I am intending to pre-load all the images that I have stored inside application. Pre-loading of images involves:
Read images from bundle.
Extract object descriptors using cvExtractSurf from opencv framework.
Store IPLImage with corresponding object descriptors and keypoints.
I am having an issue in creating a dictionary containing CvSeq* keys and CvSeq* descs.
Please suggest how to store these values in NSMutableDictionary.
-(void) preloadImages:(NSMutableDictionary *)dictionary{
NSArray *d = [[NSBundle mainBundle] pathsForResourcesOfType:#"png" inDirectory:nil];
CvSURFParams params = cvSURFParams(500, 1);
CvMemStorage* storage = cvCreateMemStorage(0);
for( int i=0;i<[d count];i++){
NSString *searchForMe = #"myapp.app/1";
NSString *s = [[NSString alloc] initWithString:[d objectAtIndex:i]];
NSRange range = [s rangeOfString:searchForMe];
if( range.location != NSNotFound ){
NSMutableDictionary *surfDict = [[NSMutableDictionary alloc] init];
NSString *substring = [s substringFromIndex:range.location];
substring = [substring stringByReplacingOccurrencesOfString:#"myapp.app/" withString:#""];
UIImage *testImage = [UIImage imageNamed:substring];
IplImage *iplTestImage = [OpenCVUtilities CreateGRAYIplImageFromUIImage:testImage];
CvSeq *keys = 0 ;
CvSeq *descs = 0;
cvExtractSURF( iplTestImage, 0, &keys, &descs, storage, params );
[surfDict setObject:(id)testImage forKey:#"uiImage"];
NSLog(#"Image name : %#", substring);
[dictionary setObject:surfDict forKey:[NSString stringWithFormat:#"%d",i]];
[dictionary setObject:(NSObject *)keys forKey:#"keys"]; // error here
[dictionary setObject:(NSObject *)descs forKey:#"descs"]; // error here
[surfDict release];
}
}
}
Create a class that has an instance variable of type cvseq, add your cvseq to the object, and add that class to the dictionary.
Related
Im using foursquare API to get some locations around me, but when the name of that place wasn't in english, the name will be like follows:
name = "\U0645\U0633\U062c\U062f \U0627\U0644\U0633\U064a\U062f\U0629 \U0639\U0627\U0626\U0634\U0629 | Aisha Mosque";
i tried to convert the response to a UTF-8 but nothing changed.
Here is my code:
-(void)setUpLocations{
NSURL *url = [NSURL URLWithString: #"https://api.foursquare...."];
NSData *data = [NSData dataWithContentsOfURL:url];
NSError *error = nil;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
NSLog(#"Response: %#",[[[json objectForKey:#"response"]objectForKey:#"groups"]valueForKey:#"items"]);
}
And the log result is:
contact = {
};
id = 51712507498ec4e8c5ae9f48;
likes = {
count = 0;
groups = (
);
};
location = {
address = Abdoun;
cc = JO;
city = Amman;
country = Jordan;
distance = 3819;
lat = "31.95406043797281";
lng = "35.88095228186612";
};
name = "\U0645\U0633\U062c\U062f \U0627\U0644\U0633\U064a\U062f\U0629 \U0639\U0627\U0626\U0634\U0629 | Aisha Mosque";
restricted = 1;
stats = {
checkinsCount = 43;
tipCount = 2;
usersCount = 23;
};
verified = 0;
},
Any Suggestions ??
