Is it Buffering?
What is that, that is specific to the d/b table <b>COEP</b>, that a <b>SELECT</b> query in a report on this table consumes more time when it is run for the first time, however in the subsequent runs it doesn't even consume half of the time of its first run.
Hi,
This is not exactly buffering. Actually what happens is that when you execute a query on any Data Base table then data selected from the table is kept in Cache Memory.
So when you execute a query on the same table again, then the data is taken from the Cache instead of data base table and hence it is faster.
This Cache is present till your session lasts. If you log off and login again then the time taken by two queries should be same.
Hope this clarifies your doubt. Please revert back if you need some more details on this.
Regards,
Lalit Kabra
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How to draw a point without double buffering?
Hello all,
I am drawing points as small red circles, but they are a bit ugly without double buffering. Am I able to draw the points to be nice? I mean not to draw them as just circles, but some special circle with light border that will looks much more nicer?
Or what radius and position of the circle must be to be a nice small circle containing only 5 pixels? (upper, lower, right, left, middle)
ps - they are ugly in the way of having a strange dot on the left sideI use this method:
private static final float POINT_RADIUS = 2f;
private static final float POINT_DIAMETER = POINT_RADIUS * 2;
private void drawPoint(float x, float y, Color c) {
Ellipse2D point = new Ellipse2D.Float(x - POINT_RADIUS, -y
- POINT_RADIUS, POINT_DIAMETER, POINT_DIAMETER);
graphics.setStroke(new BasicStroke(0.2f));
graphics.fill(point);
// and points looks like this:
*** -
Since compelled to take the IOS 7.0.2 "upgrade" I experience 4 - 10 second delays in text inputting. The keystrokes are buffered then displayed. Other signs suggest the processor is under way too much load.
I haev reduced the concurrent apps to 1. turned off location services, most notifications etc etc .
It occurs like this on Twitter and FB, and IM and simple text messages.
Clearly the software is too processor intensive for iPhone 4
Will this be addressed?
Are there more configurations I acn adopt to manage the overload?
I think I ve turned everything off that I can without shutting down the 3G fundctions WiFi and phone.
My smartphone has been rendered dumb by the Apple Core
Needs fixing or I'll shop for a Samsung neXtreset all settings
settings-general-reset-reset all settings
now reconnect to wifi
settings- wifi- click network name- enter password - join
if issue persist back up and restore as new via iTunes
Peace, Clyde -
Constant buffering after 7.0.1 update?
My AppleTV 3 has a gigabit wired connection to my Airport Extreme, along with my Mac Pro running Mavericks 10.9.5 and the new iTunes 12. Trying to stream movies from my ATV now causes buffering 15-60 seconds from the start of the movie and will not begin playing again. It will just buffer forever. Wireless is the same. Restarts fix nothing. Turning off/on Home Sharing fixes nothing. Apps work fine, just local streaming. Any ideas of what can kick-start this thing into working again?
Disappointed, yet not surprised, that once again an AppleTV update breaks something. The worst development quality control in Apple's entire product lineup.error message "some of the items in the iTunes library including "..." were not copied to the ipod "..." because you are not authorized to play them on this computer" total=93
In 2 years I've had this computer and iPod this has never happened... what's going on? Why is it selectively telling me songs I own I'm not authorized to play? The only changes I've made lately is backing up my music to DVD-Rs using 'Back up to disc...".
also, i noticed that it's asking me to use an email address to authorize it if I try to listen to these songs that is my personal address that is not a .mac or aol address, but not my .mac address, but if I enter a password or try to retrieve the password, it says the account doesn't exist. On my PC laptop, this email address is used as the account, however, this is happening on my MAC. Are the files confused thinking they are still on the PC? How do I stop that from happening? -
How to re-route source & gate for Buffered Period in DAmx
I am trying to write a DAQmx program that does the follow :
(1) creates 1 PulseTrain task; this task routes is output to a requested pin with will be used as a SOURCE for a Buffered Period task.
(2) if requested creates a second PulseTrain who's output will be used as the Buffered Period GATE.
(3) the Buffered period task needs to assign ANY SOURCE,GATE and run till its stopped by the user.
Note that this task needs to "sample/read" its data and show it to the user.
My questions are :
(a) is the PulseTrain "output" re-route done OK ?
