JSON text and variable count - objective-c

I am reading like this...
NSString *fileContent = [[NSString alloc] initWithContentsOfFile:path];
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSDictionary *data = (NSDictionary *) [parser objectWithString:fileContent error:nil];
// getting the data from inside of "menu"
NSString *message = (NSString *) [data objectForKey:#"message"];
NSString *name = (NSString *) [data objectForKey:#"name"];
NSArray *messagearray = [data objectForKey:#"message"];
NSArray *namearray = [data objectForKey:#"name"];
NSDictionary* Dictionary = [NSDictionary dictionaryWithObjects:message forKeys:name];
for (NSString* Key in [Dictionary allKeys]){
NSLog(#"%# %#",Key,[Dictionary objectForKey:Key]);
}
...this JSON file...
{"message":["Untitled1a","Untitled2a","Untitled3a"],"name": ["Untitled1b","Untitled2b","Untitled3b"]}
...this is the result...
Untitled3b Untitled3a
2012-05-12 11:31:17.983 Quick Homework[721:f803] Untitled1b Untitled1a
2012-05-12 11:31:17.983 Quick Homework[721:f803] Untitled2b Untitled2a
...but for each pair (Untitled 1b 2b) I would like to alloc two UITextFields, witch display the correspondent text...
I tried using this method:
for (NSString *string in messagearray){
}do{
NSLog(#"happt = %i", b);
b++;
}
while(b == b);
//While loop
while (b == b ) {
NSLog(#"x = %i", b);
b++;
}
}
I would like to count the objects in the array in order to repeat an alloc code for UITextField that number of times, and display the text accordingly, but I am not able. Please help!!

Why can't you use -count?
b = [messagearray count]
To directly answer your question:
b = 0;
for (id item in messagearray)
b++;

Related

Unable to convert UTF-8 text from NSDictionary in Objective-C

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:]

Reading from SQL database into NSArray

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];
}
}

FMDB Query with dictionary

I need to run a query that looks would look like
INSERT INTO Appointments (field1, field2, field3, ..., field30) VALUES (value1, value2, value3, ..., value30)
I have my Appointments being stored inside a Dictionary and would like to loop through that dictionary to make the keys equal the fields and the values equal the values.
I'm trying to use the executeUpdate:... withParameterDictionary:... but can't figure out how to make that work with multiple fields if I don't know the field names. The field names are being sent via JSON and instead of manually typing out 30 fields I would just like to loop through the dictionary and get them that way.
I have even tried
NSMutableArray *keys = nil;
NSMutableArray *values = nil;
for (NSDictionary *dict in [json objectForKey:#"data"]) {
keys = [NSMutableArray array];
values = [NSMutableArray array];
for (id key in dict) {
[keys addObject:key];
[values addObject:[NSString stringWithFormat:#":%#", key]];
}
NSString *keyString = [keys componentsJoinedByString:#","];
NSString *valueString = [values componentsJoinedByString:#","];
[[dataObj db] executeUpdate:#"DELETE FROM Appointments"];
NSLog(#"INSERT INTO Appointments (%#) VALUES (%#)", keyString, valueString);
[[dataObj db] executeUpdate:#"INSERT INTO Appointments (?) VALUES (?)", keyString, valueString];
}
The code above prints the NSLog how the query should looks but nothing is being inserted into the database. I know this because I am opening the simulator database file after the queries run and it is still blank.
How can I get the above code to work or how can I get the executeQuery:... withParameterDictionary:... to work with multiple names.
I ran a couple of quick tests, and this works for me:
NSDictionary* dict = [NSDictionary dictionaryWithObjectsAndKeys:#"AAAA44", #"a", #"BBBB44", #"b", #"CCCC44", #"c", nil];
NSMutableArray* cols = [[NSMutableArray alloc] init];
NSMutableArray* vals = [[NSMutableArray alloc] init];
for (id key in dict) {
[cols addObject:key];
[vals addObject:[dict objectForKey:key]];
}
NSMutableArray* newCols = [[NSMutableArray alloc] init];
NSMutableArray* newVals = [[NSMutableArray alloc] init];
for (int i = 0; i<[cols count]; i++) {
[newCols addObject:[NSString stringWithFormat:#"'%#'", [cols objectAtIndex:i]]];
[newVals addObject:[NSString stringWithFormat:#"'%#'", [vals objectAtIndex:i]]];
}
NSString* sql = [NSString stringWithFormat:#"insert into test (%#) values (%#)", [newCols componentsJoinedByString:#", "], [newVals componentsJoinedByString:#", "]];
NSLog(#"%#", sql);
BOOL updateSuccess = [db executeUpdate:sql];
The trick is to add ' to the data in the arrays.
NSDictionary *argsDict
= [NSDictionary dictionaryWithObjectsAndKeys:#"My Name",
#"name", nil];
[db executeUpdate:#"INSERT INTO myTable (name) VALUES (:name)"
withParameterDictionary:argsDict];
Here is some sample code I just wrote to support optional values at insert time. Just briefly tested but I think it works.
NSMutableDictionary* fieldsandvalues = [NSMutableDictionary dictionary];
fieldsandvalues[#"word"] = userphrase.word;
fieldsandvalues[#"translation"] = userphrase.translation;
if (userphrase.samplesentence.length > 0) {
fieldsandvalues[#"samplesentence"] = userphrase.samplesentence;
}
if (userphrase.notes.length > 0) {
fieldsandvalues[#"notes"] = userphrase.notes;
}
NSMutableArray* keyswithcolon = [NSMutableArray array];
for (NSString* key in fieldsandvalues.allKeys) {
[keyswithcolon addObject:[NSString stringWithFormat:#":%#", key]];
}
NSString* sql = [NSString stringWithFormat:#"INSERT INTO userphrase (%#) VALUES (%#)", [fieldsandvalues.allKeys componentsJoinedByString:#","], [keyswithcolon componentsJoinedByString:#","]];
// DLog(#"sql: %#", sql);
if (![self.db executeUpdate:sql withParameterDictionary:fieldsandvalues]) {
NSAssert(NO, #"Failed inserting userphrase into database! Last error: %# - %#", self.db.lastError, self.db.lastErrorMessage);
return nil;
}

