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  • Emulating old-school sprite flickering (theory and concept)

    - by Jeffrey Kern
    I'm trying to develop an oldschool NES-style video game, with sprite flickering and graphical slowdown. I've been thinking of what type of logic I should use to enable such effects. I have to consider the following restrictions if I want to go old-school NES style: No more than 64 sprites on the screen at a time No more than 8 sprites per scanline, or for each line on the Y axis If there is too much action going on the screen, the system freezes the image for a frame to let the processor catch up with the action From what I've read up, if there were more than 64 sprites on the screen, the developer would only draw high-priority sprites while ignoring low-priority ones. They could also alternate, drawing each even numbered sprite on opposite frames from odd numbered ones. The scanline issue is interesting. From my testing, it is impossible to get good speed on the XBOX 360 XNA framework by drawing sprites pixel-by-pixel, like the NES did. This is why in old-school games, if there were too many sprites on a single line, some would appear if they were cut in half. For all purposes for this project, I'm making scanlines be 8 pixels tall, and grouping the sprites together per scanline by their Y positioning. So, dumbed down I need to come up with a solution that.... 64 sprites on screen at once 8 sprites per 'scanline' Can draw sprites based on priority Can alternate between sprites per frame Emulate slowdown Here is my current theory First and foremost, a fundamental idea I came up with is addressing sprite priority. Assuming values between 0-255 (0 being low), I can assign sprites priority levels, for instance: 0 to 63 being low 63 to 127 being medium 128 to 191 being high 192 to 255 being maximum Within my data files, I can assign each sprite to be a certain priority. When the parent object is created, the sprite would randomly get assigned a number between its designated range. I would then draw sprites in order from high to low, with the end goal of drawing every sprite. Now, when a sprite gets drawn in a frame, I would then randomly generate it a new priority value within its initial priority level. However, if a sprite doesn't get drawn in a frame, I could add 32 to its current priority. For example, if the system can only draw sprites down to a priority level of 135, a sprite with an initial priority of 45 could then be drawn after 3 frames of not being drawn (45+32+32+32=141) This would, in theory, allow sprites to alternate frames, allow priority levels, and limit sprites to 64 per screen. Now, the interesting question is how do I limit sprites to only 8 per scanline? I'm thinking that if I'm sorting the sprites high-priority to low-priority, iterate through the loop until I've hit 64 sprites drawn. However, I shouldn't just take the first 64 sprites in the list. Before drawing each sprite, I could check to see how many sprites were drawn in it's respective scanline via counter variables . For example: Y-values between 0 to 7 belong to Scanline 0, scanlineCount[0] = 0 Y-values between 8 to 15 belong to Scanline 1, scanlineCount[1] = 0 etc. I could reset the values per scanline for every frame drawn. While going down the sprite list, add 1 to the scanline's respective counter if a sprite gets drawn in that scanline. If it equals 8, don't draw that sprite and go to the sprite with the next lowest priority. SLOWDOWN The last thing I need to do is emulate slowdown. My initial idea was that if I'm drawing 64 sprites per frame and there's still more sprites that need to be drawn, I could pause the rendering by 16ms or so. However, in the NES games I've played, sometimes there's slowdown if there's not any sprite flickering going on whereas the game moves beautifully even if there is some sprite flickering. Perhaps give a value to each object that uses sprites on the screen (like the priority values above), and if the combined values of all objects w/ sprites surpass a threshold, introduce the sprite flickering? IN CONCLUSION... Does everything I wrote actually sound legitimate and could work, or is it a pipe dream? What improvements can you all possibly think with this game programming theory of mine?

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  • Odd tcp deadlock under windows

    - by John Robertson
    We are moving large amounts of data on a LAN and it has to happen very rapidly and reliably. Currently we use windows TCP as implemented in C++. Using large (synchronous) sends moves the data much faster than a bunch of smaller (synchronous) sends but will frequently deadlock for large gaps of time (.15 seconds) causing the overall transfer rate to plummet. This deadlock happens in very particular circumstances which makes me believe it should be preventable altogether. More importantly if we don't really know the cause we don't really know it won't happen some time with smaller sends anyway. Can anyone explain this deadlock? Deadlock description (OK, zombie-locked, it isn't dead, but for .15 or so seconds it stops, then starts again) The receiving side sends an ACK. The sending side sends a packet containing the end of a message (push flag is set) The call to socket.recv takes about .15 seconds(!) to return About the time the call returns an ACK is sent by the receiving side The the next packet from the sender is finally sent (why is it waiting? the tcp window is plenty big) The odd thing about (3) is that typically that call doesn't take much time at all and receives exactly the same amount of data. On a 2Ghz machine that's 300 million instructions worth of time. I am assuming the call doesn't (heaven forbid) wait for the received data to be acked before it returns, so the ack must be waiting for the call to return, or both must be delayed by something else. The problem NEVER happens when there is a second packet of data (part of the same message) arriving between 1 and 2. That part very clearly makes it sound like it has to do with the fact that windows TCP will not send back a no-data ACK until either a second packet arrives or a 200ms timer expires. However the delay is less than 200 ms (its more like 150 ms). The third unseemly character (and to my mind the real culprit) is (5). Send is definitely being called well before that .15 seconds is up, but the data NEVER hits the wire before that ack returns. That is the most bizarre part of this deadlock to me. Its not a tcp blockage because the TCP window is plenty big since we set SO_RCVBUF to something like 500*1460 (which is still under a meg). The data is coming in very fast (basically there is a loop spinning out data via send) so the buffer should fill almost immediately. According to msdn the buffer being full and at least one pending send should cause the data to be sent (though in another place it mentions that there various "heuristics" used in deciding when a send hits the wire). Anway, why the sender doesn't actually send more data during that .15 second pause is the most bizarre part to me. The information above was captured on the receiving side via wireshark (except of course the socket.recv return times which were logged in a text file). We tried changing the send buffer to zero and turning off Nagle on the sender (yes, I know Nagle is about not sending small packets - but we tried turning Nagle off in case that was part of the unstated "heuristics" affecting whether the message would be posted to the wire. Technically microsoft's Nagle is that a small packet isn't sent if the buffer is full and there is an outstanding ACK, so it seemed like a possibility).

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  • Mysql performance problem & Failed DIMM

    - by murdoch
    Hi I have a dedicated mysql database server which has been having some performance problems recently, under normal load the server will be running fine, then suddenly out of the blue the performance will fall off a cliff. The server isn't using the swap file and there is 12GB of RAM in the server, more than enough for its needs. After contacting my hosting comapnies support they have discovered that there is a failed 2GB DIMM in the server and have scheduled to replace it tomorow morning. My question is could a failed DIMM result in the performance problems I am seeing or is this just coincidence? My worry is that they will replace the ram tomorrow but the problems will persist and I will still be lost of explanations so I am just trying to think ahead. The reason I ask is that there is plenty of RAM in the server, more than required and simply missing 2GB should be a problem, so if this failed DIMM is causing these performance problems then the OS must be trying to access the failed DIMM and slowing down as a result. Does that sound like a credible explanation? This is what DELLs omreport program says about the RAM, notice one dimm is "Critical" Memory Information Health : Critical Memory Operating Mode Fail Over State : Inactive Memory Operating Mode Configuration : Optimizer Attributes of Memory Array(s) Attributes : Location Memory Array 1 : System Board or Motherboard Attributes : Use Memory Array 1 : System Memory Attributes : Installed Capacity Memory Array 1 : 12288 MB Attributes : Maximum Capacity Memory Array 1 : 196608 MB Attributes : Slots Available Memory Array 1 : 18 Attributes : Slots Used Memory Array 1 : 6 Attributes : ECC Type Memory Array 1 : Multibit ECC Total of Memory Array(s) Attributes : Total Installed Capacity Value : 12288 MB Attributes : Total Installed Capacity Available to the OS Value : 12004 MB Attributes : Total Maximum Capacity Value : 196608 MB Details of Memory Array 1 Index : 0 Status : Ok Connector Name : DIMM_A1 Type : DDR3-Registered Size : 2048 MB Index : 1 Status : Ok Connector Name : DIMM_A2 Type : DDR3-Registered Size : 2048 MB Index : 2 Status : Ok Connector Name : DIMM_A3 Type : DDR3-Registered Size : 2048 MB Index : 3 Status : Critical Connector Name : DIMM_B1 Type : DDR3-Registered Size : 2048 MB Index : 4 Status : Ok Connector Name : DIMM_B2 Type : DDR3-Registered Size : 2048 MB Index : 5 Status : Ok Connector Name : DIMM_B3 Type : DDR3-Registered Size : 2048 MB the command free -m shows this, the server seems to be using more than 10GB of ram which would suggest it is trying to use the DIMM total used free shared buffers cached Mem: 12004 10766 1238 0 384 4809 -/+ buffers/cache: 5572 6432 Swap: 2047 0 2047 iostat output while problem is occuring avg-cpu: %user %nice %system %iowait %steal %idle 52.82 0.00 11.01 0.00 0.00 36.17 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 47.00 0.00 576.00 0 576 sda1 0.00 0.00 0.00 0 0 sda2 1.00 0.00 32.00 0 32 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 46.00 0.00 544.00 0 544 avg-cpu: %user %nice %system %iowait %steal %idle 53.12 0.00 7.81 0.00 0.00 39.06 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 49.00 0.00 592.00 0 592 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 49.00 0.00 592.00 0 592 avg-cpu: %user %nice %system %iowait %steal %idle 56.09 0.00 7.43 0.37 0.00 36.10 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 232.00 0.00 64520.00 0 64520 sda1 0.00 0.00 0.00 0 0 sda2 159.00 0.00 63728.00 0 63728 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 73.00 0.00 792.00 0 792 avg-cpu: %user %nice %system %iowait %steal %idle 52.18 0.00 9.24 0.06 0.00 38.51 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 49.00 0.00 600.00 0 600 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 49.00 0.00 600.00 0 600 avg-cpu: %user %nice %system %iowait %steal %idle 54.82 0.00 8.64 0.00 0.00 36.55 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 100.00 0.00 2168.00 0 2168 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 100.00 0.00 2168.00 0 2168 avg-cpu: %user %nice %system %iowait %steal %idle 54.78 0.00 6.75 0.00 0.00 38.48 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 84.00 0.00 896.00 0 896 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 84.00 0.00 896.00 0 896 avg-cpu: %user %nice %system %iowait %steal %idle 54.34 0.00 7.31 0.00 0.00 38.35 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 81.00 0.00 840.00 0 840 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 81.00 0.00 840.00 0 840 avg-cpu: %user %nice %system %iowait %steal %idle 55.18 0.00 5.81 0.44 0.00 38.58 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 317.00 0.00 105632.00 0 105632 sda1 0.00 0.00 0.00 0 0 sda2 224.00 0.00 104672.00 0 104672 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 93.00 0.00 960.00 0 960 avg-cpu: %user %nice %system %iowait %steal %idle 55.38 0.00 7.63 0.00 0.00 36.98 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 74.00 0.00 800.00 0 800 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 74.00 0.00 800.00 0 800 avg-cpu: %user %nice %system %iowait %steal %idle 56.43 0.00 7.80 0.00 0.00 35.77 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 72.00 0.00 784.00 0 784 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 72.00 0.00 784.00 0 784 avg-cpu: %user %nice %system %iowait %steal %idle 54.87 0.00 6.49 0.00 0.00 38.64 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 80.20 0.00 855.45 0 864 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 80.20 0.00 855.45 0 864 avg-cpu: %user %nice %system %iowait %steal %idle 57.22 0.00 5.69 0.00 0.00 37.09 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 33.00 0.00 432.00 0 432 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 33.00 0.00 432.00 0 432 avg-cpu: %user %nice %system %iowait %steal %idle 56.03 0.00 7.93 0.00 0.00 36.04 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 41.00 0.00 560.00 0 560 sda1 0.00 0.00 0.00 0 0 sda2 2.00 0.00 88.00 0 88 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 39.00 0.00 472.00 0 472 avg-cpu: %user %nice %system %iowait %steal %idle 55.78 0.00 5.13 0.00 0.00 39.09 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 29.00 0.00 392.00 0 392 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 29.00 0.00 392.00 0 392 avg-cpu: %user %nice %system %iowait %steal %idle 53.68 0.00 8.30 0.06 0.00 37.95 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 78.00 0.00 4280.00 0 4280 sda1 0.00 0.00 0.00 0 0 sda2 0.00 0.00 0.00 0 0 sda3 0.00 0.00 0.00 0 0 sda4 0.00 0.00 0.00 0 0 sda5 78.00 0.00 4280.00 0 4280

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  • Xcode - "Preference Pane" project - how to access bundle?

