NSData to NString conversion problem?

I know this is an old topic but it came up when I was looking for the solution today. I've solved it now so I'm just posting it for others who might run into this page looking for a solution Here's what I do in an asynchronous request: I first store the text encoding name in connection:didReceiveResponse using encodingName = NSString alloc initWithString:response textEncodingName Then later in my connectionDidFinishLoading method I used NSStringEncoding encoding = CFStringConvertEncodingToNSStringEncoding(CFStringConvertIANACharSetNameToEncoding((CFStringRef) encodingName)); NSString *payloadAsString = NSString alloc initWithData:receivedData encoding:encoding.

I know this is an old topic but it came up when I was looking for the solution today. I've solved it now so I'm just posting it for others who might run into this page looking for a solution. Here's what I do in an asynchronous request: I first store the text encoding name in connection:didReceiveResponse using encodingName = NSString alloc initWithString:response textEncodingName; Then later in my connectionDidFinishLoading method I used NSStringEncoding encoding = CFStringConvertEncodingToNSStringEncoding(CFStringConvertIANACharSetNameToEncoding((CFStringRef) encodingName)); NSString *payloadAsString = NSString alloc initWithData:receivedData encoding:encoding.

To Gordon - the NSData generated like that: NSData *theData = NSURLConnection sendSynchronousRequest:theRequest returningResponse:&theResponse error:&theError; When I say that the conversion fails I mean that NSString alloc initWithData:temp encoding:NSUTF8StringEncoding returns nil To Ed - Here is my code (I got the Byte array from NSData, found what I need, and constructed another Byte array from that - turned it to NSData and then attempted to convert it to NSString... sounds kinda complicated...) -(NSString *)UTF8StringFromData:(NSData *)theData{ Byte *arr = theData bytes; NSUInteger begin1 = self findIndexOf:@"" bArr:arr size:theData length+4; NSUInteger end1 = self findIndexOf:@"" bArr:arr size:theData length; Byte *arr1 = (Byte *)malloc(sizeof(Byte)*((end1-begin1+1))); NSLog(@"%d %d",begin1, end1); int j = 0; for (int I = begin1; I.

I've moved this information to the question, it shouldn't really be here in an answer. – Logan Capaldo Sep 12 '09 at 17:51.

The most likely reason for the conversion to fail is because the bytes don't represent a valid UTF-8 string.

I checked - it's UTF8. How would you do it? – Alex1987 Sep 12 '09 at 18:32.

I'm not sure if you're aware, you don't really need to copy the array to another array before putting it into the new NSData object. -(NSString *)UTF8StringFromData:(NSData *)theData { Byte *arr = theData bytes; NSUInteger begin1 = self findIndexOf:@"" bArr:arr size:theData length+4; NSUInteger end1 = self findIndexOf:@"" bArr:arr size:theData length; Byte *arr1 = arr + begin1; NSData *temp = NSData dataWithBytes:arr1 length:end1 - begin1; return NSString alloc initWithData:temp encoding:NSUTF8StringEncoding; } As for your particular problem, I would try looking through the data manually using the debugger. Put a breakpoint after you have your array (arr1).

When you hit it, open up the GDB console and try this: print (char *)arr1 With your code, it should print out the string you're trying to get. (With the code I gave above, it won't stop after the . It'll just keep going).

If the result is not what you expect, then there's something wrong with the data, or perhaps with your begin1 and end1 boundaries.

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