How do I retrieve all the rows from an SQLite table?

hello guys i am doing some database operations in iphone .. please can anyone explain me how to retrieve all rows from the table..here in this example it retreives only the latest entered data..
while(sqlite3_step(statement) == SQLITE_ROW)
{
char *field1 = (char *) sqlite3_column_text(statement,0);
NSString *field1Str = [[NSString alloc] initWithUTF8String: field1];
char *field2 = (char *) sqlite3_column_text(statement,1);
NSString *field2Str = [[NSString alloc] initWithUTF8String: field2];
NSString *str = [[NSString alloc] initWithFormat:#"%#::%#",field1Str, field2Str];
textv.text=str;
[field1Str release];
[field2Str release];
}
You were doing all right so far. Just keep adding the final formatted string (str) in an NSMutableArray and finally return it from the function.
// Take an array to store all string.
NSMutableArray *allRows = [[[NSMutableArray alloc] init] autorelease];
while(sqlite3_step(statement) == SQLITE_ROW)
{
char *field1 = (char *) sqlite3_column_text(statement,0);
NSString *field1Str = [[NSString alloc] initWithUTF8String: field1];
char *field2 = (char *) sqlite3_column_text(statement,1);
NSString *field2Str = [[NSString alloc] initWithUTF8String: field2];
NSString *str = [NSString stringWithFormat:#"%#::%#",field1Str, field2Str];
// textv.text=str; // I don't know why your are mixing your view controller stuff's in database function.
// Add the string in the array.
allRows addObject:str];
[field1Str release];
[field2Str release];
}
// Finally you can return your allRows
return allRows;

How to convert nsstring to nsdictionary?

I have gone through following question.
Convert NSString to NSDictionary
It is something different then my question.
My question is as follows.
NSString *x=#"<Category_Id>5</Category_Id><Category_Name>Motos</Category_Name><Category_Picture>http://192.168.32.20/idealer/admin/Picture/icon_bike2009819541578.png</Category_Picture>";
Now I want to convert this into a dictionary, something like this,
dictionary key = Category_Id | value = 5
dictionary key = Category_Name | value = ???
dictionary key = Category_Picture | value = ???
I don't know how to perform this.
Not the fastest implementation, but this would do the trick (and doesn’t require any third party libraries):
#interface NSDictionary (DictionaryFromXML)
+ (NSDictionary *)dictionaryFromXML:(NSString *)xml;
#end
#implementation NSDictionary (DictionaryFromXML)
+ (NSDictionary *)dictionaryFromXML:(NSString *)xml
{
// We need to wrap the input in a root element
NSString *x = [NSString stringWithFormat:#"<x>%#</x>", xml];
NSXMLDocument *doc = [[[NSXMLDocument alloc] initWithXMLString:x
options:0
error:NULL]
autorelease];
if (!doc)
return nil;
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
for (NSXMLElement *el in [[doc rootElement] children])
[dict setObject:[el stringValue] forKey:[el name]];
return dict;
}
#end
If it's XML then you can use an NSXMLParser. If it's not then you can write your own parser.
You could do it with a regular expression... Something like <([^>]+)>([^<]+)</\1> would grab the key into capture 1 and the value into capture 2. Iterate over the matches and build the dictionary.
This uses RegexKitLite:
NSString * x = #"<Category_Id>5</Category_Id><Category_Name>Motos</Category_Name><Category_Picture>http://192.168.32.20/idealer/admin/Picture/icon_bike2009819541578.png</Category_Picture>";
NSString * regex = #"<([^>]+)>([^<]+)</\\1>";
NSArray * cap = [x arrayOfCaptureComponentsMatchedByRegex:regex];
NSMutableDictionary * d = [NSMutableDictionary dictionary];
for (NSArray * captures in cap) {
if ([captures count] < 3) { continue; }
NSString * key = [captures objectAtIndex:1];
NSString * value = [captures objectAtIndex:2];
[d setObject:value forKey:key];
}
NSLog(#"%#", d);