    - by Nippysaurus
    I have created a "Preference Pane" project. In this project I would like to load an image from my bundles resources folder. This seems difficult because "[NSBundle mainBundle]" seems to return the following: 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </Applications/System Preferences.app> (loaded) Iterating through "[NSBundle allBundles]" reveals that my projects bundle appears, but does not appear to be loaded: 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Mouse.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Sound.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Spotlight.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/TimeMachine.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </Library/PreferencePanes/DivX.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Trackpad.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/UniversalAccessPref.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Dock.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/DateAndTime.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Keyboard.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/MobileMe.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/FibreChannel.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Appearance.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/DigiHubDiscs.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Ink.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Security.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/EnergySaver.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Speech.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </Users/michael/Library/PreferencePanes/MyPrefPane.prefPane> (loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </Users/michael/Code/MyPrefPane/build/Debug/MyPrefPane.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/SharingPref.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Expose.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/SoftwareUpdate.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/ParentalControls.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/PrintAndFax.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Accounts.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/DesktopScreenEffectsPref.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Bluetooth.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Localization.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/StartupDisk.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Network.prefPane> (not yet loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </Applications/System Preferences.app> (loaded) 27/12/10 9:24:18 PM System Preferences[5076] NSBundle </System/Library/PreferencePanes/Displays.prefPane> (not yet loaded) I'm not sure whats going on here. How can I access my prefpane bundle?

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  • How to optimize this JSON/JQuery/Javascript function in IE7/IE8?

    - by melaos
    hi guys, i'm using this function to parse this json data but i find the function to be really slow in IE7 and slightly slow in IE8. basically the first listbox generate the main product list, and upon selection of the main list, it will populate the second list. this is my data: [{"ProductCategoryId":209,"ProductCategoryName":"X-Fi","ProductSubCategoryId":668,"ProductSubCategoryName":"External Solutions","ProductId":15913,"ProductName":"Creative Xmod","ProductServiceLifeId":1},{"ProductCategoryId":209,"ProductCategoryName":"X-Fi","ProductSubCategoryId":668,"ProductSubCategoryName":"External Solutions","ProductId":15913,"ProductName":"Creative Xmod","ProductServiceLifeId":1},{"ProductCategoryId":209,"ProductCategoryName":"X-Fi","ProductSubCategoryId":668,"ProductSubCategoryName":"External Solutions","ProductId":18094,"ProductName":"Sound Blaster Wireless Receiver","ProductServiceLifeId":1},{"ProductCategoryId":209,"ProductCategoryName":"X-Fi","ProductSubCategoryId":668,"ProductSubCategoryName":"External Solutions","ProductId":16185,"ProductName":"Xdock Wireless","ProductServiceLifeId":1},{"ProductCategoryId":209,"ProductCategoryName":"X-Fi","ProductSubCategoryId":668,"ProductSubCategoryName":"External Solutions","ProductId":16186,"ProductName":"Xmod Wireless","ProductServiceLifeId":1}] and these are the functions that i'm using: //Three Product Panes function function populateMainPane() { $.getJSON('/Home/ThreePaneProductData/', function(data) { products = data; alert(JSON.stringify(products)); var prodCategory = {}; for (i = 0; i < products.length; i++) { prodCategory[products[i].ProductCategoryId] = products[i].ProductCategoryName; } //end for //take only unique product category to be used var id = 0; for (id in prodCategory) { if (prodCategory.hasOwnProperty(id)) { $(".LBox1").append("<option value='" + id + "'>" + prodCategory[id] + "</option>"); //alert(prodCategory[id]); } } var url = document.location.href; var parms = url.substring(url.indexOf("?") + 1).split("&"); for (var i = 0; i < parms.length; i++) { var parm = parms[i].split("="); if (parm[0].toLowerCase() == "pid") { $(".PanelProductReg").show(); var nProductIds = parm[1].split(","); for (var k = 0; k < nProductIds.length; k++) { var nProductId = parseInt(nProductIds[k], 10); for (var j = 0; j < products.length; j++) { if (nProductId == parseInt(products[j].ProductId, 10)) { addProductRow(nProductId, products[j].ProductName); j = products.length; } } //end for } } } }); } //end function function populateSubCategoryPane() { var subCategory = {}; for (var i = 0; i < products.length; i++) { if (products[i].ProductCategoryId == $('.LBox1').val()) subCategory[products[i].ProductSubCategoryId] = products[i].ProductSubCategoryName; } //end for //clear off the list box first $(".LBox2").html(""); var id = 0; for (id in subCategory) { if (subCategory.hasOwnProperty(id)) { $(".LBox2").append("<option value='" + id + "'>" + subCategory[id] + "</option>"); //alert(prodCategory[id]); } } } //end function is there anything i can do to optimize this or is this a known browser issue?

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  • What is the coolest thing you can do in <10 lines of simple code? Help me inspire beginners!

    - by Tom Ritter
    I'm looking for the coolest thing you can do in a few lines of simple code. I'm sure you can write a Mandelbrot set in Haskell in 15 lines but it's difficult to follow. My goal is to inspire students that programming is cool. We know that programming is cool because you can create anything you imagine - it's the ultimate creative outlet. I want to inspire these beginners and get them over as many early-learning humps as I can. Now, my reasons are selfish. I'm teaching an Intro to Computing course to a group of 60 half-engineering, half business majors; all freshmen. They are the students who came from underprivileged High schools. From my past experience, the group is generally split as follows: a few rock-stars, some who try very hard and kind of get it, the few who try very hard and barely get it, and the few who don't care. I want to reach as many of these groups as effectively as I can. Here's an example of how I'd use a computer program to teach: Here's an example of what I'm looking for: a 1-line VBS script to get your computer to talk to you: CreateObject("sapi.spvoice").Speak InputBox("Enter your text","Talk it") I could use this to demonstrate order of operations. I'd show the code, let them play with it, then explain that There's a lot going on in that line, but the computer can make sense of it, because it knows the rules. Then I'd show them something like this: 4(5*5) / 10 + 9(.25 + .75) And you can see that first I need to do is (5*5). Then I can multiply for 4. And now I've created the Object. Dividing by 10 is the same as calling Speak - I can't Speak before I have an object, and I can't divide before I have 100. Then on the other side I first create an InputBox with some instructions for how to display it. When I hit enter on the input box it evaluates or "returns" whatever I entered. (Hint: 'oooooo' makes a funny sound) So when I say Speak, the right side is what to Speak. And I get that from the InputBox. So when you do several things on a line, like: x = 14 + y; You need to be aware of the order of things. First we add 14 and y. Then we put the result (what it evaluates to, or returns) into x. That's my goal, to have a bunch of these cool examples to demonstrate and teach the class while they have fun. I tried this example on my roommate and while I may not use this as the first lesson, she liked it and learned something. Some cool mathematica programs that make beautiful graphs or shapes that are easy to understand would be good ideas and I'm going to look into those. Here are some complicated actionscript examples but that's a bit too advanced and I can't teach flash. What other ideas do you have?

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  • What is Causing this IIS 7 Web Service Sporadic Connectivity Error?

    - by dpalau
    On sporadic occasions we receive the following error when attempting to call an .asmx web service from a .Net client application: "The underlying connection was closed: A connection that was expected to be kept alive was closed by the server. Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host." By sporadic I mean that it might occur zero, once every few days, or a half-dozen times a day for some users. It will never occur for the first web service call of a user. And the subsequent (usually the same) call will always work immediately after the failure. The failures happen across a variety of methods in the service and usually happens between 15-20 seconds (according to the log) from the time of the request. Looking in the IIS site log for the particular call will show one or the other of the following windows error codes: 121: The semaphore timeout period has elapsed. 1236: The network connection was aborted by the local system. Some additional environment details: Running on internal network web farm consisting of two servers running IIS7 on Windows Server 2008 OS. These problems did not occur when running in an older IIS6 web farm of three servers running on Windows Server 2003 (and we use a single IIS6/2003 instance for our development and staging environments with no issues). EDIT: Also, all of these server instances are VMWare virtual machines, not sure if that is a surprise anymore or not. The web service is a .Net 2.0/3.5 compiled .asmx web service that has its own application pool (.Net 2.0, integrated pipeline). Only has Windows Authentication enabled. We have another web service on the farm that uses the same physical path as the primary service, the only difference being that Basic Authentication is enabled. This is used for a portion of our ERP system. Have tried using the same and different application pool - no effect on the error. This site isn't hit as often as the primary site and has never had an error. As mentioned, the error will only happen when called from the .Net client - not from other applications. The client application is always creating a new web service object for each request and setting the service credentials to System.Net.CredentialCache.DefaultCredentials. The application is either deployed locally to a client or run in a Citrix server session. Those users running in Citrix doesn't seem to experience the issue, only locally deployed clients. The Citrix servers and the web farm are located in the same physical location and are located in the same IP range (10.67.xx.xx). Locally deployed clients experiencing the error are located elsewhere (10.105.xx.xx, 10.31.xx.xx). I've checked the OS logs to see if I can see any problems but nothing really sticks out. EDIT: Actually, I myself just ran into the error a little bit ago. I decided to check out the logs again and saw that there was a Security log entry of "Audit Failure" at the 'same' time (IIS log entry at 1:39:59, event log entry at 1:39:50). Not sure if this is a coincidence or not, I'll have to check out the logs of previous errors. I'm probably grasping for straws but the details: Log Name: Security Source: Microsoft-Windows-Security-Auditing Date: 7/8/2009 1:39:50 PM Event ID: 5159 Task Category: Filtering Platform Connection Level: Information Keywords: Audit Failure User: N/A Computer: is071019.<**.net Description: The Windows Filtering Platform has blocked a bind to a local port. Application Information: Process ID: 1260 Application Name: \device\harddiskvolume1\windows\system32\svchost.exe Network Information: Source Address: 0.0.0.0 Source Port: 54802 Protocol: 17 Filter Information: Filter Run-Time ID: 0 Layer Name: Resource Assignment Layer Run-Time ID: 36 I've also tried to use Failed Request Tracing in IIS7 but the service call never actually gets to where FRT can capture it (even though the failure is logged in the web service log). The network infrastructure group said they checked out the DNS and any NIC settings are correct so there is no 'flapping'. Everything pans out. I'm not sure that they checked out any domain controller servers though to see if that could be an issue. Any ideas? Or any other debugging strategies to get to the bottom of this? I'm just the developer in charge of the software and don't really have the knowledge on what to investigate from the networking side of things - although it does sound like a networking issue to me based on what is happening. Thanks in advance for any help.

