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  • Choosing approach for an IM client-server app

    - by John
    Update: totally re-wrote this to be more succint. I'm looking at a new application, one part of which will be very similar to standard IM clients, i.e text chat, ability to send attachments, maybe some real-time interaction like a multi-user whiteboard. It will be client-server, i.e all traffic goes through my central server. That means if I want to support cross-communication with other IM systems, I am still free to pick any protocol for my own client<--server communication - my server can use XMPP or whatever to talk to other systems. Clients are expected to include desktop apps, but probably also browser-based as well either through Flex/Silverlight or HTML/AJAX. I see 3 options for my own client-server communication layer: XMPP. The benefits are clients already exist as do open-source servers. However it requires the most up-front research/learning and also appears like it might raise legal issues due to GPL. Custom sockets. A server app makes connections with the clients, allowing any text/binary data to be sent very fast. However this approach requires building said server from scratch, and also makes a JS client tricky Servlets (or similar web server). Using tried and tested Java web-stack, clients send HTTP requests similar to AJAX-based websites. The benefit is the server is easy to write using well-established technologies, and easy to talk to. But what restrictions would this bring? Is it appropriate technology for real-time communication? Advice and suggests are welcome, especially what pros and cons surround using a web-server approach as compared to a socket-based approach.

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  • I wired up a z 80 using telephone wire and put a jump to 0000 0000 0000 0000

    - by john
    I put 1100 0011 0000 0000 0000 0000 in the 2764 eprom --- this is supposed to test the z80 -- I have a 555 timer running at 500 khz. Can this small program work with the z80 ? I looked at the address pins on a m465 oscilloscope. The address shows highs up to 0100 0000. I think it should only count to 0000 0000 0000 0011. Can the z80 be tested? The Santa Clara Valley also made the lm1871 radio control chip that could not show a high or a low without completing the entire rc loop.

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  • Which CSS identifier is used for the selected tab in tabbed tables in browsers other than IE?

    - by David Navarre
    When you have a table on a form in Notes, you can choose to display only one row at a time (via the Special Table Row Display parameter on the Table Rows tab of the Table properties). In a Notes document displayed using Internet Explorer that contains such a table, a row is displayed with a cell for each "tab". The TD that serves as the tab for the selected "Notes table row" is assigned <td class="dominoSelTopTab">, while the other tabs get <td class="dominoTopTab">. However, when using other browsers, it's not nearly as simple. In Firefox, each "tab" ends up as a single-celled-single-row-table within the table with very little to identify it. <td><table border="1" cellpadding="2"> <tr><td><div align="center"><b>Tab 2</b></div></td></tr> </table></td> A non-selected tab would show as follows: <td><table border="1" cellpadding="2"> <tr><td><div align="center"><a name="1." href="/Projects/MyCSS.nsf/0c3b9489476440c085257a62006d97d6/d482a1767a4af77f85257a62006db064?OpenDocument&amp;TableRow=1.0#1." target="_self">Tab 1</a></div></td></tr> </table></td> So, the question is, how do I identify the selected tabs and the non-selected tabs when not using IE? Note: For those who are not Notes developers, the HTML is auto-generated from the visual design as laid out in the Notes designer client. I would replace it all with manual HTML, except there is so much of it that doing so would consume far too much time.

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  • whats wrong with this piece of code for saving contacts

    - by Shadow
    Hi, i am using the latest Nokia Qt SDK. i have tried to add the contacts, its not getting added.. what is missing here.. // Construct contact manager for default contact backend QContactManager* cm = new QContactManager("simulator"); // QContactManager* cm = new QContactManager("memory"); // i tried this, its also not working // Create example contact QContact example; // Add contact name QContactName name; name.setFirstName("John"); name.setLastName("Doe"); example.saveDetail(&name); // Add contact email address //QContactEmailAddress email; // email.setContexts(QContactDetail::ContextHome); //email.setEmailAddress(“[email protected]”); // example.saveDetail(&email); // Finally, save the contact details cm->saveContact(&example); delete cm; Thanks

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  • Is developing iPhone apps in any language other than Objective-C ever a truly viable solution?

    - by David Foster
    I hear all this stuff about crazy ways to build iPhone apps using Ruby or C# under .NET or the like. Even stuff about developing apps on Windows using Java, or auto-generated apps using Flash CS5 or something. Now, I've never really spent any time at all investigating these claims—I just brushed them off as clumsy or cumbersome or down-right claptrap—but I'm a proud Objective-C programmer who's perhaps a little worried as to whether there's any truth in all of this?

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  • What is on the 68000 stack when classic MacOS enters a program?

