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  • Serialize an object using DataContractJsonSerializer as a json array

    - by rekna
    I have a class which contains a list of items. I want to serialize an instance of this class to json using the DataContractJsonSerializer as a json array. eg. class MyClass { List<MyItem> _items; } class MyItem { public string Name {get;set;} public string Description {get;set;} } When serialized to json it should be like this : [{"Name":"one","Description":"desc1"},{"Name":"two","Description":"desc2"}]

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  • Error-invalid length for a base-64 char array

    - by dmenaria
    Hi , I have silverlight app that post some data to another web application ,the data to post is converted to base 64 using code byte[] byteArray = Encoding.UTF8.GetBytes(sDataToPost); sDataToPost = Convert.ToBase64String(byteArray); Another webapplication get the data using the code strText = System.Text.Encoding.ASCII.GetString(System.Convert.FromBase64String(postedData)); But it gives the exception invalid length for a base-64 char array Thanks in Advance DNM

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  • efficiently convert string (or tuple) to ctypes array

    - by Mu Mind
    I've got code that takes a PIL image and converts it to a ctypes array to pass out to a C function: w_px, h_px = img.size pixels = struct.unpack('%dI'%(w_px*h_px), img.convert('RGBA').tostring()) pixels_array = (ctypes.c_int * len(pixels))(*pixels) But I'm dealing with big images, and unpacking that many items into function arguments seems to be noticeably slow. What's the simplest thing I can do to get a reasonable speedup? I'm only converting to a tuple as an intermediate step, so if it's unnecessary, all the better.

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  • Android pass a 2d int array from one activity to another ERROR

    - by user2189001
    ACTIVITY 1: Bundle bundle = new Bundle(); bundle.putSerializable("CustomLevelData", LevelCreator.LCLevelData); Intent i = new Intent(LevelCreatorPopout.this, GameView.class); i.putExtras(bundle); startActivity(i); ACTIVITY 2: LevelData=(int[][]) extras.getSerializable("CustomLevelData"); ERROR: E/AndroidRuntime(16220): FATAL EXCEPTION: main E/AndroidRuntime(16220): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.powerpoint45.maze/com.powerpoint45.maze.GameView}: java.lang.ClassCastException: java.lang.Object[] cannot be cast to int[][] I have searched but found nothing on 2d INT array passing

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  • Return the Largest Span in a given Array -Core Java and Arrays Question

    - by Deepak
    Hi Stack People, Merry Christmas and hope you are in great Spirits,I have a Question in Java-Arrays as shown below.Im stuck up with this struggling to get it rite. Consider the leftmost and righmost appearances of some value in an array. We'll say that the "span" is the number of elements between the two inclusive. A single value has a span of 1. Write a **Java Function** that returns the largest span found in the given array. **Example: maxSpan({1, 2, 1, 1, 3}) ? 4,answer is 4 coz MaxSpan between 1 to 1 is 4 maxSpan({1, 4, 2, 1, 4, 1, 4}) ? 6,answer is 6 coz MaxSpan between 4 to 4 is 6 maxSpan({1, 4, 2, 1, 4, 4, 4}) ? 6,answer is 6 coz Maxspan between 4 to 4 is 6 which is greater than MaxSpan between 1 and 1 which is 4,Hence 64 answer is 6. I have the code which is not working,it includes all the Spans for a given element,im unable to find the MaxSpan for a given element. Please help me out. Results of the above Program are as shown below Expected This Run maxSpan({1, 2, 1, 1, 3}) ? 4 5 X maxSpan({1, 4, 2, 1, 4, 1, 4}) ? 6 8 X maxSpan({1, 4, 2, 1, 4, 4, 4}) ? 6 9 X maxSpan({3, 3, 3}) ? 3 5 X maxSpan({3, 9, 3}) ? 3 3 OK maxSpan({3, 9, 9}) ? 2 3 X maxSpan({3, 9}) ? 1 1 OK maxSpan({3, 3}) ? 2 3 X maxSpan({}) ? 0 1 X maxSpan({1}) ? 1 1 OK ::Code:: public int maxSpan(int[] nums) { int count=1;//keep an intial count of maxspan=1 int maxspan=0;//initialize maxspan=0 for(int i=0;i<nums.length;i++){ for(int j=i+1;j<nums.length;j++){ if(nums[i] == nums[j]){ //check to see if "i" index contents == "j" index contents count++; //increment count maxspan=count; //make maxspan as your final count int number = nums[i]; //number=actual number for maxspan } } } return maxspan+1; //return maxspan }

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  • Compare string with all values in array

    - by Hallik
    I am trying to fumble through python, and learn the best way to do things. I have a string where I am doing a compare with another string to see if there is a match: if paid[j].find(d)>=0: #BLAH BLAH If 'd' were an array, what is the most efficient way to see if the string contained in paid[j] has a match to any value in 'd'?

