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• Mac OS X: Best way to do runtime check for retina display?

  - by Todd Ditchendorf

  Given a Cocoa application which runs on Mac OS X 10.7 and later: What is the best way to check, at runtime, if your app is currently running on a Mac with at least one retina display attached? If checking for this sort of thing is just really wrong-headed, I fully welcome a well-reasoned explanation of why. But I'd still like to know :). It seems likely you could just do a check specifically for the new Mac Book Pro "Retina" hardware (the only Mac at this time which currently has a retina display), but ideally, I'd really prefer a more general/generic/future-proof way to check than this. Ideally, I'd like to know how to detect the retina display, not the specific Mac model which currently happens to ship with a retina display.

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• IL emit - operation could destabilize runtime when storing then loading

  - by Jakob Botsch Nielsen

  Hey, so I have the following IL: il.Emit(OpCodes.Ldarg_0); il.Emit(OpCodes.Ret); Which works fine. It basically returns the argument given. This, however: il.Emit(OpCodes.Ldarg_0); il.Emit(OpCodes.Stloc_0); il.Emit(OpCodes.Ldloc_0); il.Emit(OpCodes.Ret); Does not work. It crashes with the exception "Operation could destabilize the runtime.". Now, I know that the purpose of that is useless but I'm trying to reach my goal by small steps. Why does that not work?

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• UIView Horizontal scroll for a part of a screen

  - by Futur

  Hi Friends, I have a requirement for scrolling a part of a view horizontally. there are 2 views, mainView(0,70,320*2,400) and a horizontalView(0,0,320*2,160)[this horizontalView has an internal UIScrollView with the same frame] So the horizontal view will occupy the first section of the screen and it should only be scrollable horizontally (and the other part of the mainView - the other part of the screen should be static). how to achieve this? i am getting a general scroll for the whole page not for the first section alone. am i in the right direction for this problem? please advice Thank you

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• Checking if an element is visible in Chrome using Selenium Remote WebDriver

  - by Stuart

  Is there a cross browser solution to check if an element is visible using WebDriver? The solution for IE and firefox is to cast the object to a RenderedRemoteWebElement and then call the property Displayed. I'm using the following methods to return if a element is visible: /// <summary> /// Check if the control is visible. /// </summary> public bool IsVisible() { IWebElement control = mSelenium.FindElement(mFindBy); return ((RenderedRemoteWebElement)control).Displayed; } The problem is when I run this using Chrome, I get an exception when casting to type RenderedRemoteWebElement, this is not really the problem as I can catch this, but I need to a solution to check if an element is visible in chrome. Thanks

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• Check if a SQL table exists.

  - by Carra

  What's the best way to check if a table exists in a Sql database in a database independant way? I came up with: bool exists; const string sqlStatement = @"SELECT COUNT(*) FROM my_table"; try { using (OdbcCommand cmd = new OdbcCommand(sqlStatement, myOdbcConnection)) { cmd.ExecuteScalar(); exists = true; } } catch (Exception ex) { exists = false; } Is there a better way to do this? This method will not work when the connection to the database fails. I've found ways for Sybase, SQL server, Oracle but nothing that works for all databases.

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• How to receive packets on the MCU's serial port?

  - by itisravi

  Hello, Consider this code running on my microcontroller unit(MCU): while(1){ do_stuff; if(packet_from_PC) send_data_via_gpio(new_packet); //send via general purpose i/o pins else send_data_via_gpio(default_packet); do_other_stuff; } The MCU is also interfaced to a PC via a UART.Whenever the PC sends data to the MCU, the *new_packet* is sent, otherwise the *default_packet* is sent.Each packet can be 5 or more bytes with a pre defined packet structure. My question is: 1.Should i receive the entire packet from PC using inside the UART interrut service routine (ISR)? In this case, i have to implement a state machine inside the ISR to assemble the packet (which can be lengthy with if-else or switch-case blocks). 2.Detect a REQUEST command (one byte)from the PC in my ISR set a flag, diable UART interrupt alone and form the packet in my while(1) loop by polling the UART?

