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• Has Microsoft stopped offering the free Internet Explorer Application Compatibility VPC Image for IE 6 testing?

  - by Paul D. Waite

  For some time now, Microsoft has made available free, stripped-down, time-limited Virtual PC images for testing web apps in older versions of IE. The most recent version is here: http://www.microsoft.com/download/en/details.aspx?id=11575 But the XP VPC image has now expired (14th Aug 2011), meaning one can no longer test IE 6 using this method. Have Microsoft made updated XP VPC images available? If not, have they commented on the situation? Do they provide any alternative method to test web apps in IE 6? Update As noted by @PleaseStand, as of 16th Aug 2011, Microsoft has made updated images available that expire on 17th November 2011.

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• Windows 8 client virtualization

  - by John Paul Cook

  Hyper-V is coming to Windows 8, but you must have a processor that supports SLAT. Virtual machines created with Virtual PC aren’t easily transferred to Windows 2008 Hyper-V and vice-versa. With Windows 8, it will be easy to move vhds from Windows 8 on your laptop or desktop to Windows 8 server and back again. To find out if your processor supports SLAT, run coreinfo –v from a command window running as administrator. Download coreinfo from here . My MacBook Pro supports SLAT as this output shows:...(read more)

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• Issue with a point coordinates, which creates an unwanted triangle

  - by Paul

  I would like to connect the points from the red path, to the y-axis in blue. I figured out that the problem with my triangles came from the first point (V0) : it is not located where it should be. In the console, it says its location is at 0,0, but in the emulator, it is not. The code : for(int i = 1; i < 2; i++) { CCLOG(@"_polyVertices[i-1].x : %f, _polyVertices[i-1].y : %f", _polyVertices[i-1].x, _polyVertices[i-1].y); CCLOG(@"_polyVertices[i].x : %f, _polyVertices[i].y : %f", _polyVertices[i].x, _polyVertices[i].y); ccDrawLine(_polyVertices[i-1], _polyVertices[i]); } The output : _polyVertices[i-1].x : 0.000000, _polyVertices[i-1].y : 0.000000 _polyVertices[i].x : 50.000000, _polyVertices[i].y : 0.000000 And the result : (the layer goes up, i could not take the screenshot before the layer started to go up, but the first red point starts at y=0) : Then it creates an unwanted triangle when the code continues : Would you have any idea about this? (So to force the first blue point to start at 0,0, and not at 50,0 as it seems to be now) Here is the code : - (void)generatePath{ float x = 50; //first red point float y = 0; for(int i = 0; i < kMaxKeyPoints+1; i++) { if (i<3){ _hillKeyPoints[i] = CGPointMake(x, y); x = 150 + (random() % (int) 30); y += -40; } else if(i<20){ //going right _hillKeyPoints[i] = CGPointMake(x, y); x += (random() % (int) 30); y += -40; } else if(i<25){ //stabilize _hillKeyPoints[i] = CGPointMake(x, y); x = 150 + (random() % (int) 30); y += -40; } else if(i<30){ //going left _hillKeyPoints[i] = CGPointMake(x, y); //x -= (random() % (int) 10); x = 150 + (random() % (int) 30); y += -40; } else { //back to normal _hillKeyPoints[i] = CGPointMake(x, y); x = 150 + (random() % (int) 30); y += -40; } } } -(void)generatePolygons{ static int prevFromKeyPointI = -1; static int prevToKeyPointI = -1; // key points interval for drawing while (_hillKeyPoints[_fromKeyPointI].y > -_offsetY+winSizeTop) { _fromKeyPointI++; } while (_hillKeyPoints[_toKeyPointI].y > -_offsetY-winSizeBottom) { _toKeyPointI++; } if (prevFromKeyPointI != _fromKeyPointI || prevToKeyPointI != _toKeyPointI) { _nPolyVertices = 0; float x1 = 0; int keyPoints = _fromKeyPointI; for (int i=_fromKeyPointI; i<_toKeyPointI; i++){ //V0: at (0,0) _polyVertices[_nPolyVertices] = CGPointMake(x1, y1); //first blue point _polyTexCoords[_nPolyVertices++] = CGPointMake(x1, y1); //V1: to the first "point" _polyVertices[_nPolyVertices] = CGPointMake(_hillKeyPoints[keyPoints].x, _hillKeyPoints[keyPoints].y); _polyTexCoords[_nPolyVertices++] = CGPointMake(_hillKeyPoints[keyPoints].x, _hillKeyPoints[keyPoints].y); keyPoints++; //from point at index 0 to 1 //V2, same y as point n°2: _polyVertices[_nPolyVertices] = CGPointMake(0, _hillKeyPoints[keyPoints].y); _polyTexCoords[_nPolyVertices++] = CGPointMake(0, _hillKeyPoints[keyPoints].y); //V1 again _polyVertices[_nPolyVertices] = _polyVertices[_nPolyVertices-2]; _polyTexCoords[_nPolyVertices++] = _polyVertices[_nPolyVertices-2]; //V2 again _polyVertices[_nPolyVertices] = _polyVertices[_nPolyVertices-2]; _polyTexCoords[_nPolyVertices++] = _polyVertices[_nPolyVertices-2]; //CCLOG(@"_nPolyVertices V2 again : %i", _nPolyVertices); //V3 = same x,y as point at index 1 _polyVertices[_nPolyVertices] = CGPointMake(_hillKeyPoints[keyPoints].x, _hillKeyPoints[keyPoints].y); _polyTexCoords[_nPolyVertices] = CGPointMake(_hillKeyPoints[keyPoints].x, _hillKeyPoints[keyPoints].y); y1 = _polyVertices[_nPolyVertices].y; _nPolyVertices++; } prevFromKeyPointI = _fromKeyPointI; prevToKeyPointI = _toKeyPointI; } } - (void) draw { //RED glColor4f(1, 1, 1, 1); for(int i = MAX(_fromKeyPointI, 1); i <= _toKeyPointI; ++i) { glColor4f(1.0, 0, 0, 1.0); ccDrawLine(_hillKeyPoints[i-1], _hillKeyPoints[i]); } //BLUE glColor4f(0, 0, 1, 1); for(int i = 1; i < 2; i++) { CCLOG(@"_polyVertices[i-1].x : %f, _polyVertices[i-1].y : %f", _polyVertices[i-1].x, _polyVertices[i-1].y); CCLOG(@"_polyVertices[i].x : %f, _polyVertices[i].y : %f", _polyVertices[i].x, _polyVertices[i].y); ccDrawLine(_polyVertices[i-1], _polyVertices[i]); } } Thanks