(b) how to re-route the Period source/gate - I used DAQmxSetChanAttribute, but I an not sure it is right
©) how to make the Period task write the data into "my program buffer" so I do not have to read it when "stop" is pressed.
I try to run with simulated devices on a P4 3.2GHZ running XP :
First TrainPulse - ctr0, out->RSTI0
Second TrainPulse - ctr1, out->RSTI1
Period - ctr2, source=RSTI1, gate=RSTI0
Running this program with a SIMULATED device - OK (data = 0). with the real device - I get error -200141
I included my code.
Attachments:
DaQmx test.zip 147 KBI have a new question
I need to create an event buffered task when the source=80mhz internal card timebase, gate=source of other counter (e.q for counter 1 use 0, for 3 use 2)
I know that with Traditional-DAQ it will look like )see attch file):
Now the convertion to DAQmx :
++++++++++++++++++++++++++++++
void SetupEvent(void)
if ( Internal.P6602_ID == -1 ) return;
sprintf(Chan,"Dev%d/ctr1",Internal.P6602_ID); // channel 1
DAQmxErrChk (DAQmxCreateTask("EventChan1",&DaqmxTasks.PCI_6602[1]));
DAQmxErrChk (DAQmxCreateCICountEdgesChan(DaqmxTasks.PCI_6602[1],Chan,"EventChan1",DAQmx_Val_Rising,0,
DAQmx_Val_CountUp));
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[1], DAQmx_SampTimingType, DAQmx_Val_SampClk) );
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[1], DAQmx_SampQuant_SampMode,DAQmx_Val_ContSamps) );
DAQmxErrChk(DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[1],DAQmx_SampQuant_SampPerChan, BUF_MAX));
// set source
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[1], DAQmx_SampClk_Src, "/Dev1/80MHzTimebase"));
// and gate
sprintf(msg,"/Dev%d/ctr0Source",Internal.P6602_ID);
DAQmxErrChk(DAQmxSetChanAttribute (DaqmxTasks.PCI_6602[1], Chan, DAQmx_CI_CountEdges_Term, msg,0));
sprintf(Chan,"Dev%d/ctr3",Internal.P6602_ID); // channel 3
DAQmxErrChk (DAQmxCreateTask("EventChan3",&DaqmxTasks.PCI_6602[3]));
DAQmxErrChk (DAQmxCreateCICountEdgesChan(DaqmxTasks.PCI_6602[3],Chan,"EventChan3",DAQmx_Val_Rising,0,
DAQmx_Val_CountUp));
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[3], DAQmx_SampTimingType, DAQmx_Val_SampClk) );
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[3], DAQmx_SampQuant_SampMode,DAQmx_Val_ContSamps) );
DAQmxErrChk(DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[3],DAQmx_SampQuant_SampPerChan, BUF_MAX));
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[1], DAQmx_SampClk_Src, "/Dev1/80MHzTimebase"));
sprintf(msg,"/Dev%d/ctr2Source",Internal.P6602_ID);
DAQmxErrChk(DAQmxSetChanAttribute (DaqmxTasks.PCI_6602[3], Chan, DAQmx_CI_CountEdges_Term, msg,0));
return;
Error:
Internal.StartStop = OFF;
if ( DAQmxFailed(error) ) DAQmxGetExtendedErrorInfo(errBuff,1024);
StopCallBack();
MessagePopup ("SetupEvent Error", errBuff);
return;
I am not sure this is the way to do it .
Can samebody help ?
Thanks, Galia
Attachments:
AutoScannerDAQCards.c 20 KB -
Apple TV (2nd gen) - Very Specific Buffering Issue
I have been watching the threads regularly for a situation similar to mine but I can't see one so I am starting a new one.
I have Four (4) Apple TVs in the house and a large library of movies, TV shows and personal movies loaded into iTunes on a Window 7 64 bit system with an Intel i7 processor, 12 GB of memory and 2TB of disk space. Everything seemed to work OK until I got the third Apple TV but that was a year ago and several software upgrades in the past.
My problem is that when all four (4) Apple TVs are plugged into power, even if the ones I am not using are asleep, I have horrible buffering delays when watching vidoes from iTunes on the Windows PC. I do not have any trouble streaming video from Netflix or the iTunes store directly. When the Apple TV stops to fill buffers it seems to lock up trying and never comes back (I have waited up to 30 minutes). However, if I exit out of the movie as soon as the buffering issue starts, and go back into the video where I left off - it starts playing again within 3 seconds and will carry on for another random period of time in the range of 2 minutes to 10 minutes.
