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  • UIAlertView popups lock up keyboard actions

    - by TurbZ
    I have a strange behavior where if a UIAlert fires (like the one below) all subsequent keyboard or press behaviors are disabled / non responsive. Scrolling the screen still works but no action is fired from any button or keyboard presses. [[[[UIAlertView alloc] initWithTitle:@"Invalid Address" message:@"The email address you entered isn't valid. Please check and try again." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease] show]; Anyone experienced this behavior before and can shed some light? Or maybe guide me in the right direction to debug it further to get to the root cause? Thank you heaps!

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  • Add a multiple buttons to a view programatically, call the same method, determine which button it wa

    - by just_another_coder
    I want to programatically add multiple UIButtons to a view - the number of buttons is unknown at compile time. I can make one or more UIButton's like so (in a loop, but shorted for simplicity): UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown]; [button setTitle:@"Button x" forState:UIControlStateNormal]; button.frame = CGRectMake(100.0, 100.0, 120.0, 50.0); [view addSubview:button]; Copied/Edited from this link: http://stackoverflow.com/questions/1378765/how-do-i-create-a-basic-uibutton-programmatically But how do I determine in buttonClicked: which button was clicked? I'd like to pass tag data if possible to identify the button.

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  • Sending NSMutableArray on AsycSocket

    - by user200654
    Any one knows how to write and read NSMutableArray or Dictionary data using AsycSocket Library ? Clarification: I want a way to archive NSMuatbleArray and write this on the stream. seemed pretty forward but running in simulator I get this wierd error [NSKeyedUnarchiver initForReadingWithData:]: incomprehensible archive

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  • An NSMutableArray that doesn't retain?

    - by synic
    A few UIViewControllers in my app that need to register with a "provider" class in their viewDidLoad methods. I've just been adding them to an NSMutableArray contained in the provider class. However, I don't want this NSMutableArray to keep them from being dealloc'ed, and I also want to have them remove themselves from the NSMutableArray in their dealloc methods. I tried just issuing a [self release] after adding them to the array, and this works, but in order to avoid a crash when they get dealloc'ed, I have to issue a [self retain] right before I remove them. It seems like I'm doing something horribly wrong by retaining an object in it's own dealloc method. Is there a better way to store these values?

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  • % operator for time calculation

    - by Chris
    I am trying to display minutes and seconds based on a number of seconds. I have: float seconds = 200; float mins = seconds / 60.0; float sec = mins % 60.0; [timeIndexLabel setText:[NSString stringWithFormat:@"%.2f , %.2f", mins,seconds]]; But I get an error: invalid operands of types 'float' and 'double' to binary 'operator%' And I don't understand why... Can someone throw me a bone!?

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  • NSUTF8StringEncoding gives me this %0A%20%20%20%20%22http://example.com/example.jpg%22%0A

    - by user1530141
    So I'm trying to load pictures from twitter. If i just use the URL in the json results without encoding, in the dataWithContentsOfURL, I get nil URL argument. If I encode it, I get %0A%20%20%20%20%22http://example.com/example.jpg%22%0A. I know I can use rangeOfString: or stringByReplacingOccurrencesOfString: but can I be sure that it will always be the same, is there another way to handle this, and why is this happening to my twitter response and not my instagram response? i have also tried stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet] and it does nothing. this is the url directly from the json... 2013-11-08 22:09:31:812 JaVu[1839:1547] -[SingleEventTableViewController tableView:cellForRowAtIndexPath:] [Line 406] ( "http://pbs.twimg.com/media/BYWHiq1IYAAwSCR.jpg" ) here is my code if ([post valueForKeyPath:@"entities.media.media_url"]) { NSString *twitterString = [[NSString stringWithFormat:@"%@", [post valueForKeyPath:@"entities.media.media_url"]]stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; twitterString = [twitterString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; NSLog(@"%@", twitterString); if (twitterString != nil){ NSURL *twitterPhotoUrl = [NSURL URLWithString:twitterString]; NSLog(@"%@", twitterPhotoUrl); dispatch_queue_t queue = kBgQueue; dispatch_async(queue, ^{ NSError *error; NSData* data = [NSData dataWithContentsOfURL:twitterPhotoUrl options:NSDataReadingUncached error:&error]; UIImage *image = [UIImage imageWithData:data]; dispatch_sync(dispatch_get_main_queue(), ^{ [streamPhotoArray replaceObjectAtIndex:indexPath.row withObject:image]; cell.instagramPhoto.image = image; }); }); } }

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  • How to make and use first object in Objective C to store sender tag

    - by dbonneville
    I started with a sample program that simply sets up a UIView with some buttons on it. Works great. I want to access the sender tag from each button and save it. My first thought was to save it to a global variable but I couldn't get it to work right. I thought the best way would be to create an object with one property and synthesize it so I can get or set it as needed. First, I created GlobalGem.h: #import <Foundation/Foundation.h> @interface GlobalGem : NSObject { int gemTag; } @property int gemTag; -(void) print; @end Then I created GlobalGem.m: #import "GlobalGem.h" @implementation GlobalGem @synthesize gemTag; -(void) print { NSLog(@"gemTag value is %i", gemTag); } @end The sample code I worked from doesn't do anything I can see in "main" where the program initializes. They just have their methods and are set up to handle IBOutlet actions. I want to use this object in the IBOutlet methods. But I don't know where to create the object. In the viewDidLoad, I tried this: GlobalGem *aGem = [[GlobalGem alloc]init]; [aGem print]; I added reference to the .h file of course. The print method works. In the nslog I get "gemTag value is 0". But now I want to use the instance aGem in some of the IBOutlet actions. For instance, if I put this same method in one of the outlet actions like this: - (IBAction)touchButton:(id)sender { [aGem print]; } ...I get a build error saying that "aGem is undeclared". Yes, I'm new to objective c and am very confused. Is the instance I created, aGem, in the viewDidLoad not accessible outside of that method? How would I create an instance of a Class that I can store a variable value that any of the IBOutlet methods can access? All the buttons need to be able to store their sender tag in the instance aGem and I'm stuck. As I mentioned earlier, I was able to write the sender tag to a global variable I declared in the UIView .h file that came with the program, but I ran into issues using it. Where am I off?

