I know to read the contents of file in Objective-C, but how to take it as the input to hashtable.
Consider the contents of text file as test.txt
LENOVA
HCL
WIPRO
DELL
Now i need to read this into my Hashtable as Key value pairs
KEY VAlue
1 LENOVA
2 HCL
3 WIPRO
4 DELL
You want to parse your file into an array of strings and assign each element in this array with a key. This may help you get in the right direction.
NSString *wholeFile = [NSString stringWithContentsOfFile:#"filename.txt"];
NSArray *lines = [wholeFile componentsSeparatedByString:#"\n"];
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithCapacity:[lines count]];
int counter = 1;
for (NSString *line in lines)
{
if ([line length])
{
[dict setObject:line forKey:[NSString stringWithFormat:"%d", counter]];
// If you want `NSNumber` as keys, use this line instead:
// [dict setObject:line forKey:[NSNumber numberWithInt:counter]];
counter++;
}
}
Keep in mind this isn't the most efficient method of parsing your file. It also uses the deprecated method stringWithContentsOfFile:.
To get the line back, use:
NSString *myLine = [dict objectForKey:#"1"];
// If you used `NSNumber` class for keys, use:
// NSString *myLine = [dict objectForKey:[NSNumber numberWithInt:1]];
Related
I have an NSString that returns a list of values like this:
test_1=value_1
test/2=value_2
test3=value_3 value_4
test_4=value_5/value_6
...
More realistic result values:
inameX=vlan2
hname=server
lanipaddr=192.168.1.1
lannetmask=255.255.255.0
islan=0
islwan=0
dhcplease=604800
dhcplease_1=302400
ct_tcp_timeout=0 1200 40 30 60 60 5 30 15 0
ct_timeout=10 10
ct_udp_timeout=25 60
ctf_disable=1
ddnsx0=
cifs2=0<\\192.168.1.5
and so on...
If I do:
for (id key in dict) {
NSLog(#"key: %#, value: %#", [dict objectForKey:key], key);
}
it outputs:
key: inameX, value: vlan2
key: hname value: server
key: lanipaddr value: 192.168.1.1
key: lannetmask value: 255.255.255.0
This list is stored in one NSString *result. Not sure if I should put it in an array for this but I need to be able to call a function or command that will return a specific value_X based on the argument to match the variable. For example, get value of test_1 variable then it would return value_1. Or get test_4 then it would return value_5/value_6
Any idea how I can do that?
I appreciate your help. Thanks!
You probably want the method in NSString called componentsSeparatedByCharactersInSet: to split up that one string into an array. Since your values are separated by '=' and new line characters ('\n'), you want the set to include those two characters:
NSArray *strings = [NSString componentsSeparatedByCharactersInSet:
[NSCharacterSet characterSetWithCharactersInString:#"=\n"]];
And then you can make this into a dictionary with NSDictoinary's dictionaryWithObjects: AndKeys: But first, you need to split that array into two arrays; one with objects, one with keys:
NSMutableArray *keys = [NSMutableArray new];
NSMutableArray *values = [NSMutableArray new];
for (int i = 0; i < strings.count; i++) {
if (i % 2 == 0) { // if i is even
[keys addObject:strings[i]];
}
else {
[values addObject:strings[i]];
}
}
Then you put them into an NSDictonary
NSDictionary *dict = [NSDictionary dictionaryWithObjects:values forKeys:keys];
NSLog(#"%#", dict[#"test_1"]) // This should print out 'value_1'
Hope that helps!
Use an NSDicationary. NSDictionaries are key value stores. In other words, there are a list of keys. Each key is unique. Each key has an associated value. The value can be any data type and the key has to conform to the NSCopying protocol (typically an NSString). If you try to access the value for a key that doesn't exist in your NSDictionary, the return value will be nil.
//create the dictionary and populate it
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
[dict setObject:#"value_1" forKey:#"key_1"];
[dict setObject:#"value_2" forKey:#"key_2"];
[dict setObject:#"value_3" forKey:#"key_3"];
[dict setObject:#"value_4" forKey:#"key_4"];
NSString *stringInput = [self getStringInput];//however you find out your input
//find your string value based on the key passed in
NSString *strValue = [dict objectForKey:stringInput];
You can use a NSScanner to make this work.