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  • Improved way to build nested array of unique values in javascript

    - by dualmon
    The setup: I have a nested html table structure that displays hierarchical data, and the individual rows can be hidden or shown by the user. Each row has a dom id that is comprised of the level number plus the primary key for the record type on that level. I have to have both, because each level is from a different database table, so the primary key alone is not unique in the dom. example: id="level-1-row-216" I am storing the levels and rows of the visible elements in a cookie, so that when the page reloads the same rows the user had open are can be shown automatically. I don't store the full map of dom ids, because I'm concerned about it getting too verbose, and I want to keep my cookie under 4Kb. So I convert the dom ids to a compact json object like this, with one property for each level, and a unique array of primary keys under each level: { 1:[231,432,7656], 2:[234,121], 3:[234,2], 4:[222,423], 5:[222] } With this structure stored in a cookie, I feed it to my show function and restore the user's previous disclosure state when the page loads. The area for improvement: I'm looking for better option for reducing my map of id selectors down to this compact format. Here is my function: function getVisibleIds(){ // example dom id: level-1-row-216-sub var ids = $("tr#[id^=level]:visible").map(function() { return this.id; }); var levels = {}; for(var i in ids ) { var id = ids[i]; if (typeof id == 'string'){ if (id.match(/^level/)){ // here we extract the number for level and row var level = id.replace(/.*(level-)(\d*)(.*)/, '$2'); var row = id.replace(/.*(row-)(\d*)(.*)/, '$2'); // *** Improvement here? *** // This works, but it seems klugy. In PHP it's one line (see below): if(levels.hasOwnProperty(level)){ if($.inArray(parseInt(row, 10) ,levels[level]) == -1){ levels[level].push(parseInt(row, 10)); } } else { levels[level] = [parseInt(row, 10)]; } } } } return levels; } If I were doing it in PHP, I'd build the compact array like this, but I can't figure it out in javascript: foreach($ids as $id) { if (/* the criteria */){ $level = /* extract it from $id */; $row = /* extract it from $id */; $levels[$level][$row]; } }

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  • Simple Array in java

    - by user1311590
    I need to create the following in my main method. Create an array of size 100 doubles. write a loop to sotr the number 150.0 - 249.0 in the 100 location. public class Lab6_2 { public static void main(String[] args) { double[] values; values = new double [100]; double i = 0; for(double i = 150.0; i<249.0;i++){ System.out.println(values[99]); } } }

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  • Calling a method with an array value in PHP

    - by Saif Bechan
    I have a class like this class someclass{ public function somemethod(){} } Now I have an array: $somearray['someclass'] = new someclass(); $somearray['somemethod'] = 'somemethod'; How can I fire them, I tried the following: $somearray['someclass']->$somearray['somemethod'](); usign this I get the following error: Fatal error: Method name must be a string in ...................... Anyone have an idea on how to do this?

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  • unrecognized selector sent to instance while trying to add an object to a mutable array

    - by madpoet
    I'm following the "Your Second iOS App" and I decided to play with the code to understand Objective C well... What I'm trying to do is simply adding an object to a mutable array in a class. Here are the classes: BirdSighting.h #import <Foundation/Foundation.h> @interface BirdSighting : NSObject @property (nonatomic, copy) NSString *name; @property (nonatomic, copy) NSString *location; @property (nonatomic, copy) NSDate *date; -(id) initWithName: (NSString *) name location:(NSString *) location date:(NSDate *) date; @end BirdSighting.m #import "BirdSighting.h" @implementation BirdSighting -(id) initWithName:(NSString *)name location:(NSString *)location date:(NSDate *)date { self = [super init]; if(self) { _name = name; _location = location; _date = date; return self; } return nil; } @end BirdSightingDataController.h #import <Foundation/Foundation.h> @class BirdSighting; @interface BirdSightingDataController : NSObject @property (nonatomic, copy) NSMutableArray *masterBirdSightingList; - (NSUInteger) countOfList; - (BirdSighting *) objectInListAtIndex: (NSUInteger) theIndex; - (void) addBirdSightingWithSighting: (BirdSighting *) sighting; @end BirdSightingDataController.m #import "BirdSightingDataController.h" @implementation BirdSightingDataController - (id) init { if(self = [super init]) { NSMutableArray *sightingList = [[NSMutableArray alloc] init]; self.masterBirdSightingList = sightingList; return self; } return nil; } -(NSUInteger) countOfList { return [self.masterBirdSightingList count]; } - (BirdSighting *) objectInListAtIndex: (NSUInteger) theIndex { return [self.masterBirdSightingList objectAtIndex:theIndex]; } - (void) addBirdSightingWithSighting: (BirdSighting *) sighting { [self.masterBirdSightingList addObject:sighting]; } @end And this is where I'm trying to add a BirdSighting instance to the mutable array: #import "BirdsMasterViewController.h" #import "BirdsDetailViewController.h" #import "BirdSightingDataController.h" #import "BirdSighting.h" @implementation BirdsMasterViewController - (void)awakeFromNib { [super awakeFromNib]; BirdSightingDataController *dataController = [[BirdSightingDataController alloc] init]; NSDate *date = [NSDate date]; BirdSighting *sighting = [[[BirdSighting alloc] init] initWithName:@"Ebabil" location:@"Ankara" date: date]; [dataController addBirdSightingWithSighting: sighting]; NSLog(@"dataController: %@", dataController.masterBirdSightingList); self.dataController = dataController; } .......... @end It throws NSInvalidArgumentException in BirdSightingDataController addBirdSightingWithSighting method... What am I doing wrong?

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  • C++ sort array of strings

    - by user69514
    I am trying to sort an array of strings, but it's not sorting anything.... what am I doing wrong? string namesS[MAX_NAMES]; int compare (const void * a, const void * b){ return ( *(char*)a - *(char*)b ); } void sortNames(){ qsort(namesS, MAX_NAMES, sizeof(string), compare); }

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  • Perl, search array

    - by Mike
    What is the smartest way of searching through an array of strings for a matching string in Perl? One caveat, I would like the search to be case-insensitive so "aAa" would be in ("aaa","bbb")

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