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• Using MSADO15.DLL and C++ with MinGW/GCC on Windows Vista

  - by Eugen Mihailescu

  INTRODUCTION Hi, I am very new to C++, is my 1st statement. I have started initially with VC++ 2008 Express, I've notice that GCC becomes kind of standard so I am trying to make the right steps event from the beginning. I have written a piece of code that connects to MSSQL Server via ADO, on VC++ it's working like a charm by importing MSADO15.dll: #import "msado15.dll" no_namespace rename("EOF", "EndOfFile") Because I am going to move from VC++ I was looking for an alternative (eventually multi-platform) IDE, so I stick (for this time) with Code::Block (I'm using last nightly buil, SVN 6181). As compiler I choose to use GCC 3.4.5 (ported via MinGW 5.1.6), under Vista. I was trying to compile a simple "hello world" application with GCC that use/import the same msado15.dll (#import "c:\Program Files\Common Files\System\ADO\msado15.dll" no_namespace rename("EOF", "EndOfFile")) and I was surprised to see a lot of compile-time errors. I was expected that the #import compiler's directive will generate a library from "msado15.dll" so it can link to it later (link-edit time or whatever). Instead it was trying to read it as a normal file (like a header file,if you like) because it was trying to interprete each line in the DLL (which has a MZ signature): Example: Compiling: main.cpp E:\MyPath\main.cpp:2:64: warning: extra tokens at end of #import directive In file included from E:\MyPath\main.cpp:2: c:\Program Files\Common Files\System\ADO\msado15.dll:1: error: stray '\144' in program In file included from E:\MyPath\main.cpp:2: c:\Program Files\Common Files\System\ADO\msado15.dll:1:4: warning: null character(s) ignored c:\Program Files\Common Files\System\ADO\msado15.dll:1: error: stray '\3' in program c:\Program Files\Common Files\System\ADO\msado15.dll:1:6: warning: null character(s) ignored c:\Program Files\Common Files\System\ADO\msado15.dll:1: error: stray '\4' in program ... and so on. MY QUESTION Well, it is obvious that under this version of GCC the #import directive does not do the expected job (perhaps #import is not supported anymore by GCC), so finally my question: how to use the ADO to access MSSQL database on a C++ program compiled with GCC (v3.4.5)?

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• jQuery to populate array-named form fields based on first entered value where number of fields is un

  - by da5id

  Greetings, I have a form with a variable number of inputs, a simplified version of which looks like this: <form> <label for="same">all the same as first?</label> <input id="same" name="same" type="checkbox" /> <input type="text" id="foo[1]" name="foo[1]" value="" /> <input type="text" id="foo[2]" name="foo[2]" value="" /> <input type="text" id="foo[3]" name="foo[3]" value="" /> <input type="text" id="foo[4]" name="foo[4]" value="" /> <input type="text" id="foo[5]" name="foo[5]" value="" /> </form> The idea is to tick the #same checkbox and have jQuery copy the value from #foo[1] into #foo[2], #foo[3], etc. They also need to clear if #same is unchecked. There can be any number of #foo inputs, based upon input from a previous stage of the form, and this bit is giving me trouble. I'm sure I'm missing something obvious, but I can't get any variation on $('#dest').val($('#source').val()); to work. Help!

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• What is the proper query to get all the children in a tree?

  - by Nathan Adams

  Lets say I have the following MySQL structure: CREATE TABLE `domains` ( `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT, `domain` CHAR(50) NOT NULL, `parent` INT(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=MYISAM AUTO_INCREMENT=10 DEFAULT CHARSET=latin1 insert into `domains`(`id`,`domain`,`parent`) values (1,'.com',0); insert into `domains`(`id`,`domain`,`parent`) values (2,'example.com',1); insert into `domains`(`id`,`domain`,`parent`) values (3,'sub1.example.com',2); insert into `domains`(`id`,`domain`,`parent`) values (4,'sub2.example.com',2); insert into `domains`(`id`,`domain`,`parent`) values (5,'s1.sub1.example.com',3); insert into `domains`(`id`,`domain`,`parent`) values (6,'s2.sub1.example.com',3); insert into `domains`(`id`,`domain`,`parent`) values (7,'sx1.s1.sub1.example.com',5); insert into `domains`(`id`,`domain`,`parent`) values (8,'sx2.s2.sub1.example.com',6); insert into `domains`(`id`,`domain`,`parent`) values (9,'x.sub2.example.com',4); In my mind that is enough to emulate a simple tree structure: .com | example / \ sub1 sub2 ect My problem is that give sub1.example.com I want to know all the children of sub1.example.com without using multiple queries in my code. I have tried joining the table to itself and tried to use subqueries, I can't think of anything that will reveal all the children. At work we are using MPTT to keep in hierarchal order a list of domains/subdomains however, I feel that there is an easier way to do it. I did some digging and someone did something similar but they required the use of a function in MySQL. I don't think for something simple like this we would need a whole function. Maybe I am just dumb and not seeing some sort of obvious solution. Also, feel free to alter the structure.