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  • Rewrite C++ code into Objective C

    - by Phil_M
    Hello I got some C++ Sourcecode that I would like to rewrite into Objective C. It would help me alot if someone could write me a header file for this Code. When I get the Headerfile I would be able to rewrite the rest of the Sourcecode. It would be very nice if someone could help me please. Thanks I will poste the sourcecode here: #include <stdlib.h> #include <iostream.h> #define STATES 5 int transitionTable[STATES][STATES]; // function declarations: double randfloat (void); int chooseNextEventFromTable (int current, int table[STATES][STATES]); int chooseNextEventFromTransitionTablee (int currentState); void setTable (int value, int table[STATES][STATES]); ////////////////////////////////////////////////////////////////////////// int main(void) { int i; // for demo purposes: transitionTable[0][0] = 0; transitionTable[0][1] = 20; transitionTable[0][2] = 30; transitionTable[0][3] = 50; transitionTable[0][4] = 0; transitionTable[1][0] = 35; transitionTable[1][1] = 25; transitionTable[1][2] = 20; transitionTable[1][3] = 30; transitionTable[1][4] = 0; transitionTable[2][0] = 70; transitionTable[2][1] = 0; transitionTable[2][2] = 15; transitionTable[2][3] = 0; transitionTable[2][4] = 15; transitionTable[3][0] = 0; transitionTable[3][1] = 25; transitionTable[3][2] = 25; transitionTable[3][3] = 0; transitionTable[3][4] = 50; transitionTable[4][0] = 13; transitionTable[4][1] = 17; transitionTable[4][2] = 22; transitionTable[4][3] = 48; transitionTable[4][4] = 0; int currentState = 0; for (i=0; i<10; i++) { std::cout << currentState << " "; currentState = chooseNextEventFromTransitionTablee(currentState); } return 0; }; ////////////////////////////////////////////////////////////////////////// ////////////////////////////// // // chooseNextEventFromTransitionTable -- choose the next note. // int chooseNextEventFromTransitionTablee(int currentState) { int targetSum = 0; int sum = 0; int targetNote = 0; int totalevents = 0; int i; currentState = currentState % STATES; // remove any octave value for (i=0; i<STATES; i++) { totalevents += transitionTable[currentState][i]; } targetSum = (int)(randfloat() * totalevents + 0.5); while (targetNote < STATES && sum+transitionTable[currentState][targetNote] < targetSum) { sum += transitionTable[currentState][targetNote]; targetNote++; } return targetNote; } ////////////////////////////// // // randfloat -- returns a random number between 0.0 and 1.0. // double randfloat(void) { return (double)rand()/RAND_MAX; } ////////////////////////////// // // setTable -- set all values in the transition table to the given value. // void setTable(int value, int table[STATES][STATES]) { int i, j; for (i=0; i<STATES; i++) { for (j=0; j<STATES; j++) { table[i][j] = value; } } }

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  • unrecognized selector sent to instance in xcode using objective c and sup as backend