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• java code for capture the image by webcam

  - by Navneet

  I am using windows7 64 bit operating system. The source code is for capturing the image by webcam: import javax.swing.*; import javax.swing.event.*; import java.io.*; import javax.media.*; import javax.media.format.*; import javax.media.util.*; import javax.media.control.*; import javax.media.protocol.*; import java.util.*; import java.awt.*; import java.awt.image.*; import java.awt.event.*; import com.sun.image.codec.jpeg.*; public class SwingCapture extends Panel implements ActionListener { public static Player player = null; public CaptureDeviceInfo di = null; public MediaLocator ml = null; public JButton capture = null; public Buffer buf = null; public Image img = null; public VideoFormat vf = null; public BufferToImage btoi = null; public ImagePanel imgpanel = null; public SwingCapture() { setLayout(new BorderLayout()); setSize(320,550); imgpanel = new ImagePanel(); capture = new JButton("Capture"); capture.addActionListener(this); String str1 = "vfw:Logitech USB Video Camera:0"; String str2 = "vfw:Microsoft WDM Image Capture (Win32):0"; di = CaptureDeviceManager.getDevice(str2); ml = di.getLocator(); try { player = Manager.createRealizedPlayer(ml); player.start(); Component comp; if ((comp = player.getVisualComponent()) != null) { add(comp,BorderLayout.NORTH); } add(capture,BorderLayout.CENTER); add(imgpanel,BorderLayout.SOUTH); } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) { Frame f = new Frame("SwingCapture"); SwingCapture cf = new SwingCapture(); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { playerclose(); System.exit(0);}}); f.add("Center",cf); f.pack(); f.setSize(new Dimension(320,550)); f.setVisible(true); } public static void playerclose() { player.close(); player.deallocate(); } public void actionPerformed(ActionEvent e) { JComponent c = (JComponent) e.getSource(); if (c == capture) { // Grab a frame FrameGrabbingControl fgc = (FrameGrabbingControl) player.getControl("javax.media.control.FrameGrabbingControl"); buf = fgc.grabFrame(); // Convert it to an image btoi = new BufferToImage((VideoFormat)buf.getFormat()); img = btoi.createImage(buf); // show the image imgpanel.setImage(img); // save image saveJPG(img,"c:\\test.jpg"); } } class ImagePanel extends Panel { public Image myimg = null; public ImagePanel() { setLayout(null); setSize(320,240); } public void setImage(Image img) { this.myimg = img; repaint(); } public void paint(Graphics g) { if (myimg != null) { g.drawImage(myimg, 0, 0, this); } } } public static void saveJPG(Image img, String s) { BufferedImage bi = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB); Graphics2D g2 = bi.createGraphics(); g2.drawImage(img, null, null); FileOutputStream out = null; try { out = new FileOutputStream(s); } catch (java.io.FileNotFoundException io) { System.out.println("File Not Found"); } JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi); param.setQuality(0.5f,false); encoder.setJPEGEncodeParam(param); try { encoder.encode(bi); out.close(); } catch (java.io.IOException io) { System.out.println("IOException"); } } } This code is sucessfully compiled. On running the code, the following runtime error occurs: Exception in thread "VFW Request Thread" java.lang.UnsatisfiedLinkError:JMFSecurityManager: java.lang.UnsatisfiedLinkError:no jmvfw in java.library.path at com.sun.media.JMFSecurityManager.loadLibrary(JMFSecurityManager.java:206) at com.sun.media.protocol.vfw.VFWCapture.<clinit><VFWCapture.java:19> at com.sun.media.protocol.vfw.VFWSourceStream.doConnect(VFWSourceStream.java:241) at com.sun.media.protocol.vfw.VFWSourceStream.run(VFWSourceStream.java:763) at java.cdlang.Thread.run(Thread.java:619) Please send me solution of this problem/

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• vb.net : is it possible to connect to sql server 2008 via odbc but not through vb.net code?

