAS Local Time is: Mon Oct 14 20:37:13 2013 CEST Device supports SMART and is Enabled Temperature Warning Disabled or Not Supported SMART Health Status: OK Current Drive Temperature: 20 C Drive Trip Temperature: 68 C Elements in grown defect list: 0 Vendor (Seagate) cache information Blocks sent to initiator = 1236631092 Blocks received from initiator = 1097862364 Blocks read from cache and sent to initiator = 1383620256 Number of read and write commands whose size <= segment size = 531295338 Number of read and write commands whose size > segment size = 51986460 Vendor (Seagate/Hitachi) factory information number of hours powered up = 36556.93 number of minutes until next internal SMART test = 32 Error counter log: Errors Corrected by Total Correction Gigabytes Total ECC rereads/ errors algorithm processed uncorrected fast | delayed rewrites corrected invocations [10^9 bytes] errors read: 509271032 47 0 509271079 509271079 20981.423 0 write: 0 0 0 0 0 5022.039 0 verify: 1870931090 196 0 1870931286 1870931286 100558.708 0 Non-medium error count: 0 SMART Self-test log Num Test Status segment LifeTime LBA_first_err [SK ASC ASQ] Description number (hours) # 1 Background short Completed 16 36538 - [- - -] # 2 Background short Completed 16 36514 - [- - -] # 3 Background short Completed 16 36490 - [- - -] # 4 Background short Completed 16 36466 - [- - -] # 5 Background short Completed 16 36442 - [- - -] # 6 Background long Completed 16 36420 - [- - -] # 7 Background short Completed 16 36394 - [- - -] # 8 Background short Completed 16 36370 - [- - -] # 9 Background long Completed 16 36364 - [- - -] #10 Background short Completed 16 36361 - [- - -] #11 Background long Completed 16 2 - [- - -] #12 Background short Completed 16 0 - [- - -] Long (extended) Self Test duration: 6798 seconds [113.3 minutes] smartctl -a -d megaraid,3 /dev/sdb yields: smartctl 5.40 2010-07-12 r3124 [x86_64-unknown-linux-gnu] (local build) Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net Device: SEAGATE ST3500620SS Version: MS05 Serial number: Device type: disk Transport protocol: SAS Local Time is: Mon Oct 14 20:37:26 2013 CEST Device supports SMART and is Enabled Temperature Warning Disabled or Not Supported SMART Health Status: OK Current Drive Temperature: 19 C Drive Trip Temperature: 68 C Elements in grown defect list: 0 Vendor (Seagate) cache information Blocks sent to initiator = 288745640 Blocks received from initiator = 1097848399 Blocks read from cache and sent to initiator = 1304149705 Number of read and write commands whose size <= segment size = 527414694 Number of read and write commands whose size > segment size = 51986460 Vendor (Seagate/Hitachi) factory information number of hours powered up = 36596.83 number of minutes until next internal SMART test = 28 Error counter log: Errors Corrected by Total Correction Gigabytes Total ECC rereads/ errors algorithm processed uncorrected fast | delayed rewrites corrected invocations [10^9 bytes] errors read: 610862490 44 0 610862534 610862534 20470.133 0 write: 0 0 0 0 0 5022.480 0 verify: 2861227413 203 0 2861227616 2861227616 100872.443 0 Non-medium error count: 1 SMART Self-test log Num Test Status segment LifeTime LBA_first_err [SK ASC ASQ] Description number (hours) # 1 Background short Completed 16 36580 - [- - -] # 2 Background short Completed 16 36556 - [- - -] # 3 Background short Completed 16 36532 - [- - -] # 4 Background short Completed 16 36508 - [- - -] # 5 Background short Completed 16 36484 - [- - -] # 6 Background long Completed 16 36462 - [- - -] # 7 Background short Completed 16 36436 - [- - -] # 8 Background short Completed 16 36412 - [- - -] # 9 Background long Completed 16 36404 - [- - -] #10 Background short Completed 16 36401 - [- - -] #11 Background long Completed 16 2 - [- - -] #12 Background short Completed 16 0 - [- - -] Long (extended) Self Test duration: 6798 seconds [113.3 minutes]

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• "Enumeration yielded no results" When using Query Syntax in C#

  - by Shantanu Gupta

  I have created this query to fetch some result from database. Here is my table structure. What exaclty is happening. DtMapGuestDepartment as Table 1 DtDepartment as Table 2 Are being used var dept_list= from map in DtMapGuestDepartment.AsEnumerable() where map.Field<Nullable<long>>("GUEST_ID") == DRowGuestPI.Field<Nullable<long>>("PK_GUEST_ID") join dept in DtDepartment.AsEnumerable() on map.Field<Nullable<long>>("DEPARTMENT_ID") equals dept.Field<Nullable<long>>("DEPARTMENT_ID") select dept.Field<string>("DEPARTMENT_ID"); I am performing this query on DataTables and expect it to return me a datatable. Here I want to select distinct department from Table 1 as well which will be my next quest. Please answer to that also if possible.