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• MATLAB intersection of 2 surfaces

  - by caglarozdag

  Hi everyone, I consider myself a beginner in MATLAB so bear with me if the answer to my question is an obvious one. Phi=0:pi/100:2*pi; Theta=0:pi/100:2*pi; [PHI,THETA]=meshgrid(Phi,Theta); R=(1 + cos(PHI).*cos(PHI)).*(1 + cos(THETA).*cos(THETA)); [X,Y,Z]=sph2cart(THETA,PHI,R); surf(X,Y,Z); %display hold on; x1=-4:.1:4; [X1,Y1] = meshgrid(x1); a=1.8; b=0; c=3; d=0; Z1=(d- a * X1 - b * Y1)/c; shading flat; surf(X1,Y1,Z1); I have written this code which plots a 3d cartesian plot of a plane intersecting a peanut shaped object at an angle. I need to get the intersection of these on 2D (going to be the outline of a peanut, but a bit skewed since the intersection happens at an angle), but don't know how. Thanks

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• .NET Process.Kill() in a safe way

  - by Orborde

  I'm controlling a creaky old FORTRAN simulator from a VB.NET GUI, using redirected I/O to communicate with the simulator executable. The GUI pops up a "status" window with a progress bar, estimated time, and a "STOP" button (Button_Stop). Now, I want the Button_Stop to terminate the simulator process immediately. The obvious way to do this is to call Kill() on the Child Process object. This gives an exception if it's done after the process has exited, but I can test whether the process is exited before trying to kill it, right? OK, so I do the following when the button is clicked: If Not Child.HasExited Then Child.Kill() Button_Stop.Enabled = False End If However, what if the process happens to exit between the test and the call to Kill()? In that case, I get an exception. The next thing to occur to me was that I can do Button_Stop.Enabled = False in the Process.Exited event handler, and thus prevent the Child.Kill() call in the Button_Stop.Clicked handler. But since the Process.Exited handler is called on a different thread, that still leaves the following possible interleaving: Child process exits. Process.Exited fires, calls Invoke to schedule the Button_Stop.Enabled = False User clicks on Button_Stop, triggering Child.Kill() Button_Stop.Enabled = False actually happens. An exception would then be thrown on step 3. How do I kill the process without any race conditions? Am I thinking about this entirely wrong?

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• Selenium RC test - IE gives 403 error on Tomcat app, Tomcat root OK

  - by Ed Daniel

  I'm new to Selenium RC, having previously used Selenium IDE and only run tests in Firefox. I'm trying to get a basic test to run using Selenium RC through Eclipse; my test works OK in Firefox, and in Safari now that I've killed the pop-up blocker, but IE8 is causing a SeleniumException to be thrown, containing an "XHR ERROR" with a 403 response: com.thoughtworks.selenium.SeleniumException: XHR ERROR: URL = http://localhost:8080/pims Response_Code = 403 Error_Message = Forbidden at com.thoughtworks.selenium.HttpCommandProcessor.throwAssertionFailureExceptionOrError(HttpCommandProcessor.java:97) at com.thoughtworks.selenium.HttpCommandProcessor.doCommand(HttpCommandProcessor.java:91) at com.thoughtworks.selenium.DefaultSelenium.open(DefaultSelenium.java:335) at org.pimslims.seleniumtest.FirstTest.testNew(FirstTest.java:32) ... I can do a similar test on http:/ /localhost:8080 (space between the slashes here because SO thinks I'm spamming) and it's fine - I can make IE open that Tomcat default page and click a link. It's only if I try to open my application at http:/ /localhost:8080/pims that I see this error - and only in IE. I can open that URL in IE by typing it into the address bar. I was convinced that there's some setting in IE that's causing this, but I've tried everything I can think of. http:/ /localhost:8080 is in my Trusted Sites, and I've turned the security for that zone down to the minimum, allowed anything that looks related to popups, etc. If I try adding http:/ /localhost:8080/pims/ to Trusted Sites, IE says it's already there. I've also messed around with proxy settings, to no avail, but may have missed something obvious. I've tried starting the test with *iexplore, *iehta, and *iexploreproxy - all behave the same. Is there something I've missed? For reference, here is my test case - this works as is, in Firefox, opening the PIMS application's index page and clicking a link: public class FirstTest extends SeleneseTestCase { @Override public void setUp() throws Exception { this.setUp("http://localhost:8080/", "*firefox"); } public void testNew() throws Exception { final Selenium s = this.selenium; s.open("/pims"); s.click("logInOutLink"); s.waitForPageToLoad("30000"); } } Any help is greatly appreciated!

