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• Experience/Articles about "decision tree" documentation?

  - by Philipp Keller

  I'm running an "defect fixing" group (developers do 2 weeks operations, then rotate). I want to build up a documentation "how to deal with problem x" - basically a decision tree: Is the problem in part x of the web site? Yes: Is the problem occurring in all browsers? Yes: ... No: ... No: ... The documentation should be written and extended by the people using it. Do you know of any book/article describing how that is best done, or is there a software (Mac OS X) that helps doing that?

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• RoR Devise: Sign in with username OR email

  - by Patrick Oscity

  Whats the best way to enable users to log in with their email address OR their username? I am using warden + devise for authentication. I think it probably won't be too hard to do it but i guess i need some advice here on where to put all the stuff that is needed. Perhaps devise devise already provides this feature? like in the config/initializers/devise.rb you would write: config.authentication_keys = [ :email, :username ] To require both username AND email for signing in. But i really want to have only one field for both username and email and require only one of them. I'll just visualize that with some ASCII art, it should look something like this in the view: Username or Email: [____________________] Password: [____________________] [Sign In]

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• Strange Recurrent Excessive I/O Wait

  - by Chris

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

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• cgi.FieldStorage translating unicode strangely

  - by trydyingtolive

  I have a form that is on a UTF-8 encoded page. When I submit the form cgi.FieldStorage converts any non-ascii character to an odd format. For example if I submit the value c. The browser will send %c4%87. I want to convert that to the string \xc4\x87. However, cgi.FieldStorage is converting it to \\xc4\\x87. post = cgi.FieldStorage(fp=env['wsgi.input'], environ=env, keep_blank_values=True) Python 2.6 on Ubuntu 9.10SE, Apache2, mod_wsgi.

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• Code golf: the Mandelbrot set

  - by Stefano Borini

  Usual rules for the code golf. Here is an implementation in python as an example from PIL import Image im = Image.new("RGB", (300,300)) for i in xrange(300): print "i = ",i for j in xrange(300): x0 = float( 4.0*float(i-150)/300.0 -1.0) y0 = float( 4.0*float(j-150)/300.0 +0.0) x=0.0 y=0.0 iteration = 0 max_iteration = 1000 while (x*x + y*y <= 4.0 and iteration < max_iteration): xtemp = x*x - y*y + x0 y = 2.0*x*y+y0 x = xtemp iteration += 1 if iteration == max_iteration: value = 255 else: value = iteration*10 % 255 print value im.putpixel( (i,j), (value, value, value)) im.save("image.png", "PNG") The result should look like this Use of an image library is allowed. Alternatively, you can use ASCII art. This code does the same for i in xrange(40): line = [] for j in xrange(80): x0 = float( 4.0*float(i-20)/40.0 -1.0) y0 = float( 4.0*float(j-40)/80.0 +0.0) x=0.0 y=0.0 iteration = 0 max_iteration = 1000 while (x*x + y*y <= 4.0 and iteration < max_iteration): xtemp = x*x - y*y + x0 y = 2.0*x*y+y0 x = xtemp iteration += 1 if iteration == max_iteration: line.append(" ") else: line.append("*") print "".join(line) The result ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** **************************************** *************************************** **************************************** *************************************** **************************************** *************************************** **************************************** *************************************** **************************************** *************************************** **************************************** *************************************** **************************************** *************************************** *************************************** ************************************** ************************************* ************************************ ************************************ *********************************** *********************************** ********************************** ************************************ *********************************** ************************************* ************************************ *********************************** ********************************** ******************************** ******************************* **************************** *************************** ***************************** **************************** **************************** *************************** ************************ * * *********************** *********************** * * ********************** ******************** ******* ******* ******************* **************************** *************************** ****************************** ***************************** ***************************** * * * **************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ******************************************************************************** ********************************************************************************

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• How to Detect Forward and Back Mouse Button Events in Delphi?

  - by EagleOfToledo

  If a mouse has other buttons in addition to the standard left/right/middle (e.g. forward/back), how can we detect those button clicks in Delphi? An example of how this is used is the Internet Explorer, where the forward/back button on the side of a Logitech or MS mouse cycles forward and back between any loaded web pages. This seems to replicate the Backspace/CTRL+Backspace on the keyboard but I tried to detect that using KeyPreview and the KeyPress event but it does not pick it up. Any idea how to detect clicks on these extended mouse buttons?

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• Pipe data from InputStream to OutputStream in Java

  - by Wangnick

  Dear all, I'd like to send a file contained in a ZIP archive unzipped to an external program for further decoding and to read the result back into Java. ZipInputStream zis = new ZipInputStream(new FileInputStream(ZIPPATH)); Process decoder = new ProcessBuilder(DECODER).start(); ??? BufferedReader br = new BufferedReader(new InputStreamReader( decoder.getInputStream(),"us-ascii")); for (String line = br.readLine(); line!=null; line = br.readLine()) { ... } What do I need to put into ??? to pipe the zis content to the decoder.getOutputStream()? I guess a dedicated thread is needed, as the decoder process might block when its output is not consumed.