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  • How do I evaluate my skillset against the current market to see what needs improvement and where my

    - by baijajusav
    First of all, this question may be out of bounds for this site. If so, remove it. I say this because this site seems to be a place for more concrete questions that are not so relative in nature. And before I begin, for those of you whom just prefer a question and not this sort of dialog, here is my question: How can I assess my current skills as a programmer and decide where and what areas to improve upon? That said, here's what I'm asking/talking about, in essence. The market is always in constant flux. As programmers we're always having to learn new things, update our skills, push ourselves into that next project. There's not a very good litmus test that I know of for us to get an idea of where we stand as programmers. I came across this blog post by Jeff Atwood talking about why can't programmers code. Instinctively (and as the post goes on to state) I rushed through the program in about 4 minutes (most of that time was b/c I was hand writing it out. Still, this doesn't really answer the question of where do my skills need to be to succeed in today's world. I real blogs, listen to podcasts, try to keep up on the latest things coming out. It has only been in the past couple of months that I made a decision to pick a focus area for my learning as I can't learn everything and trying to do so is to spread myself too thin. I chose ASP.NET MVC & C#. I plan to stick with Microsoft technologies, not out of some sense of loyalty or stubbornness, but rather because they seem to stream together and have a unifying connection between them. With Windows Phone 7 coming out, it seems that now is the obvious time to pick up WPF and Silverlight as well. Still, if you asked me to code something apart from intellisense and the internet, I probably couldn't get the syntax right. I don't have libraries memorized or know precisely where the classes I use exist within the .Net framework, namely because I haven't had to pull that knowledge out of the air. In a way, I suppose Visual Studio has insulated me, which isn't a good thing, but, at the same time, I've still been able to be productive. I'm working on my own side project to try and help my learning. In doing so, I'm trying to make use of best practices and 3rd party frameworks where I can. I'm using automapper and EF 1.0. I know everyone in the .net community seems to cry foul at the sound of EF 1.0, but I can't say why because I've never used it. There's no lazy loading and that has proven rather annoying; however, aside from that, I haven't had that much of an issue. Granted this is probably because I'm not writing tests as I go (which I'm not doing because I don't know how to test EF in tests and don't really have a clue how to write tests for ASP.NET MVC 1.0). I'm also using a custom membership provider; granted, it's a barebone implementation, but I'm using it still. My thinking in all of this is, while I am neglecting a great many important technologies that are in the mainstream, I'll have a working project in the end. I can come back and add those things after I finish. Doing it all now and at once seems like too much. I know how I work and I don't think I'd ever get it done that way. I've elected to make this a community wiki as I think this question might fight better there. If a moderator disagrees with that choice or the decision to post this here, the just delete the question. I'm not trying to make undue work for anyone. I'm just a programmer trying to assess my where his skills are now and where I should be improving.

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  • If 'Architect' is a dirty word - what's the alternative; when not everyone can actually design a goo

    - by Andras Zoltan
    Now - I'm a developer first and foremost; but whenever I sit down to work on a big project with lots of interlinking components and areas, I will forward-plan my interfaces, base classes etc as best I can - putting on my Architect hat. For a few weeks I've been doing this for a huge project - designing whole swathes of interfaces etc for a business-wide platform that we're developing. The basic structure is a couple of big projects that consists of service and data interfaces, with some basic implementations of all of these. On their own, these assemblies are useless though, as they are simply intended intended as a scaffold on which to build a business-specific implementation (we have a lot of businesses). Therefore, the design of the core platform is absolutely crucial, since consumers of the system are not intended to know which implementation they are actually using. In the past it's not worked so well, but after a few proof-of-concepts and R&D projects this new platform is now growing nicely and is already proving itself. Then somebody else gets involved in the project - he's a TDD man who sees code-level architecture as an irrelevance and is definitely from the camp that 'architect' is a dirty word - I should add that our working relationship is very good despite this :) He's open about the fact that he can't architect in advance and obviously TDD really helps him because it allows him to evolve his systems over time. That I get, and totally understand; but it means that his coding style, basically, doesn't seem to be able to honour the architecture that I've been putting in place. Now don't get me wrong - he's an awesome coder; but the other day he needed to extend one of his components (an implementation of a core interface) to bring in an extra implementation-specific dependency; and in doing so he extended the core interface as well as his implementation (he uses ReSharper), thus breaking the independence of the whole interface. When I pointed out his error to him, he was dismayed. Being test-first, all that mattered to him was that he'd made his tests pass, and just said 'well, I need that dependency, so can't we put it in?'. Of course we could put it in, but I was frustrated that he couldn't see that refactoring the generic interface to incorporate an implementation-specific feature was just wrong! But it is all very Charlie Brown to him (you know the sound the adults make when they're talking to the children) - as far as he's concerned we don't need to worry about it because we can always refactor. The problem is, the culture of test-write-refactor is all very well and good - but not when you're dealing with a platform that is going to be shared out among so many projects that you could never get them all in one place to make the refactorings work. In my opinion, sometimes you actually have to think about what you're doing, and not just let nature take its course. Am I simply fulfilling the role of Architect as a dirty word here? I believe that architecture is important and should be thought about before code gets written; unless it's a particularly small project. But when you're working in a team of people who don't think that way, or even can't think that way how can you actually get this across? Is it a case of simply making the architecture off-limits to changes by other people? I don't want to start having bloody committees just to be able to grow the system; but equally I don't want to be the only one responsible for it all. Do you think the architect role is a waste of time? Is it at odds with TDD and other practises? Can this mix of different practises be made to work, or should I just be a lot less precious (and in so doing allow a generic platform become useless!)? Or do I just lay down the law? Any ideas/experiences/views gratefully received.

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  • How do I handle calls to AudioTrack from jni without crashing?

    - by icecream
    I was trying to write to an AudioTrack from a jni callback, and I get a signal 7 (SIGBUS), fault addr 00000000. I have looked at the Wolf3D example for odroid and they seem to use a android.os.Handler to post a Runnable that will do an update in the correct thread context. I have also tried AttachCurrentThread, but I fail in this case also. It works to play the sound when running from the constructor even if I wrap it in a thread and then post it to the handler. When I do the "same" via a callback from jni it fails. I assume I am braeaking some rules, but I haven't been able to figure out what they are. So far, I haven't found the answer here on SO. So I wonder if anyone knows how this should be done. EDIT: Answered below. The following code is to illustrate the problem. Java: package com.example.jniaudiotrack; import android.app.Activity; import android.media.AudioFormat; import android.media.AudioManager; import android.media.AudioTrack; import android.os.Bundle; import android.os.Handler; import android.util.Log; public class JniAudioTrackActivity extends Activity { AudioTrack mAudioTrack; byte[] mArr; public static final Handler mHandler = new Handler(); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mArr = new byte[2048]; for (int i = 0; i < 2048; i++) { mArr[i] = (byte) (Math.sin(i) * 128); } mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_8BIT, 2048, AudioTrack.MODE_STREAM); mAudioTrack.play(); new Thread(new Runnable() { public void run() { mHandler.post(new Runnable() { public void run() { mAudioTrack.write(mArr, 0, 2048); Log.i(TAG, "*** Handler from constructor ***"); } }); } }).start(); new Thread(new Runnable() { public void run() { audioFunc(); } }).start(); } public native void audioFunc(); @SuppressWarnings("unused") private void audioCB() { mHandler.post(new Runnable() { public void run() { mAudioTrack.write(mArr, 0, 2048); Log.i(TAG, "*** audioCB called ***"); } }); } private static final String TAG = "JniAudioTrackActivity"; static { System.loadLibrary("jni_audiotrack"); } } cpp: #include <jni.h> extern "C" { JNIEXPORT void Java_com_example_jniaudiotrack_JniAudioTrackActivity_audioFunc(JNIEnv* env, jobject obj); } JNIEXPORT void Java_com_example_jniaudiotrack_JniAudioTrackActivity_audioFunc(JNIEnv* env, jobject obj) { JNIEnv* jniEnv; JavaVM* vm; env->GetJavaVM(&vm); vm->AttachCurrentThread(&jniEnv, 0); jclass cls = env->GetObjectClass(obj); jmethodID audioCBID = env->GetMethodID(cls, "audioCB", "()V"); if (!audioCBID) { return; } env->CallVoidMethod(cls, audioCBID); } Trace snippet: I/DEBUG ( 1653): pid: 9811, tid: 9811 >>> com.example.jniaudiotrack <<< I/DEBUG ( 1653): signal 7 (SIGBUS), fault addr 00000000 I/DEBUG ( 1653): r0 00000800 r1 00000026 r2 00000001 r3 00000000 I/DEBUG ( 1653): r4 42385726 r5 41049e54 r6 bee25570 r7 ad00e540 I/DEBUG ( 1653): r8 000040f8 r9 41048200 10 41049e44 fp 00000000 I/DEBUG ( 1653): ip 000000f8 sp bee25530 lr ad02dbb5 pc ad012358 cpsr 20000010 I/DEBUG ( 1653): #00 pc 00012358 /system/lib/libdvm.so

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  • Installing Windows on HP Proliant Servers without SmartStart

    - by Fitzroy
    I have a PXE server for deploying Windows XP and Windows 7 to workstations. The process is as follows: Boot the workstation from the NIC. Workstation sends a DHCP request. DHCP server responds with an IP address and the location of the PXE server. Workstation downloads WinPE image file from PXE server via TFTP Workstation stores WinPE image file in memory and executes it. Once booted into WinPE, I connect to a network share to gain access to either the Windows XP or Windows 7 installation files. A custom script is launched to guide you through the process of formatting and partitioning the hard drive(s) (using DISKPART and FORMAT). Another custom script asks for details such as the hostname to assign to the workstation. The answers provided are used to build an unattended answer file (SIF [Setup Information File] for WinXP and XML for Win7). The Windows setup EXE is launched, passing the unattended answer file to it as a parameter. The Windows XP and Windows 7 installation sources have been customised to include the drivers for our Dell workstations. They also run a number of scripts upon first booting up to install software packages. This process works very well for our workstations and I would now like to use it for building our servers too. The vast majority of our servers are HP Proliant DL360 G6, DL380 G5 and DL380 G6. They’re running Windows Server 2003 (various editions) or 2008 (various editions). To date, we have always built the HP Proliant servers using the SmartStart CD provided. SmartStart does three useful things for us: Setup RAID with HP Array Configuration Utility (ACU). Installs and configures SNMP Installs various HP Tools for Windows (HP Array Configuration Utility, HP Array Diagnostic Utility, HP Proliant Integrated Management Log Viewer, etc) Using SmartStart I have never had to manually download and install Windows drivers for network, sound, video, etc. I'm not sure if this is because SmartStart copies drivers from the CD during setup, or whether Windows just has the drivers natively in its driver CAB. If I abandon the SmartStart CD in favour of my PXE server I would have to do the following: As I wont have access to ACU, I'll configure the RAID (before booting to the PXE server) by pressing F8 (during the boot process) to access Option ROM Configuration for Arrays (ORCA). Installation of SNMP and the HP Tools will have to be installed once the Windows installation is complete using the Proliant Support Pack. Is this method OK? Is there anything that the SmartStart CD does that I'll be unable to do by other means? Are there any disadvantages to not using the SmartStart CD? Many thanks. UPDATE 05/01/12 I’ve been reading through the SmartStart Scripting Toolkit documentation. The scripting toolkit contains command line tools which work within WinPE and can such things as configure BIOS settings, configure an array and setup ILO. I’m personally not too bothered about configuring BIOS settings as I rarely deviate from the defaults (unless the server is to be a Hyper-V host). I’m not too fussed about being able to configure the array from within WinPE, as I’m happy to just press F8 and use Option ROM Configuration for Arrays (ORCA). Although, if it’s easy enough to do, I will explore this further, as it saves time if everything can be configured from within WinPE. One of the nice features all the tools possess is that you can pass input files to them. EG. Configure one server to your requirements, capture its configuration to a file (using the appropriate tool), you can then use the tool on other servers passing the input file with the captured configuration. Array controller drivers appear to be included with the toolkit along with example of how to incorporate them within a WinPE build. I suppose WinPE won’t be able to see logical volumes (I.E 2x physical disks in a RAID 1 configuration) without the array controller drivers? I mentioned in my post that SmartStart normally installs a bunch of Windows HP tools for you. I’ve had a look today, and if you run the SmartStart CD from within Windows all the tools can be installed. Therefore I can do this after the Windows installation is complete. The SmartStart CD appears to contain a lot Windows drivers. I can customise my Windows 2008 source to incorporate these drivers. However, I understand that incorporating an array controller driver is a little different to most drivers. I believe that you have to provide the driver during the very early stages of the Windows setup. I’m working through the Scripting Toolkit documentation to try and work this out...

