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  • Java Thread Management and Application Flow

    - by user119179
    I have a Java application that downloads information (Entities) from our server. I use a Download thread to download the data. The flow of the download process is as follows: Log in - The user entity is downloaded Based on the User Entity, download a 'Community' entities List and Display in drop down Based on Community drop down selection, Download and show 'Org Tree' in a JTree Based on Node selection, download Category entities and display in drop down Based on Category selection, download Sub Category entities and display in drop down Based on Sub Category selection download a large data set and save it The download occurs in a thread so the GUI does not 'freeze'. It also allows me to update a Progress Bar. I need help with managing this process. The main problem is when I download entity data I have to find a way to wait for the thread to finish before attempting to get the entity and move to the next step in the app flow. So far I have used a modal dialog to control flow. I start the thread, pop up a modal and then dispose of the modal when the thread is finished. The modal/thread are Observer/Observable the thread does a set changed when it is finished and the dialog disposes. Displaying a modal effectively stops the flow of the application so it can wait for the download to finish. I also tried just moving all the work flow to Observers. All relevant GUI in the process are Observers. Each update method waits for the download to finish and then calls the next piece of GUI which does its own downloading. So far I found these two methods produce code that is hard to follow. I would like to 'centralize' this work flow so other developers are not pulling out their hair when they try to follow it. My Question is: Do you have any suggestions/examples where a work flow such as this can be managed in a way that produces code that is easy to follow? I know 'easy' is a relative term and I know my both my options already work but I would like to get some ideas from other coders while I still have time to change it. Thank you very much.

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  • Upload a file with POST (multipart/form-data) using VBA

    - by Moses Ting
    Does anyone know if it's possible to upload a file via POST body (multipart/form-data) using VBA? I'm currently using the Microsoft.XMLHTTP object, but I'm not tied to it if that doesn't support multipart POST. Here's what I'm doing so far: Set oHttp = CreateObject("Microsoft.XMLHTTP") oHttp.Open "POST", theUrl, False oHttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded" oHttp.Send "body=thebody"

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  • What is the relation between database books by Ullman et al.?

    - by macias
    A First Course in Database Systems by Jeffrey D. Ullman, Jennifer Widom (Amazon links) Database System Implementation by Hector Garcia-Molina, Jeffrey D. Ullman, Jennifer D. Widom Database Systems: The Complete Book by Hector Garcia-Molina, Jeffrey D. Ullman, Jennifer Widom As far as I know the second one is the second "part" of the first one. But what about the third one -- is it just first+second published in one volume? I would like to buy them, but I don't want to get redundant reading. Thank you in advance for clarification.

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  • Convert a PDF to a Transparent PNG with GhostScript

    - by Jonathon Wolfe
    Hi all. I am attempting, unsuccessfully, to use Ghostscript to rasterize PDF files with a transparent background to PNG files with a transparent background. I've searched high and low for questions from others attempting the same thing and none of the posted solutions, which as far as I can tell come down to specifying -sDEVICE=pngalpha, have worked with my test files. At this point I would really appreciate any advice or tips a more experienced hand could provide. My test PDF is located here: http://www.kolossus.com/files/test.pdf It could be that the issue is with this file, but I doubt it. As far as I can tell, it has no specified background, and when I open the file with a transparency-aware app like Photoshop or Illustrator, sure enough it displays with a transparent background. However, when opened with an application like Adobe Reader the file is rendered with a white background. I believe that this has more to do with the application rendering the PDF than with the PDF itself -- apps like Adobe Reader assume you want to see what a printed document will look like and therefore always show a white canvas behind the artwork -- but I can't be sure. The gs command I'm using is: gs -dNOPAUSE -dBATCH -sDEVICE=pngalpha -r72 -sOutputFile=test.png test.pdf This produces a PNG that has transparent pixels outside of the bounding box of the artwork in the file, but all pixels that are inside the artwork's bounding box are rasterized against a white background. This is a problem for me, as my artwork has drop shadows and antialiased edges that need to be preserved in the final output, and can't just be postprocessed out with ImageMagick. A sample of my PNG output is at the same location as the pdf above, with .png at the end (stackoverflow won't let me include more than one url in my post). Interestingly, I see no effects from using the -dBackgroundColor flag, even if I set it to something non-white like -dBackgroundColor=16#ff0000. Perhaps my understanding of the syntax of this flag is wrong. Also interestingly, I see no effects from using the -dTextAlphaBits=4 -dGraphicsAlphaBits=4 flags to try to enable subpixel antialiasing. I would also appreciate any advice on how to enable subpixel antialiasing, especially on text. Finally, I'm using GPL Ghostscript 8.64 on Mac OS 10.5.7, and the rendering workflow I'm trying to get set up is to generate transparent PNG images from PDFs output by PrinceXML. I'm calling Ghostscript directly for the rasterization instead of using ImageMagick because ImageMagick delegates to Ghostscript for PDF rasterization and I should be able to control the rasterization better by calling GS directly. Thanks for your help. -Jon Wolfe

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  • Identifier for win64 configuration in Qmake

    - by Tuminoid
    Is there a "win64" identifier in Qmake project files? Qt Qmake advanced documentation does not mention other than unix / macx / win32. So far I've tried using: win32:message("using win32") win64:message("using win64") amd64:message("using amd64") The result is always "using win32". Must I use a separate project-file for x32 and x64 projects, so they would compile against correct libraries? Is there any other way to identify between 32-bit and 64-bit environments?