EDIT:
here is how i extract the data from the dictionary:
NSDictionary *dic = [[[[json objectForKey:#"response"]objectForKey:#"groups"]valueForKey:#"items"] copy];
namesArray = [[NSArray alloc]initWithArray:[self removeWhiteSpaces:[dic valueForKey:#"name"]]];
-(NSArray *)removeWhiteSpaces:(NSDictionary *)dic{
NSString *str = [NSString stringWithFormat:#"%#",dic];
NSString *str2 = [str stringByReplacingOccurrencesOfString:#"\n" withString:#""];
NSString *secondString = [str2 stringByReplacingOccurrencesOfString:#" " withString:#""];
NSString *thirdString = [secondString stringByReplacingOccurrencesOfString:#"(" withString:#""];
NSString *forthString = [thirdString stringByReplacingOccurrencesOfString:#")" withString:#""];
NSString *fifthString = [forthString stringByReplacingOccurrencesOfString:#"\"" withString:#""];
NSArray *items = [fifthString componentsSeparatedByString:#","];
return items;
}
And in the UITableView:
cell.textLabel.text = [NSString stringWithFormat:#"Name: %# ",[namesArray objectAtIndex:indexPath.row] ];
Update
After trying #Martin R answer i got the same results:
NSDictionary *dic = [[[[json objectForKey:#"response"]objectForKey:#"groups"]valueForKey:#"items"] copy];
NSString *value =[dic valueForKey:#"name"];
NSLog(#"%#", value);
UILabel *lbl = [[UILabel alloc]initWithFrame:self.view.frame];
lbl.numberOfLines = 0;
lbl.text = [NSString stringWithFormat:#"%#",value];;
[self.view addSubview:lbl];
and here is an image of the result
There is no problem.
NSLog() calls the description method of NSDictionary and NSArray, and that prints all non-ASCII characters as \Unnnn escape sequence.
If you extract the string values from the dictionary and print that you will see
that everything is correct.
Simple example:
NSDictionary *dict = #{ #"currency": #"€" };
NSLog(#"%#", dict);
// Output: { currency = "\U20ac"; }
NSString *value = dict[#"currency"];
NSLog(#"%#", value);
// Output: €
UPDATE: The problem seems to be in your removeWhiteSpaces: method, because
NSString *str = [NSString stringWithFormat:#"%#",dic];
already uses the description method to convert the dictionary to a string,
and the following stringByReplacingOccurrencesOfString calls are a (sorry!) very bad
method to fix that.
You should access the dictionary keys with objectForKey instead, or enumerate
the dictionary with for (NSString *key in dic) { ... } and build the desired
array.
UPDATE 2: From the JSON data (posted in chat discussion) it seem that you just need
NSArray *itemsArray = json[#"response"][#"groups"][0][#"items];
NSArray *namesArray = [itemsArray valueForKey:#"name"];
Note that "groups" is an array with one element.
Try to use this one..
[NSString stringWithUTF8String:]
I have an iPad that reads data from an SQL database. The following code works fine and retrieves 2 fields from each record and reads them into an NSArray.
I now need to read 5 of the fields and I can't help but think that there is a better way of doing it rather than running 5 separate queries through php (the getinfo.php file with the choice parameter set to pick the different fields).
Any pointers to a better method for doing this?
NSString *strURLClass = [NSString stringWithFormat:#"%#%#", #"http://wwwaddress/getinfo.php?choice=1&schoolname=",obsSchoolName];
NSArray *observationsArrayClass = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURLClass]];
observationListFromSQL = [[NSMutableArray alloc]init];
NSEnumerator *enumForObsClass = [observationsArrayClass objectEnumerator];
NSString *strURLDate = [NSString stringWithFormat:#"%#%#", #"http://wwwaddress/getinfo.php?choice=5&schoolname=",obsSchoolName];
NSArray *observationsArrayDate = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURLDate]];
observationListFromSQL = [[NSMutableArray alloc]init];
NSEnumerator *enumForObsDate = [observationsArrayDate objectEnumerator];
id className, dateOfObs;
while (className = [enumForObsClass nextObject])
{
dateOfObs = [enumForObsDate nextObject];
[observationListFromSQL addObject:[NSDictionary dictionaryWithObjectsAndKeys:className, #"obsClass", dateOfObs, #"obsDate",nil]];
}
Yes, you can do that with less code by "folding" the statements into a loop, and using a mutable dictionary:
// Add other items that you wish to retrieve to the two arrays below:
NSArray *keys = #[#"obsClass", #"obsDate"]; // Key in the dictionary
NSArray *choices = #[#1, #5]; // Choice in the URL string
NSMutableArray *res = [NSMutableArray array];
NSMutableArray *observationListFromSQL = [NSMutableArray array];
for (int i = 0 ; i != keys.count ; i++) {
NSNumber *choice = choices[i];
NSString *strURLClass = [NSString stringWithFormat:#"http://wwwaddress/getinfo.php?choice=%#&schoolname=%#", choice, obsSchoolName];
NSArray *observationsArray = [[NSMutableArray alloc] initWithContentsOfURL:[NSURL URLWithString:strURLClass]];
NSEnumerator *objEnum = [observationsArrayClass objectEnumerator];
NSString *key = keys[i];
NSMutableDictionary *dict;
if (res.count < i) {
dict = res[i];
} else {
dict = [NSMutableDictionary dictionary];
[res addObject:dict];
}
id item;
while (item = [objEnum nextObject]) {
[res setObject:item forKey:key];
}
}
I'm trying to replace a dictionary in a mutable array.