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• SetWindowLong in CustomDraw causes unhandled exception

  - by neeul

  Hello, I am making some changes to a CSliderCtrl using the Custom Draw, the control is to be used in a dialog. Here is the structure: In my MessageMap I have : ON_NOTIFY_REFLECT_EX(NM_CUSTOMDRAW, OnNMCustomdraw) The OnNMCustomdraw method looks like the following: BOOL CCustomSliderCtrl::OnNMCustomdraw(NMHDR *pNMHDR, LRESULT *pResult) { *pResult = CDRF_DODEFAULT; LPNMCUSTOMDRAW pNMCD = reinterpret_cast<LPNMCUSTOMDRAW>(pNMHDR); switch(pNMCD->dwDrawStage) { case CDDS_PREPAINT: { //Dialogs don't receive CDRF_NOTIFYITEMDRAW notifcations by returning it as part of pResult, we must //use the following so we ensure we receive the msg SetWindowLong(pNMHDR->hwndFrom, DWL_MSGRESULT, CDRF_NOTIFYITEMDRAW); return TRUE; } case CDDS_ITEMPREPAINT: if(pNMCD->dwItemSpec == TBCD_CHANNEL) { ...SNIP... SetWindowLong(pNMHDR->hwndFrom, DWL_MSGRESULT, CDRF_SKIPDEFAULT); return TRUE; } } return FALSE; } Reading around I learnt that you had to use SetWindowLong to set the return value for the custom draw, otherwise your method will not always receive the CDDS_ITEMPREPAINT message. However, when using SetWindowLong my application will never receive the CDDS_ITEMPREPAINT and so my slider just looks like a standard slider. The application crashes when any sort of interaction takes place upon the slider, such as hovering over it or minimizing and maximizing the dialog. I snipped the TBCD_CHANNEL code as it is never reached. When running in debug mode, it crashes at the end of the AfxUnlockGlobals method, in afxcrit.cpp. Here is a stack trace: Update: Since adding debug symbols, the crash seems to be picked up at CWnd::DefWindowProc mwthod. comctl32.dll!_TrackBarWndProc@16() + 0x551 bytes user32.dll!_InternalCallWinProc@20() + 0x28 bytes user32.dll!_UserCallWinProcCheckWow@32() + 0xb7 bytes user32.dll!_CallWindowProcAorW@24() + 0x51 bytes user32.dll!_CallWindowProcW@20() + 0x1b bytes mfc90ud.dll!CWnd::DefWindowProcW(unsigned int nMsg=15, unsigned int wParam=0, long lParam=0) Line 1043 + 0x20 bytes C++ mfc90ud.dll!CWnd::WindowProc(unsigned int message=15, unsigned int wParam=0, long lParam=0) Line 1756 + 0x1c bytes C++ mfc90ud.dll!AfxCallWndProc(CWnd * pWnd=0x0012fdbc, HWND__ * hWnd=0x000308fe, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0) Line 240 + 0x1c bytes C++ mfc90ud.dll!AfxWndProc(HWND__ * hWnd=0x000308fe, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0) Line 403 C++ mfc90ud.dll!AfxWndProcBase(HWND__ * hWnd=0x000308fe, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0) Line 441 + 0x15 bytes C++ user32.dll!_InternalCallWinProc@20() + 0x28 bytes user32.dll!_UserCallWinProcCheckWow@32() + 0xb7 bytes user32.dll!_DispatchClientMessage@20() + 0x4d bytes user32.dll!___fnDWORD@4() + 0x24 bytes ntdll.dll!_KiUserCallbackDispatcher@12() + 0x13 bytes user32.dll!_NtUserDispatchMessage@4() + 0xc bytes user32.dll!_DispatchMessageW@4() + 0xf bytes mfc90ud.dll!AfxInternalPumpMessage() Line 183 C++ mfc90ud.dll!CWinThread::PumpMessage() Line 900 C++ mfc90ud.dll!AfxPumpMessage() Line 190 + 0xd bytes C++ mfc90ud.dll!CWnd::RunModalLoop(unsigned long dwFlags=4) Line 4386 + 0x5 bytes C++ mfc90ud.dll!CDialog::DoModal() Line 584 + 0xc bytes C++ SetSelection.exe!CSetSelectionApp::InitInstance() Line 64 + 0xb bytes C++ mfc90ud.dll!AfxWinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, wchar_t * lpCmdLine=0x00020a84, int nCmdShow=1) Line 37 + 0xd bytes C++ SetSelection.exe!wWinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, wchar_t * lpCmdLine=0x00020a84, int nCmdShow=1) Line 34 C++ SetSelection.exe!__tmainCRTStartup() Line 578 + 0x35 bytes C SetSelection.exe!wWinMainCRTStartup() Line 403 C kernel32.dll!_BaseProcessStart@4() + 0x23 bytes So, does anyone have any insight into this matter? If you need more info just let me know.

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• Android - Autocomplete with contacts

