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• How to pass a value between Silverlight pages for WP7?

  - by Sebastian Gray

  I've got a MainPage.xaml page a Detail.xaml page. I've passed variables to the Detail.xaml from MainPage.xaml by using a static variable and referencing it in Detail.xaml (the detail page is acting like a dialog). However once I've updated the content of another object, I want to call a method in MainPage.xaml to refresh the content of that page using the updated object from the Detail.xaml page. I assume I am not using the correct paradigm for this and should probably be using MVVM or something but I'm not familiar with the implementation and was hoping there was a simple way to do this?

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• PHP reporting error. DB verify how to?

  - by iamfab

  Error reporting Notice: Undefined variable: random_chars in wamp\www\php_sandbox\idgen.php on line 21 Call Stack: # Time Memory Function Location 1 0.0045 678928 {main}( ) ..\idgen.php:0 GPB7446 How do I fix this error? Using this code like an automatic unique id generator. How do I connect to DB to verify code is truly unique before allowing it to be assigned to a user creating a new account? Thanks <?php $characters = array( "A","B","E","F","G","H","J","K","M","N","P","R","S","T","W","X","Y","Z"); $keys = array(); while(count($keys) < 3) { $x = mt_rand(0, count($characters)-1); if(!in_array($x, $keys)) { $keys[] = $x; } } foreach($keys as $key){ $random_chars .= $characters[$key];} $randNum = rand(2327,9987); $randLet = rand(2327,9987); echo $random_chars . $randNum; ?>

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• Intercept close Popup from Parent Page

  - by sangi

  Hi all, I have a question. In an html page, I have javascript code that allows me to open and close a popup window by clicking on a link displayed in the link, so the text displayed in the link changes to the state of the popup window (open-closed). With a variable true / false I manage the opening and closing of the popup window to click on a link whose text is aligned "opened popup" / "closed popup". The next step is to make this same change in state (true / false, "opened popup" / "close popup") directly by closing the popup window. The idea is to not have to refresh the page. Is this possible? Thank you and best regards

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• html5, adding an eventlistener to a drawn image on canvas

  - by pfunc

  I am experimenting with html5 and I have a little image dropdown, the user selects and image and it draws it to the canvas using drawImage(); I can't seem to figure out how to add an event listener to the newly drawn image on the canvas. I have tried putting it in a variable like so: var newImg = ctx.drawImage(myImage, 200, 200); and then adding an eventlistener to that, but it doesn't seem to work. newImg.addEventListener('mousedown', onImgClick, false); What is the correct way to do this.

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• htaccess mod rewrite files to go through php first?

  - by jiexi

  I have a directory full of files. Originally people were allowed to direct link to these files. Now i would like to run all files through a php file first. Could someone help me with the .htaccess needed to do that? The phpfile used to handle the downloads will be called download.php and it will have a get variable called $ref So i need noob.com/games.zip to goto noob.com/download.php?ref=games.zip BUT still retaining the url of noob.com/games.zip Thanks!

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• Simple Obj-C Memory Management Question

  - by yar

  This is from some sample code from a book // On launch, create a basic window - (void)applicationDidFinishLaunching:(UIApplication *)application { UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:[[HelloController alloc] init]]; [window addSubview:nav.view]; [window makeKeyAndVisible]; } But a release is never called for window nor for nav. Release should be called since alloc was called, right? If #1 is right, then I would need to store a reference to each of these in an instance variable in order to release them in the dealloc? Perhaps I'm wrong all around...

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• Java ME Application running fine in Emulator but crashing when deployed to N70. Any way to identify

  - by sana

  I have developed a Java ME application for CLDC platform. It works fine when executed in an emulator. But when i deploy it to my N70 phone the application doesn't start at all in the phone. In my application there are some 14 classes and am creating an instance of each and putting them in the vector on application start. The classes just have one variable and 2 methods. Can this creating of lot of instances be the reason for its crashing? Is there any way I can find out the reason why the application is not able to start in the phone?

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• Cant free memory.