Steps 1 through 4 should be good, but I'm having some trouble in step 5 - 6. Can you show me what has to be done to make this function work:
- (void) updatePlist {
// 1: String with plist path:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory
stringByAppendingPathComponent:#"Object.plist"];
// 2: Create a mutable dictionary containing current object and write
// "Yes" to the "Favorite" string:
NSMutableDictionary *mutDict = [NSMutableDictionary
dictionaryWithDictionary:[detailsDataSource objectAtIndex:detailIndex]];
[mutDict setObject:#"Yes" forKey:#"Favorite"];
// 3: Make a string containing current object name:
NSString *nameString = [[detailsDataSource objectAtIndex:detailIndex]
valueForKey:#"Name"];
// 4: Make a mutable array containing all objects:
NSArray *allObjectsArray = [[NSArray alloc] initWithContentsOfFile:path];
NSMutableArray *tmpMutArr = [NSMutableArray arrayWithArray:allObjectsArray];
// 5: Search for the dictionary in tmpMutArr with "Name" value matching nameString:
int *index;
for(int i=0;i<[tmpMutArr count];i++)
{
if([[tmpMutArr objectAtIndex:i] isKindOfClass:[NSDictionary class]])
{
NSMutableDictionary *tempDict = [tmpMutArr objectAtIndex:i];
if([[tempDict valueForKey:#"Name"] isEqualToString:[NSString
stringWithFormat:#"%#", nameString]])nameString];)
{
index = i;
}
}
}
// 6: Replace the old dictionary with the new one and write array to plist:
[tmpMutArr replaceObjectAtIndex:index withObject:
[NSDictionary dictionaryWithDictionary:mutDict]];
allObjectsArray = nil;
allObjectsArray = [[NSArray alloc] initWithArray:tmpMutArr];
[allObjectsArray writeToFile:path atomically:YES];
}
EDIT:
Now the problem is:
for(int i=0;i<[tmpMutArr count];i++)
{
if([[tmpMutArr objectAtIndex:i] isKindOfClass:[NSDictionary class]])
{
NSMutableDictionary *tempDict = [tmpMutArr objectAtIndex:i];
if([[tempDict valueForKey:#"Name"] isEqualToString:
[NSString stringWithFormat:#"%#", nameString]])nameString];)
{
index = i; // Here 1
}
}
}
// ---------------------------- v And here 2
[tmpMutArr replaceObjectAtIndex:index withObject:
[NSDictionary dictionaryWithDictionary:mutDict]];
1: Incompatible integer to pointer conversion assigning to 'int' from 'int'; take the adress with &
2: Incompatible pointer to integer conversion sending 'int *' to parameter of type NSUInteger' (aka 'unsigned int')
Replace the line:
if([tempDict valueForKey:#"Name" == [NSString stringWithFormat:#"", nameString];)
with this line:
if([[tempDict valueForKey:#"Name"] isEqualToString: [NSString stringWithFormat:#"%#", nameString]])
since you are using string comparison here.