  - by The Salt

  I've created an AutoCompleteTextView box that displays the names of all contacts, but after looking in the Android APIs, it seems my method is probably quite inefficient. Currently I am grabbing a cursor of the all the contacts, placing each name and each contact id into two different arrays, then passing the name array to the AutoCompleteTextView. When a user selects an item, I lookup which ID the contact selected in the second id array created above. Code below: private ContactNames mContactData; // Fill the autocomplete textbox Cursor contactsCursor = grabContacts(); mContactData = new ContactNames(contactsCursor); ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.contact_name, mContactData.namesArray); mNameText.setAdapter(adapter); private class ContactNames { private String[] namesArray; private long[] idsArray; private ContactNames(Cursor cur) { namesArray = new String[cur.getCount()]; idsArray = new long[cur.getCount()]; String name; Long contactid; // Get column id's int nameColumn = cur.getColumnIndex(People.NAME); int idColumn = cur.getColumnIndex(People._ID); int i=0; cur.moveToFirst(); // Check that there are actually any contacts returned by the cursor if (cur.getCount()>0){ do { // Get the field values name = cur.getString(nameColumn); contactid = Long.parseLong(cur.getString(idColumn)); // Do something with the values. namesArray[i] = name; idsArray[i] = contactid; i++; } while (cur.moveToNext()); } } private long search(String name){ // Lookup name in the contact list that we've put in an array int indexOfName = Arrays.binarySearch(namesArray, name); long contact = 0; if (indexOfName>=0) { contact = idsArray[indexOfName]; } return contact; } } private Cursor grabContacts(){ // Form an array specifying which columns to return. String[] projection = new String[] {People._ID, People.NAME}; // Get the base URI for the People table in the Contacts content provider. Uri contacts = People.CONTENT_URI; // Make the query. Cursor managedCursor = managedQuery(contacts, projection, null, null, People.NAME + " ASC"); // Put the results in ascending order by name startManagingCursor(managedCursor); return managedCursor; } There must be a better way of doing this - basically I'm struggling to see how I can find which item a user selected in an AutoCompleteTextView. Any ideas? Cheers.

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• Xuggler errors as soon as you import git

  - by user3241507

  I downloaded the Git straight into Eclipse for Xuggler (Here is the git). But as soon as it loads, there are so many errors I don't know what to do. Most of the errors are "cannot be resolved" type errors. Description Resource Path Location Type The import org.junit cannot be resolved AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 22 Java Problem The import junit cannot be resolved AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 28 Java Problem TestCase cannot be resolved to a type AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 30 Java Problem The import org.slf4j cannot be resolved AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 23 Java Problem The import org.slf4j cannot be resolved AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 24 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 94 Java Problem Test cannot be resolved to a type AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 97 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 102 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 103 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 86 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 89 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 90 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 93 Java Problem Test cannot be resolved to a type AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com /xuggle/ferry line 114 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 120 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 125 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 126 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 106 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 107 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 110 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 111 Java Problem The method assertTrue(String, boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 53 Java Problem The method assertTrue(String, boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 49 Java Problem Ignore cannot be resolved to a type AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 57 Java Problem Test cannot be resolved to a type AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 56 Java Problem Before cannot be resolved to a type AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 37 Java Problem LoggerFactory cannot be resolved AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 32 Java Problem Test cannot be resolved to a type AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 44 Java Problem The method getName() is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 40 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 81 Java Problem Test cannot be resolved to a type AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 75 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 85 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 82 Java Problem Test cannot be resolved to a type AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 64 Java Problem The method assertTrue(String, boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 61 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 72 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 69 Java Problem NameAwareTestClassRunner cannot be resolved BufferTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 44 Java Problem The method assertTrue(String, boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 167 Java Problem The method debug(String, int, String) in the type Logger is not applicable for the arguments (String, int) AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 166 Java Problem The method fail(String) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 163 Java Problem After cannot be resolved to a type BufferTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 47 Java Problem NameAwareTestClassRunner cannot be resolved to a type BufferTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 35 Java Problem The method debug(String, int, String) in the type Logger is not applicable for the arguments (String) AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 162 Java Problem Test cannot be resolved to a type AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 135 Java Problem Before cannot be resolved to a type BufferTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 41 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 131 Java Problem LoggerFactory cannot be resolved BufferTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 38 Java Problem The method assertTrue(boolean) is undefined for the type AtomicIntegerTest AtomicIntegerTest.java /xuggle-xuggler-main/test/src/com/xuggle/ferry line 130 Java Problem The import org.junit cannot be resolved AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 22 Java Problem The import org.slf4j cannot be resolved AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 23 Java Problem The import org.slf4j cannot be resolved AudioSamplesTest.java /xuggle-xuggler-main/test /src/com/xuggle/xuggler line 24 Java Problem The import junit cannot be resolved AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 31 Java Problem TestCase cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 33 Java Problem Logger cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 35 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 82 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 80 Java Problem Logger cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 89 Java Problem Logger cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 84 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 94 Java Problem Logger cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 93 Java Problem Test cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 99 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 96 Java Problem Before cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 37 Java Problem LoggerFactory cannot be resolved AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 35 Java Problem The method getName() is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 40 Java Problem Logger cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 40 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 60 Java Problem Test cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 43 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 67 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 62 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 157 Java Problem Test cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 161 Java Problem Logger cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 154 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 155 Java Problem The method assertEquals(int, long) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 172 Java Problem The method assertEquals(long, long) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 173 Java Problem The method assertNotNull(IAudioSamples) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 168 Java Problem The method assertTrue(boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 171 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 124 Java Problem The method assertNotNull(IAudioSamples) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 129 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 117 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 119 Java Problem Logger cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 145 Java Problem Logger cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 150 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 141 Java Problem The method assertTrue(String, boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 143 Java Problem The method assertTrue(boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 216 Java Problem The method assertEquals(IBuffer.Type, IBuffer.Type) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 212 Java Problem The method assertTrue(boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 208 Java Problem The method assertNotNull(IAudioSamples) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 204 Java Problem The method assertEquals(IBuffer.Type, IBuffer.Type) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 218 Java Problem The method assertEquals(int, long) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 187 Java Problem The method assertTrue(boolean) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 186 Java Problem The method assertNotNull(IAudioSamples) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 183 Java Problem Test cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 176 Java Problem Test cannot be resolved to a type AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 197 Java Problem The method assertEquals(long, long) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 192 Java Problem The method assertEquals(long, long) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 191 Java Problem The method assertEquals(long, long) is undefined for the type AudioSamplesTest AudioSamplesTest.java /xuggle-xuggler-main/test/src/com/xuggle/xuggler line 188 Java Problem For a school project, I would like to build a simple live video stream program (final year in high school) like skype, except not as complicated. Can anyone help me solve these errors? or Is there another platform I can use that would be better/easier?