Scan for the string for which you want the value, and then scan the string until you encounter \n and then use it for your requirement.
NSScanner *scan =[NSScanner scannerWithString:theString];
[scan scanString:keyString inToString:nil];
[scan setScanLocation:[scan scanLocation]+1];
[scan scanString:#"\n" inToString:requiredString];
So requiredString is the string which you want.
I got a dictionary with 10 arrays and each array got 20 elements. How can i access the 18th element of an each array? pointers please. Thanks. Attaching my log file
for (NSString *key in [dictionary allKeys])
{
NSArray *menuList = [dictionary objectForKey:key];
NSString *imageName = [menuList objectAtIndex:17];
NSLog(#"Image Name:%#", imageName);
}
It seems what you actually wanted was
NSString *imageName = [dictionary objectForKey:#"episodeImagePath"];
Use the following code
//iterate all values
for (NSArray *arr in yourDictionary.allValues) {
//To loop the array
for (NSString *str in arr) {
NSLog(#"Element %#", str);
}
}
i think its better to take one object class, so that we can get all 18th elements in one array
I have a singleton class where I set up a NSMutableDictionary called completedLevels.
This is how I set it up (in the init method of my singleton):
NSString *mainPath = [[NSBundle mainBundle] bundlePath];
NSString *levelConfigPlistLocation = [mainPath stringByAppendingPathComponent:#"levelconfig.plist"];
NSDictionary *levelConfig = [[NSDictionary alloc] initWithContentsOfFile:levelConfigPlistLocation];
completedLevels = [[NSMutableDictionary alloc]init];
NSMutableDictionary *levelSets = [[NSMutableDictionary alloc]init];
NSMutableDictionary *levels = [[NSMutableDictionary alloc]init];
NSMutableDictionary *stats = [[NSMutableDictionary alloc]init];
[stats setObject:[NSNumber numberWithBool:NO] forKey:#"levelDone"];
[stats setObject:[NSNumber numberWithInt:0] forKey:#"stars"];
[stats setObject:[NSNumber numberWithInt:0] forKey:#"time"];
[stats setObject:[NSNumber numberWithInt:0] forKey:#"bestTime"];
for (int i = 1; i<=18; i++) {
[levels setObject:stats forKey:[NSString stringWithFormat:#"level%d", i]];
}
for(int i= 1; i<=15;i++){
NSString *lvlSet = [NSString stringWithFormat:#"levelSet%d", i];
[levelSets setObject:levels forKey:lvlSet];
}
NSArray *categoriesArray = [levelConfig objectForKey:#"categoriesArray"];
for (int i=0; i<[categoriesArray count]; i++) {
NSString *category = [[levelConfig objectForKey:#"categoriesArray"]objectAtIndex:i];
[completedLevels setObject:levelSets forKey:category];
}
I want to explain my doings:
My intention was to create a dictionary in this form:
category = {
levelSet1 ={
level1 ={
bestTime = 0;
levelDone = 0;
stars = 0;
time = 0;
};
level2={
bestTime = 0;
levelDone = 0;
stars = 0;
time = 0;
};
.
.
.
}
levelSet2 ={
level1 ={
bestTime = 0;
levelDone = 0;
stars = 0;
time = 0;
};
level2={
bestTime = 0;
levelDone = 0;
stars = 0;
time = 0;
};
.
.
.
}
.
.
.
}
%d in the case of levelSet are integers from 1 to 15.
%d in the case of level are integers from 1 to 18.
I have several categories, and thus multiple sets of the example above.
This works well and upon calling NSLog, the dictionary appears in my console as it should.