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• What is the best way to promote a programming blog?

  - by paul

  (The guys from 'Programmers' referred me here...) How do you promote your programming blog? I recently started http://blackforestcoder.blogspot.com/ to record my progress working with new technologies and ideas. The main aim being to provide a list of pitfalls and solutions and also to get feedback from readers. Since I set it up 10 days ago I have only had about 2-3 hits even though Google is supposed to be indexing it. How might I boost the hit rate?

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• Printing PowerPoint slides in black and white

  - by John Paul Cook

  When I do SQL Server training, sometimes students want to print all of the PowerPoint slides and use them for note taking during class. For such purposes, the background is usually better off being suppressed. This is most efficiently done by changing Print Settings as shown below: Personally I recommend that people take notes directly in the slides instead of printing them. PowerPoint has a notes area. If you do want to print slides and notes, once again use the Print Settings to specify this:...(read more)

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• How to Create Effective Error Reports

  - by John Paul Cook

  This post demonstrates some generic problem reporting steps that I encourage all users, whether developers or nontechnical end users, to follow. SQL Server has a feature that can help. So does Windows in some cases. More on those in Step 3. Step 1: Is the problem caused by a particular action undertaken on a gui? If so, you should get a screen capture. But if it is caused by executing some T-SQL code in a query window, just copy/paste the offending code as text. There are several ways to get a screen...(read more)

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• Many-to-many relationships in pharmacology

  - by John Paul Cook

  When I was in my pharmacology class this morning, I realized that the instructor was presenting a classic relational database management system problem: the many-to-many relationship. He said that all of us in nursing school must know our drugs backwards and forwards. I know how to model that! There are so many things in both healthcare and higher education that could benefit from an appropriate application of technology. As a student, I'd like to be able to start with a drug, a disease, a name of...(read more)

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• In 10.10, USB 3.0 PCI Express card recognized by lspci but not lsusb or dmesg. How to fix?