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• How do I pass data from a BroadcastReceiver through to an Activity being started?

  - by Tom Hume

  I've got an Android application which needs to be woken up sporadically throughout the day. To do this, I'm using the AlarmManager to set up a PendingIntent and have this trigger a BroadcastReceiver. This BroadcastReceiver then starts an Activity to bring the UI to the foreground. All of the above seems to work, in that the Activity launches itself correctly; but I'd like the BroadcastReceiver to notify the Activity that it was started by the alarm (as opposed to being started by the user). To do this I'm trying, from the onReceive() method of the BroadcastReceiver to set a variable in the extras bundle of the intent, thus: Intent i = new Intent(context, MyActivity.class); i.putExtra(wakeupKey, true); i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(i); In the onResume() method of my Activity, I then look for the existence of this boolean variable: protected void onResume() { super.onResume(); String wakeupKey = "blah"; if (getIntent()!=null && getIntent().getExtras()!=null) Log.d("app", "onResume at " + System.currentTimeMillis() + ":" + getIntent().getExtras().getBoolean(wakeupKey)); else Log.d("app", "onResume at " + System.currentTimeMillis() + ": null"); } The getIntent().getExtras() call in onResume() always returns null - I don't seem to be able to pass any extras through at all in this bundle. If I use the same method to bind extras to the PendingIntent which triggers the BroadcastReceiver however, the extras come through just fine. Can anyone tell me what's different about passing a bundle from a BroadcastReceiver to an Activity, as opposed to passing the bundle from an Activity to a BroadcastReceiver? I fear I may be doing something very very obvious wrong here...

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• Question about Multicast Delegates?

  - by IbrarMumtaz

  I am going through some exam questions for the 70-536 exam and an actual question one developer posted on his blog has popped up in my exam questions. I cannot remember what his answer was .... but below is the question: You need to write a multicast delegate that accepts a DateTime argument and returns a bool value. Which code segment should you use? A: public delegate int PowerDeviceOn(bool, DateTime) B: public delegate bool PowerDeviceOn(Object, EventArgs) C: public delegate void PowerDeviceOn(DateTime) D: public delegate bool PowerDeviceOn(DateTime) The answer is A. Can someone please explain why? As I already did some research into this question a while ago and so I was sure that it was C, obviously now looking back at the question its clear that I did not read properly. As i was sure I had seen the same one before so I jumped to the most obvious one. A variation on this question: You need to write a multicast delegate that accepts a DateTime argument. Which code segment should you use? A: public delegate int PowerDeviceOn(bool, DateTime) B: public delegate bool PowerDeviceOn(Object, EventArgs) C: public delegate void PowerDeviceOn(DateTime) D: public delegate bool PowerDeviceOn(DateTime) Now this is another variation on this question, it still has the same bogus sample answers, as they still kind work in throwing the exam taker off. Notice how by simply keeping the sample answers the same and by removing a small portion of the question text, the answer is C and not A. The variation has no official answer as I just conjured it up using the exam question as a baseplate. The answer is definitely C. This time round its easy to see why C is correct but the very first question I have an inkling but as you know an inkling is not good enough in passing exams. Thanks For Reading.