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  • Resizing Images In a Table Using JavaScript

    - by Abluescarab
    Hey, all. I apologize beforehand if none of this makes sense, or if I sound incompetent... I've been making webpages for a while, but don't know any JavaScript. I am trying to make a webpage for a friend, and he requested if I could write some code to resize the images in the page based on the user's screen resolution. I did some research on this question, and it's kind of similar to this, this, and this. Unfortunately, those articles didn't answer my question entirely because none of the methods described worked. Right now, I have a three-column webpage with 10 images in a table in the left sidebar, and when I use percentages for their sizes, they don't resize right between monitors. As such, I'm trying to write a JavaScript function that changes their sizes after detecting the screen resolution. The code is stripped from my post if I put it all, so I'll just say that each image links to a website and uses a separate image to change color when you hover over it. Would I have to address both images to change their sizes correctly? I use a JavaScript function to switch between them. Anyway, I tried both methods in this article and neither worked for me. If it helps, I'm using Google Chrome, but I'm trying to make this page as cross-browser as possible. Here's the code I have so far in my JavaScript function: function resizeImages() { var w = window.width; var h = window.height; var yuk = document.getElementById('yuk').style; var wb = document.getElementById('wb').style; var tf = document.getElementById('tf').style; var lh = document.getElementById('lh').style; var ko = document.getElementById('ko').style; var gz = document.getElementById('gz').style; var fb = document.getElementById('fb').style; var eg = document.getElementById('eg').style; var dl = document.getElementById('dl').style; var da = document.getElementById('da').style; if (w = "800" && h = "600") { } else if (w = "1024" && h = "768") { } else if (w = "1152" && h = "864") { } else if (w = "1280" && h = "720") { } else if (w = "1280" && h = "768") { } else if (w = "1280" && h = "800") { } else if (w = "1280" && h = "960") { } else if (w = "1280" && h = "1024") { } } Yeah, I don't have much in it because I don't know if I'm doing it right yet. Is this a way I can detect the "width" and "height" properties of a window? The "yuk", "wb", etcetera are the images I'm trying to change the size of. To sum it up: I want to resize images based on screen resolution using JavaScript, but my research attempts have been... futile. I'm sorry if that was long-winded, but thanks ahead of time!

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  • Multiple errors while adding searching to app

    - by Thijs
    Hi, I'm fairly new at iOS programming, but I managed to make a (in my opinion quite nice) app for the app store. The main function for my next update will be a search option for the app. I followed a tutorial I found on the internet and adapted it to fit my app. I got back quite some errors, most of which I managed to fix. But now I'm completely stuck and don't know what to do next. I know it's a lot to ask, but if anyone could take a look at the code underneath, it would be greatly appreciated. Thanks! // // RootViewController.m // GGZ info // // Created by Thijs Beckers on 29-12-10. // Copyright 2010 __MyCompanyName__. All rights reserved. // #import "RootViewController.h" // Always import the next level view controller header(s) #import "CourseCodes.h" @implementation RootViewController @synthesize dataForCurrentLevel, tableViewData; #pragma mark - #pragma mark View lifecycle // OVERRIDE METHOD - (void)viewDidLoad { [super viewDidLoad]; // Go get the data for the app... // Create a custom string that points to the right location in the app bundle NSString *pathToPlist = [[NSBundle mainBundle] pathForResource:@"SCSCurriculum" ofType:@"plist"]; // Now, place the result into the dictionary property // Note that we must retain it to keep it around dataForCurrentLevel = [[NSDictionary dictionaryWithContentsOfFile:pathToPlist] retain]; // Place the top level keys (the program codes) in an array for the table view // Note that we must retain it to keep it around // NSDictionary has a really useful instance method - allKeys // The allKeys method returns an array with all of the keys found in (this level of) a dictionary tableViewData = [[[dataForCurrentLevel allKeys] sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)] retain]; //Initialize the copy array. copyListOfItems = [[NSMutableArray alloc] init]; // Set the nav bar title self.title = @"GGZ info"; //Add the search bar self.tableView.tableHeaderView = searchBar; searchBar.autocorrectionType = UITextAutocorrectionTypeNo; searching = NO; letUserSelectRow = YES; } /* - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; } */ /* - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; } */ /* - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; } */ /* - (void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated]; } */ //RootViewController.m - (void) searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar { searching = YES; letUserSelectRow = NO; self.tableView.scrollEnabled = NO; //Add the done button. self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneSearching_Clicked:)] autorelease]; } - (NSIndexPath *)tableView :(UITableView *)theTableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath { if(letUserSelectRow) return indexPath; else return nil; } //RootViewController.m - (void)searchBar:(UISearchBar *)theSearchBar textDidChange:(NSString *)searchText { //Remove all objects first. [copyListOfItems removeAllObjects]; if([searchText length] &gt; 0) { searching = YES; letUserSelectRow = YES; self.tableView.scrollEnabled = YES; [self searchTableView]; } else { searching = NO; letUserSelectRow = NO; self.tableView.scrollEnabled = NO; } [self.tableView reloadData]; } //RootViewController.m - (void) searchBarSearchButtonClicked:(UISearchBar *)theSearchBar { [self searchTableView]; } - (void) searchTableView { NSString *searchText = searchBar.text; NSMutableArray *searchArray = [[NSMutableArray alloc] init]; for (NSDictionary *dictionary in listOfItems) { NSArray *array = [dictionary objectForKey:@"Countries"]; [searchArray addObjectsFromArray:array]; } for (NSString *sTemp in searchArray) { NSRange titleResultsRange = [sTemp rangeOfString:searchText options:NSCaseInsensitiveSearch]; if (titleResultsRange.length &gt; 0) [copyListOfItems addObject:sTemp]; } [searchArray release]; searchArray = nil; } //RootViewController.m - (void) doneSearching_Clicked:(id)sender { searchBar.text = @""; [searchBar resignFirstResponder]; letUserSelectRow = YES; searching = NO; self.navigationItem.rightBarButtonItem = nil; self.tableView.scrollEnabled = YES; [self.tableView reloadData]; } //RootViewController.m - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { if (searching) return 1; else return [listOfItems count]; } // Customize the number of rows in the table view. - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { if (searching) return [copyListOfItems count]; else { //Number of rows it should expect should be based on the section NSDictionary *dictionary = [listOfItems objectAtIndex:section]; NSArray *array = [dictionary objectForKey:@"Countries"]; return [array count]; } } - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { if(searching) return @""; if(section == 0) return @"Countries to visit"; else return @"Countries visited"; } // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease]; } // Set up the cell... if(searching) cell.text = [copyListOfItems objectAtIndex:indexPath.row]; else { //First get the dictionary object NSDictionary *dictionary = [listOfItems objectAtIndex:indexPath.section]; NSArray *array = [dictionary objectForKey:@"Countries"]; NSString *cellValue = [array objectAtIndex:indexPath.row]; cell.text = cellValue; } return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { //Get the selected country NSString *selectedCountry = nil; if(searching) selectedCountry = [copyListOfItems objectAtIndex:indexPath.row]; else { NSDictionary *dictionary = [listOfItems objectAtIndex:indexPath.section]; NSArray *array = [dictionary objectForKey:@"Countries"]; selectedCountry = [array objectAtIndex:indexPath.row]; } //Initialize the detail view controller and display it. DetailViewController *dvController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:[NSBundle mainBundle]]; dvController.selectedCountry = selectedCountry; [self.navigationController pushViewController:dvController animated:YES]; [dvController release]; dvController = nil; } //RootViewController.m - (void) searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar { //Add the overlay view. if(ovController == nil) ovController = [[OverlayViewController alloc] initWithNibName:@"OverlayView" bundle:[NSBundle mainBundle]]; CGFloat yaxis = self.navigationController.navigationBar.frame.size.height; CGFloat width = self.view.frame.size.width; CGFloat height = self.view.frame.size.height; //Parameters x = origion on x-axis, y = origon on y-axis. CGRect frame = CGRectMake(0, yaxis, width, height); ovController.view.frame = frame; ovController.view.backgroundColor = [UIColor grayColor]; ovController.view.alpha = 0.5; ovController.rvController = self; [self.tableView insertSubview:ovController.view aboveSubview:self.parentViewController.view]; searching = YES; letUserSelectRow = NO; self.tableView.scrollEnabled = NO; //Add the done button. self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneSearching_Clicked:)] autorelease]; } // Override to allow orientations other than the default portrait orientation. - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations. return YES; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Relinquish ownership any cached data, images, etc that aren't in use. } - (void)viewDidUnload { // Relinquish ownership of anything that can be recreated in viewDidLoad or on demand. // For example: self.myOutlet = nil; } - (void)dealloc { [dataForCurrentLevel release]; [tableViewData release]; [super dealloc]; } #pragma mark - #pragma mark Table view methods // DATA SOURCE METHOD - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } // DATA SOURCE METHOD - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // How many rows should be displayed? return [tableViewData count]; } // DELEGATE METHOD - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { // Cell reuse block static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } // Configure the cell's contents - we want the program code, and a disclosure indicator cell.textLabel.text = [tableViewData objectAtIndex:indexPath.row]; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; return cell; } //RootViewController.m - (void)searchBar:(UISearchBar *)theSearchBar textDidChange:(NSString *)searchText { //Remove all objects first. [copyListOfItems removeAllObjects]; if([searchText length] &gt; 0) { [ovController.view removeFromSuperview]; searching = YES; letUserSelectRow = YES; self.tableView.scrollEnabled = YES; [self searchTableView]; } else { [self.tableView insertSubview:ovController.view aboveSubview:self.parentViewController.view]; searching = NO; letUserSelectRow = NO; self.tableView.scrollEnabled = NO; } [self.tableView reloadData]; } //RootViewController.m - (void) doneSearching_Clicked:(id)sender { searchBar.text = @""; [searchBar resignFirstResponder]; letUserSelectRow = YES; searching = NO; self.navigationItem.rightBarButtonItem = nil; self.tableView.scrollEnabled = YES; [ovController.view removeFromSuperview]; [ovController release]; ovController = nil; [self.tableView reloadData]; } // DELEGATE METHOD - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // In any navigation-based application, you follow the same pattern: // 1. Create an instance of the next-level view controller // 2. Configure that instance, with settings and data if necessary // 3. Push it on to the navigation stack // In this situation, the next level view controller is another table view // Therefore, we really don't need a nib file (do you see a CourseCodes.xib? no, there isn't one) // So, a UITableViewController offers an initializer that programmatically creates a view // 1. Create the next level view controller // ======================================== CourseCodes *nextVC = [[CourseCodes alloc] initWithStyle:UITableViewStylePlain]; // 2. Configure it... // ================== // It needs data from the dictionary - the "value" for the current "key" (that was tapped) NSDictionary *nextLevelDictionary = [dataForCurrentLevel objectForKey:[tableViewData objectAtIndex:indexPath.row]]; nextVC.dataForCurrentLevel = nextLevelDictionary; // Set the view title nextVC.title = [tableViewData objectAtIndex:indexPath.row]; // 3. Push it on to the navigation stack // ===================================== [self.navigationController pushViewController:nextVC animated:YES]; // Memory manage it [nextVC release]; } /* // Override to support conditional editing of the table view. - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the specified item to be editable. return YES; } */ /* // Override to support editing the table view. - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { // Delete the row from the data source. [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; } else if (editingStyle == UITableViewCellEditingStyleInsert) { // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view. } } */ /* // Override to support rearranging the table view. - (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath { } */ /* // Override to support conditional rearranging of the table view. - (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the item to be re-orderable. return YES; } */ @end

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  • Load balancing using Mina example with Java DSL

    - by Flame_Phoenix
    So, recently I started learning Camel. As part of the process I decided to go through all the examples (listed HERE and available when you DOWNLOAD the package with all the examples and docs) and to see what I could learn. One of the examples, Load Balancing using Mina caught my attention because it uses a Mina in different JVM's and it simulates a load balancer with round robin. I have a few problems with this example. First it uses the Spring DSL, instead of the Java DSL which my project uses and which I find a lot easier to understand now (mainly also because I am used to it). So the first question: is there a version of this example using only the Java DSL instead of the Spring DSL for the routes and the beans? My second questions is code related. The description states, and I quote: Within this demo every ten seconds, a Report object is created from the Camel load balancer server. This object is sent by the Camel load balancer to a MINA server where the object is then serialized. One of the two MINA servers (localhost:9991 and localhost:9992) receives the object and enriches the message by setting the field reply of the Report object. The reply is sent back by the MINA server to the client, which then logs the reply on the console. So, from what I read, I understand that the MINA server 1 (per example) receives a report from the loadbalancer, changes it, and then it sends that report back to some invisible client. Upon checking the code, I see no client java class or XML and when I run, the server simply posts the results on the command line. Where is the client ?? What is this client? In the MINA 1server code presented here: <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:camel="http://camel.apache.org/schema/spring" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd"> <bean id="service" class="org.apache.camel.example.service.Reporting"/> <camelContext xmlns="http://camel.apache.org/schema/spring"> <route id="mina1"> <from uri="mina:tcp://localhost:9991"/> <setHeader headerName="minaServer"> <constant>localhost:9991</constant> </setHeader> <bean ref="service" method="updateReport"/> </route> </camelContext> </beans> I don't understand how the updateReport method magically prints the object on my console. What if I wanted to send message to a third MINA server? How would I do it? (I would have to add a new route, and send it to the URI of the 3rd server correct?) I know most of these questions may sound dumb, but I would appreciate if anyone could help me. A Java DSL version of this would really help me.

