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  • How to implement async pattern in windows forms application?

    - by Alkersan
    I'm using an MVC pattern in winforms application. I need to call remote service asynchronously. So On some event in View I invoke corresponding Presenter method. In Presenter I call BeginInvoke method of service. But to View must be updated only in Main Thread. I could actualy point CallBack to some function in View, and update it`s controls state, but this conflicts with MVP pattern - View must not be responsible for data it carries. This callback function must be in Presenter. But how then invoke View in Main Thread?

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  • Should I use a modified singleton design pattern that only allows one reference to its instance?

    - by Graham
    Hi, I have a class that would normally just generate factory objects, however this class should only used once throughout the program in once specifix place. What is the best design pattern to use in this instance? I throught that having a modified singleton design which only allows one reference to instance throughout the program would be the correct way to go. So only the first call to getInstance() returns the factory library. Is this a good or bad idea? Have I missed out another fundermental design pattern for solving this problem? Thanks for your help.

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  • does anyone see any issues with this thread pattern?

    - by prmatta
    Here is a simple thread pattern that I use when writing a class that needs just one thread, and needs to a specific task. The usual requirements for such a class are that it should be startable, stopable and restartable. Does anyone see any issues with this pattern that I use? public class MyThread implements Runnable { private boolean _exit = false; private Thread _thread = null; public void start () { if (_thread == null) { _thread = new Thread(this, "MyThread"); _thread.start(); } } public void run () { while (_exit) { //do something } } public void stop () { _exit = true; if (_thread != null) { _thread.interrupt(); _thread = null; } } } I am looking for comments around if I am missing something, or if there is a better way to write this.

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  • What is the most underused or underappreciated design pattern?

    - by Rob Packwood
    I have been reading a lot on design patterns lately and some of them can make our lives much easier and some of them seem to just complicate things (at least to me they do). I am curious to know what design patterns everyone sees as underunsed or underappreciated. Some patterns are simple and many people do not even realize they are using a pattern (decorator probably being the most used, without realized). My goal from this is to give us pattern-newbies some appreciation for some of the more complex or unknown patterns and why we should use them.

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  • Best neural network for certain type of pattern analysis?

    - by fred basset
    Hi All, I'm working on a system that will send telemetry data on machine operation back to a central server for analysis. One of the machine parameters we're measuring is motor current drawn vs time. After an operation is finished we plan to send back an array of currents vs time to the server. A successful operation would have a pattern like a trapezoid, problematic operations would have a pattern completely different, more like a large spike in values. Can anyone recommend a type of neural network that would be good at classifying these 1D vectors of current values into a pass/fail type output? Thanks, Fred

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  • How do I correct a directory incorrectly copied into itself?

    - by Peter Boughton
    Given the following situation... <path>/mydir1/mydir2 ...where mydir2 should have overwritten mydir1, but was instead placed inside, and both directories actually have the same filename. How is that fixed? Attempting to do mv <path>/mydir/mydir/* <path>/mydir/ or mv <path>/mydir <path>/ results in: mv: cannot move `<path>/mydir/mydir` to a subdirectory of itself, `<path>/mydir` This seems stupidly simple, but it's late here and I can't figure it out. There are seventeen such directories to fix (path differs for each, but same mydir name). To confirm, the error message can be caused with this: # cd /path/to/directory # mv mydir/mydir ./ mv: cannot move `mydir/mydir' to a subdirectory of itself, `./mydir' Also tried: # mv mydir/mydir/* mydir/ mv: cannot move `mydir/mydir/otherdir1' to a subdirectory of itself, `mydir/otherdir1' mv: cannot move `mydir/mydir/otherdir2' to a subdirectory of itself, `mydir/otherdir2' and... # mv /path/to/directory/mydir/mydir/otherdir1 /path/to/directory/mydir/ mv: cannot move `/path/to/directory/mydir/mydir/otherdir1' to a subdirectory of itself, `/path/to/directory/mydir/otherdir1' and using a temporary directory: # mv mydir/mydir ./mydir-temp # mv mydir-temp/* mydir/ mv: cannot move `mydir-temp/otherdir1' to a subdirectory of itself, `mydir/otherdir1' mv: cannot move `mydir-temp/otherdir2' to a subdirectory of itself, `mydir/otherdir2' I found a similar question "How to recursively move all files (including hidden) in a subfolder into a parent folder in *nix?" which suggested that mv bar/{,.}* . would do this. But this also gives the same errors, as well as confusingly picking up . and .. from somewhere. # cd mydir # mv mydir/{,.}* . mv: cannot move `mydir/otherdir1' to a subdirectory of itself, `./otherdir1' mv: cannot move `mydir/otherdir2' to a subdirectory of itself, `./otherdir2' mv: cannot move `mydir/.' to `./.': Device or resource busy mv: cannot move `mydir/..' to `./..': Device or resource busy mv: overwrite `./.file'? y Another similar question "linux mv command weirdness" suggests that mv doesn't overwrite and a copy is required. # cd mydir # cp -rf ./mydir/* ./ cp: overwrite `./otherdir1/file1'? y cp: overwrite `./otherdir1/file2'? y cp: overwrite `./otherdir1/file3'? This appears to be working... except there's a lot of files (and dirs) - I don't want to confirm every one! Isn't the f there supposed to prevent this? Ok, so cp was aliased to cp -i (which I found out with type cp), and bypassed by using \cp -rf ./mydir/* ./ which seems to have worked. Although I've solved the problem of getting dirs/files from one place to another, I'm still curious as to what's going on with the mv stuff - is this really a deliberate feature as suggested by Warner?