  - by phill

  I'm supporting an old vb.net program whose database it connected to was moved from SQL Server 2005 to SQL Server 2008. Is there a setting on SQL Server 2008 which will allow ODBC connections to access the database but not allow VB.NET to connect to it programmatically? the error i keep receiving in the app is: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server) however I can connect to it when I create a system dsn to the sql server instance and through VS2005's Tools Connect to Database. Here is the code I'm using to connect: dim strC as string strC = "data source=bob; database=subscribers; user id=bobuser; password=passme" dim connection as New SqlClient.SqlConnection(strC) try connection.open() catch ex as Exception msgbox(ex.message) end try connection.Close()

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• How to change mime type of email notifications sent by PeopleSoft?

  - by skanjo

  I work near some PeopleSoft guys and they asked how to change a link in an email notification sent by PeopleSoft so that it is friendly, basically they just wanted the use of an HTML anchor. After sitting down with them and looking through the code I found that the default mime type for all email notifications is text/plain and there does not seem to be any kind of an email API that is called which would allow setting the mime type of the body to text/html. Furthermore, there seems to be no general email configuration in PeopleSoft to, for example, set the default mime type for all emails. Do you know how to change the mime type of an email in PeopleSoft?

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• win7 + vc7.1 + mfc = stackoverflow

  - by fogbit

  Hello! I've moved my vc7.1 project from WInXP to Win7. After rebuilding i got stackoverflow error in function _malloc_dbg when i start the program. "Unhandled exception at 0x0051bf0f in XXX.exe: 0xC00000FD: Stack overflow." Call stack: msvcr71d.dll!_malloc_dbg(unsigned int nSize=140, int nBlockUse=2, const char * szFileName=0x10267784, int nLine=163) msvcr71d.dll!_calloc_dbg(unsigned int nNum=1, unsigned int nSize=140, int nBlockUse=2, const char * szFileName=0x10267784, int nLine=163) msvcr71d.dll!_mtinit() msvcr71d.dll!_CRTDLL_INIT(void * hDllHandle=0x10200000, unsigned long dwReason=1, void * lpreserved=0x0018fd24) I tried to set up different stacksizes in project options (from 10 to 100 mbytes), in all cases i got this error. How can i fix this?

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• How efficient is an if statement compared to a test that doesn't use an if? (C++)

  - by Keand64

  I need a program to get the smaller of two numbers, and I'm wondering if using a standard "if x is less than y" int a, b, low; if (a < b) low = a; else low = a; is more or less efficient than this: int a, b, low; low = b + ((a - b) & ((a - b) >> 31)); (or the variation of putting int delta = a - b at the top and rerplacing instances of a - b with that). I'm just wondering which one of these would be more efficient (or if the difference is to miniscule to be relevant), and the efficiency of if-else statements versus alternatives in general.

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• Any strategies for assessing the trade-off between CPU loss and memory gain from compression of data

  - by indiehacker

  Are very large TextProperties a burden? Should they be compressed? Say I have a information stored in 2 attributes of type TextProperty in my datastore entities. The strings are always the same length of 65,000 characters and have lots of repeating integers, a sample appearing as follows: entity.pixel_idx = 0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,5,5,5,5,5,5,5,5,5,5,5,5....etc. entity.pixel_color = 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1,1,1,1,1,1,1,1,1,1,1,1,...etc. So these above could also be represented using much less storage memory by compressing say using only each integer and the length of its series ( '0,8' for '0,0,0,0,0,0,0,0') but then its takes time and CPU to compress and decompress? Any general ideas? Are there some tricks for testing different attempts to the problem?

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• Threads to make video out of images