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  • Explicit method tables in C# instead of OO - good? bad?

    - by FunctorSalad
    Hi! I hope the title doesn't sound too subjective; I absolutely do not mean to start a debate on OO in general. I'd merely like to discuss the basic pros and cons for different ways of solving the following sort of problem. Let's take this minimal example: you want to express an abstract datatype T with functions that may take T as input, output, or both: f1 : Takes a T, returns an int f2 : Takes a string, returns a T f3 : Takes a T and a double, returns another T I'd like to avoid downcasting and any other dynamic typing. I'd also like to avoid mutation whenever possible. 1: Abstract-class-based attempt abstract class T { abstract int f1(); // We can't have abstract constructors, so the best we can do, as I see it, is: abstract void f2(string s); // The convention would be that you'd replace calls to the original f2 by invocation of the nullary constructor of the implementing type, followed by invocation of f2. f2 would need to have side-effects to be of any use. // f3 is a problem too: abstract T f3(double d); // This doesn't express that the return value is of the *same* type as the object whose method is invoked; it just expresses that the return value is *some* T. } 2: Parametric polymorphism and an auxilliary class (all implementing classes of TImpl will be singleton classes): abstract class TImpl<T> { abstract int f1(T t); abstract T f2(string s); abstract T f3(T t, double d); } We no longer express that some concrete type actually implements our original spec -- an implementation is simply a type Foo for which we happen to have an instance of TImpl. This doesn't seem to be a problem: If you want a function that works on arbitrary implementations, you just do something like: // Say we want to return a Bar given an arbitrary implementation of our abstract type Bar bar<T>(TImpl<T> ti, T t); At this point, one might as well skip inheritance and singletons altogether and use a 3 First-class function table class /* or struct, even */ TDictT<T> { readonly Func<T,int> f1; readonly Func<string,T> f2; readonly Func<T,double,T> f3; TDict( ... ) { this.f1 = f1; this.f2 = f2; this.f3 = f3; } } Bar bar<T>(TDict<T> td; T t); Though I don't see much practical difference between #2 and #3. Example Implementation class MyT { /* raw data structure goes here; this class needn't have any methods */ } // It doesn't matter where we put the following; could be a static method of MyT, or some static class collecting dictionaries static readonly TDict<MyT> MyTDict = new TDict<MyT>( (t) => /* body of f1 goes here */ , // f2 (s) => /* body of f2 goes here */, // f3 (t,d) => /* body of f3 goes here */ ); Thoughts? #3 is unidiomatic, but it seems rather safe and clean. One question is whether there are any performance concerns with it. I don't usually need dynamic dispatch, and I'd prefer if these function bodies get statically inlined in places where the concrete implementing type is known statically. Is #2 better in that regard?

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  • Survey Data Model - How to avoid EAV and excessive denormalization?

    - by AlexDPC
    Hi everyone, My database skills are mediocre at best and I have to design a data model for survey data. I have spent some thoughts on this and right now I feel that I am stuck between some kind of EAV model and a design involving hundreds of tables, each with hundreds of columns (and thousands of records). There must be a better way to do this and I hope that the wise folks on this forum can help me. I have already searched various forums, but I couldn't really find a solution. If it has already been given elsewhere, please excuse me and provide me with a link so I can read it up. Some assumptions about the data I have to deal with: Each survey consists of 1 to n questionnaires Each questionnaire consists of 100-2,000 questions (please ignore that 2,000 questions really sound like a lot to answer...) Questions can be of various types: multiple-choice, free text, a number (like age, income, percentages, ...) Each survey involves 10-200 countries (These are not the respondents. The respondents are actually people in the countries.) Depending on the type of questionnaire, each questionnaire is answered by 100-20,000 respondents per country. A country can adapt the questionnaires for a survey, i.e. add, remove or edit questions The data for one country is gathered in a separate database in that country. There is no possibility for online integration from the start. The data for all countries has to be integrated later. This means for example, if a country has deleted a question, that data must somehow be derived from what they sent in order to achieve a uniform design across all countries I will have to write the integration and cleaning software, which will need to work with every country's data In the end the data needs to be exported to flat files, one rectangular grid per country and questionnaire. I have already discussed this topic with people from various backgrounds and have not come to a good solution yet. I mainly got two kinds of opinions. The domain experts, who are used to working with flat files (spreadsheet-style) for data processing and analysis vote for a denormalized structure with loads of tables and columns as I described above (1 table per country and questionnaire). This sounds terrible to me, because I learned that wide tables are to be avoided, it will be annoying to determine which columns are actually in a table when working with it, the database will become cluttered with hundreds of tables (or I even need to set up multiple databases, each with a similar yet a bit differetn design), etc. O-O-programmers vote for a strongly "normalized" design, which would effectively lead to a central table containing all the answers from all respondents to all questions. This table would either need to contain a column of type sql_variant type or multiple answer columns with different types to store answers of different types (multiple choice, free text, ..). The former would essentially be a EAV model. I tend to follow Joe Celko here, who strongly discourages its use (he calls it OTLT or "One True Lookup Table"). The latter would imply that each row would contain null cells for the not applicable types by design. Another alternative I could think of would be to create one table per answer type, i.e., one for multiple-choice questions, one for free text questions, etc.. That's not so generic, it would lead to a lot of union joins, I think and I would have to add a table if a new answer type is invented. Sorry for boring you with all this text and thank you for your input! Cheers, Alex PS: I asked the same question here: http://www.eggheadcafe.com/community/aspnet/13/10242616/survey-data-model--how-to-avoid-eav-and-excessive-denormalization.aspx

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  • Screen Casting using ffmpeg (too fast)

    - by rowman
    I can use ffmpeg to make screen casts: ffmpeg -f x11grab -s 1280x800 -i :0.0 -c:v libx264 -framerate 30 -r 30 -crf 18 out.mkv However the output comes out to be too fast paced. It also happens with GTK RecordMyDesktop if I enable the encode on the fly. So, the questions is how to get a normal video pace. Also in order to capture the sound with ffmpeg what option should be used? FFmpeg Output: ffmpeg -f x11grab -s 1280x800 -r 30 -i :0.0 -c:v libx264 -framerate 30 -r 30 -crf 18 out.mkv ffmpeg version N-35162-g87244c8 Copyright (c) 2000-2012 the FFmpeg developers built on Oct 7 2012 15:56:19 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5) configuration: --enable-gpl --enable-libfaac --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-x11grab --enable-libx264 --enable-nonfree --enable-version3 libavutil 51. 73.102 / 51. 73.102 libavcodec 54. 64.100 / 54. 64.100 libavformat 54. 29.105 / 54. 29.105 libavdevice 54. 3.100 / 54. 3.100 libavfilter 3. 19.102 / 3. 19.102 libswscale 2. 1.101 / 2. 1.101 libswresample 0. 16.100 / 0. 16.100 libpostproc 52. 1.100 / 52. 1.100 [x11grab @ 0xab896a0] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 1280 height: 800 [x11grab @ 0xab896a0] shared memory extension found [x11grab @ 0xab896a0] Estimating duration from bitrate, this may be inaccurate Input #0, x11grab, from ':0.0': Duration: N/A, start: 1350136942.608988, bitrate: 983040 kb/s Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1280x800, 983040 kb/s, 30 tbr, 1000k tbn, 30 tbc [libx264 @ 0xab87320] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowCTZ SlowAtom [libx264 @ 0xab87320] profile High 4:4:4 Predictive, level 3.2, 4:4:4 8-bit [libx264 @ 0xab87320] 264 - core 128 r2 198a7ea - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, matroska, to 'out.mkv': Metadata: encoder : Lavf54.29.105 Stream #0:0: Video: h264, yuv444p, 1280x800, q=-1--1, 1k tbn, 30 tbc Stream mapping: Stream #0:0 -> #0:0 (rawvideo -> libx264) Press [q] to stop, [?] for help frame= 10 fps=0.0 q=0.0 size= 1kB time=00:00:00.00 bitrate= 0.0kbits/sframe= 19 fps= 17 q=0.0 size= 1kB time=00:00:00.00 bitrate= 0.0kbits/sframe= 28 fps= 17 q=0.0 size= 1kB time=00:00:00.00 bitrate= 0.0kbits/sframe= 37 fps= 17 q=0.0 size= 1kB time=00:00:00.00 bitrate= 0.0kbits/sframe= 45 fps= 16 q=0.0 size= 1kB time=00:00:00.00 bitrate= 0.0kbits/sframe= 47 fps= 14 q=0.0 size= 1kB time=00:00:00.00 bitrate= 0.0kbits/sframe= 52 fps= 13 q=24.0 size= 257kB time=00:00:00.00 bitrate=2101632.0kbiframe= 55 fps= 12 q=24.0 size= 257kB time=00:00:00.10 bitrate=20808.2kbitsframe= 59 fps= 11 q=24.0 size= 289kB time=00:00:00.23 bitrate=10145.0kbitsframe= 64 fps= 11 q=24.0 size= 289kB time=00:00:00.40 bitrate=5894.7kbits/frame= 70 fps= 11 q=24.0 size= 289kB time=00:00:00.60 bitrate=3933.1kbits/frame= 72 fps= 10 q=24.0 size= 289kB time=00:00:00.66 bitrate=3549.2kbits/frame= 77 fps=9.8 q=24.0 size= 289kB time=00:00:00.83 bitrate=2837.7kbits/frame= 80 fps=9.6 q=24.0 size= 289kB time=00:00:00.93 bitrate=2533.5kbits/frame= 85 fps=9.3 q=24.0 size= 289kB time=00:00:01.10 bitrate=2146.9kbits/frame= 89 fps=9.3 q=24.0 size= 289kB time=00:00:01.23 bitrate=1917.1kbits/frame= 92 fps=9.1 q=24.0 size= 289kB time=00:00:01.33 bitrate=1773.3kbits/frame= 96 fps=9.0 q=24.0 size= 289kB time=00:00:01.46 bitrate=1612.4kbits/frame= 99 fps=8.8 q=24.0 size= 321kB time=00:00:01.56 bitrate=1676.8kbits/frame= 104 fps=8.7 q=24.0 size= 321kB time=00:00:01.73 bitrate=1515.2kbits/frame= 109 fps=5.3 q=24.0 Lsize= 1093kB time=00:00:03.56 bitrate=2511.5kbits/s video:1092kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.120198% [libx264 @ 0xab87320] frame I:3 Avg QP:18.93 size:142610 [libx264 @ 0xab87320] frame P:43 Avg QP:20.79 size: 15751 [libx264 @ 0xab87320] frame B:63 Avg QP:23.75 size: 195 [libx264 @ 0xab87320] consecutive B-frames: 21.1% 1.8% 11.0% 66.1% [libx264 @ 0xab87320] mb I I16..4: 50.0% 21.1% 28.9% [libx264 @ 0xab87320] mb P I16..4: 6.1% 0.9% 3.2% P16..4: 5.5% 1.2% 0.6% 0.0% 0.0% skip:82.5% [libx264 @ 0xab87320] mb B I16..4: 0.4% 0.1% 0.0% B16..8: 2.9% 0.1% 0.0% direct: 0.0% skip:96.5% L0:40.7% L1:57.0% BI: 2.3% [libx264 @ 0xab87320] 8x8 transform intra:14.5% inter:46.1% [libx264 @ 0xab87320] coded y,u,v intra: 33.5% 24.1% 25.4% inter: 0.9% 0.4% 0.4% [libx264 @ 0xab87320] i16 v,h,dc,p: 70% 26% 1% 3% [libx264 @ 0xab87320] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 21% 30% 5% 7% 5% 7% 4% 10% [libx264 @ 0xab87320] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 35% 12% 2% 4% 3% 4% 3% 5% [libx264 @ 0xab87320] Weighted P-Frames: Y:0.0% UV:0.0% [libx264 @ 0xab87320] ref P L0: 57.0% 5.6% 26.8% 10.6% [libx264 @ 0xab87320] ref B L0: 69.4% 22.6% 8.0% [libx264 @ 0xab87320] ref B L1: 93.7% 6.3% [libx264 @ 0xab87320] kb/s:2460.40