The problem, however, arises when I want to change some entries in my dictionary as shown in the example below:
NSString *category = [[GameStateSingleton sharedMySingleton]getCurrentCategory];
NSString *levelSet = [NSString stringWithFormat:#"levelSet%d",[[GameStateSingleton sharedMySingleton]getSharedLevelSet]];
NSNumber *currentLevel = [NSNumber numberWithInt:[[GameStateSingleton sharedMySingleton]getSharedLevel]];
NSString *levelString = [NSString stringWithFormat:#"level%d", [currentLevel intValue]];
NSMutableDictionary *categories = [[NSMutableDictionary alloc]initWithDictionary:
[[GameStateSingleton sharedMySingleton]getCompletedLevels]];
[[[[categories objectForKey:category]objectForKey:levelSet]objectForKey:levelString]setObject:[NSNumber numberWithBool:YES] forKey:#"levelDone"];
[[GameStateSingleton sharedMySingleton]setCompletedLevels:categories];
NSLog(#"%#",[[GameStateSingleton sharedMySingleton]getCompletedLevels]);
To explain that:
When the player is done with a level, I want the levelDone entry to change its value. But when I log it afterwards, suddenly all levelDone entries of all categories change to the BOOLEAN value of 1. Why is that ?
------------------- update -----------------------
completedLevels = [[NSMutableDictionary alloc]init];
NSMutableDictionary *levelSets = [[NSMutableDictionary alloc]init];
NSMutableDictionary *levels = [[NSMutableDictionary alloc]init];
NSMutableDictionary *stats = [[NSMutableDictionary alloc]init];
[stats setObject:[NSNumber numberWithBool:NO] forKey:#"levelDone"];
[stats setObject:[NSNumber numberWithInt:0] forKey:#"stars"];
[stats setObject:[NSNumber numberWithInt:0] forKey:#"time"];
[stats setObject:[NSNumber numberWithInt:0] forKey:#"bestTime"];
for (int i = 1; i<=18; i++) {
NSMutableDictionary *statsCopy = [stats mutableCopy];
[levels setObject:statsCopy forKey:[NSString stringWithFormat:#"level%d", i]];
[statsCopy release];
}
for(int i= 1; i<=15;i++){
NSString *lvlSet = [NSString stringWithFormat:#"levelSet%d", i];
NSMutableDictionary *levelsCopy = [levels mutableCopy];
[levelSets setObject:levelsCopy forKey:lvlSet];
[levelsCopy release];
}
NSArray *categoriesArray = [levelConfig objectForKey:#"categoriesArray"];
for (int i=0; i<[categoriesArray count]; i++) {
NSString *category = [[levelConfig objectForKey:#"categoriesArray"]objectAtIndex:i];
NSMutableDictionary *levelSetsCopy = [levelSets mutableCopy];
[completedLevels setObject:levelSetsCopy forKey:category];
[levelSetsCopy release];
}
The part where I retrieve and set it stayed the same...
_________________ SOLUTION ____________________
NSMutableDictionary *mutableCopy = (NSMutableDictionary *)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFDictionaryRef)originalDictionary, kCFPropertyListMutableContainers);
I made deep-copies with this method.
Basically, the problem is that you are setting the level dictionary for each level to the same stats object:
for (int i = 1; i<=18; i++) {
[levels setObject:stats forKey:[NSString stringWithFormat:#"level%d", i]];
}
Instead, you need to set them each to a different mutable copy of the object:
for (int i = 1; i<=18; i++) {
NSMutableDictionary *statsCopy = [stats mutableCopy];
[levels setObject:statsCopy forKey:[NSString stringWithFormat:#"level%d", i]];
[statsCopy release];
}
That should solve the first part for you. However, you also have the same problem with the levelSets. Basically, whenever you add a mutable dictionary, you need to determine whether you are trying to point at the same mutable object (you want to keep them synchronized), or whether you want copies of that mutable object (thus, they act independently). And when you look at building this kind of tree structure, that means you need to look at this at every level.
So, looking at the rest of your code, you'll also need to fix your level sets and categories in the same way, by making a mutable copy inside of each loop and then adding that mutable copy instead of adding the original object. And, since you want to mutate the contents of the contents of the dictionaries, every time you make a mutable copy that contains another mutable dictionary, you need to make that copy at each depth.
You are going to have to choose between building these things depth-wise or doing a deep copy. There's another question:
deep mutable copy of a NSMutableDictionary
That covers deep copies of mutable dictionaries pretty well. Alternatively, you can invert the building of the structure so that instead of making copies, you build each dictionary except for stats which you can easily copy.