Before anyone starts responding with the basic stock suggestions, I am a retired IT guy who has put a lot of time and technical effort into trying to find the root cause of this problem. I am very familiar with networking, Windows 7, firewalls, etc.
The work around is that when I want to watch videos from iTunes on my Windows PC I have to unplug the other three Apple TVs, restart my router and reboot my Windows PC. These three steps together work consistently but omitting any one step may or may not improve the situation. This means that I can't just decide to watch a video from iTunes without 10 minutes of advance prep work - and watching two different videos on two different Apple TVs at the same time only works about 30% of the time.
Here is some more background information:
I have two (2) iPhones, one (1) iPad, another Windows 7 64 bit PC, a MacBook Air, and stand alone Internet radio on my network. The problem persists even when all the other devices have been powered off.
All devices, including the Apple TVs, are running the most current version of software and have ALL patches installed.
I have upgraded my router (twice) and now have an ASUS RT-N56U dual band router with the Windows PCs both cable connected and the Apple TVs and all the other stuff running wireless.
I have used netstumbler to detect other networks and have tried various different channels on the router. I am in a low density area and only see two other neighbours with wireless networks.
I have a 20 MB Internet service connection via cable modem and have no problems watching videos on the Apple TVs from the Internet
I have relocated the router away from any other elecrical equipment (Apple TVs all show a full strength signal)
I have tried disabling my MacAfee Security Center virus and personal firewall software (the problem persists), then removing it entirely (the problem persists), then reinstalling only the virus protection component and enabling Windows Firewall (the problem persists).
I have removed all software from the Windows computer that brand name commercial software - I use Microsoft Office 2010 and Google Chrome as my browser (the problem persists).
Important - I have moved the complete iTunes library to a 2TB USB hard drive and run iTunes on my MacBook Air with the Windows PCs turned off (the problem persists).
There is one issue that seems relevant, but might just be a bug in the router management interface. I have set up reserved DHCP addresses for the Apple TVs and the computers to make it easier to identify devices when I am troubleshooting. The DHCP log shows the correct IP addresses being assigned to the correct MAC addresses but the network map screen frequently displays two or more Apple TVs with duplicate MAC addresses. It only happens with the Apple TVs and has never happened with anything else. This is what gave me the idea to turn off all Apple TVs except the one I want to watch and reset the router to clear the other addresses - which seems to be the only consistent way to watch an iTunes video without buffering problems.
Any ideas would be greatly appreciated. I have invested a lot of time and money in Apple technologies and setting up this home video strategy. It's very frustrating that it doesn't work reliably.
Thanks
Bob TI too am having this issue were two of my Apple TVs are showing duplicate MAC Addresses. I have varrified this by looking at the arp -a cache on multiple machines. I believe this is a major bug in the Apple TV software. Can we please get a fix.
-
VMS Client Channel Buffering Problem
I just received my new Verizon VMS system which includes 2 client units. I hooked everything up and all was working as it should except that when watching live TV on the two client units, it will not buffer two different TV channels and allow me to switch back and forth between these two channels and rewind, fast forward or pause. It will only buffer one channel and when I switch to another, the original channels buffer is gone. I could do this on all three of my standard HD DVR boxes before swithcing to the VMS and this was a huge feature for me as I like to watch multiple shows or sporting events simultaneaously. I called support and after about 90 minutes they could find no problem or find any solution other then to send me a new VMS. The odd thing is when they looked at all of the tuners being used, tuners 3 annd 4 were never getting used. The odder thing is that it seemed to work properly on one of the client boxes until they did a cold init and then that one also stopped allowing 2 channels to be buffered.
Should I be able to buffer two seperate channels on the client boxes as well as the main VMS box or did they for some awful reasone take this feature away from the clients??
Thanks,
EricDOES VMS DO THESE THINGS FOR YOU ?
VZ VMS1100 Video Media Server
From Pg of 2 of Manual
The VMS1100 provides the following advanced functionality:
• Whole home DVR support for up to four connected IP Client set-top boxes
• Authorization and purchase of on-demand programming
• High-Definition television (HDTV) video decoding
• HDTV output through component video (YPbPr) or High-Definition Multimedia Interface™ (HDMI™)
• Surround-sound audio through a variety of analog and digital interconnection options
Live playback and LOD buffering capabilities to pause and time shift live video and seamlessly record for
all connected televisions
• Built-in MoCA 1.1/2.0 HW support
As with all ARRIS digital set-tops, the hardware features are enabled by core operating and third-party
application software.