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• Fade HTML element with raw javascript

  - by jnkrois

  It's my second question of the day related to the same problem, so I apologize for that. I was able to put together a function to "fade out" an element, and it works just fine, my problem is that when I try to reverse it, so the element "fades in" it does not work. I've tried to change the obvious, but I can't understand what I'm doing wrong. My code so far is as follows: Given I have a "div" like so: <div id="test" style="width:200px; height:200px; display:block; opacity:1; background-color:red;"></div> The JavaScript function that I'm using to fade it out is: var getElement = document.getElementById('test'); function fadeOut(elem, speed){ if(!elem.style.opacity){ elem.style.opacity = 1; } var desvanecer = setInterval(function(){ elem.style.opacity -= .02; if(elem.style.opacity < 0){ clearInterval(desvanecer); } }, speed / 50); } fadeOut(getElement, 500); Could somebody take a look at this and let me know what I'm doing wrong, all I want to do is "FADE IN" an element to an opacity equal to "1". By the way, I can't use jQuery, however I'm eager to learn this way. Thanks

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• Stack and Hash joint

  - by Alexandru

  I'm trying to write a data structure which is a combination of Stack and HashSet with fast push/pop/membership (I'm looking for constant time operations). Think of Python's OrderedDict. I tried a few things and I came up with the following code: HashInt and SetInt. I need to add some documentation to the source, but basically I use a hash with linear probing to store indices in a vector of the keys. Since linear probing always puts the last element at the end of a continuous range of already filled cells, pop() can be implemented very easy without a sophisticated remove operation. I have the following problems: the data structure consumes a lot of memory (some improvement is obvious: stackKeys is larger than needed). some operations are slower than if I have used fastutil (eg: pop(), even push() in some scenarios). I tried rewriting the classes using fastutil and trove4j, but the overall speed of my application halved. What performance improvements would you suggest for my code? What open-source library/code do you know that I can try?

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• Why does Cut/Paste of form components sometimes stop working in Delphi 2007 IDE?

  - by robsoft

  This is driving me crazy. I'm not going to take it anymore. I'm going to ask, even at the risk of eternal public humiliation! (If it's something really obvious or that I've done to the system myself). For reasons I've never quite had the patience to work out, every so often the form I'm working on in Delphi 2007's visual form editor goes 'pseudo-read-only'; I can add new components to the form, I can move/resize existing ones (and change any properties in the Object Inspector), and I can select a component and 'copy' it to the clipboard. But I'm completely unable to cut a component from the form, or paste a new copy down. I don't believe it's to do with the 'Lock Controls' Edit menu option as I can toggle this on or off and it has the effect it's supposed to - this disappearance of Cut & Paste happens on the right-click context menu, from the keyboard and from the main Edit menu - it's as if the form has become read only to thing to do with the clipboard. If I close the form in the IDE and then reopen it, everything starts working fine again (just as D1, D3, D5 and D7 always did for me, previously). I'm not going mad, as I'm sure I read something about why this happens on a newsgroup once and it's caught me out from time to time many many times in the last few months, but I've failed to find the newsgroup reference this evening and I've decided that, as more and more Delphi users seem to be making use of StackOverflow, it was worth asking here. Help - when I'm doing lots of form-work it drives me absolutely mad!

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• Base class -> Derived class and vice-versa conversions in C++

  - by Ivan Nikolaev

  Hi! I have the following example code: #include <iostream> #include <string> using namespace std; class Event { public: string type; string source; }; class KeyEvent : public Event { public: string key; string modifier; }; class MouseEvent : public Event { public: string button; int x; int y; }; void handleEvent(KeyEvent e) { if(e.key == "ENTER") cout << "Hello world! The Enter key was pressed ;)" << endl; } Event generateEvent() { KeyEvent e; e.type = "KEYBOARD_EVENT"; e.source = "Keyboard0"; e.key = "SPACEBAR"; e.modifier = "none"; return e; } int main() { KeyEvent e = generateEvent(); return 0; } I can't compile it, G++ throws an error of kind: main.cpp: In function 'int main()': main.cpp:47:29: error: conversion from 'Event' to non-scalar type 'KeyEvent' requested I know that the error is obvious for C++ guru's, but I can't understand why I can't do the conversion from base class object to derived one. Can someone suggest me the solution of the problem that I have? Thx in advice

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• Matching first set of elements with xpath...

