I have a dictionary of NSData values where I am passing the different values into their variables that I later use to display in tableviewcells etc.
However I have some international characters that are not displaying correctly and I would like to encode the data I am passing to a NSString but I am not sure how to do it because of the circumstances.
This is what I am currently doing.
manString = [dict valueForKey:#"MAN"];
The dict contains all of the data that i am using. any help would be appreciated
You can do this:
NSString* string = [[NSString alloc] initWithData:[dict valueForKey:#"MAN"]
encoding:NSStringEncoding];
Where encoding should be a value from NSStringEncoding enum, you can find it in NSString.h, just choose encoding you need, usually it is NSUTF8StringEncoding, but I guess not in your case.
Related
I have a strange problem encoding my String
For example:
NSString *str = #"\u0e09\u0e31\u0e19\u0e23\u0e31\u0e01\u0e04\u0e38\u0e13";
NSString *utf = [str stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog("utf: %#", utf);
This worked perfectly in log
utf: ฉันรักคุณ
But, when I try using my string that I parsed from JSON with the same string:
//str is string parse from JSON
NSString *str = [spaces stringByReplacingOccurrencesOfString:#"U" withString:#"u"];
NSLog("str: %#, str);
NSString *utf = [str stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog("utf: %#", utf);
This didn't work in log
str: \u0e09\u0e31\u0e19\u0e23\u0e31\u0e01\u0e04\u0e38\u0e13
utf: \u0e09\u0e31\u0e19\u0e23\u0e31\u0e01\u0e04\u0e38\u0e13
I have been finding the answer for hours but still have no clue
Any would be very much appreciated! Thanks!
The string returned by JSON is actually different - it contains escaped backslashes (for each "\" you see when printing out the JSON string, what it actually contains is #"\").
In contrast, your manually created string already consists of "ฉันรักคุณ" from the beginning. You do not insert backslash characters - instead, #"\u0e09" (et. al.) is a single code point.
You could replace this line
NSString *utf = [str stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
with this line
NSString *utf = str;
and your example output would not change. The stringByReplacingPercentEscapesUsingEncoding: refers to a different kind of escaping. See here about percent encoding.
What you need to actually do, is parse the string for string representations of unicode code points. Here is a link to one potential solution: Using Objective C/Cocoa to unescape unicode characters. However, I would advise you to check out the JSON library you are using (if you are using one) - it's likely that they provide some way to handle this for you transparently. E.g. JSONkit does.
I have a unicode string as
{\rtf1\ansi\ansicpg1252\cocoartf1265
{\fonttbl\f0\fswiss\fcharset0 Helvetica;\f1\fnil\fcharset0 LucidaGrande;}
{\colortbl;\red255\green255\blue255;}
{\*\listtable{\list\listtemplateid1\listhybrid{\listlevel\levelnfc23\levelnfcn23\leveljc0\leveljcn0\levelfollow0\levelstartat1\levelspace360\levelindent0{\*\levelmarker \{check\}}{\leveltext\leveltemplateid1\'01\uc0\u10003 ;}{\levelnumbers;}\fi-360\li720\lin720 }{\listname ;}\listid1}}
{\*\listoverridetable{\listoverride\listid1\listoverridecount0\ls1}}
\paperw11900\paperh16840\margl1440\margr1440\vieww22880\viewh16200\viewkind0
\pard\li720\fi-720\pardirnatural
\ls1\ilvl0
\f0\fs24 \cf0 {\listtext
\f1 \uc0\u10003
\f0 }One\
{\listtext
\f1 \uc0\u10003
\f0 }Two\
}
Here i have unicode data \u10003 which is equivalent to "✓" characters. I have used
[NSString stringWithCharacters:"\u10003" length:NSUTF16StringEncoding] which is throwing compilation error. Please let me know how to convert these unicode characters to "✓".
Regards,
Boom
I have same for problem and the following code solve my issue
For Encode
NSData *dataenc = [yourtext dataUsingEncoding:NSNonLossyASCIIStringEncoding];
NSString *encodevalue = [[NSString alloc]initWithData:dataenc encoding:NSUTF8StringEncoding];
For decode
NSData *data = [yourtext dataUsingEncoding:NSUTF8StringEncoding];
NSString *decodevalue = [[NSString alloc] initWithData:data encoding:NSNonLossyASCIIStringEncoding];
Thanks
I have used below code to convert a Uniode string to NSString. This should work fine.