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• Webview crash with Garbage Collector ON

  - by user273666

  Hi, I have a very specific web page that causes webview to crash with the Garnage Collector ON (does not crash when OFF). Easy to reproduce: create a document base application, drop a webview, and have the following line (button perhaps). - (void)connectSearch:(id)sender { [[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://apple.com"]]]; } I guess this scenario is only valid while Apple advertises their new iPad. At the bottom of the page there is two video you can watch. Click on the one on the right. When it is playing, click on the Close button (link) top left - which sends #SwapViewPreviousSelection - and that's it, it crashes. I'm just learning about the garbage collector but I suspect something is collected that should not. Any idea what can prevent the crash, other than turning off the garbage collector? Thank you. Here is what I get: Identifier: com.yourcompany.wb Version: 1.0 (1) Code Type: X86-64 (Native) Parent Process: launchd [163] Date/Time: 2010-02-15 12:26:31.069 -0500 OS Version: Mac OS X 10.6.2 (10C540) Report Version: 6 Interval Since Last Report: 432447 sec Crashes Since Last Report: 7 Per-App Interval Since Last Report: 2938 sec Per-App Crashes Since Last Report: 5 Anonymous UUID: CC123A77-1407-444A-9081-8A2B7C15C2B6 Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Application Specific Information: objc[70635]: garbage collection is ON Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 com.apple.CoreFoundation 0x00007fff82e0a788 CFRetain + 200 1 com.apple.QuartzCore 0x00007fff81677a98 -[CALayer setSublayers:] + 486 2 com.apple.WebCore 0x00007fff87c792a1 WebCore::GraphicsLayerCA::updateSublayerList() + 433 3 com.apple.WebCore 0x00007fff87c7ebd8 WebCore::GraphicsLayerCA::commitLayerChanges() + 840 4 com.apple.WebCore 0x00007fff87c7ed05 WebCore::GraphicsLayerCA::recursiveCommitChanges() + 21 5 com.apple.WebCore 0x00007fff87c7ed31 WebCore::GraphicsLayerCA::recursiveCommitChanges() + 65 6 com.apple.WebCore 0x00007fff87705296 WebCore::FrameView::paintContents(WebCore::GraphicsContext*, WebCore::IntRect const&) + 390 7 com.apple.WebKit 0x00007fff81b3d205 -[WebFrame(WebInternal) _drawRect:contentsOnly:] + 149 8 com.apple.WebKit 0x00007fff81b3ce77 -[WebHTMLView drawSingleRect:] + 455 9 com.apple.WebKit 0x00007fff81b3cc16 -[WebHTMLView drawRect:] + 566 10 com.apple.AppKit 0x00007fff8597b05e -[NSView _drawRect:clip:] + 3566 11 com.apple.AppKit 0x00007fff85978834 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 2112 12 com.apple.WebKit 0x00007fff81b3dd6b -[WebHTMLView(WebPrivate) _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 299 13 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 14 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 15 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 16 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 17 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 18 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 19 com.apple.AppKit 0x00007fff85977e17 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 254 20 com.apple.AppKit 0x00007fff859746bf -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2683 21 com.apple.AppKit 0x00007fff858edf37 -[NSView displayIfNeeded] + 969 22 com.apple.AppKit 0x00007fff858e8dde _handleWindowNeedsDisplay + 678 23 com.apple.CoreFoundation 0x00007fff82e74427 __CFRunLoopDoObservers + 519 24 com.apple.CoreFoundation 0x00007fff82e502d4 __CFRunLoopRun + 468 25 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575 26 com.apple.HIToolbox 0x00007fff88192a4e RunCurrentEventLoopInMode + 333 27 com.apple.HIToolbox 0x00007fff881927b1 ReceiveNextEventCommon + 148 28 com.apple.HIToolbox 0x00007fff8819270c BlockUntilNextEventMatchingListInMode + 59 29 com.apple.AppKit 0x00007fff858be1f2 _DPSNextEvent + 708 30 com.apple.AppKit 0x00007fff858bdb41 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155 31 com.apple.AppKit 0x00007fff85883747 -[NSApplication run] + 395 32 com.apple.AppKit 0x00007fff8587c468 NSApplicationMain + 364 33 com.yourcompany.wb 0x0000000100001c86 main + 33 (main.m:14) 34 com.yourcompany.wb 0x0000000100001a44 start + 52 Thread 1: Dispatch queue: com.apple.libdispatch-manager 0 libSystem.B.dylib 0x00007fff8874bbba kevent + 10 1 libSystem.B.dylib 0x00007fff8874da85 _dispatch_mgr_invoke + 154 2 libSystem.B.dylib 0x00007fff8874d75c _dispatch_queue_invoke + 185 3 libSystem.B.dylib 0x00007fff8874d286 _dispatch_worker_thread2 + 244 4 libSystem.B.dylib 0x00007fff8874cbb8 _pthread_wqthread + 353 5 libSystem.B.dylib 