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  • How to get fully qualified path of css file?

    - by Malcolm
    Hi, In ASP.NET MVC how do I get the fully qualified path to my css file by specifying the relative path. Eg Url.Content("~/Content/Print.css") This returns eg "/Content/Print.css" Where as I want http://www.mysite.com/Content/Printcss Understand the issue? Malcolm

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  • How do i change the start in path of a shortcut for nsis?

    - by Lodle
    I have an nsis installer script for the application im working on and it can place a shortcut on the desktop and in the start menu folder but each shortcut has the wrong start in path and as such the app saves data files to where the short cut is. Is there an easy way to change the start in path as the documentation was less than helpful on the matter? Section "Desktop Shortcut" SHORTCUT SetOutPath "$DESKTOP" CreateShortcut "${FULL_APP_NAME}.lnk" "$INSTDIR\${APP_NAME}.exe" "" "$ICONDIR\${DESKICO}" SectionEnd

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  • how to get phyiscal path of windows service using .net?

    - by Krishna
    I have to get the absolute path of a windows service in a .Net Admin application. I am using ServiceController of .Net as shown below. ServiceController serviceController = new ServiceController(serviceName); But I don't see any property here to get the absolute path of the .exe of the service. Is there anyway to get this programmatically.

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  • Do I use a regular expression on this file path?

    - by uno
    I have to strip a file path and get the parent folder. Say my path is \\ServerA\FolderA\FolderB\File.jpg I need to get File Name = File.jog Folder it resides in = FolderB And parent folder = FolderA I always have to go 2 levels up from where the file resides. Is there an easier way or is a regular expression the way to go?

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  • RVM: how can I dynamically export gem executable directory in my path?

    - by tommasop
    I installed rvm as root to setup an Ubuntu LTS 8.04 as a web hosting server for my rails apps. rvm is installed in: /usr/local/rvm Everything works fine, gems installation included and users are able to use ruby and gem commands. sudo gem install rails My problem is that the gems EXECUTABLE DIRECTORY is not included in my PATH and thus I cannot use rails command. Is there a way to dynamycally include gems executable directory in my PATH? Can it be done directly through rvm?

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  • How to make disconnected closed curves connected by adding a shortest path using MATLAB?

    - by user198729
    bwlabel can be used to get disconnected objects in an image: [L Ne] = bwlabel(image); I want to make the objects(But my target is only the contours(closed curve) of these objects) connected by adding a shortest path where necessary. How do I approach this? UPDATE Or how to dilate the closed curves so that they get connected? How to calculate the shortest path between two disconnected closed curves?

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  • How to specify a path to store file in Blackberry JDE?

    - by Kumar
    Dear Friends, Can anyone tell me how to store a file in a blackberry simulator.Actually i m using blackberry jde4.6.I created one simple application in that application i created one edit field and one button if we click the button then the content in the file should store as file i don't how to set a path.If u have any idea how to set path to store data please explain. regards, s.kumaran.

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