    - by user1765037
    I am a beginner in native development.I made a project using xcode in objective C.It builded successfully.But when I run the project ,an error came like 'unrecognized selector sent to instance'.Why this is happening ?can anyone help me to solve this?I am attaching the error that I am getting with this.. And I am posting the code with this.... ConnectionController.m #import "ConnectionController.h" #import "SUPApplication.h" #import "Flight_DetailsFlightDB.h" #import "CallbackHandler.h" @interface ConnectionController() @property (nonatomic,retain)CallbackHandler *callbackhandler; @end @implementation ConnectionController @synthesize callbackhandler; static ConnectionController *appConnectionController; //Begin Application Setup +(void)beginApplicationSetup { if(!appConnectionController) { appConnectionController = [[[ConnectionController alloc]init]retain]; appConnectionController.callbackhandler = [[CallbackHandler getInstance]retain]; } if([SUPApplication connectionStatus] == SUPConnectionStatus_DISCONNECTED) [appConnectionController setupApplicationConnection]; else NSLog(@"Already Connected"); } -(BOOL)setupApplicationConnection { SUPApplication *app = [SUPApplication getInstance]; [app setApplicationIdentifier:@"HWC"]; [app setApplicationCallback:self.callbackhandler]; NSLog(@"inside setupApp"); SUPConnectionProperties *properties = [app connectionProperties]; NSLog(@"server"); [properties setServerName:@"sapecxxx.xxx.com"]; NSLog(@"inside setupAppser"); [properties setPortNumber:5001]; NSLog(@"inside setupApppot"); [properties setFarmId:@"0"]; NSLog(@"inside setupAppfarm"); [properties setUrlSuffix:@"/tm/?cid=%cid%"]; NSLog(@"inside setupAppurlsuff"); [properties setNetworkProtocol:@"http"]; SUPLoginCredentials *loginCred = [SUPLoginCredentials getInstance]; NSLog(@"inside setupAppmac"); [loginCred setUsername:@"mac"]; [loginCred setPassword:nil]; [properties setLoginCredentials:loginCred]; [properties setActivationCode:@"1234"]; if(![Flight_DetailsFlightDB databaseExists]) { [Flight_DetailsFlightDB createDatabase]; } SUPConnectionProfile *connprofile = [Flight_DetailsFlightDB getSynchronizationProfile]; [connprofile setNetworkProtocol:@"http"]; NSLog(@"inside setupAppPort2"); [connprofile setPortNumber:2480]; NSLog(@"inside setupAppser2"); [connprofile setServerName:@"sapecxxx.xxx.com"]; NSLog(@"inside setupAppdom2"); [connprofile setDomainName:@"Development"]; NSLog(@"inside setupAppuser"); [connprofile setUser:@"supAdmin"]; [connprofile setPassword:@"s3pAdmin"]; [connprofile setAsyncReplay:YES]; [connprofile setClientId:@"0"]; // [Flight_DetailsFlightDB beginOnlineLogin:@"supAdmin" password:@"s3pAdmin"]; [Flight_DetailsFlightDB registerCallbackHandler:self.callbackhandler]; [Flight_DetailsFlightDB setApplication:app]; if([SUPApplication connectionStatus] == SUPRegistrationStatus_REGISTERED) { [app startConnection:0]; } else { [app registerApplication:0]; } } @end ViewController.m #import "Demo_FlightsViewController.h" #import "ConnectionController.h" #import "Flight_DetailsFlightDB.h" #import "SUPObjectList.h" #import "Flight_DetailsSessionPersonalization.h" #import "Flight_DetailsFlight_MBO.h" #import "Flight_DetailsPersonalizationParameters.h" @interface Demo_FlightsViewController () @end @implementation Demo_FlightsViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. } -(IBAction)Connect:(id)sender { @try { [ConnectionController beginApplicationSetup]; } @catch (NSException *exception) { NSLog(@"ConnectionAborted"); } // synchronise } -(IBAction)Synchronise:(id)sender { @try { [Flight_DetailsFlightDB synchronize]; NSLog(@"SYNCHRONISED"); } @catch (NSException *exception) { NSLog(@"Synchronisation Failed"); } } -(IBAction)findall:(id)sender { SUPObjectList *list = [Flight_DetailsSessionPersonalization findAll]; NSLog(@"no of lines got synchronised is %d",list.size); } -(IBAction)confirm:(id)sender { Flight_DetailsPersonalizationParameters *pp = [Flight_DetailsFlightDB getPersonalizationParameters]; MBOLogInfo(@"personalisation parmeter for airline id= %@",pp.Airline_PK); [pp setAirline_PK:@"AA"]; [pp save]; while([Flight_DetailsFlightDB hasPendingOperations]) { [NSThread sleepForTimeInterval:1]; } NSLog(@"inside confirm............"); [Flight_DetailsFlightDB beginSynchronize]; Flight_DetailsFlight_MBO *flight = nil; SUPObjectList *cl = nil; cl =[Flight_DetailsFlight_MBO findAll]; if(cl && cl.length > 0) { int i; for(i=0;i<cl.length;i++) { flight = [cl item:i]; if(flight) { NSLog(@"details are %@",flight.CITYFROM); } } } } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); } @end SUPConnectionProfile.h #import "sybase_sup.h" #define FROM_IMPORT_THREAD TRUE #define FROM_APP_THREAD FALSE #define SUP_UL_MAX_CACHE_SIZE 10485760 @class SUPBooleanUtil; @class SUPNumberUtil; @class SUPStringList; @class SUPStringUtil; @class SUPPersistenceException; @class SUPLoginCertificate; @class SUPLoginCredentials; @class SUPConnectionProfile; /*! @class SUPConnectionProfile @abstract This class contains fields and methods needed to connect and authenticate to an SUP server. @discussion */ @interface SUPConnectionProfile : NSObject { SUPConnectionProfile* _syncProfile; SUPBoolean _threadLocal; SUPString _wrapperData; NSMutableDictionary* _delegate; SUPLoginCertificate* _certificate; SUPLoginCredentials* _credentials; int32_t _maxDbConnections; BOOL initTraceCalled; } /*! @method @abstract Return a new instance of SUPConnectionProfile. @discussion @result The SUPconnectionprofile object. */ + (SUPConnectionProfile*)getInstance; /*! @method @abstract Return a new instance of SUPConnectionProfile. @discussion This method is deprecated. use getInstance instead. @result The SUPconnectionprofile object. */ + (SUPConnectionProfile*)newInstance DEPRECATED_ATTRIBUTE NS_RETURNS_NON_RETAINED; - (SUPConnectionProfile*)init; /*! @property @abstract The sync profile. @discussion */ @property(readwrite, retain, nonatomic) SUPConnectionProfile* syncProfile; /*! @property @abstract The maximum number of active DB connections allowed @discussion Default value is 4, but can be changed by application developer. */ @property(readwrite, assign, nonatomic) int32_t maxDbConnections; /*! @method @abstract The SUPConnectionProfile manages an internal dictionary of key value pairs. This method returns the SUPString value for a given string. @discussion @param name The string. */ - (SUPString)getString:(SUPString)name; /*! @method @abstract The SUPConnectionProfile manages an internal dictionary of key value pairs. This method returns the SUPString value for a given string. If the value is not found, returns 'defaultValue'. @discussion @param name The string. @param defaultValue The default Value. */ - (SUPString)getStringWithDefault:(SUPString)name:(SUPString)defaultValue; /*! @method @abstract The SUPConnectionProfile manages an internal dictionary of key value pairs. This method returns the SUPBoolean value for a given string. @discussion @param name The string. */ - (SUPBoolean)getBoolean:(SUPString)name; /*! @method @abstract The SUPConnectionProfile manages an internal dictionary of key value pairs. This method returns the SUPBoolean value for a given string. If the value is not found, returns 