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  • Why would a 'public event EventHandler cccc' be null?

    - by Matt
    Why would a 'public event EventHandler cccc' be null? I have a class that's public class Builder { public event EventHandler StartedWorking; public Builder() { // Constructor does some stuff } public void Start() { StartedWorking(this, eventargobject); //StartedWorking is null -- } } This seems straightforward and something I do all the time? Am I missing something obvious or is there something that could cause this? EDIT: Does this mean that if I fire an event that is not subscribed to in a client class I have to check that it is not null? EDIT-2: I guess I'd never had events that were never not subscribed to and hence never ran into this -- You learn something new every day Sorry about the seemingly stupid question....

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  • Create web page launcher, losing focus

    - by user356131
    I have created a php webpage. I now want to create a launcher application in android phone, it simply opens the browser with the url "http://<mywebsite>/m". I use uri intent to launch the browser in onCreate function. public void onCreate(...) { .... startActivity(new Intent(Intent.ACTION_VIEW, new Uri(http://<mywebsite>/m))); ... } I execute this program in my G1 phone (Cyan Mod 5). However, when I click the "Home" key, and then re-enter my application through Task list, I lose focus for my last started browser, and the screen blank Any suggestion?! Should I need any code in onResume function to re-focus my web!?

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  • How can i call NStimer form one viewcontroller from unother viewcontroller?

    - by Bala
    At first time i call the timer like this in Third viewcontroller timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(targetMethod) userInfo:nil repeats:NO]; Then timer called the targetMethod -(void)targetMethod { First * sVC = [[First alloc] initWithNibName:@"First" bundle:[NSBundle mainBundle]]; [self presentModalViewController:sVC animated:YES]; [sVC release]; [timer invalidate]; } First viewcontroller opened.. In First viewcontroller had one button.In button action i wrote (IBAction) Action:(id)sender { [self dismissModalViewControllerAnimated:YES]; Third *BVC=[[Third alloc]init]; [Bvc TimerStart]; Timestart is function i start timer in this function.. i want to call Third viewcontroller timer function this place } timer started..But view didn't open (first )viewcontroller....... Please help me......

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  • How to have a run in an Service?

    - by user1497664
    I have implemented an service that runs in a seperate process. This service contains a separate thread where i have a socket connection. This thread has a run() where it is continuously sending data to the port. My problem is after triggering the run() in the thread i don't get any contact with it anymore, i can see in the program that have open the socket that it consciously sends the data but the idea was that i while it is running i could change data that it sends for an example time. here is my run in the external thread: public void run() { if(run) { // Team and player names message is sent when entering in a game setBaseMessage(); SendMessageToCOMPort(base_message + CalculateCRC(base_message)); sleep(); // waits for 100 ms } } Anyone have any idea what might be wrong ?

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  • What will happen if the code can't finished on time...

    - by Tattat
    If I set a timer to execute a code every 3 seconds. If the code isn't finished in 3 seconds, what will happen? The computer will terminal the code or wait for the code finish or continue the timer, and execute the code with the unfinished code concurrently. int delay = 0; // delay for 0 sec. int period = 3000; // repeat 3 sec. Timer timer = new Timer(); timer.scheduleAtFixedRate(new TimerTask() { public void run() { // Task here ... // It may take more than 3 sec to finish, what will happen? } }, delay, period);

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  • How to call C++ function from C?

    - by claws
    I know this. Calling C function from C++: If my application was in C++ and I had to call functions from a library written in C. Then I would have used //main.cpp extern "C" void C_library_function(int x, int y);//prototype C_library_function(2,4);// directly using it. This wouldn't mangle the name C_library_function and linker would find the same name in its input *.lib files and problem is solved. Calling C++ function from C??? But here I'm extending a large application which is written in C and I need to use a library which is written in C++. Name mangling of C++ is causing trouble here. Linker is complaining about the unresolved symbols. Well I cannot use C++ compiler over my C project because thats breaking lot of other stuff. What is the way out? By the way I'm using MSVC

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  • application Crash when assign multiple argu fun to dynamic button