0x00007fff8874ca55 start_wqthread + 13 Thread 2: JavaScriptCore: FastMalloc scavenger 0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10 1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286 2 com.apple.JavaScriptCore 0x00007fff80ae62b3 WTF::TCMalloc_PageHeap::scavengerThread() + 515 3 com.apple.JavaScriptCore 0x00007fff80ae62f9 WTF::TCMalloc_PageHeap::runScavengerThread(void*) + 9 4 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 5 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 3: 0 libSystem.B.dylib 0x00007fff8874c9da __workq_kernreturn + 10 1 libSystem.B.dylib 0x00007fff8874cdec _pthread_wqthread + 917 2 libSystem.B.dylib 0x00007fff8874ca55 start_wqthread + 13 Thread 4: 0 libSystem.B.dylib 0x00007fff88732e3a mach_msg_trap + 10 1 libSystem.B.dylib 0x00007fff887334ad mach_msg + 59 2 com.apple.CoreFoundation 0x00007fff82e507a2 __CFRunLoopRun + 1698 3 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575 4 com.apple.Foundation 0x00007fff800de4cf +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 297 5 com.apple.Foundation 0x00007fff8005ee99 __NSThread__main__ + 1429 6 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 7 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 5: 0 libSystem.B.dylib 0x00007fff887769e2 select$DARWIN_EXTSN + 10 1 com.apple.CoreFoundation 0x00007fff82e72242 __CFSocketManager + 818 2 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 3 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 6: 0 libSystem.B.dylib 0x00007fff8874c9da __workq_kernreturn + 10 1 libSystem.B.dylib 0x00007fff8874cdec _pthread_wqthread + 917 2 libSystem.B.dylib 0x00007fff8874ca55 start_wqthread + 13 Thread 7: 0 libSystem.B.dylib 0x00007fff8873d426 read + 10 1 com.apple.CoreFoundation 0x00007fff82eb1ae0 __CFSocketRead + 544 2 com.apple.CFNetwork 0x00007fff88bba667 __CFSocketReadWithError(__CFSocket*, unsigned char*, long, CFStreamError*) + 35 3 com.apple.CFNetwork 0x00007fff88bba397 SocketStream::read(__CFReadStream*, unsigned char*, long, CFStreamError*, unsigned char*) + 699 4 com.apple.CoreFoundation 0x00007fff82e3ffac CFReadStreamRead + 540 5 com.apple.CFNetwork 0x00007fff88bd3dc1 HTTPReadFilter::doPlainRead(unsigned char*, long, CFStreamError*, unsigned char*) + 307 6 com.apple.CFNetwork 0x00007fff88bd3c59 HTTPReadFilter::streamRead(__CFReadStream*, unsigned char*, long, CFStreamError*, unsigned char*) + 469 7 com.apple.CoreFoundation 0x00007fff82e3ffac CFReadStreamRead + 540 8 com.apple.CFNetwork 0x00007fff88bd39e6 HTTPNetStreamInfo::streamRead(__CFReadStream*, unsigned char*, long, CFStreamError*, unsigned char*) + 562 9 com.apple.CoreFoundation 0x00007fff82e3ffac CFReadStreamRead + 540 10 com.apple.CFNetwork 0x00007fff88c23892 HTTPReadStream::streamRead(__CFReadStream*, unsigned char*, long, CFStreamError*, unsigned char*) + 82 11 com.apple.CoreFoundation 0x00007fff82e3ffac CFReadStreamRead + 540 12 com.apple.MediaToolbox 0x00007fff86b59a6f FigCFHTTPReadResponse + 855 13 com.apple.CoreFoundation 0x00007fff82eb1503 _signalEventSync + 115 14 com.apple.CoreFoundation 0x00007fff82eb1474 _cfstream_solo_signalEventSync + 116 15 com.apple.CFNetwork 0x00007fff88c228fd HTTPReadStream::streamEvent(unsigned long) + 163 16 com.apple.CoreFoundation 0x00007fff82eb1503 _signalEventSync + 115 17 com.apple.CoreFoundation 0x00007fff82eb1474 _cfstream_solo_signalEventSync + 116 18 com.apple.CoreFoundation 0x00007fff82e52271 __CFRunLoopDoSources0 + 1361 19 com.apple.CoreFoundation 0x00007fff82e50469 __CFRunLoopRun + 873 20 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575 21 com.apple.CoreFoundation 0x00007fff82e4f9b6 CFRunLoopRun + 70 22 com.apple.CoreMedia 0x00007fff803d4702 FigThreadGlobalNetworkBufferingRunloop + 119 23 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 24 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 8: 0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10 1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286 2 com.apple.CoreMedia 0x00007fff803d5947 WaitOnCondition + 14 3 com.apple.CoreMedia 0x00007fff803d5b13 FigSemaphoreWaitRelative + 167 4 com.apple.MediaToolbox 0x00007fff86aee8c7 FigAIORequestThread + 398 5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 9: 0 libSystem.B.dylib 0x00007fff8874c9da __workq_kernreturn + 10 1 libSystem.B.dylib 0x00007fff8874cdec _pthread_wqthread + 917 2 libSystem.B.dylib 0x00007fff8874ca55 start_wqthread + 13 Thread 10: 0 libSystem.B.dylib 0x00007fff88732e3a mach_msg_trap + 10 1 libSystem.B.dylib 0x00007fff887334ad mach_msg + 59 2 com.apple.CoreFoundation 0x00007fff82e507a2 __CFRunLoopRun + 1698 3 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575 4 