  - by Ugo Enyioha

  I have an xml document that looks like this. <foo> <bar type="artist"/> Bob Marley </bar> <bar type="artist"/> Peter Tosh </bar> <bar type="artist"/> Marlon Wayans </bar> </foo> <foo> <bar type="artist"/> Bob Marley </bar> <bar type="artist"/> Peter Tosh </bar> <bar type="artist"/> Marlon Wayans </bar> </foo> <foo> <bar type="artist"/> Bob Marley </bar> <bar type="artist"/> Peter Tosh </bar> <bar type="artist"/> Marlon Wayans </bar> </foo> I would like to construct an xpath that returns only the first set: <bar type="artist"/> Bob Marley </a> <bar type="artist"/> Peter Tosh </a> <bar type="artist"/> Marlon Wayans </a> How would one go about this? I have tried //bar[@type='artist'] but it's obvious there's more to this. Thanks in advance.

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• Project ideas for automated deduction/automated theorem proving?

  - by wsh

  Dear Stack Overflow brethren, I'm a second-semester junior who will embark upon my thesis soon, and I have an interest in automated deduction and automated theorem provers. As in, I'd like to advance the art in some way (I don't mean that pretentiously, but I do want to do something productive). I've Googled pretty far and wide and so far few promising ideas have emerged. There are a few student project idea pages, but most seem either horribly outdated or too advanced (I was originally going to attempt to synthesize postmodernist thought (hahaha) and abstract its logical content, build a complete and consistent model (if possible, of course), and attempt to automate it, grounding said model as possible in a nonstandard logic a la these. My advisor thought that gave postmodernist thought too much credit (a while ago I reimplemented the Postmodernism Generator in Haskell with Parsec, so that is in part where the idea came from); I am tempted to concur.) So, yeah. Does anyone have ideas? I apologize if there is some obvious gap in my approach here/if I haven't appropriately done my homework (and if there is one, please tell me!), but in large part I don't even know where to start, and thank you for reading all that.

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• "no block given" errors with cache_money

  - by emh

  i've inherited a site that in production is generating dozens of "no block given" exceptions every 5 minutes. the top of the stack trace is: vendor/gems/nkallen-cache-money-0.2.5/lib/cash/accessor.rb:42:in `add' vendor/gems/nkallen-cache-money-0.2.5/lib/cash/accessor.rb:33:in `get' vendor/gems/nkallen-cache-money-0.2.5/lib/cash/accessor.rb:22:in `call' vendor/gems/nkallen-cache-money-0.2.5/lib/cash/accessor.rb:22:in `fetch' vendor/gems/nkallen-cache-money-0.2.5/lib/cash/accessor.rb:31:in `get' so it appears that the problem is in the cache money plugin. has anyone experienced something similar? i've cut and pasted the relevant code below -- anyone more familiar with blocks able to discern any obvious problems? 11 def fetch(keys, options = {}, &block) 12 case keys 13 when Array 14 keys = keys.collect { |key| cache_key(key) } 15 hits = repository.get_multi(keys) 16 if (missed_keys = keys - hits.keys).any? 17 missed_values = block.call(missed_keys) 18 hits.merge!(missed_keys.zip(Array(missed_values)).to_hash) 19 end 20 hits 21 else 22 repository.get(cache_key(keys), options[:raw]) || (block ? block.call : nil) 23 end 24 end 25 26 def get(keys, options = {}, &block) 27 case keys 28 when Array 29 fetch(keys, options, &block) 30 else 31 fetch(keys, options) do 32 if block_given? 33 add(keys, result = yield(keys), options) 34 result 35 end 36 end 37 end 38 end 39 40 def add(key, value, options = {}) 41 if repository.add(cache_key(key), value, options[:ttl] || 0, options[:raw]) == "NOT_STORED\r\n" 42 yield 43 end 44 end

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• Parsec: backtracking not working

  - by Nathan Sanders

  I am trying to parse F# type syntax. I started writing an [F]Parsec grammar and ran into problems, so I simplified the grammar down to this: type ::= identifier | type -> type identifier ::= [A-Za-z0-9.`]+ After running into problems with FParsec, I switched to Parsec, since I have a full chapter of a book dedicated to explaining it. My code for this grammar is typeP = choice [identP, arrowP] identP = do id <- many1 (digit <|> letter <|> char '.' <|> char '`') -- more complicated code here later return id arrowP = do domain <- typeP string "->" range <- typeP return $ "("++domain++" -> "++range++")" run = parse (do t <- typeP eof return t) "F# type syntax" The problem is that Parsec doesn't backtrack by default, so > run "int" Right "int" -- works! > run "int->int" Left "F# type syntax" unexpected "-" expecting digit, letter, ".", "`" or end of input -- doesn't work! The first thing I tried was to reorder typeP: typeP = choice [arrowP, identP] But this just stack overflows because the grammar is left-recursive--typeP never gets to trying identP because it keeps trying arrowP over and over. Next I tried try in various places, for example: typeP = choice [try identP, arrowP] But nothing I do seems to change the basic behaviours of (1) stack overflow or (2) non-recognition of "-" following an identifier. My mistake is probably obvious to anybody who has successfully written a Parsec grammar. Can somebody point it out?