    - by AJPatel
    for (int i=0;i<[tableDataSource count];i++) { NSDictionary *dict = [tableDataSource objectAtIndex:i]; rowText = [dict objectForKey:@"title"]; UIButton *btn = [UIButton buttonWithType: UIButtonTypeRoundedRect]; [btn setTitle:rowText forState:UIControlStateNormal]; [btn addTarget:self action:@selector(myActionbtnText:) forControlEvents:UIControlEventTouchUpInside]; btn.frame = CGRectMake(60, 40+2*(40*i), 200, 40); btn.alpha = 0.81; [self.view addSubview:btn]; } I got error at assign Action to dynamic button MY action is given Below -(void) myAction:(NSString *)btnText; { NSLog(@"%@ Button Clicked",btnText); }

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  • Mapping restful ajax requests to spring

    - by Diones
    I have this piece of code: @RequestMapping(value = "/test.json", method = RequestMethod.GET) @ResponseStatus(HttpStatus.OK) public @ResponseBody Object[] generateFile(@RequestParam String tipo) { Object[] variaveis = Variavel.getListVariavelByTipo(tipo); return variaveis; } As far as I know it should take a request to test.json?tipo=H and return the JSON representation of Variavel[], however when I make such request I get: HTTP Status 406 - type Status report message descriptionThe resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers () By using the following function I can get the expected json: @RequestMapping(value = "/teste.json") public void testeJson(Model model, @RequestParam String tipo) { model.addAttribute("data", Variavel.getListVariavelByTipo("H")); } What I'm doing wrong?

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  • How would one call std::forward on all arguments in a variadic function?

    - by Noah Roberts
    I was just writing a generic object factory and using the boost preprocessor meta-library to make a variadic template (using 2010 and it doesn't support them). My function uses rval references and std::forward to do perfect forwarding and it got me thinking...when C++0X comes out and I had a standard compiler I would do this with real variadic templates. How though, would I call std::forward on the arguments? template < typename ... Params void f(Params ... params) // how do I say these are rvalue reference? { y(std::forward(...params)); //? - I doubt this would work. } Only way I can think of would require manual unpacking of ...params and I'm not quite there yet either. Is there a quicker syntax that would work?

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  • C++ toLowerCase Function won't work - Access violation

    - by misaizdaleka
    Hi, I have a simple function which takes an array of characters as an argument, and converts all the characters to lower case. However, I get a weird access violation error. Here's the code: void toLower(char *rec) { int i=0; while (rec[i]!='\0') { if (rec[i]>='A' && rec[i]<='Z') rec[i]='a'+rec[i]-'A'; //this is where I get an error - assigning the //the value to rec[i] is the problem i++; } } Can you tell me what's my mistake? Thanks

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  • ShowDialog and Hide form, when from is called from other object in VS2010

    - by Piotr Dabrowski
    Hallo, I have a modal Form, used for searching information in DB. This Form is used by a COM object, that waits for search result. Initialization of the form take a lot of time (because of building connection to DB). So, I initialize the Form (without showing it), and keep Form-object alive, as long as COM-object work. In this way I keep the state of the Form: public void Search() this.ShowDialog(); string result = this.ResultOfSearch; this.Hide() return result; And it doesn't work anymore on VS2010 (compiled for Framework 2.0). I search for alternative way to make a modal form (or a method to protect a form against Destroy() at the end of ShowDialog). Any ideas?

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  • NoSuchMethodException while using JAVA Reflection

    - by Appps
    Hi I'm trying to use reflection to invoke a method and update the setter value of that method. But I'm getting NoSuchMethodException while ivoking that method. com.test.Test.setAddress1(java.lang.Double) .But I've this method defined in my Class. Is the problem with my code. Can someone please help me? Thanks in advance. I've my code below. Class[] doubleArrayParamTypes = new Class[ 1 ]; doubleArrayParamTypes[ 0 ] = Double.class; Class class=Class.forName( "com.test.Test"); Object voObject = class.newInstance(); String data="TestData"; performMapping(class,"setAddress1",doubleArrayParamTypes ,voObject,data); /* Reflection to set the data */ private void performMapping(Class class,String methodName,Class[] clazz,Object voObject,Object data) { class.getMethod( "set" + methodName, clazz ).invoke( voObject, data ); }

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  • use class in another windows form c# ???