  - by masood

  updates: I think/ suspect the imageIO is not thread safe. shared by all threads. the read() call might use resources that are also shared. Thus it will give the performance of a single thread no matter how many threads used. ? if its correct . what is the solution (in practical code) Single request and response model at one time do not utilizes full network/internet bandwidth, thus resulting in low performance. (benchmark is of half speed utilization or even lower) This is to make a video out of an IP cam that gives a new image on each request. http://149.5.43.10:8001/snapshot.jpg It makes a delay of 3 - 8 seconds no matter what I do. Changed thread no. and thread time intervals, debugged the code by System.out.println statements to see if threads work. All seems normal. Any help? Please show some practical code. You may modify mine. This code works (javascript) with much smoother frame rate and max bandwidth usage. but the later code (java) dont. same 3 to 8 seconds gap. <!DOCTYPE html> <html> <head> <script type="text/javascript"> (function(){ var img="/*url*/"; var interval=50; var pointer=0; function showImg(image,idx) { if(idx<=pointer) return; document.body.replaceChild(image,document.getElementsByTagName("img")[0]); pointer=idx; preload(); } function preload() { var cache=null,idx=0;; for(var i=0;i<5;i++) { idx=Date.now()+interval*(i+1); cache=new Image(); cache.onload=(function(ele,idx){return function(){showImg(ele,idx);};})(cache,idx); cache.src=img+"?"+idx; } } window.onload=function(){ document.getElementsByTagName("img")[0].onload=preload; document.getElementsByTagName("img")[0].src="/*initial url*/"; }; })(); </script> </head> <body> <img /> </body> </html> and of java (with problem) : package camba; import java.applet.Applet; import java.awt.Button; import java.awt.Graphics; import java.awt.Image; import java.awt.Label; import java.awt.Panel; import java.awt.TextField; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.net.URL; import java.security.Timestamp; import java.util.Date; import java.util.concurrent.TimeUnit; import java.util.concurrent.atomic.AtomicBoolean; import javax.imageio.ImageIO; public class Camba extends Applet implements ActionListener{ Image img; TextField textField; Label label; Button start,stop; boolean terminate = false; long viewTime; public void init(){ label = new Label("please enter camera URL "); add(label); textField = new TextField(30); add(textField); start = new Button("Start"); add(start); start.addActionListener(this); stop = new Button("Stop"); add(stop); stop.addActionListener(this); } public void actionPerformed(ActionEvent e){ Button source = (Button)e.getSource(); if(source.getLabel() == "Start"){ for (int i = 0; i < 7; i++) { myThread(50*i); } System.out.println("start..."); } if(source.getLabel() == "Stop"){ terminate = true; System.out.println("stop..."); } } public void paint(Graphics g) { update(g); } public void update(Graphics g){ try{ viewTime = System.currentTimeMillis(); g.drawImage(img, 100, 100, this); } catch(Exception e) { e.printStackTrace(); } } public void myThread(final int sleepTime){ new Thread(new Runnable() { public void run() { while(!terminate){ try { TimeUnit.MILLISECONDS.sleep(sleepTime); } catch (InterruptedException ex) { ex.printStackTrace(); } long requestTime= 0; Image tempImage = null; try { URL pic = null; requestTime= System.currentTimeMillis(); pic = new URL(getDocumentBase(), textField.getText()); tempImage = ImageIO.read(pic); } catch(Exception e) { e.printStackTrace(); } if(requestTime >= /*last view time*/viewTime){ img = tempImage; Camba.this.repaint(); } } }}).start(); System.out.println("thread started..."); } }

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• How can ishow Form in process1 from Form in process2 ?

  - by Al0NE

  Hi I'm trying to show hidden form in process1 from another one was called by : Process.Start(@"F:\MyOtherFormPath\MyOtherForm.exe",this.Handle.ToInt32()); As you can see i passed the handle number of the hidden form ,which i'm calling the "MyOtherForm" from, and i used this number to get a handle and show the hidden form from my "MyOtherForm" like this : Form newFrm = Form.FromHandle(new IntPtr(long.Parse(handleNumberOfMyHiddenForm))); newFrm.show(); But it didn't work, any way to do this . P.S: it didn't throw any exception . thanx in advanced ..

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• Can FLV AAC stream be played in Android

  - by HariKJ

  Hi, I'm trying to build a radio player and the client is providing a stream which is a FLV container with the audio being AAC When I read the headers it shows up as audio/aacp. I have tried all possible ways such as using the 1) Streaming through mediaplayer (Does not work) 2) Use the NPR mode of using a proxy stream (I get a broken pipe exception) 3) Play it in chunks ( Plays but I need the SDCard and the playback is not very great) 4) Use the GPL'd FAAD2 Library but I would have to pay the royalty fee Can some one help me out on figuring this issue out. The last option that I have is to have my client change the stream to mp3 container (which I know that it works) Regards, Hari

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• MySQL with Java: Open connection only if possible

  - by emempe

  I'm running a database-heavy Java application on a cluster, using Connector/J 5.1.14. Therefore, I have up to 150 concurrent tasks accessing the same MySQL database. I get the following error: Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Too many connections This happens because the server can't handle so many connections. I can't change anything on the database server. So my question is: Can I check if a connection is possible BEFORE I actually connect to the database? Something like this (pseudo code): check database for open connection slots if (slot is free) { Connection cn = DriverManager.getConnection(url, username, password); } else { wait ... } Cheers

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• Killing a script launched in a Process via os.system()

  - by L.J.