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• Should all public methods of an API be documented?

  - by cynicalman

  When writing "library" type classes, is it better practice to always write markup documentation (i.e. javadoc) in java or assume that the code can be "self-documenting"? For example, given the following method stub: /** * Copies all readable bytes from the provided input stream to the provided output * stream. The output stream will be flushed, but neither stream will be closed. * * @param inStream an InputStream from which to read bytes. * @param outStream an OutputStream to which to copy the read bytes. * @throws IOException if there are any errors reading or writing. */ public void copyStream(InputStream inStream, OutputStream outStream) throws IOException { // copy the stream } The javadoc seems to be self-evident, and noise that just needs to be updated if the funcion is changed at all. But the sentence about flushing and not closing the stream could be valuable. So, when writing a library, is it best to: a) always document b) document anything that isn't obvious c) never document (code should speak for itself!) I usually use b), myself (since the code can be self-documenting otherwise)...

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• Regex: Use start of line/end of line signs (^ or $) in different context

  - by fgysin

  While doing some small regex task I came upon this problem. I have a string that is a list of tags that looks e.g like this: foo,bar,qux,garp,wobble,thud What I needed to do was to check if a certain tag, e.g. 'garp' was in this list. (What it finally matches is not really important, just if there is a match or not.) My first and a bit stupid try at this was to use the following regex: [^,]garp[,$] My idea was that before 'garp' there should either be the start of the line/string or a comma, after 'garp' there should be either a comma or the end of the line/string. Now, it is instantly obvious that this regex is wrong: Both ^ and $ change their behaviour in the context of the character class [ ]. What I finally came up with is the following: ^garp$|^garp,|,garp,|,garp$ This regex just handles the 4 cases one by one. (Tag at beginning of list, in the center, at the end, or as the only element of the list.) The last regex is somehow a bit ugly in my eyes and just for funs sake I'd like to make it a bit more elegant. Is there a way how the start of line/end of line characters (^ and $) can be used in the context of character classes?

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• Using Google Visualization in GWT 2.0

  - by nick

  I'm working on learning GWT (total newb) and have a question regarding the Visualiztion API provided by Google. This page: http://code.google.com/p/gwt-google-apis/wiki/VisualizationGettingStarted Describes getting started with a pie chart (which is what I need). However I'm trying to do this in a composite UI using UiBinder. To that end I don't know how to handle the callback correctly that is shown: public class SimpleViz implements EntryPoint { public void onModuleLoad() { // Create a callback to be called when the visualization API // has been loaded. Runnable onLoadCallback = new Runnable() { public void run() { Panel panel = RootPanel.get(); // Create a pie chart visualization. PieChart pie = new PieChart(createTable(), createOptions()); pie.addSelectHandler(createSelectHandler(pie)); panel.add(pie); } }; // Load the visualization api, passing the onLoadCallback to be called // when loading is done. VisualizationUtils.loadVisualizationApi(onLoadCallback, PieChart.PACKAGE); } My First assumption is this would go in the UiBinder constructor, correct? Yet this assumes that I want to place the element in the RootLayoutPanel, and I don't. I can't see an elegant and obvious way of placing it in the binder. I submit that even this guess may be wrong. Any ideas from the experts?

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• What's are the best readings to start using WPF instead of WinForms?

