NSData to NSString converstion problem!

Question

Hi guys,

I'm getting an html file as NSData and need to parse it to extract some info. My approach was to convert it to NSString with UTF8 encoding (the html has non english characters, russian for example) - it failed. I used something like that:

NSString *respData = [NSString stringWithUTF8String:[theData bytes]];

but it returned nil.

The only thing that actually worked was

[NSString stringWithCString:[theData bytes] length:[theData length]];

but when it encounters russian characters for example it returns jibrish.

Then my next approach was to parse the byte array of the data, extract the bytes I need and somehow convert them to NSString. I tried something like that:

-(NSString *)UTF8StringFromData:(NSData *)theData{
 Byte *arr = [theData bytes];
 NSUInteger begin1 = [self findIndexOf:@"<li>" bArr:arr size:[theData length]]+4;
 NSUInteger end1 = [self findIndexOf:@"</li></ol>" bArr:arr size:[theData length]];
 Byte *arr1 = (Byte *)malloc(sizeof(Byte)*((end1-begin1+1)));
 int j = 0;
 for (int i = begin1; i < end1; i++){
  arr1[j] = arr[i];
  j++;
 }
 arr1[j]='\0';
 NSData *temp = [NSData dataWithBytes:arr1 length:j];
 return [[NSString alloc] initWithData:temp encoding:NSUTF8StringEncoding];
}

Answer 1

First of all here is my code

-(NSString *)UTF8StringFromData:(NSData *)theData{
 Byte *arr = [theData bytes];
 NSUInteger begin1 = [self findIndexOf:@"<li>" bArr:arr size:[theData length]]+4;
 NSUInteger end1 = [self findIndexOf:@"</li></ol>" bArr:arr size:[theData length]];
 Byte *arr1 = (Byte *)malloc(sizeof(Byte)*((end1-begin1+1)));
 int j = 0;
 for (int i = begin1; i < end1; i++){
  arr1[j] = arr[i];
  j++;
 }
 arr1[j]='\0';
 NSData *temp = [NSData dataWithBytes:arr1 length:j];
 return [[NSString alloc] initWithData:temp encoding:NSUTF8StringEncoding]; 
}

and second - I am getting the file contents from the web - so I can't be sure about anything. It's an html of a google translation if it helps...

Answer 2

Supposing you got a NSURLResponse* response and an NSData* data:

CFStringEncoding cfEncoding = CFStringConvertIANACharSetNameToEncoding((CFStringRef) [response textEncodingName]);
NSStringEncoding encoding = CFStringConvertEncodingToNSStringEncoding(cfEncoding);

NSString* string = [[NSString alloc] initWithData:data encoding:encoding];

// Do stuff here..

[string release];