    - by John Källén
    I'm trying to understand an old classic Mac application's entry point. I've disassembled the first CODE resource (not CODE#0, which is the jump table). The code refers to some variables off the stack: a word at 0004(A7), an array of long words of starting at 000C(A7) whose length is the value at 0004(A7), and a final long word beyond that array that seems to be a pointer to a character string. The array of long words looks like strings at first glance, so it looks superficially like we're dealing with an (int argc, char ** argv) situation, except the "argv" array is inline in the stack frame. What should a program be expecting on its stack / registers when it first gets called by the Mac OS?

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  • C++ - Print Out Objects From Set

    - by John Smith
    If I have a C++ set, declaration set personList; with iterator, set::const_iterator location; how can I print out the contents of the set? They are all person objects, and I have overridden the operator<< for Person. The line that errors is: cout << location and it's in a basic for loop. Netbeans gives the following error: proj.cpp:78: error: no match for ‘operator<<’ in ‘std::cout << location’ so it looks like it wants an override for the iterator's <<. Basically, I am taking objects that used to be stored in an array format, but are now in a set. What is the equivalent to cout << array[i] for sets?

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  • Insert a default row into a combobox that is bound to a datatable?

    - by John M
    On a winform there is a combobox that derives its information from a datatable. The datatable draws from a database list. this.cboList.DataSource = pullData(); this.cboList.DisplayMember = "fieldA"; Once the DataSource is set I am not able to insert a default row (ie *) as the first item in the combobox. I tried this: this.cboList.Items.Insert(0,"*"); Is there a way to insert in the combobox after the datasource is set or should this be done in the datatable?

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  • Why does my git push hang after successfully pushing?

    - by John
    On a newly set up ssh git repo, whenever I push, I get normal output like this: ? git push Counting objects: 15, done. Delta compression using up to 4 threads. Compressing objects: 100% (9/9), done. Writing objects: 100% (9/9), 989 bytes, done. Total 9 (delta 7), reused 0 (delta 0) It happens very quickly, and the changes are immediately available on the server repo. But the output hangs there for about a minute, and then finishes with: To [email protected]:baz.git c8c391c..1de5e80 branch_name -> branch_name If I control-c before it finishes, everything seems to continue to be normal and healthy, locally and remotely. What is it doing while hanging? Is something configured incorrectly on the server side?

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  • Do most web 'programmers' (not designers) use WYSIWYG editors or hand code their HTML?

    - by John MacIntyre
    When I started programming web pages, it became immediately obvious that the WYSIWYG editors sucked. The HTML output was difficult to maintain, did things in ways you may not have agreed with, completely messed up existing pages if opened, couldn't handle code in the page, and was polluted with dead or irrelevant code like <font ...></font>. At that time, I didn't know a single programmer with more than 6 months experience who didn't hand code their HTML. Even now, most of the developers I know hand code their HTML. But, I also realize this was a decade ago, WYSIWYG editors have improved, and I may be seriously underproductive hand coding my HTML. Do you, as a web programmer, use WYSIWYG editors for your HTML? PS-I'm kind of thinking we can just vote either YES or NO, and put comments below.

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  • String padding for a text template

    - by ndee
    I'm creating a PDF file from a txt-template with tcpdf ([Example 8][1]). The txt-template looks like this: SALUTATION FIRSTNAME LASTNAME STREET CURRENTDATE SOMEMOREINFORMATION MYWEBSITE I replace those markers with the correct value. So that it would look like this: Mr. John Doe Downingstreet 10 14th May, 2010 [email protected] www.stackoverflow.com In this example, when I replace the values, the indention of the date is dependent on the length of the street name (which I don't want). I could solve this issue with str_pad but the problem is, I normally use three columns and there are lines which only have content in col1 and col3 as in the last line. How can I solve that problem? Is there something like the "overwrite" function in Word, that when you write, the text just gets overwritten? Thanks in advance.

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  • How to enforce a 5-minute per post rule in a session object in Java?

    - by John
    I'm trying to figure out how to enforce a 5 minute per post/action rule. I'm developing a web application with Wicket in Java and I've got a session class which I was planning on using to keep track of these timers on a per-user basis. I wasn't planning on storing the timestamp in a database. public boolean isAllowedToPost() { if(null OR has 5 minutes passed since last post) { // set the new timestamp return true; } else { return false; } }

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  • SQL: count days in date range?

    - by John Isaacks
    I have a query like this: SELECT COUNT(*) AS amount FROM daily_individual_tracking WHERE sales = 'YES' AND daily_individual_tracking_date BETWEEN '2010-01-01' AND '2010-03-31' I am selected from a date range. Is there a way to also get the total days in the date range?