  I have a python script which launches several processes. Each process basically just calls a shell script: from multiprocessing import Process import os import logging def thread_method(n = 4): global logger command = "~/Scripts/run.sh " + str(n) + " >> /var/log/mylog.log" if (debug): logger.debug(command) os.system(command) I launch several of these threads, which are meant to run in the background. I want to have a timeout on these threads, such that if it exceeds the timeout, they are killed: t = [] for x in range(10): try: t.append(Process(target=thread_method, args=(x,) ) ) t[-1].start() except Exception as e: logger.error("Error: unable to start thread") logger.error("Error message: " + str(e)) logger.info("Waiting up to 60 seconds to allow threads to finish") t[0].join(60) for n in range(len(t)): if t[n].is_alive(): logger.info(str(n) + " is still alive after 60 seconds, forcibly terminating") t[n].terminate() The problem is that calling terminate() on the process threads isn't killing the launched run.sh script - it continues running in the background until I either force kill it from the command line, or it finishes internally. Is there a way to have terminate also kill the subshell created by os.system()?

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• navigation between screens Iphone programming

  - by Sephy

  Hi, I don't know if my question will be clear or not, but i'm starting basic stuff with iphone programming, and i'm trying to understand how to go from a screen to another. lets say i have a screen with a "next page" button and another page with a "return" button. I have a general idea of how to do this, but I don't know how to put it together. I think I need an IBAction method for each button, and in each method a navigation controller with pushViewController. So far, i've tried the following code, but even if it compiles properly and runs when i push the button, there is no change of screen... -(IBAction) toNext(id)sender{ NSLog(@"before code"); NextViewController *nvc = [[NextViewController alloc] initWithNibName:@"NextView" bundle:nil]; [self.navigationController pushViewController:nvc animated:YES]; [nvc release]; NSLog(@"after code"); } If someone had a nice tuto for me, it could be of some help... thx

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• C++ boost ublas + units dimension constraints

  - by aaa

  hello. I am seeking advice on design/general idea on how to force matrix dimension constraints on ublas matrix/vector possibly using boost units. For example, let matrix A have dimensions of time x force (for example) // does not have dimensions, time x force and force x time are not distinguished. matrix<double> A; //something like? dimension<time, force, matrix<double> > A; dimension<force, time, matrix<double> > B = trans(A); have you done something like this or do you have some good idea about how to organize such constraints? Thank you

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• Rails 2 and Ngnix: https pages can't load css or js (but will load graphics)