Tom
Freedom Essentials, QIP 7100 1,Bose SOLO TV Sound System,,QIP 7216 P2,M1424WR Rev F, iPad 2 WiFi,iPhone 5,TV SYST INFO Release 1.9.5 Build No. 17.45
Data Object 39.45 -
Problem with Double Buffering and Swing
Hi
I made a game and basically it works pretty well, my only problem is it flickers really badly right now. I read up on a whole lot of forums about double buffering and none of those methods seemed to work. Then I noticed that Swing has double buffering built in so I tried that but then I get compilation errors and I'm really not sure why. My original code was a console application and worked perfectly, then I ported it into a JApplet and it still works but it flickers and thats what I'm tryign to fix now.
The code below is in my main class under the constructor.
Heres the double buffering code I'm trying to use, I'm sure you all seen it before lol
public void update(Graphics g)
// initialize buffer
if (dbImage == null)
dbImage = createImage(this.getSize().width, this.getSize().height);
dbg = dbImage.getGraphics();
// clear screen in background
dbg.setColor(getBackground());
dbg.fillRect(0, 0, this.getSize().width, this.getSize().height);
// draw elements in background
dbg.setColor(getForeground());
paint(dbg);
// draw image on the screen
g.drawImage(dbImage, 0, 0, this);
}My paint is right under neath and heres how it looks
This snipet of code works but when I change the method to
public paintComponent(Graphics g){
super.paintComponent(g)...
everythign stops working and get a compilation error and says that it can't find paintComponent in javax.swing.JFrame.
public void paint(Graphics g)
super.paint(g);
//if game starting display menue
if (show_menue)
//to restart lives if player dies
lives = 3;
menue.draw_menue(g);
menue_ufo1.draw_shape(g);
menue_ufo2.shape_color = Color.DARK_GRAY;
menue_ufo2.draw_shape(g);
menue_ufo3.shape_color = Color.BLUE;
menue_ufo3.draw_shape(g);
menue_ufo4.shape_color = new Color(82, 157, 22);
menue_ufo4.draw_shape(g);
menue_ufo5.draw_shape(g);
menue_ufo6.shape_color = new Color(130, 3, 3); ;
menue_ufo6.draw_shape(g);
menue_turret.draw_ship(g);
menue_ammo.draw_ammo(g);
else
//otherwise redraw game objects
gunner.draw_ship(g);
y_ammo.draw_ammo(g);
grass.draw_bar(g);
o_ufo.draw_shape(g);
b_ufo.draw_shape(g);
m_ufo.draw_shape(g);
s_ufo.draw_shape(g);
z_ufo.draw_shape(g);
xx_ufo.draw_shape(g);
info.draw_bar(g);
live_painter.draw_lives(g, lives);
score_painter.draw_score(g, score);
level_display.draw_level(g, level);
explosion.draw_boom(g);
}I just want to get rid of the flickering for now so any help will be greatly appreciated. Depending which will be simpler I can either try to double buffer this program or port it all to swing but I'm not sure which elements are effected by AWT and which by Swing. Also I read some of the Java documentation but couldn't really understand how to implement it to fix my program.