NSData *unicodedStringData =
[unicodedString dataUsingEncoding:NSUTF8StringEncoding];
NSString *emojiStringValue =
[[NSString alloc] initWithData:unicodedStringData encoding:NSNonLossyASCIIStringEncoding];
In Swift 4
let emoji = "😃"
let unicodedData = emoji.data(using: String.Encoding.utf8, allowLossyConversion: true)
let emojiString = String(data: unicodedData!, encoding: String.Encoding.utf8)
I assume that:
You are reading this RTF data from a file or other external source.
You are parsing it yourself (not using, say, AppKit's built-in RTF parser).
You have a reason why you're parsing it yourself, and that reason isn't “wait, AppKit has this built in?”.
You have come upon \u… in the input you're parsing and need to convert that to a character for further handling and/or inclusion in the output text.
You have ruled out \uc, which is a different thing (it specifies the number of non-Unicode bytes that follow the \u… sequence, if I understood the RTF spec correctly).
\u is followed by hexadecimal digits. You need to parse those to a number; that number is the Unicode code point number for the character the sequence represents. You then need to create an NSString containing that character.
If you're using NSScanner to parse the input, then (assuming you have already scanned past the \u itself) you can simply ask the scanner to scanHexInt:. Pass a pointer to an unsigned int variable.
If you're not using NSScanner, do whatever makes sense for however you're parsing it. For example, if you've converted the RTF data to a C string and are reading through it yourself, you'll want to use strtoul to parse the hex number. It'll interpret the number in whatever base you specify (in this case, 16) and then put the pointer to the next character wherever you want it.
Your unsigned int or unsigned long variable will then contain the Unicode code point value for the specified character. In the example from your question, that will be 0x10003, or U+10003.
Now, for most characters, you could simply assign that over to a unichar variable and create an NSString from that. That won't work here: unichars only go up to 0xFFFF, and this code point is higher than that (in technical terms, it's outside the Basic Multilingual Plane).
Fortunately, *CF*String has a function to help you:
unsigned int codePoint = /*…*/;
unichar characters[2];
NSUInteger numCharacters = 0;
if (CFStringGetSurrogatePairForLongCharacter(codePoint, characters)) {
numCharacters = 2;
} else {
characters[0] = codePoint;
numCharacters = 1;
}
You can then use stringWithCharacters:length: to create an NSString from this array of 16-bit characters.
Use this:
NSString *myUnicodeString = #"\u10003";
Thanks to modern Objective C.
Let me know if its not what you want.
NSString *strUnicodeString = "\u2714";
NSData *unicodedStringData = [strUnicodeString dataUsingEncoding:NSUTF8StringEncoding];
NSString *emojiStringValue = [[NSString alloc] initWithData:unicodedStringData encoding:NSUTF8StringEncoding];
I need to form a POST NSURLRequest and I need to pass into the request this structure:
inspection (an array of NSDictionaries with string keys and values)
property (same structure as array1)
subcategories (an array of NSDictionaries where each dictionary can have an array of values for a certain key)
Here is how my requestString looks like after I concat everything:
?inspection[name]=inspection_name&inspection[address]=address_value&...&property[type]=property_type&....&subcategories[0][questions][0][title]=title_value&subcategories[0][questions][1][title]=title_value1&...&subcategories[1][questions][0][title]=title_valuen&...
For inspection and property array I've also tried inspection[][name]=inspection_name, property[][address]=property_address
While I'm forming that requestString I'm escaping each parameter using this method:
static NSString *escapeParam(NSString *param) {
param = [param stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
param = [param stringByReplacingOccurrencesOfString:#"&" withString:#"%26"];
param = [param stringByReplacingOccurrencesOfString:#"=" withString:#"%3D"];
param = [param stringByReplacingOccurrencesOfString:#"?" withString:#"%3F"];
return param;
}
There fore something like subcategories[0][questions][0][title]=title_value becomes subcategories%5B0%5D%5Bquestions%5D%5B0%5D%5Btitle%5D=title_value
Obviously I'm doing something wrong and don't know how to properly form this requestString because when I fire the request I get HTTP Error 400 Bad request in response.