  - by Paul

  Asus N PC, runs 10.10 x86_64 The Asus N comes with 4 usb 2.0 ports, each labelled 2.0 on the case. Attempting to add two usb 3.0 ports to be provided by a generic usb 3.0 pci express card installed in the pci expres slot. The new card says usb 3.0 and has the blue ports. The card is installed into the laptop unpowered, then the laptop is powered on and boots normally. Nothing happens when a USB 3.0 flash drive is inserted into the usb 3.0 port. uname -a Linux drpaulbrewer-N90SV 2.6.35.8 #1 SMP Fri Jan 14 15:54:11 EST 2011 x86_64 GNU/Linux lspci -v 00:00.0 Host bridge: Silicon Integrated Systems [SiS] 671MX Subsystem: ASUSTeK Computer Inc. Device 1b27 Flags: bus master, medium devsel, latency 64 Kernel modules: sis-agp 00:01.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 I/O behind bridge: 0000d000-0000dfff Memory behind bridge: fa000000-fdefffff Prefetchable memory behind bridge: 00000000d0000000-00000000dfffffff Capabilities: [d0] Express Root Port (Slot+), MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [f4] Power Management version 2 Capabilities: [70] Subsystem: Silicon Integrated Systems [SiS] PCI-to-PCI bridge Kernel driver in use: pcieport 00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS968 [MuTIOL Media IO] (rev 01) Flags: bus master, medium devsel, latency 0 00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev 01) (prog-if 80 [Master]) Subsystem: ASUSTeK Computer Inc. Device 1b27 Flags: bus master, medium devsel, latency 128 I/O ports at 01f0 [size=8] I/O ports at 03f4 [size=1] I/O ports at 0170 [size=8] I/O ports at 0374 [size=1] I/O ports at ffe0 [size=16] Capabilities: [58] Power Management version 2 Kernel driver in use: pata_sis 00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f) (prog-if 10 [OHCI]) Subsystem: ASUSTeK Computer Inc. Device 1b27 Flags: bus master, medium devsel, latency 64, IRQ 20 Memory at f9fff000 (32-bit, non-prefetchable) [size=4K] Kernel driver in use: ohci_hcd 00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f) (prog-if 10 [OHCI]) Subsystem: ASUSTeK Computer Inc. Device 1b27 Flags: bus master, medium devsel, latency 64, IRQ 21 Memory at f9ffe000 (32-bit, non-prefetchable) [size=4K] Kernel driver in use: ohci_hcd 00:03.3 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller (prog-if 20 [EHCI]) Subsystem: ASUSTeK Computer Inc. Device 1b27 Flags: bus master, medium devsel, latency 64, IRQ 22 Memory at f9ffd000 (32-bit, non-prefetchable) [size=4K] Capabilities: [50] Power Management version 2 Kernel driver in use: ehci_hcd 00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] 191 Gigabit Ethernet Adapter (rev 02) Subsystem: ASUSTeK Computer Inc. Device 11f5 Flags: bus master, medium devsel, latency 0, IRQ 19 Memory at f9ffcc00 (32-bit, non-prefetchable) [size=128] I/O ports at cc00 [size=128] Capabilities: [40] Power Management version 2 Kernel driver in use: sis190 Kernel modules: sis190 00:05.0 IDE interface: Silicon Integrated Systems [SiS] SATA Controller / IDE mode (rev 03) (prog-if 8f [Master SecP SecO PriP PriO]) Subsystem: ASUSTeK Computer Inc. Device 1b27 Flags: bus master, medium devsel, latency 64, IRQ 17 I/O ports at c800 [size=8] I/O ports at c400 [size=4] I/O ports at c000 [size=8] I/O ports at bc00 [size=4] I/O ports at b800 [size=16] I/O ports at b400 [size=128] Capabilities: [58] Power Management version 2 Kernel driver in use: sata_sis Kernel modules: sata_sis 00:06.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=02, subordinate=02, sec-latency=0 Memory behind bridge: fdf00000-fdffffff Capabilities: [b0] Subsystem: Silicon Integrated Systems [SiS] Device 0004 Capabilities: [c0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [d0] Express Root Port (Slot+), MSI 00 Capabilities: [f4] Power Management version 2 Kernel driver in use: pcieport 00:07.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=03, subordinate=06, sec-latency=0 I/O behind bridge: 0000e000-0000efff Memory behind bridge: fe000000-febfffff Prefetchable memory behind bridge: 00000000f6000000-00000000f8ffffff Capabilities: [b0] Subsystem: Silicon Integrated Systems [SiS] Device 0004 Capabilities: [c0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [d0] Express Root Port (Slot+), MSI 00 Capabilities: [f4] Power Management version 2 Kernel driver in use: pcieport 00:0f.0 Audio device: Silicon Integrated Systems [SiS] Azalia Audio Controller Subsystem: ASUSTeK Computer Inc. Device 17b3 Flags: bus master, medium devsel, latency 0, IRQ 18 Memory at f9ff4000 (32-bit, non-prefetchable) [size=16K] Capabilities: [50] Power Management version 2 Kernel driver in use: HDA Intel Kernel modules: snd-hda-intel 01:00.0 VGA compatible controller: nVidia Corporation G96 [GeForce GT 130M] (rev a1) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device 2021 Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at fc000000 (32-bit, non-prefetchable) [size=16M] Memory at d0000000 (64-bit, prefetchable) [size=256M] Memory at fa000000 (64-bit, non-prefetchable) [size=32M] I/O ports at dc00 [size=128] [virtual] Expansion ROM at fde80000 [disabled] [size=512K] Capabilities: [60] Power Management version 3 Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [78] Express Endpoint, MSI 00 Capabilities: [b4] Vendor Specific Information: Len=14 <?> Kernel driver in use: nvidia Kernel modules: nvidia-current, nouveau, nvidiafb 02:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01) Subsystem: Device 1a3b:1067 Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at fdff0000 (64-bit, non-prefetchable) [size=64K] Capabilities: [40] Power Management version 2 Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [60] Express Legacy Endpoint, MSI 00 Capabilities: [90] MSI-X: Enable- Count=1 Masked- Kernel driver in use: ath9k Kernel modules: ath9k 03:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 03) (prog-if 30) Flags: bus master, fast devsel, latency 0, IRQ 10 Memory at febfe000 (64-bit, non-prefetchable) [size=8K] Capabilities: [50] Power Management version 3 Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+ Capabilities: [90] MSI-X: Enable- Count=8 Masked- Capabilities: [a0] Express Endpoint, MSI 00 lsusb Bus 003 Device 002: ID 0b05:1751 ASUSTek Computer, Inc. BT-253 Bluetooth Adapter Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 004: ID 0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader Bus 001 Device 002: ID 04f2:b071 Chicony Electronics Co., Ltd 2.0M UVC Webcam / CNF7129 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub dmesg trying to post dmesg exceeded the stackexchange posting limit of 30K... but nothing there is usb 3.0