'defaultValue'. @discussion @param name The string. @param defaultValue The default Value. */ - (SUPBoolean)getBooleanWithDefault:(SUPString)name:(SUPBoolean)defaultValue; /*! @method @abstract The SUPConnectionProfile manages an internal dictionary of key value pairs. This method returns the SUPInt value for a given string. @discussion @param name The string. */ - (SUPInt)getInt:(SUPString)name; /*! @method @abstract The SUPConnectionProfile manages an internal dictionary of key value pairs. This method returns the SUPInt value for a given string. If the value is not found, returns 'defaultValue'. @discussion @param name The string. @param defaultValue The default Value. */ - (SUPInt)getIntWithDefault:(SUPString)name:(SUPInt)defaultValue; /*! @method getUPA @abstract retrieve upa from profile @discussion if it is in profile's dictionary, it returns value for key "upa"; if it is not found in profile, it composes the upa value from base64 encoding of username:password; and also inserts it into profile's dictionary. @param none @result return string value of upa. */ - (SUPString)getUPA; /*! @method @abstract Sets the SUPString 'value' for the given 'name'. @discussion @param name The name. @param value The value. */ - (void)setString:(SUPString)name:(SUPString)value; /*! @method @abstract Sets the SUPBoolean 'value' for the given 'name'. @discussion @param name The name. @param value The value. */ - (void)setBoolean:(SUPString)name:(SUPBoolean)value; /*! @method @abstract Sets the SUPInt 'value' for the given 'name'. @discussion @param name The name. @param value The value. */ - (void)setInt:(SUPString)name:(SUPInt)value; /*! @method @abstract Sets the username. @discussion @param value The value. */ - (void)setUser:(SUPString)value; /*! @method @abstract Sets the password. @discussion @param value The value. */ - (void)setPassword:(SUPString)value; /*! @method @abstract Sets the ClientId. @discussion @param value The value. */ - (void)setClientId:(SUPString)value; /*! @method @abstract Returns the databasename. @discussion @param value The value. */ - (SUPString)databaseName; /*! @method @abstract Sets the databasename. @discussion @param value The value. */ - (void)setDatabaseName:(SUPString)value; @property(readwrite,copy, nonatomic) SUPString databaseName; /*! @method @abstract Gets the encryption key. @discussion @result The encryption key. */ - (SUPString)getEncryptionKey; /*! @method @abstract Sets the encryption key. @discussion @param value The value. */ - (void)setEncryptionKey:(SUPString)value; @property(readwrite,copy, nonatomic) SUPString encryptionKey; /*! @property @abstract The authentication credentials (username/password or certificate) for this profile. @discussion */ @property(retain,readwrite,nonatomic) SUPLoginCredentials *credentials; /*! @property @abstract The authentication certificate. @discussion If this is not null, certificate will be used for authentication. If this is null, credentials property (username/password) will be used. */ @property(readwrite,retain,nonatomic) SUPLoginCertificate *certificate; @property(readwrite, assign, nonatomic) BOOL initTraceCalled; /*! @method @abstract Gets the UltraLite collation creation parameter @discussion @result conllation string */ - (SUPString)getCollation; /*! @method @abstract Sets the UltraLite collation creation parameter @discussion @param value The value. */ - (void)setCollation:(SUPString)value; @property(readwrite,copy, nonatomic) SUPString collation; /*! @method @abstract Gets the maximum cache size in bytes; the default value for iOS is 10485760 (10 MB). @discussion @result max cache size */ - (int)getCacheSize; /*! @method @abstract Sets the maximum cache size in bytes. @discussion For Ultralite, passes the cache_max_size property into the connection parameters for DB connections; For SQLite, executes the "PRAGMA cache_size" statement when a connection is opened. @param cacheSize value */ - (void)setCacheSize:(int)cacheSize; @property(readwrite,assign, nonatomic) int cacheSize; /*! @method @abstract Returns the user. @discussion @result The username. */ - (SUPString)getUser; /*! @method @abstract Returns the password hash value. @discussion @result The password hash value. */ - (NSUInteger)getPasswordHash; /*! @method @abstract Returns the password. @discussion @result The password hash value. */ - (NSString*)getPassword; /*! @method @abstract Adds a new key value pair. @discussion @param key The key. @param value The value. */ - (void)add:(SUPString)key:(SUPString)value; /*! @method @abstract Removes the key. @discussion @param key The key to remove. */ - (void)remove:(SUPString)key; - (void)clear; /*! @method @abstract Returns a boolean indicating if the key is present. @discussion @param key The key. @result The result indicating if the key is present. */ - (SUPBoolean)containsKey:(SUPString)key; /*! @method @abstract Returns the item for the given key. @discussion @param key The key. @result The item. */ - (SUPString)item:(SUPString)key; /*! @method @abstract Returns the list of keys. @discussion @result The keylist. */ - (SUPStringList*)keys; /*! @method @abstract Returns the list of values. @discussion @result The value list. */ - (SUPStringList*)values; /*! @method @abstract Returns the internal map of key value pairs. @discussion @result The NSMutableDictionary with key value pairs. */ - (NSMutableDictionary*)internalMap; /*! @method @abstract Returns the domain name. @result The domain name. @discussion */ - (SUPString)getDomainName; /*! @method @abstract Sets the domain name. @param value The domain name. @discussion */ - (void)setDomainName:(SUPString)value; /*! @method @abstract Get async operation replay property. Default is true. @result YES : if ansync operation replay is enabled; NO: if async operation is disabled. @discussion */ - (BOOL) getAsyncReplay; /*! @method @abstract Set async operation replay property. Default is true. @result value: enable/disable async replay operation. @discussion */ - (void) setAsyncReplay:(BOOL) value; /*! @method @abstract enable or disable the trace in client object API. @param enable - YES: enable the trace; NO: disable the trace. @discussion */ - (void)enableTrace:(BOOL)enable; /*! @method @abstract enable or disable the trace with payload info in client object API. @param enable - YES: enable the trace; NO: disable the trace. @param withPayload = YES: show payload information; NO: not show payload information. @discussion */ - (void)enableTrace:(BOOL)enable withPayload:(BOOL)withPayload; /*! @method @abstract initialize trace levels from server configuration. @discussion */ - (void)initTrace; - (void)dealloc; /* ultralite/mobilink required parameters */ - (SUPString)getNetworkProtocol; - (void)setNetworkProtocol:(SUPString)protocol; - (SUPString)getNetworkStreamParams; - (void)setNetworkStreamParams:(SUPString)stream; - (SUPString)getServerName; - (void)setServerName:(SUPString)name; - (int)getPortNumber; - (void)setPortNumber:(int)port; - (int)getPageSize; - (void)setPageSize:(int)size; @end @interface SUPConnectionProfile(internal) - (void)applyPropertiesFromApplication; @end We are using SUP 2.1.3 library files.Please go through the code and help me...