  - by Max Williams

  ADMISSION: i've posted this same question on stackoverflow, before realising it's probabaly better suited to superuser, but it kind of depends on the answer: If it turns out to be a problem in my nginx config, it's definitely superuser. If it turns out to be a problem in my Rails config (or code) then it's arguably stackoverflow. I'm adding some https pages to my rails site. In order to test it locally, i'm running my site under one mongrel_rails instance (on 3000) and nginx. I've managed to get my nginx config to the point where i can actually go to the https pages, and they load. Except, the javascript and css files all fail to load: looking in the Network tab in chrome web tools, i can see that it is trying to load them via an https url. Eg, one of the non-working file urls is https://cmw-local.co.uk/stylesheets/cmw-logged-out.css?1383759216 I have these set up (or at least think i do) in my nginx config to redirect to the http versions of the static files. This seems to be working for graphics, but not for css and js files. If i click on this in the Network tab, it takes me to the above url, which redirects to the http version. So, the redirect seems to be working in some sense, but not when they're loaded by an https page. Like i say, i thought i had this covered in the second try_files directive in my config below, but maybe not. Can anyone see what i'm doing wrong? thanks, Max Here's my nginx config - sorry it's a bit lengthy! I think the error is likely to be in the first (ssl) server block: server { listen 443 ssl; keepalive_timeout 70; ssl_certificate /home/max/work/charanga/elearn_container/elearn/config/nginx/certs/max-local-server.crt; ssl_certificate_key /home/max/work/charanga/elearn_container/elearn/config/nginx/certs/max-local-server.key; ssl_session_cache shared:SSL:10m; ssl_session_timeout 10m; ssl_protocols SSLv3 TLSv1; ssl_ciphers RC4:HIGH:!aNULL:!MD5; ssl_prefer_server_ciphers on; server_name elearning.dev cmw-dev.co.uk cmw-dev.com cmw-nginx.co.uk cmw-local.co.uk; root /home/max/work/charanga/elearn_container/elearn; # ensure that we serve css, js, other statics when requested # as SSL, but if the files don't exist (i.e. any non /basket controller) # then redirect to the non-https version location / { try_files $uri @non-ssl-redirect; } # securely serve everything under /basket (/basket/checkout etc) # we need general too, because of the email/username checking location ~ ^/(basket|general|cmw/account/check_username_availability) { # make sure cached copies are revalidated once they're stale add_header Cache-Control "public, must-revalidate, proxy-revalidate"; # this serves Rails static files that exist without running # other rewrite tests try_files $uri @rails-ssl; expires 1h; } location @non-ssl-redirect { return 301 http://$host$request_uri; } location @rails-ssl { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_read_timeout 180; proxy_next_upstream off; proxy_pass http://127.0.0.1:3000; expires 0d; } } #upstream elrs { # server 127.0.0.1:3000; #} server { listen 80; server_name elearning.dev cmw-dev.co.uk cmw-dev.com cmw-nginx.co.uk cmw-local.co.uk; root /home/max/work/charanga/elearn_container/elearn; access_log /home/max/work/charanga/elearn_container/elearn/log/access.log; error_log /home/max/work/charanga/elearn_container/elearn/log/error.log debug; client_max_body_size 50M; index index.html index.htm; # gzip html, css & javascript, but don't gzip javascript for pre-SP2 MSIE6 (i.e. those *without* SV1 in their user-agent string) gzip on; gzip_http_version 1.1; gzip_vary on; gzip_comp_level 6; gzip_proxied any; gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript; #text/html # make sure gzip does not lose large gzipped js or css files # see http://blog.leetsoft.com/2007/7/25/nginx-gzip-ssl gzip_buffers 16 8k; # Disable gzip for certain browsers. #gzip_disable "MSIE [1-6].(?!.*SV1)"; gzip_disable "MSIE [1-6]"; # blank gif like it's 1995 location = /images/blank.gif { empty_gif; } # don't serve files beginning with dots location ~ /\. { access_log off; log_not_found off; deny all; } # we don't care if these are missing location = /robots.txt { log_not_found off; } location = /favicon.ico { log_not_found off; } location ~ affiliate.xml { log_not_found off; } location ~ copyright.xml { log_not_found off; } # convert urls with multiple slashes to a single / if ($request ~ /+ ) { rewrite ^(/)+(.*) /$2 break; } # X-Accel-Redirect # Don't tie up mongrels with serving the lesson zips or exes, let Nginx do it instead location /zips { internal; root /var/www/apps/e_learning_resource/shared/assets; } location /tmp { internal; root /; } location /mnt{ root /; } # resource library thumbnails should be served as usual location ~ ^/resource_library/.*/*thumbnail.jpg$ { if (!-f $request_filename) { rewrite ^(.*)$ /images/no-thumb.png break; } expires 1m; } # don't make Rails generate the dynamic routes to the dcr and swf, we'll do it here location ~ "lesson viewer.dcr" { rewrite ^(.*)$ "/assets/players/lesson viewer.dcr" break; } # we need this rule so we don't serve the older lessonviewer when the rule below is matched location = /assets/players/virgin_lesson_viewer/_cha5513/lessonViewer.swf { rewrite ^(.*)$ /assets/players/virgin_lesson_viewer/_cha5513/lessonViewer.swf break; } location ~ v6lessonViewer.swf { rewrite ^(.*)$ /assets/players/v6lessonViewer.swf break; } location ~ lessonViewer.swf { rewrite ^(.*)$ /assets/players/lessonViewer.swf break; } location ~ lgn111.dat { empty_gif; } # try to get autocomplete school names from memcache first, then # fallback to rails when we can't location /schools/autocomplete { set $memcached_key $uri?q=$arg_q; memcached_pass 127.0.0.1:11211; default_type text/html; error_page 404 =200 @rails; # 404 not really! Hand off to rails } location / { # make sure cached copies are revalidated once they're stale add_header Cache-Control "public, must-revalidate, proxy-revalidate"; # this serves Rails static files that exist without running other rewrite tests try_files $uri @rails; expires 1h; } location @rails { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_read_timeout 180; proxy_next_upstream off; proxy_pass http://127.0.0.1:3000; expires 0d; } }