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• Printing PowerPoint slides in black and white

  - by John Paul Cook

  When I do SQL Server training, sometimes students want to print all of the PowerPoint slides and use them for note taking during class. For such purposes, the background is usually better off being suppressed. This is most efficiently done by changing Print Settings as shown below: Personally I recommend that people take notes directly in the slides instead of printing them. PowerPoint has a notes area. If you do want to print slides and notes, once again use the Print Settings to specify this:...(read more)

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• Reminder: Oracle Solaris 11 Beta Exam Ending Soon!

  - by Paul Sorensen

  Just a quick reminder that the beta exam for the new "Oracle Certified Associate, Oracle Solaris 11 System Administrator" certification will be ending on April 28th. I'd like to invite anyone that has held off on becoming certified to consider taking beta exam. Participating in our Oracle's certification beta exams is a very inexpensive way to get certified, and you can be one of the first few people to become certified on Oracle Solaris 11. Please note that in order to earn your Oracle Solaris 11 OCA you are not required to attend a course from Oracle (of course you pass the test).Quick Links: Beta Exam: Oracle Solaris 11 System Administration (1Z1-821) Certification Track: Oracle Certified Associate, Oracle Solaris 11 System Administrator Certification Website: About Beta Exams Register Now: Pearson VUE

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• today's multi-device world for web development

  - by paul smith

  With the huge explosion of mobile devices and addition of HTML5/CSS3, there seems to be a shift towards "responsive" designs (i.e., adapting to smaller screen sizes) which seems to be achieved using CSS3's Media Queries. My question is, given the current need of adapting to both desktop and mobile, is it common practice to actually organize two versions of your website (one for desktop and one for mobile)? Or is there just one version with different css files for targeting different devices and screens? Handling just cross-browser (ie6, ff3, opera9, etc...) HTML4/5, CSS2/3 was already hard enough, but now we're expected to handle cross-device (phone, tablet, etc...) as well, so my assumption is company's would create a separate project for mobile and redirect based on the user agent, but this is just a guess.