com.apple.CoreFoundation 0x00007fff82e4f9b6 CFRunLoopRun + 70 5 com.apple.QTKit 0x00007fff830d0c49 QTFigVisualContextImageProviderWorkThread + 342 6 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 7 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 11: 0 libSystem.B.dylib 0x00007fff88732e3a mach_msg_trap + 10 1 libSystem.B.dylib 0x00007fff887334ad mach_msg + 59 2 com.apple.CoreFoundation 0x00007fff82e507a2 __CFRunLoopRun + 1698 3 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575 4 ....audio.toolbox.AudioToolbox 0x00007fff8416267a GenericRunLoopThread::RunLoop() + 42 5 ....audio.toolbox.AudioToolbox 0x00007fff841629f0 GenericRunLoopThread::Run() + 140 6 ....audio.toolbox.AudioToolbox 0x00007fff8412ded5 CAPThread::Entry(CAPThread*) + 67 7 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 8 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 12: 0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10 1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286 2 com.apple.CoreMedia 0x00007fff803d5947 WaitOnCondition + 14 3 com.apple.CoreMedia 0x00007fff803d5b13 FigSemaphoreWaitRelative + 167 4 com.apple.MediaToolbox 0x00007fff86afd4dd faq_EnqueueSourceDataThread + 44 5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 13: 0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10 1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286 2 com.apple.CoreMedia 0x00007fff803d5947 WaitOnCondition + 14 3 com.apple.CoreMedia 0x00007fff803d5b13 FigSemaphoreWaitRelative + 167 4 com.apple.MediaToolbox 0x00007fff86b9b03b activitySchedulerOnThread + 69 5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 14: 0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10 1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286 2 com.apple.CoreMedia 0x00007fff803d5947 WaitOnCondition + 14 3 com.apple.CoreMedia 0x00007fff803d5b13 FigSemaphoreWaitRelative + 167 4 com.apple.MediaToolbox 0x00007fff86b26d49 audioMentorThread + 6000 5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 15: 0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10 1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286 2 com.apple.CoreMedia 0x00007fff803d5947 WaitOnCondition + 14 3 com.apple.CoreMedia 0x00007fff803d5b13 FigSemaphoreWaitRelative + 167 4 com.apple.MediaToolbox 0x00007fff86b3003a videoMentorThread + 5700 5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 16: 0 libSystem.B.dylib 0x00007fff88732e3a mach_msg_trap + 10 1 libSystem.B.dylib 0x00007fff887334ad mach_msg + 59 2 com.apple.CoreFoundation 0x00007fff82e507a2 __CFRunLoopRun + 1698 3 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575 4 com.apple.CoreFoundation 0x00007fff82e4f9b6 CFRunLoopRun + 70 5 com.apple.QTKit 0x00007fff830cfad4 QTCALayerRendererPendingQWorkLoop + 534 6 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 7 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 17: 0 libSystem.B.dylib 0x00007fff88732e76 semaphore_wait_trap + 10 1 com.apple.VideoToolbox 0x00007fff80487f25 JVTLib_100988 + 11 2 com.apple.VideoToolbox 0x00007fff804d61d8 JVTLib_101021(void*) + 60 3 com.apple.VideoToolbox 0x00007fff804882f4 JVTLib_100971 + 552 4 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 5 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 18: 0 libSystem.B.dylib 0x00007fff88732e76 semaphore_wait_trap + 10 1 com.apple.VideoToolbox 0x00007fff80487f25 JVTLib_100988 + 11 2 com.apple.VideoToolbox 0x00007fff804d61d8 JVTLib_101021(void*) + 60 3 com.apple.VideoToolbox 0x00007fff804882f4 JVTLib_100971 + 552 4 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 5 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 19: 0 libSystem.B.dylib 0x00007fff88732e9a semaphore_timedwait_signal_trap + 10 1 libSystem.B.dylib 0x00007fff887716e2 _pthread_cond_wait + 1015 2 com.apple.CoreVideo 0x00007fff83d2988c CVDisplayLink::waitUntil(unsigned long long) + 252 3 com.apple.CoreVideo 0x00007fff83d28d91 CVDisplayLink::runIOThread() + 619 4 com.apple.CoreVideo 0x00007fff83d28aeb startIOThread(void*) + 139 5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331 6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13 Thread 0 crashed with X86 Thread State (64-bit): rax: 0x0000000000000000 rbx: 0x0000000000000000 rcx: 0x0000000000000000 rdx: 0x0000000000000018 rdi: 0x0000000000000000 rsi: 0x000000020070f7d8 rbp: 0x00007fff5fbfbcf0 rsp: 0x00007fff5fbfbce0 r8: 0x00000001010e48d0 r9: 0x000000000000f740 r10: 0x00000001010e42f0 r11: 0x00007fff87d9ca50 r12: 0x0000000101238600 r13: 0x0000000000000000 r14: 0x000000020070f7c0 r15: 0x0000000000000000 rip: 0x00007fff82e0a788 rfl: 0x0000000000000246 cr2: 0x00007fff702c13c8