Can someone point me in the right direction?
Thanks a bunch!
First of all &,=,? don't need to be encoded, these chars are supported.
Second of all, you don't need to add stringByAddingPercentEscapesUsingEncoding to the whole body, I think you don't need to add it at all because the server should support escaping chars. If the server doesn't support escaping chars, you should apply the stringByAddingPercentEscapesUsingEncoding only on the values, the keys should be as tehy are, something like
inspection[][name]=[inspection_name stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
This will handle eventual escaping chars from your values, but the keys should't have escaping characters since they are created to work on the server.
I have a string that I fetched from an Apache server over HTTP:
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
...
I need to make that string a UTF16 string. I don't want to turn it into NSData. I need to keep it NSString and I need it to be in UTF16.
I would be happy to put it in an NSData object even, if I could do it as UTF16. I'm doing something similar now:
[self.returnedData appendData:data];
But that still transfers it as UTF8.
It's probably simple and I'm missing it. But I don't find it in the Apple docs or this site, and my Google-Fu has failed me.
What am I missing? How do I do that?
Thanks for your time and help.
EDIT:
Ok. All of what you and Justin have said makes sense and makes things make more sense.
So this is what I am doing. It seems to be correct from this line but I wanted to make sure I am understanding you correctly.
NSData *resultData = [self. result dataUsingEncoding:NSUTF16LittleEndianStringEncoding];
NSString *resultStr = [[NSString alloc] initWithData:resultData encoding:NSUTF16LittleEndianStringEncoding];
NSString *md5Result = [[NSString stringWithFormat:#"%#",[resultStr MD5]] uppercaseString];
NSLog(#"md5Result = %#",md5Result);
That last part is what I am doing with the string after it's UTF-16. I have a category that makes it an MD5 hex string similar to http://blog.blackwhale.at/?tag=hmac
Thanks again. I'll bump you guys both and say this is the right answer.
A string is a string is a string. The encoding refers to how its encoded and decoded to and from NSData. #"blah" is the same as #"blah". There is no UTF8 or UTF 16 for either of those.
Added
So you can do [#"myString" dataUsingEncoding:NSUTF16StringEncoding];
If you convert that back to a string, you'll still have #"myString"
Answer last question in comment below.
So when you POST to a server the server body is encoded data. So what you wanted to do is do what ever you want to the string. THEN convert the string to data using a particular encoding, in your case, NSUTF16StringEncoding or NSUTF16LittleEndianStringEncoding. You are NOT creating UTF-16 string. You are converting a unicode string to UTF-16 encoded data. This is what you need to do then.
NSData *postBody = [[[self.result MD5] uppercaseString] dataUsingEncoding:NSUTF16LittleEndianStringEncoding];
If you need to add more data to the postBody create NSMutableData instead and append the new data as needed.
NSString holds a buffer of whatever encoding it chooses - that may be UTF-8, UTF-16, or something else.
If you just want to create an NSString from a UTF-16 sequence, try NSUTF16BigEndianStringEncoding or one of its relatives.
I have an NSDictionary with utf8 strings as objects. Printing the objects prints the special characters as they should.
But utf8 characters do not get correctly printed out when I convert the dictionary to a string with the description method.
NSDictionary *test = [NSDictionary dictionaryWithObject:#"Céline Dion" forKey:#"bla"];
NSLog(#"%#",[test objectForKey:#"bla"]); // prints fine
NSLog(#"%#",test); // does not print fine, é is replaced by \U00e
NSLog(#"%#",[test description]); // also does not print fine
How can I print the NSDictionary while preserving utf8 characters?
I wouldn't worry about what -description does, it's just for debugging.
Technically, you don't have UTF-8 strings. You have strings (which are Unicode). You don't know what NSString uses internally, and you shouldn't care. If you want a UTF-8 string (like when you're passing to a C API), use -UTF8String.
There is a way, but I can't check it at the moment:
NSString *decodedString = [NSString stringWithUTF8String:[[test description] cStringUsingEncoding:[NSString defaultCStringEncoding]]];
NSLog(#"%#",decodedString);