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  • Database Table Schema and Aggregate Roots

    - by bretddog
    Hi, Applicaiton is single user, 1-tier(1 pc), database SqlCE. DataService layer will be (I think) : Repository returning domain objects and quering database with LinqToSql (dbml). There are obviously a lot more columns, this is simplified view. http://img573.imageshack.us/img573/3612/ss20110115171817w.png This is my first attempt of creating a 2 tables database. I think the table schema makes sense, but I need some reassurance or critics. Because the table relations looks quite scary to be honest. I'm hoping you could; Look at the table schema and respond if there are clear signs of troubles or errors that you spot right away.. And if you have time, Look at Program Summary/Questions, and see if the table layout makes makes sense to those points. Please be brutal, I will try to defend :) Program summary: a) A set of categories, each having a set of strategies (1:m) b) Each day a number of items will be produced. And each strategy MAY reference it. (So there can be 50 items, and a strategy may reference 23 of them) c) An item can be referenced by more than one strategy. So I think it's an m:m relation. d) Status values will be logged at fixed time-fractions through the day, for: - .... each Strategy.....each StrategyItem....each item e) An action on an item may be executed by a strategy that reference it. - This is logged as ItemAction (Could have called it StrategyItemAction) User Requsts b) - e) described the main activity mode of the program. To work with only today's DayLog , for each category. 2nd priority activity is retrieval of history, which typically will be From all categories, from day x to day y; Get all StrategyDailyLog. Questions First, does the overall layout look sound? I'm worried to see that there are so many relationships in all directions, connecting everything. Is this normal, or does it look like trouble? StrategyItem is made to represent an m:m relationship. Is it correct as I noted 1:m / 1:1 (marked red) ? StrategyItemTimeLog and ItemTimeLog; Logs values that both need to be retrieved together, when retreiving a StrategyItem. Reason I separated is that the first one is strategy-specific, and several strategies can reference same item. So I thought not to duplicate those values that are not dependent no strategy, but only on the item. Hence I also dragged out the LogTime, as it seems to be the only parameter to unite the logs. But this all looks quite disturbing with those 3 tables. Does it make sense at all? Or you have suggestion? Pink circles shows my vague attempt of Aggregate Root Paths. I've been thinking in terms of "what entity is responsible for delete". Though I'm unsure about the actual root. I think it's Category. Does it make sense related to User Requests described above?

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  • How to best propagate changes upwards a hierarchical structure for binding?

    - by H.B.
    If i have a folder-like structure that uses the composite design pattern and i bind the root folder to a TreeView. It would be quite useful if i can display certain properties that are being accumulated from the folder's contents. The question is, how do i best inform the folder that changes occurred in a child-element so that the accumulative properties get updated? The context in which i need this is a small RSS-FeedReader i am trying to make. This are the most important objects and aspects of my model: Composite interface: public interface IFeedComposite : INotifyPropertyChanged { string Title { get; set; } int UnreadFeedItemsCount { get; } ObservableCollection<FeedItem> FeedItems { get; } } FeedComposite (aka Folder) public class FeedComposite : BindableObject, IFeedComposite { private string title = ""; public string Title { get { return title; } set { title = value; NotifyPropertyChanged("Title"); } } private ObservableCollection<IFeedComposite> children = new ObservableCollection<IFeedComposite>(); public ObservableCollection<IFeedComposite> Children { get { return children; } set { children.Clear(); foreach (IFeedComposite item in value) { children.Add(item); } NotifyPropertyChanged("Children"); } } public FeedComposite() { } public FeedComposite(string title) { Title = title; } public ObservableCollection<FeedItem> FeedItems { get { ObservableCollection<FeedItem> feedItems = new ObservableCollection<FeedItem>(); foreach (IFeedComposite child in Children) { foreach (FeedItem item in child.FeedItems) { feedItems.Add(item); } } return feedItems; } } public int UnreadFeedItemsCount { get { return (from i in FeedItems where i.IsUnread select i).Count(); } } Feed: public class Feed : BindableObject, IFeedComposite { private string url = ""; public string Url { get { return url; } set { url = value; NotifyPropertyChanged("Url"); } } ... private ObservableCollection<FeedItem> feedItems = new ObservableCollection<FeedItem>(); public ObservableCollection<FeedItem> FeedItems { get { return feedItems; } set { feedItems.Clear(); foreach (FeedItem item in value) { AddFeedItem(item); } NotifyPropertyChanged("Items"); } } public int UnreadFeedItemsCount { get { return (from i in FeedItems where i.IsUnread select i).Count(); } } public Feed() { } public Feed(string url) { Url = url; } Ok, so here's the thing, if i bind a TextBlock.Text to the UnreadFeedItemsCount there won't be simple notifications when an item is marked unread, so one of my approaches has been to handle the PropertyChanged event of every FeedItem and if the IsUnread-Property is changed i have my Feed make a notification that the property UnreadFeedItemsCount has been changed. With this approach i also need to handle all PropertyChanged events of all Feeds and FeedComposites in Children of FeedComposite, from the sound of it, it should be obvious that this is not such a very good idea, you need to be very careful that items never get added or removed to any collection without having attached the PropertyChanged event handler first and things like that. Also: What do i do with the CollectionChanged-Events which necessarily also cause a change in the sum of the unread items count? Sounds like more event handling fun. It is such a mess, it would be great if anyone has an elegant solution to this since i don't want the feed-reader to end up as awful as my first attempt years ago when i didn't even know about DataBinding...

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  • Defend PHP; convince me it isn't horrible

    - by Jason L
    I made a tongue-in-cheek comment in another question thread calling PHP a terrible language and it got down-voted like crazy. Apparently there are lots of people here who love PHP. So I'm genuinely curious. What am I missing? What makes PHP a good language? Here are my reasons for disliking it: PHP has inconsistent naming of built-in and library functions. Predictable naming patterns are important in any design. PHP has inconsistent parameter ordering of built-in functions, eg array_map vs. array_filter which is annoying in the simple cases and raises all sorts of unexpected behaviour or worse. The PHP developers constantly deprecate built-in functions and lower-level functionality. A good example is when they deprecated pass-by-reference for functions. This created a nightmare for anyone doing, say, function callbacks. A lack of consideration in redesign. The above deprecation eliminated the ability to, in many cases, provide default keyword values for functions. They fixed this in PHP 5, but they deprecated the pass-by-reference in PHP 4! Poor execution of name spaces (formerly no name spaces at all). Now that name spaces exist, what do we use as the dereference character? Backslash! The character used universally for escaping, even in PHP! Overly-broad implicit type conversion leads to bugs. I have no problem with implicit conversions of, say, float to integer or back again. But PHP (last I checked) will happily attempt to magically convert an array to an integer. Poor recursion performance. Recursion is a fundamentally important tool for writing in any language; it can make complex algorithms far simpler. Poor support is inexcusable. Functions are case insensitive. I have no idea what they were thinking on this one. A programming language is a way to specify behavior to both a computer and a reader of the code without ambiguity. Case insensitivity introduces much ambiguity. PHP encourages (practically requires) a coupling of processing with presentation. Yes, you can write PHP that doesn't do so, but it's actually easier to write code in the incorrect (from a sound design perspective) manner. PHP performance is abysmal without caching. Does anyone sell a commercial caching product for PHP? Oh, look, the designers of PHP do. Worst of all, PHP convinces people that designing web applications is easy. And it does indeed make much of the effort involved much easier. But the fact is, designing a web application that is both secure and efficient is a very difficult task. By convincing so many to take up programming, PHP has taught an entire subgroup of programmers bad habits and bad design. It's given them access to capabilities that they lack the understanding to use safely. This has led to PHP's reputation as being insecure. (However, I will readily admit that PHP is no more or less secure than any other web programming language.) What is it that I'm missing about PHP? I'm seeing an organically-grown, poorly-managed mess of a language that's spawning poor programmers. So convince me otherwise!

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  • AsyncTask, inner classes and Buttons states

    - by Intern John Smith
    For a musical application (a sequencer), I have a few buttons static ArrayList<Button> Buttonlist = new ArrayList<Button>(); Buttonlist.add(0,(Button) findViewById(R.id.case_kick1)); Buttonlist.add(1,(Button) findViewById(R.id.case_kick2)); Buttonlist.add(2,(Button) findViewById(R.id.case_kick3)); Buttonlist.add(3,(Button) findViewById(R.id.case_kick4)); Buttonlist.add(4,(Button) findViewById(R.id.case_kick5)); Buttonlist.add(5,(Button) findViewById(R.id.case_kick6)); Buttonlist.add(6,(Button) findViewById(R.id.case_kick7)); Buttonlist.add(7,(Button) findViewById(R.id.case_kick8)); that I activate through onClickListeners with for example Buttonlist.get(0).setActivated(true); I played the activated sound via a loop and ifs : if (Buttonlist.get(k).isActivated()) {mSoundManager.playSound(1); Thread.sleep(250);} The app played fine but I couldn't access the play/pause button when it was playing : I searched and found out about AsyncTasks. I have a nested class PlayPause : class PlayPause extends AsyncTask<ArrayList<Button>,Integer,Void> in which I have this : protected Void doInBackground(ArrayList<Button>... params) { for(int k=0;k<8;k++) { boolean isPlayed = false; if (Buttonlist.get(k).isActivated()) { mSoundManager.playSound(1); isPlayed = true; try {Thread.sleep(250); } catch (InterruptedException e) {e.printStackTrace();}} if(!isPlayed){ try {Thread.sleep(250);} catch (InterruptedException e) {e.printStackTrace();} } } return null; } I launch it via Play.setOnClickListener(new PlayClickListener()); with PlayClickListener : public class PlayClickListener implements OnClickListener { private Tutorial acti; public PlayClickListener(){ super(); } @SuppressWarnings("unchecked") public void onClick(View v) { if(Tutorial.play==0){ Tutorial.play=1; Tutorial.Play.setBackgroundResource(R.drawable.action_down); acti = new Tutorial(); Tutorial.PlayPause myPlayPause = acti.new PlayPause(); myLecture.execute(Tutorial.Buttonlist); } else { Tutorial.play=0; Tutorial.lecture.cancel(true); Tutorial.Play.setBackgroundResource(R.drawable.action); } } } But it doesn't work. when I click on buttons and I touch Play/Pause, I have this : 07-02 11:06:01.350: E/AndroidRuntime(7883): FATAL EXCEPTION: AsyncTask #1 07-02 11:06:01.350: E/AndroidRuntime(7883): Caused by: java.lang.NullPointerException 07-02 11:06:01.350: E/AndroidRuntime(7883): at com.Tutorial.Tutorial$PlayPause.doInBackground(Tutorial.java:603) 07-02 11:06:01.350: E/AndroidRuntime(7883): at com.Tutorial.Tutorial$PlayPause.doInBackground(Tutorial.java:1) And I don't know how to get rid of this error. Obviously, the Asynctask doesn't find the Buttonlist activated status, even if the list is static. I don't know how to access these buttons' states, isPressed doesn't work either. Thanks for reading and helping me !