The deep copy creates copies of each of the mutable entries all the way down to the farthest leaf nodes. If you think about the NSMutableDictionaries as a tree with the base of the tree at the top ( completedLevels in your case) and the leaves as the elements of the stats NSMutableDictionaries that you copy, you want to individually manipulate every element of the tree, whether it is the leaf node or any intermediate.
An illustration could be made as follows, with this representing the contents of MyDictionary:
Top-A:
Second-A-1
Second-A-2
Top-B:
Second-B-1
Second-B-2
To recap, you have the MyDictionary at the top, which has 2 keys (Top-A,Top-B), each of which is associated with a separate NSMutableDictionary object. Each of those NSMutableDictionaries has 2 keys, each associated with a separate object.
When you make a -mutableCopy of MyDictionary, the result is a new NSMutableDictionary with 2 keys (Top-A,Top-B), each associated with an NSMutableDictionary. However, these NSMutableDictionary objects are actually the same objects as the ones in MyDictionary. This is a shallow copy, meaning that there is a new top-level object (the mutable copy of MyDictionary), but that objects associated with each of the keys in the new dictionary are the same objects as were associated with the keys in MyDictionary. As such, if you change Top-A in the copy be associated with a different NSMutableDictionary, then the Top-A in MyDictionary and the copy will no longer be the same. But, if you change the value associated with Second-A-1, it will change both in MyDictionary and the copy of MyDictionary because Top-A points at a single object.
When you make a deep copy, the utility copies every element of every dictionary individually, which means that the copy of MyDictionary will have a separate Top-A, Second-A-1, Second-A-2,Top-B, etc. from the ones that exist in MyDictionary, and therefore, you can change the values of any of the dictionaries (no matter how deep) without fear of changing other objects.
I save pieces of data from my Cocoa application into a text file. The text file contains information as shown:
foo1 -> foo2
blah -> lwjef
hi -> bye
hello -> goodbye
Now the first part of each row is given by the user, but I need to get the part of each row after the ->. For example, if the user enters foo1, I want to output foo2 after parsing the text file. Does anyone know how to do this?
Parse once:
NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
NSArray *lines = [string componentsSeparatedByCharactersInSet: [NSCharacterSet newlineCharacterSet]];
for (NSString *line in lines) {
NSArray *values = [line componentsSeparatedByString:#" -> "];
if ([values count] != 2) {
continue;
}
[dictionary setObject:[values objectAtIndex:1] forKey:[values objectAtIndex:0]];
}
Then query for keys:
NSString *input = #"foo1";
NSString *answer = [dictionary objectForKey:input]; //#"foo2"
However, if the data originally came from your own application in the first place you should probably do this, instead of a custom (and insecure) string format:
//For saving:
[dictionary writeToFile:filePath atomically:YES];
//For loading:
NSDictionary *dictionary = [NSDictionary dictionaryWithContentsOfFile:filePath];
I was wondering if someone can show me how to sort an NSDictionary; I want to read it starting from the last entry, since the key is Date + Time and I want to be able to append it to an NSMutableString. I was able to read it using an enumerator but I don't get the results I want.
Thanks
For your requirements the easiest way is to create a new array from the keys, sort that, then use the array to reference items from the original dictionary.
(Note myComparison is your own method that will compare two keys).
NSMutableArray* tempArray = [NSMutableArray arrayWithArray:[myDict allKeys]];
[tempArray sortedArrayUsingSelector:#selector(myComparison:)];
for (Foo* f in tempArray)
{
Value* val = [myDict objectForKey:f];
}
I've aggregated some of the other suggestions on StackOverflow on sorting an NSDictionary into something very compact that will sort alphabetically. I have a Plist file in 'path' that I load in to memory and want to dump.
NSDictionary *glossary = [NSDictionary dictionaryWithContentsOfFile: path];
NSArray *array1 = [[glossary allKeys] sortedArrayUsingDescriptors:#[ [NSSortDescriptor sortDescriptorWithKey:#"" ascending:YES selector:#selector(localizedStandardCompare:)] ]];
for ( int i=0; i<array1.count; i++)
{
NSString* key = [array1 objectAtIndex:i];
NSString* value = [glossary objectForKey:key];
NSLog(#"Key=%#, Value=%#", key, value );
}