  - by atch

  In code: int a[3][4] = {1,2,3,4, 5,6,7,8, 9,10,11,12}; template<class T, int row, int col> void invert(T a[row][col]) { T* columns = new T[col]; T* const free_me = columns; for (int i = 0; i < col; ++i) { for (int j = 0; j < row; ++j) { *columns = a[j][i]; ++columns;//SOMETIMES VALUE IS 0 } } delete[] free_me;//I'M GETTING ERROR OF HEAP ABUSE IN THIS LINE } int main(int argc, char* argv[]) { invert<int,3,4>(a); } I've observed that while iterating, value of variable columns equals zero and I think thats the problem. Thanks for your help.

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• infix formula in the input

  - by gcc

  input: sqrt(2 - sin(3*A/B)^2.5) + 0.5*(C*~(D) + 3.11 +B) a b /*there are values for a,b,c,d */ c d input : sqrt(2 - asin(3*A/B)^2.5) +cos(0.5*(C*~(D)) + 3.11 +B) a b /*there are values for a,b,c,d */ c d input: sqrt(2 - sin(3*A/B)^2.5)/(0.5*(C*~(D)) + sin(3.11) +ln(B)) /*max lenght of formula is 250 characters*/ a b /*there are values for a,b,c,d */ c /*each variable with set of floating numbers*/ d As you can see infix formula in the input depends on user. My program will take a formula and n-tuples value. Then it calculate the results for each value of a,b,c and d. If you wonder I am saying ;outcome of program is graph. I dont know way how to store the formula so that I can do my job with easy. can you show me? a,b,c,d is letters cos,sin,sqrt,ln is function

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• PHP Check if <ul> has ended IF it exists

  - by Krewe

  I have my blog generate a preview by taking the first 300 characters and cut off the last whole word. My problem is, when I have a list near the top of the blog it is sometimes included in the preview, however the end list tag usually never is. So how can I check the $preview variable for a starting list tag, and if it is found, check for an ending tag and if it's not there add one. All the code for my preview. $preview = wordwrap($content, 300); $preview = explode("\n", $preview); $preview = $preview[0] . "...";

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• Entity Framework 5 upgrade from 4

  - by user1714591

  I'm having an issue with the Where clause in a search, in my original version EF4 I could add a Where clause with 2 parameters, the where clause (string predicate) and a ObjectParameter list such as var query = context.entities.Where(WhereClause.ToString(), Params.ToArray()); since my upgrade to EF5 I don't seem to have that option am I missing something? This was originally used to build dynamic where clause such as "it.entity_id = @entity_id" then holding the variable value in the ObjectParameter. I'm hoping I don't have to rewrite all the searches that have been built out this way, so any assistance would be greatly appreciated. Cheers

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• Javascript: Access the right scope "under" apply(...)

  - by Chau

  This is a very old problem, but I cannot seem to get my head around the other solutions presented here. I have an object function ObjA() { var a = 1; this.methodA = function() { alert(a); } } which is instantiated like var myObjA = new ObjA(); Later on, I assign my methodA as a handler function in an external Javascript Framework, which invokes it using the apply(...) method. When the external framework executes my methodA, this belongs to the framework function invoking my method. Since I cannot change how my method is called, how do I regain access to the private variable a? My research tells me, that closures might be what I'm looking for.

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• C# : FieldInfo.GetValue returns null

  - by Florian

  Hi and Happy New year ! I've a problem to retrieve my control f2 in the variable o via Reflection : public partial class Form1 : Form { private Form2 f2; public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Form2 f2 = new Form2(); f2.Show(); } private void button2_Click(object sender, EventArgs e) { Type controlType = this.GetType(); FieldInfo f = controlType.GetField("f2", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance); object o = f.GetValue(this); // o == null; } } Thank you for your help !