    - by Chelsea_cole
    I have a problem in a same namespace: public partial class frmForm1 : Form // Form1 { public class Account { public string Username; public string Password; public string RePassword; public string Name; public string bd; public string dt; public string dc; } public class ListAcc { public static int count = 0; private static List<Account> UserList; public static List<Account> Data() { return UserList; } } } public partial class frmForm2 : Form // Form2 { private void button2_Click(object sender, EventArgs e) { ListAcc A; // error string n = A<Account>[0].Usename; // error // What should i do? } } Someone can help me fix this problem? Thanks alot!

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  • Java Double Array

    - by user1062058
    I'm having trouble setting up and placing values into an array using a text file containing the floating point numbers 2.1 and 4.3 each number is separated by a space - below is the error I'm getting: Exception in thread "main" java.util.NoSuchElementException import java.util.*; import java.io.*; public class DoubleArray { public static void main(String[] args) throws FileNotFoundException { Scanner in = new Scanner(new FileReader("mytestnumbers.txt")); double [] nums = new double[2]; for (int counter=0; counter < 2; counter++) { int index = 0; index++; nums[index] = in.nextDouble(); } } } Thanks, I'm sure this isn't a hard question to answer... I appreciate your time.

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  • Can I make a pointer to the code, and pass to the next instruction?

    - by drigoSkalWalker
    Like this link http://gcc.gnu.org/onlinedocs/gcc-3.3.1/gcc/Labels-as-Values.html I can get the memory address of an label, so if I declare a label, get your address, and add your address, i will pass to next instruction? some ilustration int main () { void *ptr; label: instruction 1; instruction 2; ptr = &&label; // So if I do it... ptr = ptr + 1; // I will get the instruction 2 correct?? Thanks for all answers.

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  • HashMap "WriteOnce" Implementation .. need help

    - by JavaNewbie
    import java.util.*; public class HashMapExample { public static class WriteOnceMap<K, V> extends HashMap<K, V> { public V put(K key, V value) { /* WriteOnceMap is a map that does not allow changing value for a particular key. It means that put() method should throw IllegalArgumentException if the key is already assosiated with some value in the map. Please implement this method to conform to the above description of WriteOnceMap. */ } public void putAll(Map<? extends K, ? extends V> m) { /* Pleaase implement this method to conform to the description of WriteOnceMap above. It should either (1) copy all of the mappings from the specified map to this map or (2) throw IllegalArgumentException and leave this map intact if the parameter already contains some keys from this map. */ } } }

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  • Why would I want to have a non-standard attribute?

    - by dontWatchMyProfile
    The documentation on Core Data entities says: You might implement a custom class, for example, to provide custom accessor or validation methods, to use non-standard attributes, to specify dependent keys, to calculate derived values, or to implement any other custom logic. I stumbled over the non-standard attributes claim. It's just a guess: If my attribute is anything other than NSString, NSNumber or NSDate I will want to have a non-standard Attribute with special setter and getter methods? So, for example, if I wanted to store an image, this would be a non-standard Attribute with type NSData and a special method, say -(void)setImageWithFileURL:(NSURL*)url which then pulls the image data from the file, puts in in an NSData and assigns it to core data? Or did I get that wrong?

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  • what does this string.format piece of code do?

    - by jbkkd
    I have this piece of code in c#: private static void _constructRow(SqlDataReader reader, system.IO.StreamWriter stwr, bool getColumnName) { for (int i = 0; i < reader.FieldCount; i++) stwr.Writeline(String.Format("<td>{0}</td"), getColumnName ? reader.GetName(i) : reader.GetValue(i).ToString())); } I'm trying to understand what the part that start with "getColumnName ?" and ends with ".ToString()" does. I understood that it is a system.object type, but I have no idea what it specifically does or how it works. I want that because of this: "reader" had multiple rows in it, and I want to writeline only specific rows. If anyone can help me on either of those, I'd be grateful.