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• Text encoding problem between NSImage, NSData, and NSXMLDocument

  - by andyvn22

  I'm attempting to take an NSImage and convert it to a string which I can write in an XML document. My current attempt looks something like this: [xmlDocument setCharacterEncoding: @"US-ASCII"]; NSData* data = [image TIFFRepresentation]; NSString* string = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; //Put string inside of NSXMLElement, write out NSXMLDocument. Reading back in looks something like this: NSXMLDocument* newXMLDocument = [[NSXMLDocument alloc] initWithData:data options:0 error:outError]; //Here's where it fails. I get: //Error Domain=NSXMLParserErrorDomain Code=9 UserInfo=0x100195310 "Line 7: Char 0x0 out of allowed range" I assume I'm missing something basic. What's up with this encoding issue?

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• Design Layout/Patterns

  - by wpfwannabe

  I am still fairly new to C# and I am trying to decide the best way to structure a new program. Here is what I want to do and I would like feed back on my idea. Presentation Layer Business Layer (Separate Class Library) Data Layer (Separate Class Library) Model Layer (Separate Class Library) What I am struggling with is if it is ok to have the classes in the Data Layer and Business Layer inherit from the types I define in Model Layer. This way I can extended the types as needed in my Business Layer with any new properties I see fit. I might not use every property from the Model type in my Business Layer class but is that really a big deal? If this isn't clear enough I can try and put together an example.

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• Groovy: How to access objects with Id tag?

  - by skifan0

  Hello, I have the following Groovy+SwingBuilder code. In one panel I generate checkboxes and in another panel I want to access the values of the checkboxes. The code looks basically likes this: def optionsmap = [ foo : "value_foo", bar : "value_bar"] SwingBuilder.build() { frame(title:'demo1', size:[400,700], visible:true, defaultCloseOperation:WC.EXIT_ON_CLOSE) { gridLayout(rows: 1, cols: 2) panel(id:'optionPanel', constraints:java.awt.BorderLayout.CENTER) { gridLayout(rows: 5, cols: 1) myGroup = buttonGroup(); for (entry in optionsmap) { checkBox(id: entry.key, text: entry.value ) } } panel(constraints:java.awt.BorderLayout.WEST) { button ('Show values', actionPerformed: { for (entry in optionsmap) { println (entry.key as Class).text } }) } } } optionsmap is a map with (id, text) pairs that can be extended. When I press "show values" I get an error message: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'foo' with class 'java.lang.String' to class 'java.lang.Class' How could I access the checkboxes for my action in the second panel by using the checkbox ids from optionsmap? Thank you if you can help

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• What is the difference between Cloud Computing and Grid Computing ?

  - by this. __curious_geek

  Hi, Can you please help me understand the significant differences between Cloud Computing and Grid Computing ? What are the precise definations and target application domains for both ? I'm looking for conceptual insights along with technicalities. Like Windows Azure is a Cloud OS, do we have anytihng such for Grid Computing ? In past I did work on distributed and parallel computing and I used the librariries like PVM and MPI for processing distribution. Out of curiosity I wanted to know If Grid Computing is distributed computing extended over internet ?

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• exceptions with python unicode encode/decode functions (why doesn't errors=ignore actually ignore th

  - by gatoatigrado

  Does anyone know why the string conversion functions throw exceptions when errors="ignore" is passed? How can I convert from regular Python string objects to unicode without errors being thrown? Thanks very much! python -c "import codecs; codecs.open('tmp', 'wb', encoding='utf8', errors='ignore').write('?????')" returns Traceback (most recent call last): File "", line 1, in File "/usr/lib/python2.6/codecs.py", line 686, in write return self.writer.write(data) File "/usr/lib/python2.6/codecs.py", line 351, in write data, consumed = self.encode(object, self.errors) UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128)

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• Wrapping WPF UserControl inside VisualStudio Item Template

  - by karthik84

  I am currently started working on a project which will allow users to design reports inside visual studio. Previously, for my similar Winforms App, I had extended the IComponent (Component Class) and wrote our VS Like designer kind of custom control which will allow users to drag drop controls from the visual studio toolbox and then I export it as a VisualStudio C#&VB ItemTemplate. Now I am trying to recreate the same control using WPF considering its power, extensiblity. Could anyone shed some lights on this, on what would be the most preferable way of doing this ? Thanks in advance.