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  • Hide an access violation on another application

    - by Fernando
    Hi, I have an application that sometimes causes an access violation on exit. This is quite unpredictable and all attempts to locate the bug have been unsuccesful so far. The bug is harmless, as no data is lost, so I was thinking if it might be possible to just hide it. Is it possible to have another app launch the buggy one and catch the Access Violation exception if it occurs? If yes, how? Thanks in advance!

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  • collaborative filtering in rails

    - by holden
    I'm looking for a solution for collaborative filtering in rails or even possible examples. So far I have only found acts_as_recommendable which looks useful but I noticed it hasn't had any updates in the last 2 years. Does anyone know of any other solutions and/or examples?

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  • Best php qa tools

    - by Alexandre Victoor
    Hello, I am looking for qa tools for php. I am used to pmd, findbugs and checkstyle in the java world. Do you know some similar tools for php doing code analysis ? So far I have found but not tested yet : phplint pmd's cpd module PHP_CodeSniffer Thanks in advance for your help

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  • Uiwebview refreshes after zoom and pinch

    - by Dominik
    Hello, I have a uiwebview in my App. So far everything works fine, but when i zoom in or out for example the uiwebview refreshes the loaded page and then scrolls and zooms to the new page location and size. So the zooming works good, but I don't want the user to see the refresh and repositioning of the website. Is there a way to prevent this? Thanks for any tips!

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  • help with making a password checker in java

    - by Cheesegraterr
    Hello, I am trying to make a program in Java that checks for three specific inputs. It has to be 1. At least 7 characters. 2. Contain both upper and lower case alphabetic characters. 3. Contain at least 1 digit. So far I have been able to make it check if there is 7 characters, but I am having trouble with the last two. What should I put in my loop as an if statement to check for digits and make it upper and lower case. Any help would be greatly appreciated. Here is what I have so far. import java.awt.*; import java.io.*; import java.util.StringTokenizer; public class passCheck { private static String getStrSys () { String myInput = null; //Store the String that is read in from the command line BufferedReader mySystem; //Buffer to store the input mySystem = new BufferedReader (new InputStreamReader (System.in)); //creates a connection to system input try { myInput = mySystem.readLine (); //reads in data from the console myInput = myInput.trim (); } catch (IOException e) //check { System.out.println ("IOException: " + e); return ""; } return myInput; //return the integer to the main program } //**************************************** //main instructions go here //**************************************** static public void main (String[] args) { String pass; //the words the user inputs String temp = ""; //holds temp info int stringLength; //length of string boolean goodPass = false; System.out.print ("Please enter a password: "); //ask for words pass = getStrSys (); //get words from system temp = pass.toLowerCase (); stringLength = pass.length (); //find length of eveyrthing while (goodPass == false) { if (stringLength < 7) { System.out.println ("Your password must consist of at least 7 characters"); System.out.print ("Please enter a password: "); //ask for words pass = getStrSys (); stringLength = pass.length (); goodPass = false; } else if (something to check for digits) { } }

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  • nokogiri xml unescape

    - by user296507
    hi, i'm just trying out nokogiri xml builder, but am having some problem tying to unescape the content. have been spending a bit of time googgling but so far can't find the answer. any help would be greatly appreciated. #build xml docoument builder = Nokogiri::XML::Builder.new do |xml| xml.root{ xml.node { xml.value "text1 & text2" } } end puts builder.to_xml output i'm get is "text1 &amp text2" but i want it to be "text1 & text2"

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  • Why do .NET winforms scale improperly at large DPI settings?

    - by Alex
    My .NET application (VB.NET 3.5 if you really must know) forms do not properly format when rendered at high DPI settings. All of the fixes I've found so far simply explain the cause of the problem as "certain UI elements do not scale properly". I was wondering if anyone had a more meaningful explanation? Thanks!

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  • Can a custom WPF control implement the IsDefault property

    - by jpierson
    I have a custom button control that does not derive from Button. Is it possible for me to implement the equivalent of IsDefault so that the command associated with my control will be invoked. I was hoping that this was an attached property that I could add to any control but as far as I can tell it doesn't seem to be. Am I out of luck if my control does not derive from Button or is there at least a reasonable workaround?

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  • Is the board game "Go" NP complete?