  - by Ivan

  Keeping in mind what CannibalSmith once said - "All the answers are saying "WPF is different". That's a huge understatement. You not only have to learn lots of new stuff - you must forget everything you've learned from Forms. It's a completely new way of doing UI." .. and having many years of experience with visual Windows desktop applications development (VB6, Borland C++ Builder VCL, WinForms) (which is hard to forget), how do I quickly move to developing to say well-formed WPF applications with Visual Studio? I don't need boozy-woozy graphics to give my app look and feel of a Hollywood blockbuster or a million dollar pyjamas. I always loved tidiness of standard Windows common controls and UI design guidelines, end even more I enjoyed them under Vista Glass Aero Graphite sauce. I am perfectly satisfied with WinForms but I want to my applications to be built of the most efficient and up-to-date standard technologies and architectured according to the most efficient and flexible patterns of today and tomorrow, leveraging interface-based integration and functionality reuse and to take all advantages of modern hardware and APIs to maximize performance, usability, reliability, maintainability, extensibility, etc. I very much like the idea of separating view, logic and data, letting a view to take all advantages of the platform (may it run as a web browser applet on a thin client or as a desktop application on a PC with a latest GPU), letting logic be reused, parallelized and seamlessly evolve, storing data in a well structured format in a right place. But... while moving from VB6 to Borland C++ Builder was very easy (no books/tutorials needed to turn it on and start working) (assuming I already knew C++), moving from BCB to WinForms was the same seamless, it does not seem any obvious to me how to do with WPF. So how do I best convert myself from a WinForms developer into a right-way thinking and doing WPF developer?

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• How do I reset the scale/zoom of a web app on an orientation change on the iPhone?

  - by Elisabeth

  I'm having the same problem that a couple of others have had with getting the correct behavior in a web app on an orientation change, and there doesn't seem to be an obvious solution - I've seen this question asked a couple of times on Stack Overflow and no one's yet been able to answer it. When I start the app in portrait mode, it works fine. Then I rotate into landscape and it's scaled up. To get it to scale correctly for the landscape mode I have to double tap on something twice, first to zoom all the way in (the normal double tap behavior) and again to zoom all the way out (again, the normal double tap behavior). When it zooms out, it zooms out to the correct NEW scale for landscape mode. Switching back to portrait seems to work more consistently; that is, it handles the zoom so that the scale is correct when the orientation changes back to portrait. I am trying to figure out if this is a bug? or if this is something that can be fixed with Javascript? With the viewport meta content, I am setting the initial-scale to 1.0 and I am NOT setting minimum or maximum scale (nor do I want to). I am setting the width to device-width. Any ideas? I know a lot of people would be grateful to have a solution as it seems to be a persistent problem. Thank you!

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• Can't send client certificate via SslStream

  - by Jonathan

  I am doing an SSL3 handshake using an SslStream, but, in spite of my best efforts, the SslStream never sends a client certificate on my behalf. Here is the code: SSLConnection = new System.Net.Security.SslStream(SSLInOutStream, false, new System.Net.Security.RemoteCertificateValidationCallback(AlwaysValidRemoteCertificate), new System.Net.Security.LocalCertificateSelectionCallback(ChooseLocalCertificate)); X509CertificateCollection CC = new X509CertificateCollection(); CC.Add(Org.BouncyCastle.Security.DotNetUtilities.ToX509Certificate(MyLocalCertificate)); SSLConnection.AuthenticateAsClient("test", CC, System.Security.Authentication.SslProtocols.Ssl3, false); and then I have AlwaysValidRemoteCertificate just returning true, and ChooseLocalCertificate returning the zeroth element of the array. The code probably looks a little weird because the project is a little weird, but I think that is beside the point here. The SSL handshake completes. The issue is that instead of sending a certificate message on my behalf (in the handshake process), with the ASN.1 encoded certificate (MyLocalCertificate), the SslStream sends an SSL alert number 41 (no certificate) and then carries on. I know this from packet sniffing. After the handshake is completed, the SslStream marks IsAuthenticated as true, IsMutuallyAuthenticated as false, and its LocalCertificate member is null. I feel like I'm probably missing something pretty obvious here, so any ideas would be appreciated. I am a novice with SSL, and this project is off the beaten path, so I am kind of at a loss. P.S. 1: My ChooseLocalCertificate routine is called twice during the handshake, and returns a valid (as far as I can tell), non-null certificate both times. P.S. 2: SSLInOutStream is my own class, not a NetworkStream. Like I said, though, the handshake proceeds mostly normally, so I doubt this is the culprit... but who knows?