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  • TIOBE : Objective-C plus populaire que C++, le langage d'Apple entre dans le top 3 du classement

    TIOBE : Objective-C plus populaire que C++ le langage d'Apple entre dans le top 3 du classement Mise à jour du 03/07/2012 La popularité de l'iPhone et de l'iPad se fait ressentir sur l'indice Tiobe pour le mois de juillet. Le classement des langages les plus populaires par Tiobe au cours de cette période montre une hausse considérable de la part de marché de l'Objective-C, déclassant ainsi C++. Le langage de programmation d'Apple pour ses dispositifs sous iOS entre dans le top trois des langages les plus populaires avec une part de 9,33 %, en hausse de 4,14 % par rapport à la même période de l'an dernie...

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  • These are few objective type questions which i was not able to find the solution [closed]

    - by Tarun
    1. Which of the following advantages does System.Collections.IDictionaryEnumerator provide over System.Collections.IEnumerator? a. It adds properties for direct access to both the Key and the Value b. It is optimized to handle the structure of a Dictionary. c. It provides properties to determine if the Dictionary is enumerated in Key or Value order d. It provides reverse lookup methods to distinguish a Key from a specific Value 2. When Implementing System.EnterpriseServices.ServicedComponent derived classes, which of the following statements are true? a. Enabling object pooling requires an attribute on the class and the enabling of pooling in the COM+ catalog. b. Methods can be configured to automatically mark a transaction as complete by the use of attributes. c. You can configure authentication using the AuthenticationOption when the ActivationMode is set to Library. d. You can control the lifecycle policy of an individual instance using the SetLifetimeService method. 3. Which of the following are true regarding event declaration in the code below? class Sample { event MyEventHandlerType MyEvent; } a. MyEventHandlerType must be derived from System.EventHandler or System.EventHandler<TEventArgs> b. MyEventHandlerType must take two parameters, the first of the type Object, and the second of a class derived from System.EventArgs c. MyEventHandlerType may have a non-void return type d. If MyEventHandlerType is a generic type, event declaration must use a specialization of that type. e. MyEventHandlerType cannot be declared static 4. Which of the following statements apply to developing .NET code, using .NET utilities that are available with the SDK or Visual Studio? a. Developers can create assemblies directly from the MSIL Source Code. b. Developers can examine PE header information in an assembly. c. Developers can generate XML Schemas from class definitions contained within an assembly. d. Developers can strip all meta-data from managed assemblies. e. Developers can split an assembly into multiple assemblies. 5. Which of the following characteristics do classes in the System.Drawing namespace such as Brush,Font,Pen, and Icon share? a. They encapsulate native resource and must be properly Disposed to prevent potential exhausting of resources. b. They are all MarshalByRef derived classes, but functionality across AppDomains has specific limitations. c. You can inherit from these classes to provide enhanced or customized functionality 6. Which of the following are required to be true by objects which are going to be used as keys in a System.Collections.HashTable? a. They must handle case-sensitivity identically in both the GetHashCode() and Equals() methods. b. Key objects must be immutable for the duration they are used within a HashTable. c. Get HashCode() must be overridden to provide the same result, given the same parameters, regardless of reference equalityl unless the HashTable constructor is provided with an IEqualityComparer parameter. d. Each Element in a HashTable is stored as a Key/Value pair of the type System.Collections.DictionaryElement e. All of the above 7. Which of the following are true about Nullable types? a. A Nullable type is a reference type. b. A Nullable type is a structure. c. An implicit conversion exists from any non-nullable value type to a nullable form of that type. d. An implicit conversion exists from any nullable value type to a non-nullable form of that type. e. A predefined conversion from the nullable type S? to the nullable type T? exists if there is a predefined conversion from the non-nullable type S to the non-nullable type T 8. When using an automatic property, which of the following statements is true? a. The compiler generates a backing field that is completely inaccessible from the application code. b. The compiler generates a backing field that is a private instance member with a leading underscore that can be programmatically referenced. c. The compiler generates a backing field that is accessible via reflection d. The compiler generates a code that will store the information separately from the instance to ensure its security. 9. Which of the following does using Initializer Syntax with a collection as shown below require? CollectionClass numbers = new CollectionClass { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; a. The Collection Class must implement System.Collections.Generic.ICollection<T> b. The Collection Class must implement System.Collections.Generic.IList<T> c. Each of the Items in the Initializer List will be passed to the Add<T>(T item) method d. The items in the initializer will be treated as an IEnumerable<T> and passed to the collection constructor+K110 10. What impact will using implicitly typed local variables as in the following example have? var sample = "Hello World"; a. The actual type is determined at compilation time, and has no impact on the runtime b. The actual type is determined at runtime, and late binding takes effect c. The actual type is based on the native VARIANT concept, and no binding to a specific type takes place. d. "var" itself is a specific type defined by the framework, and no special binding takes place 11. Which of the following is not supported by remoting object types? a. well-known singleton b. well-known single call c. client activated d. context-agile 12. In which of the following ways do structs differ from classes? a. Structs can not implement interfaces b. Structs cannot inherit from a base struct c. Structs cannot have events interfaces d. Structs cannot have virtual methods 13. Which of the following is not an unboxing conversion? a. void Sample1(object o) { int i = (int)o; } b. void Sample1(ValueType vt) { int i = (int)vt; } c. enum E { Hello, World} void Sample1(System.Enum et) { E e = (E) et; } d. interface I { int Value { get; set; } } void Sample1(I vt) { int i = vt.Value; } e. class C { public int Value { get; set; } } void Sample1(C vt) { int i = vt.Value; } 14. Which of the following are characteristics of the System.Threading.Timer class? a. The method provided by the TimerCallback delegate will always be invoked on the thread which created the timer. b. The thread which creates the timer must have a message processing loop (i.e. be considered a UI thread) c. The class contains protection to prevent reentrancy to the method provided by the TimerCallback delegate d. You can receive notification of an instance being Disposed by calling an overload of the Dispose method. 