Thanks in advance
SebastianThis is a simple animation example quickly thrown together. I have two classes, an animation panel which is a JPanel subclass that overrides paintComponent and draws the animation, and a JApplet subclass that simply holds the animation panel in the applet's contentpane:
SimpleAnimationPanel.java
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JPanel;
import javax.swing.Timer;
class SimpleAnimationPanel extends JPanel
private static final int DELAY = 20;
public static final int X_TRANSLATION = 2;
public static final int Y_TRANSLATION = 2;
private Point point = new Point(5, 32);
private BufferedImage duke = null;
private Timer timer = new Timer(DELAY, new TimerAction());
public SimpleAnimationPanel()
try
// borrow an image from sun.com
duke = ImageIO.read(new URL(
"http://java.sun.com/products/plugin/images/duke.wave.med.gif"));
catch (MalformedURLException e)
e.printStackTrace();
catch (IOException e)
e.printStackTrace();
setPreferredSize(new Dimension(600, 400));
timer.start();
// do our drawing here in the paintComponent override
@Override
protected void paintComponent(Graphics g)
super.paintComponent(g);
if (duke != null)
g.drawImage(duke, point.x, point.y, this);
private class TimerAction implements ActionListener
@Override
public void actionPerformed(ActionEvent e)
int x = point.x;
int y = point.y;
Dimension size = SimpleAnimationPanel.this.getSize();
if (x > size.width)
x = 0;
else
x += X_TRANSLATION;
if (y > size.height)
y = 0;
else
y += Y_TRANSLATION;
point.setLocation(new Point(x, y)); // update the point
SimpleAnimationPanel.this.repaint();
}AnimationApplet.java
import java.lang.reflect.InvocationTargetException;
import javax.swing.JApplet;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class AnimationApplet extends JApplet
public void init()
try
SwingUtilities.invokeAndWait(new Runnable()
public void run()
// construct the panel
JPanel simpleAnimation = new SimpleAnimationPanel();
// put it in the contentPane of the JApplet
getContentPane().add(simpleAnimation);
setSize(simpleAnimation.getPreferredSize());
catch (InterruptedException e)
e.printStackTrace();
catch (InvocationTargetException e)
e.printStackTrace();
}Here's a 3rd bonus class that shows how to put the JPanel into a stand-alone program, a JFrame. It's very similar to doing it in the JApplet:
AnimationFrame.java
import javax.swing.JFrame;
public class AnimationFrame
private static void createAndShowUI()
JFrame frame = new JFrame("SimpleAnimationPanel");
frame.getContentPane().add(new SimpleAnimationPanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
public static void main(String[] args)
java.awt.EventQueue.invokeLater(new Runnable()
public void run()
createAndShowUI();
}Edited by: Encephalopathic on Mar 15, 2008 11:01 PM -
I bought new Macbook Pro 13" around two months before .My Apple ID is working on all other things except app store . It is buffering for a lot of time and lastly coming on screen " can not connect to app store " Please help me
Have you tried repairing disk permissions : iTunes download error -45054
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The past couple of weeks whenever I try to watch the Daily Show and the Colbert Report the screen freezes up every 2 or 3 seconds and the message "buffering" comes on. VERY FRUSTRATING!!!
The past couple of weeks whenever I try to watch the Daily Show and the Colbert Report the screen freezes up every 2 or 3 seconds and the message "buffering" comes on. VERY FRUSTRATING!!!
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Hi,
I need to find out the amount of buffers on the ASR 9001 platform, both for integrated ports and
A9K-MPA-4X10GE.
Do anyone have these available?
Daniel Dib
CCIE #37149
Please rate helpful posts.hi daniel,
the 9001 is based on the MOD80 linecard.
This linecard has 2 NPU's for the feature processing.
Each MPA bay has a dedicated NPU and also serves 2 of the 4 onboard 10GEs.
This NPU has several pieces of memory attached like a TCAM, stats memory, 2xsearch memory for each MAC and L3 FIB
and there is also buffer memory.
This buffer memory is shared is 1G in the TR version and 2G on the SE version of the linecard.
The "LC type" for the 9001 is the SE version hence you have 2G of buffer memory that can be used for all interfaces
depending on their qos policy-map configuration and more particular the queue-limit that is assigned to it.
you can use the command show qos int to see what the hw programmed for queue limit.
regards
xander
Xander Thuijs CCIE #6775
Principal Engineer
ASR9000, CRS, NCS6000 & IOS-XR -
Flash Player keeps pausing and buffering
I've never really had this problem before but today whenever I've tried to watch flash videos, it keeps pausing and buffering every few seconds. This seems to be a problem for me on any website except YouTube (YouTube still works fine). I've tried disabling hardware acceleration but that made no difference. I have a high speed cable modem so I don't see how it could have anything to do with my connection speed.
My operating system is Mac OS 10.5.8. My web browser is Firefox version 3.6.13, I also tried using Safari and was experiencing the same problem. The flash player version I'm using is MAC 10,2,152,26. Any help is greatly appreciated! Thanks a million.o disable Protected Mode, add the following line to your mms.cfg file located in:
Windows 32bit: C:\windows\system32\macromed\flash
Windows 64bit: C:\windows\syswow64\macromed\flash
ProtectedMode=0
If the mms.cfg file does not exist, create one using any standard text editor (e.g.. notepad)
Depending on your operating system, you might need to first save the mms.cfg file to a writable location (such as your documents or desktop folder) and then copy the file into the destination folder using Windows Explorer.