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• Desigining problem in asp.net?

  - by Surya sasidhar

  hi, in my application i am displaying a image (image size is 90px width,90px height) and below that i displaying title of the image in data list control (horizontal display). i used table (tags) in source code. the image and title will display dynamically from database. my problem is when title is too long it is disturbing my design, when title is too long it should come down, the title should same size as the picture if it is too long it come down in second line. for example the below is a image and below that image title -------------- | | | | | | | | | | |_____________| surya sasidhar rao the above image title is too long. the letters "rao" should come in second line. -------------- | | | | | | | | | | |_____________| surya sasidhar rao this is the desing i want. how can i get it. this is my source code ' CommandName="Play" CommandArgument='<%#Eval("VideoName")+"|"+Eval("videoid")+","+Eval("username")%' Width ="90px" Height ="90px" / ' CommandName="title" CommandArgument='<%#Eval("VideoName")+"|"+Eval("videoid")+","+Eval("username")%' ' '

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• 32bit to 64bit inline assembly porting

  - by Simone Margaritelli

  I have a piece of C++ code (compiled with g++ under a GNU/Linux environment) that load a function pointer (how it does that doesn't matter), pushes some arguments onto the stack with some inline assembly and then calls that function, the code is like : unsigned long stack[] = { 1, 23, 33, 43 }; /* save all the registers and the stack pointer */ unsigned long esp; asm __volatile__ ( "pusha" ); asm __volatile__ ( "mov %%esp, %0" :"=m" (esp)); for( i = 0; i < sizeof(stack); i++ ){ unsigned long val = stack[i]; asm __volatile__ ( "push %0" :: "m"(val) ); } unsigned long ret = function_pointer(); /* restore registers and stack pointer */ asm __volatile__ ( "mov %0, %%esp" :: "m" (esp) ); asm __volatile__ ( "popa" ); I'd like to add some sort of #ifdef _LP64 // 64bit inline assembly #else // 32bit version as above example #endif But i don't know inline assembly for 64bit machines, anyone could help me? Thanks

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• I have having following warning in gcc compilation in 32 bit architecture but not having any such wa

  - by thetna

  symbol.c: In function 'symbol_FPrint': symbol.c:1209: warning: format '%ld' expects type 'long int', but argument 3 has type 'SYMBOL' symbol.c: In function 'symbol_FPrintOtter': symbol.c:1236: warning: format '%ld' expects type 'long int', but argument 3 has type 'SYMBOL' symbol.c:1239: warning: format '%ld' expects type 'long int', but argument 3 has type 'SYMBOL' symbol.c:1243: warning: format '%ld' expects type 'long int', but argument 3 has type 'SYMBOL' symbol.c:1266: warning: format '%ld' expects type 'long int', but argument 3 has type 'SYMBOL' In symbol.c 1198 #ifdef CHECK 1199 else { 1200 misc_StartErrorReport(); 1201 misc_ErrorReport("\n In symbol_FPrint: Cannot print symbol.\n"); 1202 misc_FinishErrorReport(); 1203 } 1204 #endif 1205 } 1206 else if (symbol_SignatureExists()) 1207 fputs(symbol_Name(Symbol), File); 1208 else 1209 fprintf(File, "%ld", Symbol); 1210 } And SYMBOL is defined as: typedef size_t SYMBOL When i replaced '%ld' with '%zu' , i got the following warning: symbol.c: In function 'symbol_FPrint': symbol.c:1209: warning: ISO C90 does not support the 'z' printf length modifier Note: From here it has been edited on 26th of march 2010 and and following problem has beeen added because of its similarity to the above mentioned problem. I have following statement: printf("\n\t %4d:%4d:%4d:%4d:%4d:%s:%d", Index, S->info, S->weight, Precedence[Index],S->props,S->name, S->length); The warning I get while compiling in 64 bit architecture is : format ‘%4d’ expects type ‘int’, but argument 5 has type ‘size_t’ here are the definitions of parameter: NAT props; typedef unsigned int NAT; How can i get rid of this so that i can compile without warning in 32 and 64 bit architecture? What can be its solution?

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• Python TEA implementation

  - by Gaks

  Anybody knows proper python implementation of TEA (Tiny Encryption Algorithm)? I tried the one I've found here: http://sysadminco.com/code/python-tea/ - but it does not seem to work properly. It returns different results than other implementations in C or Java. I guess it's caused by completely different data types in python (or no data types in fact). Here's the code and an example: def encipher(v, k): y=v[0];z=v[1];sum=0;delta=0x9E3779B9;n=32 w=[0,0] while(n>0): y += (z << 4 ^ z >> 5) + z ^ sum + k[sum & 3] y &= 4294967295L # maxsize of 32-bit integer sum += delta z += (y << 4 ^ y >> 5) + y ^ sum + k[sum>>11 & 3] z &= 4294967295L n -= 1 w[0]=y; w[1]=z return w def decipher(v, k): y=v[0] z=v[1] sum=0xC6EF3720 delta=0x9E3779B9 n=32 w=[0,0] # sum = delta<<5, in general sum = delta * n while(n>0): z -= (y << 4 ^ y >> 5) + y ^ sum + k[sum>>11 & 3] z &= 4294967295L sum -= delta y -= (z << 4 ^ z >> 5) + z ^ sum + k[sum&3] y &= 4294967295L n -= 1 w[0]=y; w[1]=z return w Python example: >>> import tea >>> key = [0xbe168aa1, 0x16c498a3, 0x5e87b018, 0x56de7805] >>> v = [0xe15034c8, 0x260fd6d5] >>> res = tea.encipher(v, key) >>> "%X %X" % (res[0], res[1]) **'70D16811 F935148F'** C example: #include <unistd.h> #include <stdio.h> void encipher(unsigned long *const v,unsigned long *const w, const unsigned long *const k) { register unsigned long y=v[0],z=v[1],sum=0,delta=0x9E3779B9, a=k[0],b=k[1],c=k[2],d=k[3],n=32; while(n-->0) { sum += delta; y += (z << 4)+a ^ z+sum ^ (z >> 5)+b; z += (y << 4)+c ^ y+sum ^ (y >> 5)+d; } w[0]=y; w[1]=z; } int main() { unsigned long v[] = {0xe15034c8, 0x260fd6d5}; unsigned long key[] = {0xbe168aa1, 0x16c498a3, 0x5e87b018, 0x56de7805}; unsigned long res[2]; encipher(v, res, key); printf("%X %X\n", res[0], res[1]); return 0; } $ ./tea **D6942D68 6F87870D** Please note, that both examples were run with the same input data (v and key), but results were different. I'm pretty sure C implementation is correct - it comes from a site referenced by wikipedia (I couldn't post a link to it because I don't have enough reputation points yet - some antispam thing)