15. What is the proper declaration of a method which will handle the following event? Class MyClass { public event EventHandler MyEvent; } a. public void A_MyEvent(object sender, MyArgs e) { } b. public void A_MyEvent(object sender, EventArgs e) { } c. public void A_MyEvent(MyArgs e) { } d. public void A_MyEvent(MyClass sender,EventArgs e) { } 16. Which of the following scenarios are applicable to Window Workflow Foundation? a. Document-centric workflows b. Human workflows c. User-interface page flows d. Builtin support for communications across multiple applications and/or platforms e. All of the above 17. When using an automatic property, which of the following statements is true? a. The compiler generates a backing field that is completely inaccessible from the application code. b. The compiler generates a backing field that is a private instance member with a leading underscore that can be programmatically referenced. c. The compiler generates a backing field that is accessible via reflection d. The compiler generates a code that will store the information separately from the instance to ensure its security. 18 While using the capabilities supplied by the System.Messaging classes, which of the following are true? a. Information must be explicitly converted to/from a byte stream before it uses the MessageQueue class b. Invoking the MessageQueue.Send member defaults to using the System.Messaging.XmlMessageFormatter to serialize the object. c. Objects must be XMLSerializable in order to be transferred over a MessageQueue instance. d. The first entry in a MessageQueue must be removed from the queue before the next entry can be accessed e. Entries removed from a MessageQueue within the scope of a transaction, will be pushed back into the front of the queue if the transaction fails. 19. Which of the following are true about declarative attributes? a. They must be inherited from the System.Attribute. b. Attributes are instantiated at the same time as instances of the class to which they are applied. c. Attribute classes may be restricted to be applied only to application element types. d. By default, a given attribute may be applied multiple times to the same application element. 20. When using version 3.5 of the framework in applications which emit a dynamic code, which of the following are true? a. A Partial trust code can not emit and execute a code b. A Partial trust application must have the SecurityCriticalAttribute attribute have called Assert ReflectionEmit permission c. The generated code no more permissions than the assembly which emitted it. d. It can be executed by calling System.Reflection.Emit.DynamicMethod( string name, Type returnType, Type[] parameterTypes ) without any special permissions Within Windows Workflow Foundation, Compensating Actions are used for: a. provide a means to rollback a failed transaction b. provide a means to undo a successfully committed transaction later c. provide a means to terminate an in process transaction d. achieve load balancing by adapting to the current activity 21. What is the proper declaration of a method which will handle the following event? Class MyClass { public event EventHandler MyEvent; } a. public void A_MyEvent(object sender, MyArgs e) { } b. public void A_MyEvent(object sender, EventArgs e) { } c. public void A_MyEvent(MyArgs e) { } d. public void A_MyEvent(MyClass sender,EventArgs e) { } 22. Which of the following controls allows the use of XSL to transform XML content into formatted content? a. System.Web.UI.WebControls.Xml b. System.Web.UI.WebControls.Xslt c. System.Web.UI.WebControls.Substitution d. System.Web.UI.WebControls.Transform 23. To which of the following do automatic properties refer? a. You declare (explicitly or implicitly) the accessibility of the property and get and set accessors, but do not provide any implementation or backing field b. You attribute a member field so that the compiler will generate get and set accessors c. The compiler creates properties for your class based on class level attributes d. They are properties which are automatically invoked as part of the object construction process 24. Which of the following are true about Nullable types? a. A Nullable type is a reference type. b. An implicit conversion exists from any non-nullable value type to a nullable form of that type. c. A predefined conversion from the nullable type S? to the nullable type T? exists if there is a predefined conversion from the non-nullable type S to the non-nullable type T 25. When using an automatic property, which of the following statements is true? a. The compiler generates a backing field that is completely inaccessible from the application code. b. The compiler generates a backing field that is accessible via reflection. c. The compiler generates a code that will store the information separately from the instance to ensure its security. 26. When using an implicitly typed array, which of the following is most appropriate? a. All elements in the initializer list must be of the same type. b. All elements in the initializer list must be implicitly convertible to a known type which is the actual type of at least one member in the initializer list c. All elements in the initializer list must be implicitly convertible to common type which is a base type of the items actually in the list 27. Which of the following is false about anonymous types? a. They can be derived from any reference type. b. Two anonymous types with the same named parameters in the same order declared in different classes have the same type. c. All properties of an anonymous type are read/write. 28. Which of the following are true about Extension methods. a. They can be declared either static or instance members b. They must be declared in the same assembly (but may be in different source files) c. Extension methods can be used to override existing instance methods d. Extension methods with the same signature for the same class may be declared in multiple namespaces without causing compilation errors