    - by sharkin
    There are plenty of Chess AI's around, and evidently some are good enough to beat some of the world's greatest players. I've heard that many attempts have been made to write successful AI's for the board game Go, but so far nothing has been conceived beyond average amateur level. Could it be that the task of mathematically calculating the optimal move at any given time in Go is an NP-complete problem?

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  • Advice on logic circuits and serial communications

    - by Spencer Ruport
    As far as I understand the serial port so far, transferring data is done over pin 3. As shown here: There are two things that make me uncomfortable about this. The first is that it seems to imply that the two connected devices agree on a signal speed and the second is that even if they are configured to run at the same speed you run into possible synchronization issues... right? Such things can be handled I suppose but it seems like there must be a simpler method. What seems like a better approach to me would be to have one of the serial port pins send a pulse that indicates that the next bit is ready to be stored. So if we're hooking these pins up to a shift register we basically have: (some pulse pin)-clk, tx-d Is this a common practice? Is there some reason not to do this? EDIT Mike shouldn't have deleted his answer. This I2C (2 pin serial) approach seems fairly close to what I did. The serial port doesn't have a clock you're right nobugz but that's basically what I've done. See here: private void SendBytes(byte[] data) { int baudRate = 0; int byteToSend = 0; int bitToSend = 0; byte bitmask = 0; byte[] trigger = new byte[1]; trigger[0] = 0; SerialPort p; try { p = new SerialPort(cmbPorts.Text); } catch { return; } if (!int.TryParse(txtBaudRate.Text, out baudRate)) return; if (baudRate < 100) return; p.BaudRate = baudRate; for (int index = 0; index < data.Length * 8; index++) { byteToSend = (int)(index / 8); bitToSend = index - (byteToSend * 8); bitmask = (byte)System.Math.Pow(2, bitToSend); p.Open(); p.Parity = Parity.Space; p.RtsEnable = (byte)(data[byteToSend] & bitmask) > 0; s = p.BaseStream; s.WriteByte(trigger[0]); p.Close(); } } Before anyone tells me how ugly this is or how I'm destroying my transfer speeds my quick answer is I don't care about that. My point is this seems much much simpler than the method you described in your answer nobugz. And it wouldn't be as ugly if the .Net SerialPort class gave me more control over the pin signals. Are there other serial port APIs that do?

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  • Icons on CMFCOutlookBar

    - by steve-weeks
    I'm using CMFCOutlookBar from the Feature Pack, and I'm trying to put an icon on the "button" of the tabbed pane - the thing that slides up and down in the bar, when you select a pane. The pane API includes a "SetIcon" function, but this doesn't do anything as far as I can tell. Neither does the "SetTabHicon" function of the bar. Does anyone know how to do this?

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  • Jquery simple photo manager demo - recycle trash completely

    - by Roman
    Hi, I'm using the Jquery's simple photo manager just as it is and it's working properly. http://jqueryui.com/demos/droppable/photo-manager.html All I need is the possibility to recycle all the elements from the trash by a single click. Sounds simple but I couldn't get it so far. Ok, I'm a newbie to Jquery. Help would be appreciated!

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  • Easiest way to implement RSS reader on Google Android?

    - by user291888
    Hi guys, This is my first time on stack overflow, so I apologize if this question has been asked before, but is there an easy way to implement an RSS reader on the Google Android (API 1.5)? I'm searched far and wide with the code sources I know of, and I've only found one implementation which takes 6 different classes and doesn't seem to compile on the current Android SDK's. If I end up having to write my own, I'll be sure to post it here later on. Thanks a lot.

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  • aspNetCompatibility WCF and WinForm

    - by user190084
    I would like to use Windows Forms with a WCF service and leverage the pre-built authentication of asp.net by using aspNetCompatibilityEnabled = true in the WCF service. Is there any module or pre-built assemblies that can add ASP.NET functionality to a Windows Forms application? As far as I understand, this functionality isn't built into Windows Forms and can't be leveraged.

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  • clear view of box model

    - by Abhimanyu
    As far as i know every element in HTML associated with padding(left, right, top, bottom) , margin(left, right, top, bottom) which will create the box model for that so that we can figure it out its actual position with respect to document. any idea over it?

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  • Global Thermonuclear War [closed]

    - by Vivin Paliath
    Hey there, I'm Dr. Falken and I'm trying to make a computer program on my computer (WOPR) that simulates Global Thermonuclear War. So far I've simulated Checkers and Tic-Tac-Toe, but I've never tried to do anything on this scale. Any pointers on how I should start? Sincerely, Dr. Falken

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  • Rails deployment from a windows machine

    - by Kenji Crosland
    I'm a rails novice and just finished my first rails app(as far as I can tell). Now I'm at the deployment stage and find myself utterly confused--especially because I'm deploying from a windows machine. I bought the pragmatic book on deployment and it seems a little out of date since they're recommending subversion instead of Git. What would be the easiest deployment method these days for someone doomed to use windows? Are there any good up-to-date tutorials on deployment from Windows?

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