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• Best Design pattern for social media file transfer

  - by Onema

  Our system would like our clients to link their accounts with different social media sites like youtube, vimeo, facebook, myspace and so on. One of the benefits we would like to give to the user is to transfer, update and delete files they have uploaded to our sites and transfer them to the social media sites mentioned above. this files could be videos, images or audio. We started thinking about using a strategy pattern, as all of these sites share a common process ( authentication, connection, use the API to transfer/edit/delete the file ), but we soon realized that it may not work as me may want to use some of the extended functionality that is specific to each service (eg: associate a youtube video with a channel, or upload images to a specific album on facebook, and much, much more...) My question is, what would be the best Structural Design Patter to use for this scenario?

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• Why use I-prefix for interfaces in Java?

  - by Lars Andren

  Is there some reason why people use I-prefix for interfaces in Java? It seems to be a C#-convention spilling over. For C# it makes sense, as the answers to this question explains. However, for Java a class declaration clearly states which class that is extended and which interfaces that are implemented: public class Crow extends Animal implements Bird I think Joshua Bloch didn't suggest this in Effective Java, and I think he usually makes a lot of sense. I get the I-verbing as presented in an answer to the question above, but is there some other use with this convention for Java?

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• Change Emacs Default Coding System

  - by Saterus

  My problem stems from Emacs inserting the coding system headers into source files containing non-ascii characters: # -*- coding: utf-8 -*- My coworkers do not like these headers being checked into our repositories. I don't want them inserted into my files because Emacs automatically detects that the file should be UTF-8 regardless so there doesn't seem to be any benefit to anyone. I would like to simply set Emacs to use UTF-8 automatically for all files, yet it seems to disagree with this idea. In an effort to fix this, I've added the following to my .emacs: (prefer-coding-system 'utf-8) (setq coding-system-for-read 'utf-8) (setq coding-system-for-write 'utf-8) This does not seem to solve my problem. Emacs still inserts the coding-system headers into my files. Anyone have any ideas? EDIT: I think this problem is specifically related to ruby-mode. I still can't turn it off though.

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• Serializing chinese characters with Xerces 2.6

  - by Gianluca

  I have a Xerces (2.6) DOMNode object encoded UTF-8. I use to read its TEXT element like this: CBuffer DomNodeExtended::getText( const DOMNode* node ) const { char* p = XMLString::transcode( node->getNodeValue( ) ); CBuffer xNodeText( p ); delete p; return xNodeText; } Where CBuffer is, well, just a buffer object which is lately persisted as it is in a DB. This works until in the TEXT there are just common ASCII characters. If we have i.e. chinese ones they get lost in the transcode operation. I've googled a lot seeking for a solution. It looks like with Xerces 3, the DOMWriter class should solve the problem. With Xerces 2.6 I'm trying the XMLTranscoder, but no success yet. Could anybody help?

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• How to use unicode inside an xpath string? (UnicodeEncodeError)

  - by Gj

  I'm using xpath in Selenium RC via the Python api. I need to click an a element who's text is "Submit »" Here's the error that I'm getting: In [18]: sel.click(u"xpath=//a[text()='Submit \xbb')]") ERROR: An unexpected error occurred while tokenizing input The following traceback may be corrupted or invalid The error message is: ('EOF in multi-line statement', (1121, 0)) --------------------------------------------------------------------------- Exception Traceback (most recent call last) /Users/me/<ipython console> in <module>() /Users/me/selenium.pyc in click(self, locator) 282 'locator' is an element locator 283 """ --> 284 self.do_command("click", [locator,]) 285 286 /Users/me/selenium.pyc in do_command(self, verb, args) 213 #print "Selenium Result: " + repr(data) + "\n\n" 214 if (not data.startswith('OK')): --> 215 raise Exception, data 216 return data 217 <type 'str'>: (<type 'exceptions.UnicodeEncodeError'>, UnicodeEncodeError('ascii', u"ERROR: Invalid xpath [2]: //a[text()='Submit \xbb')]", 45, 46, 'ordinal not in range(128)'))

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• Three vertically stacked DIVs with scrolling middle

  - by Dave

  Is it possible to stack three DIVs vertically and have just the middle div scroll vertically? I don't want to use pixel heights, though, because the DIVs are inside of a dialog box that is resizeable. Something like this (pardon my lousy ASCII art): +-----------+ | Header | +-----------+ | ^| | || | Scroll || | || | v| +-----------+ | Footer | +-----------+ The goal is to have the header and and footer fixed and, as the dialog grows, the middle div would grow vertically. Maybe I'm just being stupid, but I've been fighting this for the last few hours and can't seem to get it right. The three DIVs probably need to be inside "another" DIV but when I do that, and set the height to 100%, it grows as the middle DIV grows. Again, it's probably something silly I'm not accounting for. I've also tried using a TABLE to no avail. Thanks for any help.