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  • Consume WCF Web Service in Objective-C on an iPhone

    - by JWD
    I am having a hard time consuming a very simple (Hello World) WCF web service in my iPhone app. From what I have read, you must manually create the request message then send it to the web service URL. I was able to accomplish this on a .asmx web service, but not with a WCF service. How do I know the correct format of the request SOAP message? The web service I am trying to hit has a format of: http://xxx.xxx.xxx.xxx:PORT/IService1/ (running locally in a VM) I apologize for the lack of information, I am pretty lost. Any and all help is much appreciated. Thanks in advance!

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  • Having problems with uploading photos to TwitPic using OAuth in Objective C on the iPhone

    - by M. Bedi
    I have been working on an iPhone app that has a feature of uploading photos to TwitPic. I have it working with basic authentication. I am trying to get it working with OAuth. I am getting authentication errors. I have studied very carefully the TwitPic documentation. I am authorising the app by displaying a UI Web View and the it returns a PIN value. I enter the PIN value in the app and request the token. I am able to upload status updates to Twitter but not photos. My code is based on some example code from here: Example iPhone app using OAuth Here is my code: NSString *url = @"http://api.twitpic.com/2/upload.json"; NSString *oauth_header = [oAuth oAuthHeaderForMethod:@"POST" andUrl:url andParams:nil]; NSLog(@"OAuth header : %@\n\n", oauth_header); ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:url]]; [request addRequestHeader:@"User-Agent" value:@"ASIHTTPRequest"]; request.requestMethod = @"POST"; [request addRequestHeader:@"X-Auth-Service-Provider" value:@"https://api.twitter.com/1/account/verify_credentials.json"]; [request addRequestHeader:@"X-Verify-Credentials-Authorization" value:oauth_header]; NSData *imageRepresentation = UIImageJPEGRepresentation(imageToUpload, 0.8); [request setData:imageRepresentation forKey:@"media"]; [request setPostValue:@"Some Message" forKey:@"message"]; [request setPostValue:TWITPIC_API_KEY forKey:@"key"]; [request setDelegate:self]; [request setDidFinishSelector:@selector(requestDone:)]; [request setDidFailSelector:@selector(requestFailed:)]; [request start]; Here is the OAuth Header: OAuth realm="http://api.twitter.com/", oauth_timestamp="1275492425", oauth_nonce="b686f20a18ba6763ac52b689b2ac0c421a9e4013", oauth_signature_method="HMAC-SHA1", oauth_consumer_key="zNbW3Xi3MuS7i9cpz6fw", oauth_version="1.0", oauth_token="147275699-jmrjpwk3B6mO2FX2BCc9Ci9CRBbBKYW1bOni2MYs", oauth_signature="d17HImz6VgygZgbcp845CD2qNnI%3D"

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  • Sound File editing in Objective C

    - by Biranchi
    Hi All, I am able to record and create audio files using AudioFileCreateWithURL in the AudioToolbox Framework. I want to figure out if there is any way to edit the .caf sound files. I want to insert another recoreded audio inside the main audio file. Any thoughts or suggestions how to proceed ?? Thanks.

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  • Need help looping through text file in Objective-C and looping through multidimensional array of dat

    - by Fulvio
    I have a question regarding an iPhone game I'm developing. At the moment, below is the code I'm using to currently I loop through my multidimensional array and position bricks accordingly on my scene. Instead of having multiple two dimensional arrays within my code as per the following (gameLevel1). Ideally, I'd like to read from a text file within my project and loop through the values in that instead. Please take into account that I'd like to have more than one level within my game (possibly 20) so my text file would have to have some sort of separator line item to determine what level I want to render. I was then thinking of having some sort of method that I call and that method would take the level number I'm interested in rendering. e.g. Method to call level based on separator? -(void)renderLevel:(NSString) levelNumber; e.g. Text file example? #LEVEL_ONE# 0,0,0,0,0,0,0,0,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,1,1,1,1,1,1,1,0 0,0,0,0,0,0,0,0,0 #LEVEL_TWO# 1,0,0,0,0,0,0,0,1 1,1,1,1,1,1,1,1,1 1,1,1,1,1,1,1,1,1 1,1,1,1,1,1,1,1,1 1,1,1,1,1,1,1,1,1 0,1,1,1,1,1,1,1,0 1,1,1,1,1,1,1,1,1 0,1,1,1,1,1,1,1,0 1,1,1,1,1,1,1,1,1 0,1,1,1,1,1,1,1,0 1,1,1,1,1,1,1,1,1 0,1,1,1,1,1,1,1,0 1,1,1,1,1,1,1,1,1 1,1,1,1,1,1,1,1,1 1,1,1,1,1,1,1,1,1 1,1,1,1,1,1,1,1,1 1,0,0,0,0,0,0,0,1 Code that I'm currently using: int gameLevel[17][9] = { { 0,0,0,0,0,0,0,0,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,1,1,1,1,1,1,1,0 }, { 0,0,0,0,0,0,0,0,0 } }; for (int row=0; row < 17; row++) { for (int col=0; col < 9; col++) { thisBrickValue = gameLevel[row][col]; xOffset = 35 * floor(col); yOffset = 22 * floor(row); switch (thisBrickValue) { case 0: brick = [[CCSprite spriteWithFile:@"block0.png"] autorelease]; break; case 1: brick = [[CCSprite spriteWithFile:@"block1.png"] autorelease]; break; } brick.position = ccp(xOffset, yOffset); [self addChild:brick]; } }