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• Why isn't the reference counter in boost::shared_ptr volatile?

  - by Johann Gerell

  In the boost::shared_ptr destructor, this is done: if(--*pn == 0) { boost::checked_delete(px); delete pn; } where pn is a pointer to the reference counter, which is typedefed as shared_ptr::count_type -> detail::atomic_count -> long I would have expected the long to be volatile long, given threaded usage and the non-atomic 0-check-and-deletion in the shared_ptr destructor above. Why isn't it volatile?

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• Formatting the BASH command prompt

  - by Robert S. Barnes

  I would like to change the formatting on my BASH prompt from this: [email protected]:~/some/very/annoying/long/path$ to something like this: [email protected]:~/some/very/annoying/long/path $ The idea is that I would be able to type a reasonably long command on one line without it wrapping to the next line so quickly.

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• Hibernate annotated many-to-one not adding child to parent Collection

  - by Rob Hruska

  I have the following annotated Hibernate entity classes: @Entity public class Cat { @Column(name = "ID") @GeneratedValue(strategy = GenerationType.AUTO) @Id private Long id; @OneToMany(mappedBy = "cat", cascade = CascadeType.ALL, fetch = FetchType.EAGER) private Set<Kitten> kittens = new HashSet<Kitten>(); public void setId(Long id) { this.id = id; } public Long getId() { return id; } public void setKittens(Set<Kitten> kittens) { this.kittens = kittens; } public Set<Kitten> getKittens() { return kittens; } } @Entity public class Kitten { @Column(name = "ID") @GeneratedValue(strategy = GenerationType.AUTO) @Id private Long id; @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER) private Cat cat; public void setId(Long id) { this.id = id; } public Long getId() { return id; } public void setCat(Cat cat) { this.cat = cat; } public Cat getCat() { return cat; } } My intention here is a bidirectional one-to-many/many-to-one relationship between Cat and Kitten, with Kitten being the "owning side". What I want to happen is when I create a new Cat, followed by a new Kitten referencing the Cat, the Set of kittens on my Cat should contain the new Kitten. However, this does not happen in the following test: @Test public void testAssociations() { Session session = HibernateUtil.getSessionFactory().getCurrentSession(); Transaction tx = session.beginTransaction(); Cat cat = new Cat(); session.save(cat); Kitten kitten = new Kitten(); kitten.setCat(cat); session.save(kitten); tx.commit(); assertNotNull(kitten.getCat()); assertEquals(cat.getId(), kitten.getCat().getId()); assertTrue(cat.getKittens().size() == 1); // <-- ASSERTION FAILS assertEquals(kitten, new ArrayList<Kitten>(cat.getKittens()).get(0)); } Even after re-querying the Cat, the Set is still empty: // added before tx.commit() and assertions cat = (Cat)session.get(Cat.class, cat.getId()); Am I expecting too much from Hibernate here? Or is the burden on me to manage the Collection myself? The (Annotations) documentation doesn't make any indication that I need to create convenience addTo*/removeFrom* methods on my parent object. Can someone please enlighten me on what my expectations should be from Hibernate with this relationship? Or if nothing else, point me to the correct Hibernate documentation that tells me what I should be expecting to happen here. What do I need to do to make the parent Collection automatically contain the child Entity?

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• Trying to calculate the 10001st prime number in Java.

  - by user247679

  Greetings. I am doing Problem 7 from Project Euler. What I am supposed to do is calculate the 10001st prime number. (A prime number being a number that is only divisible by itself and one.) Here is my current program: public class Problem7 { public static void main(String args []){ long numberOfPrimes = 0; long number = 2; while (numberOfPrimes < 10001){ if(isPrime(number)){ numberOfPrimes++; } number++; } System.out.println("10001st prime: "+ number); } public static boolean isPrime(long N) { if (N <= 1) return false; else return Prime(N,N-1); } public static boolean Prime(long X,long Y) { if (Y == 1) return true; else if (X % Y == 0) return false; else return Prime(X, Y-1); } } It works okay with finding, say the 100th prime number, but when I enter very large numbers such as 10001 it causes a stack overflow. Does anyone know of a way to fix this? Thanks for reading my problem!

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