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• System.Linq.Dynamic and DateTime

  - by Matthew Hood

  I am using System.Linq.Dynamic to do custom where clauses from an ajax call in .Net MVC 1.0. It works fine for strings, int etc but not for DateTime, I get the exception cannot compare String to DateTime. The very simple test code is items = items.Where(string.Format(@" {0} {1}{2}{1} ", searchField, delimiter, searchString)); Where searchField will be for example start_date and the data type is DateTime, delimiter is " (tried with nothing as well) and searchString will be 01-Jan-2009 (tried with 01/01/2009 as well) and items is an IQueryable from LinqToSql. Is there a way of specifying the data type in a dynamic where, or is there a better approach. It is currently already using some reflection to work out what type of delimiter is required.

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• JSF skips phases - How to debug that?

  - by Pentius

  Hey fellows, I have to debug a foreign jsf application thanks god. The problem is, that I submit a form, but the values aren't carried over. With a phase listener I can see, that the life cycle doesn't run completely through, so to say it skips phase 2 -5: After the restore view phase, the render response phase is directly called. I miss the apply values, validation, update model actions and so on. So, this could be a chicken-and-egg problem: 1. The responsible phases aren't called, so the new form input can't be carried over. 2. The system doesn't recognize any new input and therefore directly renders after restoring the view. I checked that there is no call of responseComplete() oder renderResponse(). I'm stuck somehow. Any idea to validate one of the two hypothesis? Or how to debug that in general? Did anybody have a similar problem?

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• migrating C++ code from structures to classes

  - by eSKay

  I am migrating some C++ code from structures to classes. I was using structures mainly for bit-field optimizations which I do not need any more (I am more worried about speed than saving space now). What are the general guidelines for doing this migration? I am still in the planning stage as this is a very big move affecting a major part of the code. I want to plan everything first before doing it. What are all the essential things I should keep in mind?

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• How can I use different metadata for a Dynamic Data form view and the list view?

  - by ProfK

  We often need a summarised list view with more detailed form view. So far, the only two way I can think of doing this are using a 'custom' list or form view than uses a sumplimentary 'remove' or 'add' list of fields anb generalise this over all entity sets, or create a custom metadata provider that infers somehow which columns to supply. Are there any other ways of distinguishing these two views? PS, I wrote a fun little general details page, that handles insert, edit, and view, all on one page template. Maybe I could somehow use that? It's here.

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• In SQL / MySQL, what is the difference between "On" and "Where" in a join statement?

  - by Jian Lin

  The following statements give the same result (one is using "on", and the other using "where"): mysql> select * from gifts INNER JOIN sentGifts on gifts.giftID = sentGifts.giftID; mysql> select * from gifts INNER JOIN sentGifts where gifts.giftID = sentGifts.giftID; I can only see in a case of a Left Outer Join finding the "unmatched" cases: (to find out the gifts that were never sent by anybody) mysql> select name from gifts LEFT OUTER JOIN sentgifts on gifts.giftID = sentgifts.giftID where sentgifts.giftID IS NULL; In this case, it is first using "on", and then "where". Does the "on" first do the matching, and then "where" does the "secondary" filtering? Or is there a more general rule of using "on" versus "where"? Thanks.

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