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  • Cocoa/Objective-C - Child window with text input without main window becoming inactive

    - by Josh
    Hello All, I have a need to spawn a window that will hover just above my main window in a cocoa application. I want this main window to allow the user to enter some text in an input box. All is well until the text input box actually gains focus. The main window becomes "deactivated." This window is borderless and is a slightly custom shape -- its more like a hover card than anything else, I suppose. Basically, I'd like this thing to work almost exactly like Spotlight (Apple + Space) -- you can enter text, but this is such an an ancillary operation that in the context of the greater UX, you don't want the jarring effect of the main window graying out (becoming inactive). You'll notice when you have some application open and in-focus, spotlight will not cause the window of that application to become inactive. This problem arises because text input seems to REQUIRE that the child window become the key window (it will not let you place the cursor in the text input field). When it becomes key, the main window becomes inactive. So far I've tried: Subclassing NSWindow for my main application and overriding isKeyWindow such that it only loses key when the application is no longer the users focus (as opposed to the window). This had the unintended effect of colliding with key status of the child window and having very strange effects on the keyboard input (some keys are not captured, like delete) Creating a view instead of a window. Doesn't work because of this problem -- you cannot draw over a Webkit WebView these days. Anybody Cocoa/OSX wizards have any ideas? I've become a little obsessed with this one. An itch I can't scratch.

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  • reorder NSArray in objective-c

    - by Jonathan
    I have an NSArray of JSON file locations. There are stored in the user's/app's Document directory and inside each JSON file is a name value. I'm able to retreive the data from JSON files, I don't need help with tht. But I need help on sorting NSArrays I have no idea how I can do that based on a value inside the file, while not being pathetically slow. This is on the iPhone btw. In sum how do I customly reorder NSArrays.

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  • Looking for advice on importing large dataset in sqlite and Cocoa/Objective-C

    - by jluckyiv
    I have a fairly large hierarchical dataset I'm importing. The total size of the database after import is about 270MB in sqlite. My current method works, but I know I'm hogging memory as I do it. For instance, if I run with Zombies, my system freezes up (although it will execute just fine if I don't use that Instrument). I was hoping for some algorithm advice. I have three hierarchical tables comprising about 400,000 records. The highest level has about 30 records, the next has about 20,000, the last has the balance. Right now, I'm using nested for loops to import. I know I'm creating an unreasonably large object graph, but I'm also looking to serialize to JSON or XML because I want to break up the records into downloadable chunks for the end user to import a la carte. I have the code written to do the serialization, but I'm wondering if I can serialize the object graph if I only have pieces in memory. Here's pseudocode showing the basic process for sqlite import. I left out the unnecessary detail. [database open]; [database beginTransaction]; NSArray *firstLevels = [[FirstLevel fetchFromURL:url retain]; for (FirstLevel *firstLevel in firstLevels) { [firstLevel save]; int id1 = [firstLevel primaryKey]; NSArray *secondLevels = [[SecondLevel fetchFromURL:url] retain]; for (SecondLevel *secondLevel in secondLevels) { [secondLevel saveWithForeignKey:id1]; int id2 = [secondLevel primaryKey]; NSArray *thirdLevels = [[ThirdLevel fetchFromURL:url] retain]; for (ThirdLevel *thirdLevel in thirdLevels) { [thirdLevel saveWithForeignKey:id2]; } [database commit]; [database beginTransaction]; [thirdLevels release]; } [secondLevels release]; } [database commit]; [database release]; [firstLevels release];

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  • Wordpress XML-RPC call from Objective C: wp.newComment

    - by radesix
    I'm using Eric Czarny's Cocoa XML-RPC framework to make a call to the Wordpress API's. I've downloaded the sample app from Wordpress which gives some good examples. Unfortunately the good examples are for every call EXCEPT wp.newComment. I'm trying to post a comment using the code below and I keep getting an error with a localized description that tells me to check my input parameters. I've checked and rechecked and I don't understand what is wrong. Any ideas? NSDictionary *commentStructure = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:0], @"comment_parent", @"xmlrpc anonymous comments plugin now enabled", @"content", @"Test Author", @"author", @"http://iphone.someurl.com", @"author_url", @"[email protected]", @"author_email", nil]; NSArray *args = [NSArray arrayWithObjects:[NSNumber numberWithInt:0], @"", @"", [NSNumber numberWithInt:[self.parentFeedItem.postID intValue]], commentStructure, nil]; // the param(s) NSString *server = [[[NSString alloc] initWithString:@"http://www.someurl.com/xmlrpc.php"] autorelease]; // the server NSString *method = [[[NSString alloc] initWithString:@"wp.newComment"] autorelease]; // the method XMLRPCRequest *request = [[XMLRPCRequest alloc] initWithHost:[NSURL URLWithString:server]]; [request setMethod:method withObjects:args]; id response = [self executeXMLRPCRequest:request]; [request release]; if( [response isKindOfClass:[NSError class]] ) { //return nil; NSLog(@"There was a problem"); NSLog([response localizedDescription]); }

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