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  • How do I access abstract private data from derived class without friend or 'getter' functions in C++?

    - by John
    So, I am caught up in a dilemma right now. How am I suppose to access a pure abstract base class private member variable from a derived class? I have heard from a friend that it is possible to access it through the base constructor, but he didn't explain. How is it possible? There are some inherited classes from base class. Is there any way to gain access to the private variables ? class Base_button { private: bool is_vis; Rect rButton; public: // Constructors Base_button(); Base_button( const Point &corner, double height, double width ); // Destructor virtual ~ Base_button(); // Accessors virtual void draw() const = 0; bool clicked( const Point &click ) const; bool is_visible() const; // Mutators virtual void show(); virtual void hide(); void move( const Point &loc ); }; class Button : public Base_button { private: Message mButton; public: // Constructors Button(); Button( const Point &corner, const string &label ); // Acessors virtual void draw() const; // Mutators virtual void show(); virtual void hide(); }; I want to be able access Rect and bool in the base class from the subclass

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  • Winforms - How to allow user to increase font size of listview with hidden controls?

    - by John M
    I am creating an winform application that will run on a tablet PC. One form for this app will have a listview control. I would like to allow the user to change the font size based on preference (ie did they remember their glasses today). A few ways that I can think of would be a numeric-up-down or +/- button controls. Both of these ways require screen real estate that is very limited. Is there a control or technique that would allow font size changes with a hidden-when-not-used control?

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  • Java - StackOverflow Error on recursive 2D boolean array method that shouldn't happen.

    - by David W.
    Hey everyone, I'm working on a runnable java applet that has a fill feature much like the fill method in drawing programs such as Microsoft Paint. This is how my filling method works: 1.) The applet gets the color that the user clicked on using .getRGB 2.) The applet creates a 2D boolean array of all the pixels in the window, with the value "true" if that pixel is the same color as the color clicked on or "false" if not. The point of this step is to keep the .getRGB method out of the recursive method to hopefully prevent this error. 3.) The applet recursively searches the 2D array of booleans where the user clicked, recording each adjacent point that is "true" in an ArrayList. The method then changes each point it records to false and continues. 4.) The applet paints every point stored in the ArrayList to a user selected color. All of the above steps work PERFECTLY if the user clicks within a small area, where only a few thousand pixels or so have their color changed. If the user selects a large area however (such as about 360,000 / the size of the applet window), the applet gets to the recursive stage and then outputs this error: Exception in thread "AWT-EventQueue-1" java.lang.StackOverflowError at java.util.ArrayList.add(ArrayList.java:351) at paint.recursiveSearch(paint.java:185) at paint.recursiveSearch(paint.java:190) at paint.recursiveSearch(paint.java:190) at paint.recursiveSearch(paint.java:190) at paint.recursiveSearch(paint.java:190) at paint.recursiveSearch(paint.java:190) at paint.recursiveSearch(paint.java:190) (continues for a few pages) Here is my recursive code: public void recursiveSearch(boolean [][] list, Point p){ if(isValid(p)){ if(list[(int)p.y][(int)p.x]){ fillPoints.add(p); list[(int)p.y][(int)p.x] = false; recursiveSearch(list, new Point(p.x-1,p.y));//Checks to the left recursiveSearch(list, new Point(p.x,p.y-1));//Checks above recursiveSearch(list, new Point(p.x+1,p.y));//Checks to the right recursiveSearch(list, new Point(p.x,p.y+1));//Checks below } } } Is there any way I can work around an error like this? I know that the loop will never go on forever, it just could take a lot of time. Thanks in advance.

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  • Split a string by two characters

    - by David
    Hi, Firstable i want to match if a string has the following format: $abc #xyz or $abc .xyz. The abc and xyz mean only alphanumeric string. If it's matched then i need to extract the first $abc and the last #xyz, all that using pure javascript and maybe regex. The pattern is in the following order: Dollar Sign Unlimited alphanumeric string space a hash or point Unlimited alphanumeric string Thanks in advance for any help.

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  • Restricting access to a subdirectory on linux

    - by David
    I'm looking for a way to make a directory accessible only to its parent directories. That is, suppose you have two directories, A and B, at the same level in the file hierarchy. Now suppose that you have a directory A' which is a subdirectory of A. I'd like to enforce that A is able to access the contents of A' but B is not.

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  • mod_rewrite htaccess redirect on specific request

    - by John
    is there a way to make mod_rewrite redirect all urls contain the following request: ?do=page&f=* to a specific page? for example: http://example.com/index.php?do=page&f=2 http://example.com/index2.php?do=page&f=4 http://example.com/page.php?do=page&f=22 to: http://example.com/custom.php

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