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  • question related to Iphone autorelease usage

    - by user524331
    Could someone help me please understand how allocation and memory management is done and handled in following scenario. i am giving a Psuedo code example and question thats troubling me is inline below: interface first { NSDecimalNumber *number1; } implementation ..... -(void) dealloc { [number1 release]; [super dealloc]; } ================================= interface second { NSDecimalNumber *number2; } implementation second ..... - (First*) check { First *firstObject = [[[First alloc] init] autorelease]; number1 = [[NSDecimalNumber alloc] initWithInteger:0]; **// do i need to autorelease number1 as well?** return firstObject; }

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  • How to reset buttons when using touchesBegan

    - by FireStorm
    When I use touchesBegan on my sprite kit game the buttons press down fine the first time but are unresponsive the second time, how do I "reset" these buttons if you will. Buttons are as follows: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint location = [touch locationInNode:self]; SKNode *node = [self nodeAtPoint:location]; if ([node.name isEqualToString:@"Button"]) { [self runAction:[SKAction playSoundFileNamed:@"sound" waitForCompletion: NO]]; .... Thanks for your help!

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  • BST Level Traversal

    - by Dalton Conley
    Ok, so I'm trying to do a level order traversal of a binary search tree and its not working. The code below makes sense to me, but that is probably because I've been looking at it forever and I've convinced myself that it should work. void BST<T>::levelByLevel(ostream &out) { Queue<BinNodePointer> q; BinNodePointer subtreeRoot; if(myRoot == NULL) return; q.enqueue(myRoot); while(!q.empty()) { subtreeRoot = q.front(); out << subtreeRoot->data << " "; q.dequeue(); if(subtreeRoot->left != NULL) q.enqueue(subtreeRoot->left); if(subtreeRoot->right != NULL) q.enqueue(subtreeRoot->right); } } Maybe you guys could point out what I'm doing wrong because, although I understand the concept of a binary search tree, I'm not 100% on all the ins and outs.

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  • I serialized a C++ object, how to allocate memory for it without knowing what type it is?

    - by Neo_b
    Hello, I have serialized a C++ object and I wish to allocate space for it, although I can't use the "new" operator, because I do not know the object's class. I tried using malloc(sizeof(object)), although trying to typecast the pointer to the type the serialized object is of, the program shut down. Where is the information about the object class stored? class object { public: virtual void somefunc(); int someint; }; class objectchild:public object { } object *o=(object*)malloc(sizeof(objectchild)); cout << int(dynamic_cast<objectchild*>(o)) << endl; This causes a program shutdown. Thank you in advance.

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  • iPhone:(Three20)Unselect (Unhiglight) TTTabItem dynamically?

    - by user187532
    Hello friends, I have four TabBarItem (TTTabItem) in a TabBar (TTTabBar). In one case, i want to remove the TabBarItem selection from any of the four TabBarItems (TTTabItem) . i.e., the complete TabBar will not show any TabBarItems selected. Can i achieve it? I tried the following, [_tabBar1 setSelectedTabItem:nil]; But it is crashing. Could someone guide me to resolve this? I need help urgently. (OR) If we clicked on one TabBarItem(TTTabItem), then again clicking on same TabBarItem(TTTabItem) will not call/execute anything right. Can i make it always clicking on a TabBarItem, should call "(void)tabBar: (UITabBar *)tabBar didSelectItem:(UITabBarItem *)item" (or) any other relevant system functions? I need your helps urgently, could someone guide me for my issue? Thank you.

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  • Why is iPhone 5 briefly Letterboxing and displaying Default.png in Cocos2d?

    - by The Learner
    I have [email protected] which loads fine. However, (on the actual device) after it shows the iPhone 5 then displays Default.png, in letter box mode. It then loads the 1136 × 640 px Title Screen - which is fine and what it's supposed to do. I'm using the default Cocos2d HelloWorld template. I haven't changed anything in the plist or otherwise. Any ideas? Why does it load the Default.png and how do you fix this? Thanks. In the IntroLayer we have -(void) onEnter if( UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone ) { background = [CCSprite spriteWithFile:@"Default.png"]; background.rotation = 90; } Which is why Default.png is showing up. How do you keep showing [email protected] if you are using the iPhone 5?

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  • algorithms that destruct and copy_construct

    - by FredOverflow
    I am currently building my own toy vector for fun, and I was wondering if there is something like the following in the current or next standard or in Boost? template<class T> void destruct(T* begin, T* end) { while (begin != end) { begin -> ~T(); ++begin; } } template<class T> T* copy_construct(T* begin, T* end, T* dst) { while (begin != end) { new(dst) T(*begin); ++begin; ++dst; } return dst; }

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