To re-enable Protected Mode, simply remove the line from the mms.cfg file. -
Apple TV - painfully slow buffering
Hi,
I bought an ATV2 last year and it was very responsive, even though my Internet connection at home isn't great (max of 5Mbps). When the ATV3 came out I upgraded to it and for a while it worked fine. However, over the past few months buffering movies has taken so long (typically two hours until they're even ready to play), I've practically given up on them. I've tried lowering video quality (right down to Standard Definition), but this doesn't seem to make any difference. I've also tried re-starting, reseting and restoring the ATV, and fiddling around with the network settings, but this hasn't made any difference either. Netflix content streams fine and at a good quality, it's just iTunes content that's the problem. Looking online, I can see that lots of other users have been reporting similar issues, with some pointing the finger of blame at the last major ATV software update. This certainly seems to tie in with what I've experienced, since I've not changed any aspect of my network setup recently, but have updated the ATV software. Any ideas/suggestions?
ThanksI am in Florida, and have a comcast business account and get download speeds of 22mbps (as tested).
The Apple tv is hooked directly into the modem with ethernet.
We have tried about 6 different routers with apple TV and none of them make the Apple Tv perform without stuttering and buffering. So we decided to use direct hook up.
I have called Apple repetitively because when trying to watch a trailer/preview, the preview stops and the buffering starts.
This will also happen when watching movies.
Lowering TV resolution to 600x480 does not help either.
Apple fail to tell me where their Itunes servers are located, so it's impossible to do a traceroute to see if there's a problem on the way.
Desperate with this situation I opened a DSL account with Centurylink :same problem!!
It seems that Apple should fix their Apple TV product before placing a product on the market that does not perform as stated.
We took this a step further, and purchased a few Apple Tv's which we are setting up with different Internet providers to see what the results are.
You may think I have nothing better to do, but I'm building a case against Apple and shall get to the bottom of this. There are no excuses for placing faulty products on the market. -
Problem in sending buffered image to remote machine
iam able to capture ithe desktop screen as a buffered image by using buffered image class in java.awt.image.but iam bot able to send that buffered image to remote machine.it is only possible to send some part of that buffered image.but iam not able to transmit the whole buffere image of my desktop.can u help.
Hi,
For this topic you should have a look ( 2004-07-08 The Java Specialists' Newsletter [Issue 091] )
from Dr. Heinz Kabutz. Indeed, the newsletter is quite useful and sometimes also amazing.
I really enjoy reading it.
In this newsletter he is exactly doing what you wanted to know.
He uses an ObjectOutputStream, but compresses the screenshot beforehand as follows:
import com.sun.image.codec.jpeg.*;
Toolkit defaultToolkit = Toolkit.getDefaultToolkit();
Rectangle shotArea = new Rectangle(
defaultToolkit.getScreenSize());
ByteArrayOutputStream bout = new ByteArrayOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bout);
encoder.encode(robot.createScreenCapture(shotArea));
return bout.toByteArray();Hope that helps -
How do I use the buffered counting mode at a fixed frequency?
Hi-
I'm using a PCI-6259 M-series board with the Nidaq MX
drivers in Labview 7. I am trying to use one counter to do
buffered edge counting (eg. count how many pulses appear on one input
in 400 successive time bins of 10 uS each following a digital start
pulse). That is, my inputs are:
Start Pulse (from experiment)
Count Pulse (from a photomultiplier tube in the experiment)
And I want to know:
# of pulses from 0 to 10 uS after the Start Pulse
# of pulses from 11 to 20 uS after the Start
Pulse (or, equally good, # of pulses from 0 to 20 uS....I can
subtract later)
# of pulses from 3991 to 4000 uS after the Start Pulse (or, # of pulses from 0 to 4000 uS...same thing)
The Count Digital Events-Buffered-Finite-Ext Clk.vi sample
appears to do half of this. I can set this up CTR0 with the Count
pulse (and possibly add the start pulse as an Arm Start....I can't use
a Start Trigger, right?). However, I need to generate a Sample
Clock Source at 100 kHz (to trigger the card to buffer the counter
value and start counting in the next bin). So, I tried to set up
CTR1 along the lines of Gen Dig Pulse Train-Finite-Dig Start.vi for
generating a finite pulse train starting on a digital trigger, and
connecting the output from CTR1 to the Sample Clock Source on
CTR0. However, I get an error -50103 saying the specified
resource is reserved if I do both at the same time. But, I can't
see any resource conflicts...the pulse generation on CTR1 works fine
alone, as well as the buffered counting on CTR0, and all the PFI pins
are different. Is there some reason I can't use both counters at
the same time?