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• binary file to string

  - by andrew

  i'm trying to read a binary file (for example an executable) into a string, then write it back FileStream fs = new FileStream("C:\\tvin.exe", FileMode.Open); BinaryReader br = new BinaryReader(fs); byte[] bin = br.ReadBytes(Convert.ToInt32(fs.Length)); System.Text.Encoding enc = System.Text.Encoding.ASCII; string myString = enc.GetString(bin); fs.Close(); br.Close(); System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding(); byte[] rebin = encoding.GetBytes(myString); FileStream fs2 = new FileStream("C:\\tvout.exe", FileMode.Create); BinaryWriter bw = new BinaryWriter(fs2); bw.Write(rebin); fs2.Close(); bw.Close(); this does not work (the result has exactly the same size in bytes but can't run) if i do bw.Write(bin) the result is ok, but i must save it to a string

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• casting void* to float* creates only zeros

  - by Paperflyer

  I am reading an audio file using CoreAudio (Extended Audio File Read Services). The audio data gets converted to 4-byte float and handed to me as a void* buffer. It can be played with Audio Queue Services, so its content is correct. Next, I want to draw a waveform and thus need access to the actual samples. So, I cast void* audioData to float*: Float32 *floatData = (Float32 *)audioData; When accessing this data however, I only get 0.0 regardless of the index. Float32 value = floatData[index]; // Is always zero for any index Am I doing something wrong with the cast?

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• embed ttf as embeded resource can't reference it

  - by HoNgOuRu

  Hi, I've just added a ttf file to the project (c# 2008 express) as "file" and build option to embeded resource. I'm having problems when trying to set this font like this: (I know the next line is wrong...) this.label1.Font = AlarmWatch.Properties.Resources.Baby_Universe; Error 1 Cannot implicitly convert type 'byte[]' to 'System.Drawing.Font' C:\Users\hongo\Documents\Visual Studio 2008\Projects\AlarmWatch\AlarmWatch\Form1.Designer.cs 57 32 AlarmWatch I know it is byte[] cause I've set the option build as embeded resource, but...comparing with this line that is correct "this.label1.Font = new System.Drawing.Font("OCR A Extended", 24F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));" How can I set this.label1 to use the new font??? thanks

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• c# HTTPListener encoding issue

  - by Rob Griffin

  I have a Java application sending HTTP requests to a C# application. The C# app uses HTTPListener to listen for requests and respond. On the Java side I'm encoding the URL using UTF-8. When I send a \ character it gets encoded as %5C as expected but on the C# side it becomes a / character. The encoding for the request object is Windows-1252 which I think may be causing the problem. How do I set the default encoding to UTF-8? Currently I'm doing this to convert the encoding: foreach (string key in request.QueryString.Keys) { if (key != null) { byte[] sourceBytes =request.ContentEncoding.GetBytes(request.QueryString[key]); string value = Encoding.UTF8.GetString(sourceBytes)); } } This handles the non ASCII characters I'm also sending but doesn't fix the slash problem. Examining request.QueryString[key] in the debugger shows that the / is already there.

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• After extending the User model in django, how do you create a ModelForm?

  - by mlissner

  I extended the User model in django to include several other variables, such as location, and employer. Now I'm trying to create a form that has the following fields: First name (from User) Last name (from User) Location (from UserProfile, which extends User via a foreign key) Employer (also from UserProfile) I have created a modelform: from django.forms import ModelForm from django.contrib import auth from alert.userHandling.models import UserProfile class ProfileForm(ModelForm): class Meta: # model = auth.models.User # this gives me the User fields model = UserProfile # this gives me the UserProfile fields So, my question is, how can I create a ModelForm that has access to all of the fields, whether they are from the User model or the UserProfile model? Hope this makes sense. I'll be happy to clarify if there are any questions.

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• Service Broker message_body error when casting binary data to xml in C#

  - by TimBuckTwo

  I am using Message Broker with Sql server 2008, and designing an External Activator service to consume messages from my target queue. My Problem: Cant cast the returned message body from the SqlDataReader object: "WAITFOR (RECEIVE TOP(1) conversation_handle, message_type_name, message_body FROM [{1}]), TIMEOUT {2}" operation, I cant cast the binary data to XML in C# SqlBinary MessageBody = reader.GetSqlBinary(2); MemoryStream memstream = new MemoryStream(); XmlDocument xmlDoc = new XmlDocument(); memstream.Write(MessageBody.Value, 0, MessageBody.Length); memstream.Position= 0; //below line Fails With Error:{"Data at the root level is invalid. Line 1, position 1."} xmlDoc.LoadXml(Encoding.ASCII.GetString(memstream.ToArray())); memstream.Close(); To prevent poison message I do not use CAST(message_body as XML), Any suggestions would be greatly appreciated.

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