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• How to conditionalize GUI tests using Netbeans/Maven vs maven on command line invocation

  - by Ilane

  I'd like to have a single project pom but have my GUI tests always run when I'm invoking JUnit on Netbeans, but have them conditional (on an environment variable?) when building on the command line (usually for production build - on a headless machine, but sometimes just for build speed). I don't mind instrumenting my JUnit tests for this, as I already have to set up my GUI test infrastructure, but how do I conditionalize my pom! Netbeans 6.5 with Maven plugin. Any ideas how I can accomplish this? Ilane

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• Setting precision on std::cout in entire file scope - C++ iomanip

  - by Ivan

  Hi all, I'm doing some calculations, and the results are being save in a file. I have to output very precise results, near the precision of the double variable, and I'm using the iomanip setprecision(int) for that. The problem is that I have to put the setprecision everywhere in the output, like that: func1() { cout<<setprecision(12)<<value; cout<<setprecision(10)<<value2; } func2() { cout<<setprecision(17)<<value4; cout<<setprecision(3)<<value42; } And that is very cumbersome. Is there a way to set more generally the cout fixed modifier? Thanks

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• How do you get the ID of a control in ASP.NET

  - by James

  I am attempting to loop through an array of numbers, match them to the checkbox they they are associated with, and checkmark that box. My checkbox is set up like: <input type="checkbox" runat="server" id="someID" name="somename" value="1234" /> My code when the page loads currently looks like: foreach (string interest in interests_Var){ foreach (var c in Page.Controls) { } } interests_Var is my array containing different numbers. We'll assume one of them is 1234. While looping through the page controls, I want to compare the value of the control to my number. If it equals my number, I want to then apply the attribute checked="checked". I'm assuming I have to find the ID of the control I am using, then use that ID to add a new attribute. Or is there a way I can add the attribute using the c variable? I'm not dead set on this setup, so if you know a better way, I'm all ears. Thanks for any help and suggestions.

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• How can I pass a Context object to a thread on call

  - by Pentium10

  I have this code fragment: public static class ExportDatabaseFileTask extends AsyncTask<String, Void, Boolean> { private final ProgressDialog dialog = new ProgressDialog(ctx); protected void onPreExecute(); protected Boolean doInBackground(final String... args); protected void onPostExecute(final Boolean success); } I execute this thread as new ExportDatabaseFileTask().execute(); As you see I use a ctx as Context variable in the new ProgressDialog call, how do I pass a context to the call method? to this one: new ExportDatabaseFileTask().execute();*

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• How to set the component size with GridLayout? Is there a better way?

  - by Blackbam

  Hello guys, I am working on a larger GUI with Java and I am becoming angry on Layout Managers. I have a "Settings-Panel" with a variable number of JComponents in it (Labels, Buttons, JSpinners, JSliders,...). I just want the following: JLabel <- JComponent JLabel <- JComponent JLabel <- JComponent ... My Panel has a size of 500px, so that there is enough space for a lot of components. Unfortunatly the GridLayout always stretches the size of the Components to the whole Panel, even if I set a MaximumSize for every component. It looks stupid if there are only two buttons each with a height of 250px. I tried flow Layout, but i cannot figure out a way to make new lines properly. I tried BoxLayout.Y_AXIS, but the Components are always centered, and Label and Component are not in the same line. Does anybody know a good and short way with LayoutManagers to handle this properly?

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• Why this C program outputs a negative number?

  - by JMSA

  I have assigned the complement value in an unsigned variable. Then why this C program outputs a negative number? #include<stdio.h> #include<conio.h> int main() { unsigned int Value = 4; /* 4 = 0000 0000 0000 0100 */ unsigned int result = 0; result = ~ Value; /* -5 = 1111 1111 1111 1011 */ printf("result = %d", result); /* -5 */ getch(); return 0; }

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• Direct flow depending on incoming dynamic type

  - by Improfane

  I have a listener class that accepts GUI change events in one method. The incoming event objects have a superclass of a type of GUI Event, the behaviour should depend on the dynamic type of the incoming variable. I wanted to do do lots of methods like: handleGUIEvent(EventChangedX event) handleGUIEvent(EventChangedY event) I am using a single event listener and receiving objects of various types but the behaviour should be different for each. What would you do? I do not want to use a switch statement as this would get unmaintainable.