As pointed out in the comments by Martin R, you are trying to save an int value into a int pointer variable.
int index; //instead of 'int *index;'
That change should do the trick.
It could have worked if you had written int *index; and then index = &i;, since you are saving a pointer to an integer that way. But it doesn't seem to be what you are trying to do.
The second error is due you are providing an int pointer instead of an integer to this method:
[tmpMutArr replaceObjectAtIndex:index withObject:
[NSDictionary dictionaryWithDictionary:mutDict]];
But declaring index as an integer solves both errors already.
I am new to Objective-C. I am using NSArrayController to fill NSTableView. Initially, I am getting all rows selected in the table view. I am unable to find the reason behind it.
for(int i=0;i<nCount;i++)
{
NSString *fileName_File = [[[filenames objectAtIndex:i] lastPathComponent] stringByDeletingPathExtension];
NSString *pathExtension = [[filenames objectAtIndex:i] pathExtension];
NSString *yourPath = [filenames objectAtIndex:i];
NSFileManager *fmgr = [[NSFileManager alloc] init];
NSDictionary *attrs = [fmgr attributesOfItemAtPath: yourPath error: nil];
[attrs retain];
UInt32 result = [attrs fileSize];
/*NSString * zStr1 = [[NSString alloc]initWithFormat:#"%d",i+1];
NSString * zStr2 = [[NSString alloc]initWithFormat:#"%#",fileName_File];
NSString * zStr3 = [[NSString alloc]initWithFormat:#"%#",pathExtension];
NSString * zStr4 = [[NSString alloc]initWithFormat:#"%d",result];
NSString * zStr5 = [[NSString alloc]initWithFormat:#"%#",[filenames objectAtIndex:i]];*/
CMyMediaData * MyMediaObj = [[CMyMediaData alloc]initWithString1:[[NSString alloc]initWithFormat:#"%#",#""]
andString2:[[NSString alloc]initWithFormat:#"%#",fileName_File]
andString3:[[[NSString alloc]initWithFormat:#"%#",pathExtension]uppercaseString]
andString4:[[NSString alloc]initWithFormat:#"%d",result]
andString5:[[NSString alloc]initWithFormat:#"%#",[filenames objectAtIndex:i]]
];
[attrs release];
[mMedia.mcMediaController.mcTableViewMyMedia addObject:MyMediaObj];
//[mMedia.nsMutaryOfDataObject addObject:MyMediaObj];
} this is the code to add data to nsarraycontroller object.mcMediaController is object of NSArrayController
NSArrayController has a property selectsInsertedObjects. If that is YES, inserted objects are marked selected, including the ones added by addObject:.
You can set that property to NO, or you can use the following to unset the selection after adding the items:
mMedia.mcMediaController.mcTableViewMyMedia.selectedObjects = #[];
I have an Array {-1,0,1,2,3,4...}
I am trying to find whether an element exist in these number or not, code is not working
NSInteger ind = [favArray indexOfObject:[NSNumber numberWithInt:3]];
in ind i am always getting 2147483647
I am filling my array like this
//Loading favArray from favs.plist
NSString* favPlistPath = [[NSBundle mainBundle] pathForResource:#"favs" ofType:#"plist"];
NSMutableDictionary* favPlistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:favPlistPath];
NSString *favString = [favPlistDict objectForKey:#"list"];
NSArray *favList = [favString componentsSeparatedByString:#","];
//int n = [[favList objectAtIndex:0] intValue];
favArray = [[NSMutableArray alloc] initWithCapacity:100];
if([favList count]>1)
{
for(int i=1; i<[favList count]; i++)
{
NSNumber *f = [favList objectAtIndex:i];
[favArray insertObject:f atIndex:(i-1)];
}
}
That's the value of NSNotFound, which means that favArray contains no object that isEqual: to [NSNumber numberWithInt:3]. Check your array.
After second edit:
Your favList array is filled with NSString objects. You should convert the string objects to NSNumber objects before inserting them in favArray:
NSNumber *f = [NSNumber numberWithInt:[[favList objectAtIndex:i] intValue]];