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• Using Alt-select in SSMS, Word, and elsewhere

  - by John Paul Cook

  A surprising number of database people and Windows users in general don’t know about Alt select . This is a Windows technique not unique to SSMS that allows a user to select an arbitrary rectangular region of text and delete it, cut it, or copy it. Where I find Alt select particularly useful in SSMS is when I have a bunch of inline comments that are too far to the right. I want to delete much of the whitespace in front of them to move them to the left without disturbing any of the rest of the T-SQL....(read more)

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• Genetic Considerations in User Interface Design

  - by John Paul Cook

  There are several different genetic factors that are highly relevant to good user interface design. Color blindness is probably the best known. But did you know about motion sickness and epilepsy? We’ve been discussing how genetic factors should be considered in user interface design in one of my classes at Vanderbilt University School of Nursing. According to the National Library of Medicine, approximately 8% of males and 0.5% of females have red-green color discrimination problems with the most...(read more)

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• Chrome trims the last <li> element in a row [closed]

  - by Paul

  Ok guys, I give up. Here's the code I'm struggling with: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <title>Blah</title> <style type="text/css"> #container { margin: 0 auto; width: 350px; border: 1px solid #ccc; } ul { list-style-type: none; margin: 0; padding: 0; text-align: center; } ul li { display: inline; padding: 5px; margin: 0 1px; background-color: lime; line-height: 2em; /* border: 1px solid red; */ } </style> </head> <body> <div id="container"> <ul> <li>Element A</li> <li>Element B</li> <li>Element C</li> <li>Element D</li> <li>Element E</li> <li>Element F</li> </ul> </div> </body> </html> Why the heck does Chrome trim the right side of "Element D" (even though there is enough space to display whole item), while Firefox and even Internet Explorer render this code properly? It becomes more visible when we apply the commented border. In other words, is there a way to tell the browser that I want every single <li> element to be autonomic, and thus to move it to the next row if it doesn't fit entirely in the previous one? Can't wait to see the solution, thanks in advance.

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• Social media and special characters

  - by John Paul Cook

  I’ve previously blogged about using Unicode with T-SQL to put superscripts, subscripts, and special characters into text strings. Unicode is also useful in formatting social media such as Facebook, Twitter, and that dinosaur otherwise known as email. When you can’t set properties of text such as italicizing the subject line of an email message or adding subscripts to a Facebook post, Unicode can make it possible. There are Unicode characters that are intrinsically italicized. Others are intrinsically...(read more)

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• finding houses within a radius

  - by paul smith

  During an interview I was asked given the following: A real estate application that lists all houses that are currently on the market (i.e., for sale) within a given distance (say for example the user wants to find all houses within 20 miles), how would you design your application (both data structure and alogirithm) to build this type of service? Any ideas? How would you implement it? I told him I didn't know becaue I've never done any geo-related stuff before.

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• How to correctly create a virtual file system?

  - by Paul

  A task in my homework assignment asks me to create a virtual file system, mount it, and perform some operations on it. I am supposed to create a file of 10 MB whose bits are all set to 0, format it as ext3 and mount it. This is how I've done that: dd if=/dev/zero of=~/filesyst bs=10485760 count=1 sudo mkfs.ext3 ~/filesyst sudo mount –o loop ~/filesyst /media/fuse Even though I've used /dev/sero, the file i still full of gibberish characters (mostly at-signs). The permissions on /media/fuse are drw-rw-rw- (which are alright), but the permissions on the files inside it are something like this: d????????? ? ? ? ? ? lost+found -????????? ? ? ? ? ? secret_bin Where have I gone wrong?