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• Objective-C Protocols within Protocols

  - by LucasTizma

  I recently began trying my hand at using protocols in my Objective-C development as an (obvious) means of delegating tasks more appropriately among my classes. I completely understand the basic notion of protocols and how they work. However, I came across a roadblock when trying to create a custom protocol that in turn implements another protocol. I since discovered the solution, but I am curious why the following DOES NOT work: @protocol STPickerViewDelegate < UIPickerViewDelegate > - ( void )customCallback; @end @interface STPickerView : UIPickerView { id < STPickerViewDelegate > delegate; } @property ( nonatomic, assign ) id < STPickerViewDelegate > delegate; @end Then in a view controller, which conforms to STPickerViewDelegate: STPickerView * pickerView = [ [ STPickerView alloc ] init ]; pickerView.delegate = self; - ( void )customCallback { ... } - ( NSString * )pickerView:( UIPickerView * )pickerView titleForRow:( NSInteger )row forComponent:( NSInteger )component { ... } The problem was that pickerView:titleForRow:forComponent: was never being called. On the other hand, customCallback was being called just fine, which isn't too surprising. I don't understand why STPickerViewDelegate, which itself conforms to UIPickerViewDelegate, does not notify my view controller when events from UIPickerViewDelegate are supposed to occur. Per my understanding of Apple's documentation, if a protocol (A) itself conforms to another protocol (B), then a class (C) that conforms to the first protocol (A) must also conform to the second protocol (B), which is exactly the behavior I want and expected. What I ended up doing was removing the id< STPickerViewDelegate > delegate property from STViewPicker and instead doing something like the following in my STViewPicker implementation where I want to evoke customCallback: if ( [ self.delegate respondsToSelector:@selector( customCallback ) ] ) { [ self.delegate performSelector:@selector( customCallback ) ]; } This works just fine, but I really am puzzled as to why my original approach did not work.

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• Loading a RSA private key from memory using libxmlsec

  - by ereOn

  Hello, I'm currently using libxmlsec into my C++ software and I try to load a RSA private key from memory. To do this, I searched trough the API and found this function. It takes binary data, a size, a format string and several PEM-callback related parameters. When I call the function, it just stucks, uses 100% of the CPU time and never returns. Quite annoying, because I have no way of finding out what is wrong. Here is my code: d_xmlsec_dsig_context->signKey = xmlSecCryptoAppKeyLoadMemory( reinterpret_cast<const xmlSecByte*>(data), static_cast<xmlSecSize>(datalen), xmlSecKeyDataFormatBinary, NULL, NULL, NULL ); data is a const char* pointing to the raw bytes of my RSA key (using i2d_RSAPrivateKey(), from OpenSSL) and datalen the size of data. My test private key doesn't have a passphrase so I decided not to use the callbacks for the time being. Has someone already done something similar ? Do you guys see anything that I could change/test to get forward on this problem ? I just discovered the library on yesterday, so I might miss something obvious here; I just can't see it. Thank you very much for your help.

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• python / sqlite - database locked despite large timeouts

  - by Chris Phillips

  Hi, I'm sure I'm missing something pretty obvious, but I can't for the life of me stop my pysqlite scripts crashing out with a database is locked error. I have two scripts, one to load data into the database, and one to read data out, but both will frequently, and instantly, crash depending on what the other is doing with the database at any given time. I've got the timeout on both scripts set to 30 seconds: cx = sqlite.connect("database.sql", timeout=30.0) and think I can see some evidence of the timeouts in that i get what appears to be a timing stamp (e.g 0.12343827e-06 0.1 - and how do I stop that being printed?) dumped occasionally in the middle of my curses formatted output screen, but no delay that ever gets remotely near the 30 second timeout, but still one of the other keeps crashing again and again from this. I'm running RHEL5.4 on a 64 bit 4 cpu HS21 IBM blade, and have heard some mention about issues about multi-threading and am not sure if this might be relevant. Packages in use are sqlite-3.3.6-5 and python-sqlite-1.1.7-1.2.1, and upgrading to newer versions outside of RedHat's official provisions is not a great option for me. Possible, but not desirable due to the environment in general. I have had autocommit=1 on previously on both scripts, but have since disabled on both, and am now cx.commit()ing on the inserting script and not committing on the select script. Ultimately as I only ever have one script actually making any modifications, I don't really see why this locking should ever ever happen. I have noticed that this is significantly worse over time when the database has gotten larger. It was recently at 13mb with 3 equal sized tables, which was about 1 day's worth of data. creating a new file has significantly improved this, which seems understandable, but the timeout ultimately just doesn't seem to be being obeyed. Any pointers very much appreciated. Thanks Chris

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