I think I can use the FREQOUT pin on the card to generate a Sample
Clock Source at 100 kHz, since I think this is independent of CTR0
& CTR1. However, I can't trigger the FREQOUT to always start
when I get a Start Pulse (as I can if I trigger a Digital Pulse Train
to start on a digital trigger...or can I?)...so my bins will move
randomly by up to 10 uS.
This is an unrelated topic, but is there a discussion of
the relationship between the terminology in the manuals describing the
cards (SOURCE, GATE, OUTPUT terminals) and the terminology in NidaqMX
(Source Clock/SrcClk.Source, CI.CountEdges.Term, CO.Pulse.Term)?
Eg. is CTR0.GATE always the same thing as SrcClk.Source, or does it
depend on the mode of operation? If the M-series hardware manual
says to connect something to the SOURCE input, how do I assign an
alternate PFI pin to that SOURCE input in Labview? Does it depend
on the counter type, or is it always the same?Dave,
Hi, you brought up several questions / issues -- let me see if I can help with some of them:
I can set this up CTR0 with the Count pulse (and possibly add the start pulse as an Arm Start....I can't use a Start Trigger, right?).
Yes, you could set up this way. Also, as far as I know you're also correct that you need to configure for an "Arm Start" trigger using the DAQmx Trigger property node. The "Arm Start" trigger is used for counter input (measurement) apps while the regular "Start Trigger" can be used for counter output (pulse generation) tasks. I don't think I've experimented with recent versions of DAQmx though so it may have changed in 7.4 or 7.5
...I tried to set up CTR1 along the lines of Gen Dig Pulse Train-Finite-Dig Start.vi for generating a finite pulse train starting on a digital trigger, and connecting the output from CTR1 to the Sample Clock Source on CTR0. However, I get an error -50103 saying the specified resource is reserved if I do both at the same time
I highlighted the problem -- the FINITE pulse train. DAQmx uses CTR0 as a "helper" when you generate a finite pulse train on CTR1. It would generate a single pulse whose width corresponds to the exact amount of time needed for CTR1 to generate its specified # of pulses.
For your specific app, I think you could generate a triggered continuous pulse train with CTR1 -- this wouldn't need to use CTR0 as a helper. The Start Pulse would arm CTR0 at the same instant that CTR1 is started. If you set up CTR0 to acquire on the trailing edge of CTR1's pulses, then you'll get the time bins you want.
A final slight mod would be to setup CTR0 for measuring buffered periods (set units == "Ticks") instead of counting edges. In that mode, you wouldn't have to do the subtraction at the end.
This is an unrelated topic, but is there a discussion of the relationship between the terminology in the manuals describing the cards (SOURCE, GATE, OUTPUT terminals) and the terminology in NidaqMX (Source Clock/SrcClk.Source, CI.CountEdges.Term, CO.Pulse.Term)? Eg. is CTR0.GATE always the same thing as SrcClk.Source, or does it depend on the mode of operation?
There's an NI app note and some discussion forum hits if you search the site for "daqmx terminology."
If the M-series hardware manual says to connect something to the SOURCE input, how do I assign an alternate PFI pin to that SOURCE input in Labview? Does it depend on the counter type, or is it always the same?
Usually, that choice would be available under the DAQmx Channel property node. There'll be some place to define where the input signal is coming from, generally with "Term" or "Terminal" as part of its name. Sorry I can't be more specific as I'm not at my LV computer now.
Happy counting!
-Kevin P. -
How to use single buffered table with FOR ALL ENTRIES KEYWORD
Hai,
I'm Using TJ02T Database table, It is single buffered table but at the same time I want to use FOR ALL ENTRIES KEYWORD , Please Help me.
Regards,
S.JananiHi,
FOR ALL ENTRIES will not depend on the buffering nature of the table. The single buffered table will only only buffer one record into memory. You can still use the statement to query the values, but it may have performance problems if the data volume is high since the records are not completely buffered into memory, the time will spent in getting data from DB.
Thanks..
Preetham S
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