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  • a friendly elaboratation on how iceweasel misses as recent request was discovered in post tut

    - by v3x3n
    I would like to specify what you asked about in how iceweasel misses on in hopes that you are interested in considering the answer to be valid considering the package should run efficient to a novice user especially when getting a first impression on a new software, browser, or package they are given by default. First let me say that I am very grateful for all debian has and continues to do for its user base and I am not complaining, only hoping that in mentioning such it will eventually aid in improving the disappointing experience iceweasel gave me in multiple ways right from the start of using it. I am sure tremendous amounts of hard work went into making it work as well as it does, and tremendous effort continues to go into IW like the rest of the package and distros such as this... Having said that, I do aim to keep my examples simple as possible but also explained in enough detail as to not leave out important info to get a full idea of my issue... (Thanks for understanding if I sound novice to debian, I am but continue to learn and advance by trial and error each day, and of course the wonderful help from all the great minds available here and there)... Well, my bone to pick (unfortunately as I disdain being a complainer when so much has been done for us, the end user) with IW is mainly 3 immediately noticed problems in offering me a smooth test drive (completely normal browsing conduct of your average user, I should indicate) as soon as I started out a task using IW (heading directly to google images and searched for a few web sized images, then saved a few (no more than 800 to 900 in dimensions, typically a normal procedure I would imagine) I experienced a horrendous reoccurring freeze and lag time that almost left me to kill the process more than once on each attempt and continued to compound so that by a few attempts later, even 1 single image save locked up the entire browser, ultimately giving up on my procedure in its simplicity with a bit of aggravation, if there was something I had done wrong on my end pre-attempt or during installation. Secondly, visiting video player sites in this case youtube will not allow for any video feed to play whatsoever and again, experienced a slight freezing that eventually dissipated as long as I didn't attempt to press play or reload another video trial... Very annoying and possibly related to my first issue (which could rely on my own lack of knowledge in setup config, but that troubles me if so).... Lastly as another user has stated already, in which brought you to ask them what exactly seemed to be the problem in the first place is also my final straw that broke the weasel's back, leading me here to find a solution to a updated version of firefox... being that iceweasel (an apparent build of firefox 17.x.x) leaving the user to find themselves out of luck when installing their favorite or much useful add-ons or plugins that aid their task or normal usage online.... As the other user clearly stated... there is almost zero options and barely any luck to find compatible plugins with such an outdated version still being used... I can only imagine if as a novoice or standard user to linux... and beginner to debian (which I am all for btw!) if I am discovering major conductivity issues which hinder normal user conduct right off the bat... that there is probably a bundle or more of security vulnerabilities that would unravel to me if I continued to give mr Hommey's package any further attention, or interest in continuing to use... This is a deal breaker on any account, unless all 3 of these issues stated are due to a very n00berish setting or lack thereof (which if that is the case, such was not properly stated for beginner in any place available by following installation tutorials such as LVM installers, which I felt lacked a clear understanding to someone who is trying to learn why and how, rather than, a fix to a potentially broken out of box installation... I really think that is irrelevant in any case however, as there is much step by step support regarding that kind of thing, just saying... its very challenging, along side a job to keep deadlines on, and the need to learn a better and more costomizible system, that was not as popularized when I became a dev via windows (OK OK I know thats a huge mistake and now I am way off original topic but anyway) Thanks very much for taking the time to read over this, and I hope it honestly gives you a few good and valid reasons for users wanting and seeking a way to get around iceweasel altogether... Finally, if I am missing something vital that renders all I've stated invalid or useless, please feel free to shove that elephant in the room my direction! Thanks for all you do, as I am sure it is very useful and dedicated, being you are a debian maintainer, and super user! Much love for intelligence, freedom and sharing the secrets of the web! May it remain unregulated and a good place to grow and learn for generations to come! Stay true! Take care now! -v3x (v3x @ gmx .com)

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  • Received memory warning. Level=2, Program received signal: “0”.

    - by sabby
    Hi friends I am getting images from webservice and loading these images in table view.But when i continue to scroll the program receives memory warning level1,level2 and then app exits with status 0.That happens only in device not in simulator. Here is my code which i am putting please help me out. - (void)viewDidLoad { [super viewDidLoad]; UIButton *infoButton = [[UIButton alloc] initWithFrame:CGRectMake(0, -4, 62, 30)]; [infoButton setBackgroundImage:[UIImage imageNamed: @"back.png"] forState:UIControlStateNormal]; [infoButton addTarget:self action:@selector(backButtonClicked) forControlEvents:UIControlEventTouchUpInside]; UIBarButtonItem *customBarButtomItem = [[UIBarButtonItem alloc] initWithCustomView:infoButton]; self.navigationItem.leftBarButtonItem = customBarButtomItem; [customBarButtomItem release]; [infoButton release]; UIButton *homeButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 62, 30)]; [homeButton setBackgroundImage:[UIImage imageNamed: @"home.png"] forState:UIControlStateNormal]; [homeButton.titleLabel setFont:[UIFont systemFontOfSize:11]]; //[homeButton setTitle:@"UPLOAD" forState:UIControlStateNormal]; [homeButton addTarget:self action:@selector(homeButtonClicked) forControlEvents:UIControlEventTouchUpInside]; UIBarButtonItem *rightBarButtom = [[UIBarButtonItem alloc] initWithCustomView:homeButton]; self.navigationItem.rightBarButtonItem = rightBarButtom; [rightBarButtom release]; [homeButton release]; sellerTableView=[[UITableView alloc]initWithFrame:CGRectMake(0, 0, 320, 416) style:UITableViewStylePlain]; sellerTableView.delegate=self; sellerTableView.dataSource=self; sellerTableView.backgroundColor=[UIColor clearColor]; sellerTableView.scrollEnabled=YES; //table.separatorColor=[UIColor grayColor]; //table.separatorColor=[UIColor whiteColor]; //[[table layer]setRoundingMode:NSNumberFormatterRoundDown]; [[sellerTableView layer]setBorderColor:[[UIColor darkGrayColor]CGColor]]; [[sellerTableView layer]setBorderWidth:2]; //[[productTable layer]setCornerRadius:10.3F]; [self.view addSubview:sellerTableView]; appDel = (SnapItAppAppDelegate*)[[UIApplication sharedApplication] delegate]; } -(void)viewWillAppear:(BOOL)animated { spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; spinner.center = self.view.center; [self.view addSubview:spinner]; [spinner startAnimating]; [[SnapItParsing sharedInstance]assignSender:self]; [[SnapItParsing sharedInstance]startParsingForShowProducts:appDel.userIdString]; [sellerTableView reloadData]; } -(void)showProducts:(NSMutableArray*)proArray { if (spinner) { [spinner stopAnimating]; [spinner removeFromSuperview]; [spinner release]; spinner = nil; } if ([[[proArray objectAtIndex:1]objectForKey:@"Success"]isEqualToString:@"True"]) { //[self.navigationController popViewControllerAnimated:YES]; //self.view.alpha=.12; if (productInfoArray) { [productInfoArray release]; } productInfoArray=[[NSMutableArray alloc]init]; for (int i=2; i<[proArray count]; i++) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; [productInfoArray addObject:[proArray objectAtIndex:i]]; NSLog(@"data fetch array is====> /n%@",productInfoArray); [pool release]; } } } #pragma mark (tableview methods) - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{ return 100; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { //return [resultarray count]; return [productInfoArray count]; } -(void)loadImagesInBackground:(NSNumber *)index{ NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSMutableDictionary *frame = [[productInfoArray objectAtIndex:[index intValue]] retain]; //NSLog(@"frame value ==>%@",[[frame objectForKey:@"Image"]length]); NSString *frameImagePath = [NSString stringWithFormat:@"http://apple.com/snapit/products/%@",[frame objectForKey:@"Image"]]; NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:frameImagePath]]; NSLog(@"FRAME IMAGE%d",[[frame valueForKey:@"Image" ]length]); if([[frame valueForKey:@"Image"] length] == 0){ NSString *imagePath = [[NSString alloc] initWithFormat:@"%@/%@",[[NSBundle mainBundle] resourcePath],@"no_image.png"]; UIImage *image = [UIImage imageWithContentsOfFile:imagePath]; [frame setObject:image forKey:@"friendImage"]; [imagePath release]; //[image release]; } else { //NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:frameImagePath]]; NSLog(@"image data length ==>%d",[imageData length]); if([imageData length] == 0){ NSString *imagePath = [[NSString alloc] initWithFormat:@"%@/%@",[[NSBundle mainBundle] resourcePath],@"no_image.png"]; UIImage *image = [UIImage imageWithContentsOfFile:imagePath]; [frame setObject:image forKey:@"friendImage"]; [imagePath release]; //[image release]; } else { //UIImage *image = [[UIImage alloc] initWithData:imageData]; UIImage *image = [UIImage imageWithData:imageData]; [frame setObject:image forKey:@"friendImage"]; //[image release]; } } [frame release]; frame = nil; [self performSelectorOnMainThread:@selector(reloadTable:) withObject:[NSArray arrayWithObject:[NSIndexPath indexPathForRow:[index intValue] inSection:0]] waitUntilDone:NO]; [pool release]; } -(void)reloadTable:(NSArray *)array{ NSLog(@"array ==>%@",array); [sellerTableView reloadRowsAtIndexPaths:array withRowAnimation:UITableViewRowAnimationNone]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *celltype=@"cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:celltype]; for (UIView *view in cell.contentView.subviews) { [view removeFromSuperview]; } if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"] autorelease]; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; cell.backgroundColor=[UIColor clearColor]; //cell.textLabel.text=[[resultarray objectAtIndex:indexPath.row] valueForKey:@"Service"]; /*UIImage *indicatorImage = [UIImage imageNamed:@"indicator.png"]; cell.accessoryView = [[[UIImageView alloc] initWithImage:indicatorImage] autorelease];*/ /*NSThread *thread=[[NSThread alloc]initWithTarget:self selector:@selector() object:nil]; [thread setStackSize:44]; [thread start];*/ cell.backgroundView=[[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"cell.png"]]autorelease]; // [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"back.png"]] autorelease]; cell.selectionStyle=UITableViewCellSelectionStyleNone; } UIImageView *imageView= [[UIImageView alloc] initWithFrame:CGRectMake(19, 15, 75, 68)]; imageView.contentMode = UIViewContentModeScaleToFill; // @synchronized(self) //{ NSMutableDictionary *dict = [productInfoArray objectAtIndex:indexPath.row]; if([dict objectForKey:@"friendImage"] == nil){ imageView.backgroundColor = [UIColor clearColor]; if ([dict objectForKey:@"isThreadLaunched"] == nil) { [NSThread detachNewThreadSelector:@selector(loadImagesInBackground:) toTarget:self withObject:[NSNumber numberWithInt:indexPath.row]]; [dict setObject:@"Yes" forKey:@"isThreadLaunched"]; } }else { imageView.image =[dict objectForKey:@"friendImage"]; } //NSString *imagePath = [[NSString alloc] initWithFormat:@"%@/%@",[[NSBundle mainBundle] resourcePath],@"no_image.png"]; //imageView.layer.cornerRadius = 20.0;//vk //imageView.image=[UIImage imageWithContentsOfFile:imagePath]; //imageView.layer.masksToBounds = YES; //imageView.layer.borderColor = [UIColor darkGrayColor].CGColor; //imageView.layer.borderWidth = 1.0;//vk //imageView.layer.cornerRadius=7.2f; [cell.contentView addSubview:imageView]; //[imagePath release]; [imageView release]; imageView = nil; //} UILabel *productCodeLabel = [[UILabel alloc] initWithFrame:CGRectMake(105, 7, 60,20 )]; productCodeLabel.textColor = [UIColor whiteColor]; productCodeLabel.backgroundColor=[UIColor clearColor]; productCodeLabel.text=[NSString stringWithFormat:@"%@",@"Code"]; [cell.contentView addSubview:productCodeLabel]; [productCodeLabel release]; UILabel *CodeValueLabel = [[UILabel alloc] initWithFrame:CGRectMake(170, 7, 140,20 )]; CodeValueLabel.textColor = [UIColor whiteColor]; CodeValueLabel.backgroundColor=[UIColor clearColor]; CodeValueLabel.text=[NSString stringWithFormat:@"%@",[[productInfoArray objectAtIndex:indexPath.row]valueForKey:@"ID"]]; [cell.contentView addSubview:CodeValueLabel]; [CodeValueLabel release]; UILabel *productNameLabel = [[UILabel alloc] initWithFrame:CGRectMake(105, 35, 60,20 )]; productNameLabel.textColor = [UIColor whiteColor]; productNameLabel.backgroundColor=[UIColor clearColor]; productNameLabel.text=[NSString stringWithFormat:@"%@",@"Name"]; [cell.contentView addSubview:productNameLabel]; [productNameLabel release]; UILabel *NameValueLabel = [[UILabel alloc] initWithFrame:CGRectMake(170, 35, 140,20 )]; NameValueLabel.textColor = [UIColor whiteColor]; NameValueLabel.backgroundColor=[UIColor clearColor]; NameValueLabel.text=[NSString stringWithFormat:@"%@",[[productInfoArray objectAtIndex:indexPath.row]valueForKey:@"Title"]]; [cell.contentView addSubview:NameValueLabel]; [NameValueLabel release]; UILabel *dateLabel = [[UILabel alloc] initWithFrame:CGRectMake(105, 68, 60,20 )]; dateLabel.textColor = [UIColor whiteColor]; dateLabel.backgroundColor=[UIColor clearColor]; dateLabel.text=[NSString stringWithFormat:@"%@",@"Date"]; [cell.contentView addSubview:dateLabel]; [dateLabel release]; UILabel *dateValueLabel = [[UILabel alloc] initWithFrame:CGRectMake(170, 68, 140,20 )]; dateValueLabel.textColor = [UIColor whiteColor]; dateValueLabel.backgroundColor=[UIColor clearColor]; dateValueLabel.text=[NSString stringWithFormat:@"%@",[[productInfoArray objectAtIndex:indexPath.row]valueForKey:@"PostedDate"]]; dateValueLabel.font=[UIFont systemFontOfSize:14]; dateValueLabel.numberOfLines=3; dateValueLabel.adjustsFontSizeToFitWidth=YES; [dateValueLabel setLineBreakMode:UILineBreakModeCharacterWrap]; [cell.contentView addSubview:dateValueLabel]; [dateValueLabel release]; } Please-2 help me out ,where i am doing mistake.....