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• How can CopyOnWriteArrayList be thread-safe?

  - by Shooshpanchick

  I've taken a look into OpenJDK's sources of CopyOnWriteArrayList and it seems that all write operations are protected by the same lock and read operations are not protected at all. As I understand, under JMM all accesses to a variable (both read and write) should be protected by lock or reordering effects may occur. For example, set(int, E) method contains these lines (under lock): /* 1 */ int len = elements.length; /* 2 */ Object[] newElements = Arrays.copyOf(elements, len); /* 3 */ newElements[index] = element; /* 4 */ setArray(newElements); The get(int) method, on the other hand, only does return get(getArray(), index);. In my understanding of JMM, this means that get may observe the array in an inconsistent state if statements 1-4 are reordered like 1-2(new)-4-2(copyOf)-3. Do I understand JMM incorrectly or is there any other explanations on why CopyOnWriteArrayList is thread-safe?

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• How to insert variables in R twitteR updates?

  - by analyticsPierce

  Hello, I am using the twitteR package in R to update my twitter status with results from analysis. The static tweet function works: library(twitteR) sess = initSession('username','password') tweet = tweet('I am a tweet', sess) However, when I add a variable to display some specific results I get an error. library(twitteR) sess = initSession('username','password') res = c(3,5,8) msg = cat('Results are: ', res, ', that is nice right?') tweet = tweet(msg, sess) Results in: Error in twFromJSON(rawToChar(out)) : Error: Client must provide a 'status' parameter with a value. Any suggestions are appreciated.

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• git, SSH_ASKPASS on windows

  - by Martin Schreiber

  I am writing a graphical git frontend for Linux and Windows (MSEgit) based on MSEide+MSEgui. MSEgit has an internal console window which communicates with git by pipes. On Linux it uses a PTY so SSH asks for key unlocking passwords on the PTY. On Windows I wrote a small password entry application and set the SSH_ASKPASS environment variable accordingly. SSH calls the password application if git is started with CreateProcess() dwCreationFlags DETACHED_PROCESS set but the password entry window will not be focused, its taskbar icon flashes instead. SSH does not run the password application if FreeConsole() is called to be sure that there is no attached console to MSEgit and git is started without DETACHED_PROCESS but CREATE_NO_WINDOW instead. I assume a Windows equivalent of POSIX setsid() should be called. How can I force SSH to use SSH_ASKPASS without the DETACHED_PROCESS flag? If this is not possible, how can I ensure that the password entry window is focused?

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• Alter Git prompt on Windows

  - by kko

  I'm using Git on Windows, installed through GitExtensions with MSysGit (latest) having selected "do not modify my Windows prompt" during installation. Now, I would like to be able to modify the default prompt (which by default shows just the branch name to also show me how much time, and how many local commits since I last pushed to origin (or specifically origin/master, whichever is easier). So say instead of: me@myPC /c/myRepo (master) I would see something along the lines of: me@myPC /c/myRepo (master) 5 | 10:20 meaning I have last pushed 10h 20min ago and I have made 5 local commits since. Before you mention it, I am aware there are ways of doing it with PowerShell, but I don't want to use it. I want my standard git bash we all know and love. I found a few solutions to that, with modifying PS1 variable in .bashrc file, but (excuse my poor Unix konwledge) they seem to be not working, (for example accepted answer to this question). So there you have it. Is this possible?

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• Reading bytes from a text file that has the form of machine code in C?

  - by rashid

  I have a text file with machine code in this form: B2 0A 05 B2 1A 01 B3 08 00 17 B2 09 18 where an instruction has this format: OP Mode Operand Note: Operand could be 1 or 2 bytes. Where:(example) OP = B2 Mode = 0A Operand = 05 How can I read the bytes in a variable? As shown in the above example. When i read the file I get individual characters. I have an array of pointers where I read individual line, but still cannot solve the problem of reading a byte. Any ideas,suggestions. I hope I am not confusing anyone here. Thank you.

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