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• Upgraded Ubuntu 12.04 -> 12.10 and Drupal 7 site now get error

  - by Paul B

  I do all my Drupal 7 webdev and today I took advantage to upgrade my local WebDev box O/S to Ubuntu 12.10 from 12.04 and now I get the following errors for all my D7 projects on my localhost WebDev box (Ubuntu 12.10) It was all fine pre Ubuntu 12.04: Error The website encountered an unexpected error. Please try again later. Error message PDOException: SQLSTATE[42000]: Syntax error or access violation: 1286 Unknown storage engine 'InnoDB': SELECT expire, value FROM {semaphore} WHERE name = :name; Array ( [:name] => variable_init ) in lock_may_be_available() (line 167 of /var/www/jobsdaily/includes/lock.inc). A quick research and look into the phpmyadmin (3.4.11.1) and it seems InnoDB is an issue and when I click on a table to see data I get #1286 - Unknown storage engine 'InnoDB'. I have all my D7 sql backed up, but don't really want to go down the whole 'import' route, since it's 10 months work! Anyone had this issues and can anyone suggest fix ideas? Thanks

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• New free SQL Azure offer

  - by John Paul Cook

  Microsoft has a new and better way to get a free Azure account for a month. All you need to do to sign up is provide your Windows Live Id and register at http://bit.ly/CRAzurePass using promotional code DPCE01 . This is a great way to learn about SQL Azure and improve your skills. You might be interested in downloading the SQL Azure version of the AdventureWorks database from Codeplex ....(read more)

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• Windows 8 Consumer Preview and SkyDrive

  - by John Paul Cook

  SkyDrive integrates very nicely with Windows 8. More on that later. First, let’s discuss using Windows 8 x64 on VirtualBox. Since I wanted to test with x64 and didn’t have a Hyper-V server available, I used VirtualBox. The latest version of VirtualBox does list Windows 8 as a guest operating system choice. The first time I attempted the installation, I chose the experimental Direct3D graphics support. That didn’t work well. After what seemed like FOREVER looking at a completely black screen, I decided...(read more)

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• questions on a particular algorithm

  - by paul smith

  Upon searching for a fast primr algorithm, I stumbled upon this: public static boolean isP(long n) { if (n==2 || n==3) return true; if ((n&0x1)==0 || n%3==0 || n<2) return false; long root=(long)Math.sqrt(n)+1L; // we check just numbers of the form 6*k+1 and 6*k-1 for (long k=6;k<=root;k+=6) { if (n%(k-1)==0) return false; if (n%(k+1)==0) return false; } return true; } My questions are: Why is long being used everywhere instead of int? Because with a long type the argument could be much larger than Integer.MAX thus making the method more flexible? In the second 'if', is n&0x1 the same as n%2? If so why didn't the author just use n%2? To me it's more readable. The line that sets the 'root' variable, why add the 1L? What is the run-time complexity? Is it O(sqrt(n/6)) or O(sqrt(n)/6)? Or would we just say O(n)?

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• Ubuntu 11.10 overheating with Sony Vaio

  - by Paul Connolly

  I am a Windows user trying to move over to Ubuntu without much success. I have installed the 11.10 version as dual boot by using Wubi tool on the Ubuntu website and can only use the operating system for about 5 minutes before it overheats and shuts off the machine. I have done my searches and seen many posts about overheating but cannot see one that I am able to apply to my particular case. Can anyone give me a steer on this please?

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• Surface Pro 3 first impressions

  - by John Paul Cook

  I traded in my Surface 2 (the trade-in program is now over) and bought a Surface Pro 3 with an i7 processor and 8 GB of ram. I greatly prefer the 3 by 2 aspect ratio of the Surface 3. After only one day of ownership, I’ve decided to purchase a docking station. I have a 7 year old desktop with a quad core Q6600 processor overclocked to 3.0 GHz and 8 GB of ram. It has a Plextor 512 MB SSD as the primary drive. It’s a very capable machine, but it does have a little bit, and I do mean only a little bit,...(read more)

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• Ubuntu Server adding a new user

  - by Paul Edwards

  Hi i am new to Ubuntu server and i have been trying to add a new user. I typed in adduser then username and also tried useradd then username but it does seem to add a user but when i login i only get a dollar sign instead of user@servername. I have tried adding rules to allow me into the sudo for that username but i just can't work out why i only get the dollar sign. So would be really grateful if someone could help me with this Thanks....

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• Excel 2013 Data Explorer and GeoFlow make 3-D maps quick and easy

  - by John Paul Cook

  Excel add-ins Data Explorer and GeoFlow work well together, mainly because they just work. Simple, fast, and powerful. I started Excel 2013, used Data Explorer to search for, examine, and then download latitude-longitude data and finally used GeoFlow to plot an interactive 3-D visualization. I didn’t use any fancy Excel commands and the entire process took less than 3 minutes. You can download the GeoFlow preview from here . It can also be used with Office 365. Start by clicking the DATA EXPLORER...(read more)

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