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  • Referencing variables in a structure / C++

    - by user1628622
    Below, I provided a minimal example of code I created. I managed to get this code working, but I'm not sure if the practice being employed is sound. In essence, what I am trying to do is have the 'Parameter' class reference select elements in the 'States' class, so variables in States can be changed via Parameters. Questions I have: is the approach taken OK? If not, is there a better way to achieve what I am aiming for? Example code: struct VAR_TYPE{ public: bool is_fixed; // If is_fixed = true, then variable is a parameter double value; // Numerical value std::string name; // Description of variable (to identify it by name) }; struct NODE{ public: VAR_TYPE X, Y, Z; /* VAR_TYPE is a structure of primitive types */ }; class States{ private: std::vector <NODE_ptr> node; // shared ptr to struct NODE std::vector <PROP_DICTIONARY_ptr> property; // CAN NOT be part of Parameter std::vector <ELEMENT_ptr> element; // CAN NOT be part of Parameter public: /* ect */ void set_X_reference ( Parameter &T , int i ) { T.push_var( &node[i]->X ); } void set_Y_reference ( Parameter &T , int i ) { T.push_var( &node[i]->Y ); } void set_Z_reference ( Parameter &T , int i ) { T.push_var( &node[i]->Z ); } bool get_node_bool_X( int i ) { return node[i]->X.is_fixed; } // repeat for Y and Z }; class Parameter{ private: std::vector <VAR_TYPE*> var; public: /* ect */ }; int main(){ States S; Parameter P; /* Here I initialize and set S, and do other stuff */ // Now I assign components in States to Parameters for(int n=0 ; n<S.size_of_nodes() ; n++ ){ if ( S.get_node_bool_X(n)==true ){ S.set_X_reference ( P , n ); }; // repeat if statement for Y and Z }; /* Now P points selected to data in S, and I can * modify the contents of S through P */ return 0; }; Update The reason this issue cropped up is I am working with Fortran legacy code. To sum up this Fotran code - it's a numerical simulation of a flight vehicle. This code has a fairly rigid procedural framework one must work within, which comes with a pre-defined list of allowable Fortran types. The Fortran glue code can create an instance of a C++ object (in actuality, a reference from the perspective of Fortran), but is not aware what is contained in it (other means are used to extract C++ data into Fortran). The problem that I encountered is when a C++ module is dynamically linked to the Fortran glue code, C++ objects have to be initialized each instance the C++ code is called. This happens by virtue of how the Fortran template is defined. To avoid this cycle of re-initializing objects, I plan to use 'State' as a container class. The Fortran code allows a 'State' object, which has an arbitrary definition; but I plan to use it to harness all relevant information about the model. The idea is to use the Parameters class (which is exposed and updated by the Fortran code) to update variables in States.

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  • Opening Skype, Opera, OpenOffice logs me off

    - by anjanesh
    Whats common among Skype, Opera, OpenOffice in Ubuntu ? Whenever I open these applications I get logged off and shows back me the login screen. This started happening since the 10.10 upgrade. Forgot to mention : Yes, its x64.Each time I open these applications, the UI shows and then crashes. I started each app & logged the last few lines of /var/log/syslog after each crash. Looks like something to do with sound drivers ? Opera :Jan 8 09:33:20 al-ubuntu pulseaudio[11532]: pid.c: Daemon already running. Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: snd_pcm_avail_delay() returned strange values: delay 0 is less than avail 8. Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA developers. Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: snd_pcm_dump(): Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: Soft volume PCM Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: Control: PCM Playback Volume Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: min_dB: -51 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: max_dB: 0 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: resolution: 256 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: Its setup is: Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: stream : CAPTURE Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: access : MMAP_INTERLEAVED Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: format : S16_LE Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: subformat : STD Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: channels : 2 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: rate : 44100 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: exact rate : 44100 (44100/1) Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: msbits : 16 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: buffer_size : 88192 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: period_size : 44096 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: period_time : 999909 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: tstamp_mode : ENABLE Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: period_step : 1 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: avail_min : 87310 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: period_event : 0 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: start_threshold : -1 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: stop_threshold : 6205960286516543488 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: silence_threshold: 0 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: silence_size : 0 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: boundary : 6205960286516543488 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: Slave: Hardware PCM card 0 'HDA Intel' device 0 subdevice 0 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: Its setup is: Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: stream : CAPTURE Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: access : MMAP_INTERLEAVED Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: format : S16_LE Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: subformat : STD Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: channels : 2 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: rate : 44100 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: exact rate : 44100 (44100/1) Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: msbits : 16 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: buffer_size : 88192 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: period_size : 44096 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: period_time : 999909 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: tstamp_mode : ENABLE Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: period_step : 1 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: avail_min : 87310 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: period_event : 0 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: start_threshold : -1 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: stop_threshold : 6205960286516543488 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: silence_threshold: 0 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: silence_size : 0 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: boundary : 6205960286516543488 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: appl_ptr : 87320 Jan 8 09:33:21 al-ubuntu pulseaudio[11429]: alsa-util.c: hw_ptr : 87320 Jan 8 09:33:22 al-ubuntu kernel: [ 4962.078306] opera[11036]: segfault at 261 ip 0000000000000261 sp 00007fffed7cd9a8 error 14 in opera[400000+122b000] anjanesh@al-ubuntu:~$ SkypeJan 8 09:40:21 al-ubuntu pulseaudio[12602]: pid.c: Daemon already running. Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: snd_pcm_avail_delay() returned strange values: delay 0 is less than avail 8. Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA developers. Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: snd_pcm_dump(): Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: Soft volume PCM Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: Control: PCM Playback Volume Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: min_dB: -51 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: max_dB: 0 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: resolution: 256 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: Its setup is: Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: stream : CAPTURE Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: access : MMAP_INTERLEAVED Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: format : S16_LE Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: subformat : STD Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: channels : 2 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: rate : 44100 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: exact rate : 44100 (44100/1) Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: msbits : 16 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: buffer_size : 88192 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: period_size : 44096 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: period_time : 999909 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: tstamp_mode : ENABLE Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: period_step : 1 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: avail_min : 87310 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: period_event : 0 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: start_threshold : -1 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: stop_threshold : 6205960286516543488 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: silence_threshold: 0 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: silence_size : 0 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: boundary : 6205960286516543488 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: Slave: Hardware PCM card 0 'HDA Intel' device 0 subdevice 0 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: Its setup is: Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: stream : CAPTURE Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: access : MMAP_INTERLEAVED Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: format : S16_LE Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: subformat : STD Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: channels : 2 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: rate : 44100 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: exact rate : 44100 (44100/1) Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: msbits : 16 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: buffer_size : 88192 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: period_size : 44096 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: period_time : 999909 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: tstamp_mode : ENABLE Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: period_step : 1 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: avail_min : 87310 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: period_event : 0 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: start_threshold : -1 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: stop_threshold : 6205960286516543488 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: silence_threshold: 0 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: silence_size : 0 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: boundary : 6205960286516543488 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: appl_ptr : 87312 Jan 8 09:40:23 al-ubuntu pulseaudio[12485]: alsa-util.c: hw_ptr : 87312 anjanesh@al-ubuntu:~$ Open OfficeJan 8 09:43:46 al-ubuntu pulseaudio[13157]: pid.c: Daemon already running. Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: snd_pcm_avail_delay() returned strange values: delay 0 is less than avail 16. Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA developers. Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: snd_pcm_dump(): Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: Soft volume PCM Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: Control: PCM Playback Volume Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: min_dB: -51 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: max_dB: 0 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: resolution: 256 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: Its setup is: Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: stream : CAPTURE Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: access : MMAP_INTERLEAVED Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: format : S16_LE Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: subformat : STD Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: channels : 2 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: rate : 44100 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: exact rate : 44100 (44100/1) Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: msbits : 16 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: buffer_size : 88192 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: period_size : 44096 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: period_time : 999909 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: tstamp_mode : ENABLE Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: period_step : 1 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: avail_min : 87310 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: period_event : 0 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: start_threshold : -1 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: stop_threshold : 6205960286516543488 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: silence_threshold: 0 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: silence_size : 0 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: boundary : 6205960286516543488 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: Slave: Hardware PCM card 0 'HDA Intel' device 0 subdevice 0 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: Its setup is: Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: stream : CAPTURE Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: access : MMAP_INTERLEAVED Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: format : S16_LE Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: subformat : STD Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: channels : 2 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: rate : 44100 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: exact rate : 44100 (44100/1) Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: msbits : 16 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: buffer_size : 88192 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: period_size : 44096 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: period_time : 999909 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: tstamp_mode : ENABLE Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: period_step : 1 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: avail_min : 87310 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: period_event : 0 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: start_threshold : -1 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: stop_threshold : 6205960286516543488 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: silence_threshold: 0 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: silence_size : 0 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: boundary : 6205960286516543488 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: appl_ptr : 87320 Jan 8 09:43:48 al-ubuntu pulseaudio[13064]: alsa-util.c: hw_ptr : 87320 anjanesh@al-ubuntu:~$

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