JSON parse error in iOS - ios

Question

I am trying to parse json response(which I get from result tag of a SOAP webservice response) as shown in pictures with following lines.
NSString *soapMessage = [NSString stringWithFormat:#"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
"<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
"<soap:Body>"
"<GetPhotoSession xmlns=\"http://tempuri.org/\">"
"<UserID>%#</UserID>"
"<photoSessionID>%#</photoSessionID>"
"</GetPhotoSession>"
"</soap:Body>"
"</soap:Envelope>",[HelperClass retrieveStringForKey:kUserID],self.currentSession.sessionID];
NSURL *url = [NSURL URLWithString:kBaseURL];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
NSString *msgLength = [NSString stringWithFormat:#"%lu", (unsigned long)[soapMessage length]];
[theRequest addValue: #"text/xml; charset=utf-8" forHTTPHeaderField:#"Content-Type"];
[theRequest addValue: #"http://tempuri.org/GetPhotoSession" forHTTPHeaderField:#"SOAPAction"];
[theRequest addValue: msgLength forHTTPHeaderField:#"Content-Length"];
[theRequest setHTTPMethod:#"POST"];
[theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if( theConnection ) {
self.webResponseData = [NSMutableData data];
}else {
NSLog(#"Some error occurred in Connection");
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[self.webResponseData setLength:0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[self.webResponseData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(#"Some error in your Connection. Please try again.");
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSLog(#"Received Bytes from server: %d", [self.webResponseData length]);
NSString *myXMLResponse = [[NSString alloc] initWithBytes: [self.webResponseData bytes] length:[self.webResponseData length] encoding:NSUTF8StringEncoding];
NSLog(#"%#",myXMLResponse);
NSError *errorPointer;
NSDictionary *dict = [XMLReader dictionaryForXMLString:myXMLResponse error:&errorPointer];
NSString *jsonData = dict[#"soap:Envelope"][#"soap:Body"][#"GetPhotoSessionResponse"][#"GetPhotoSessionResult"][#"text"];
NSData *data = [jsonData dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:&errorPointer];
NSLog(#"%#",[json objectForKey:#"Head"]);
}
But I am getting nil in "json" object. Here is the pastie link for JSON response http://pastie.org/9799331. Following is the description of error pointer.
Printing description of errorPointer:
Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=0x7d0156a0 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

Answer 1

Is this your own web service or an existing one? If this is your own, are you sure your JSON is actually correct?
I believe the problem is here:
"ImageBase64Data": "/9j/4AAQSkZJRgABAQA .... blah blah ==
"
Note the key point here. That the closing double quote is on the next line. It should be
"ImageBase64Data": "/9j/4AAQSkZJRgABAQA .... blah blah =="
For future reference, it is far easier if you cut and paste the JSON payload text in your question versus showing an image.
So grabbing your data from here:
http://pastie.org/9799331#2,22,482
I have run it through this code:
NSError *error = nil;
NSString *path = [[NSBundle mainBundle] pathForResource:#"badjson" ofType:#"txt"];
NSString *jsonStr = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
// jsonStr = [[jsonStr componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]] componentsJoinedByString:#""];
NSData *jsonData = [jsonStr dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&error];
NSLog(#"Error is %#", error);
NSLog(#"JSON is %#", json);
Note that I have one commented out line right now. When I do this, it fails. However the failure is different than what you listed above. I get.
Error is Error Domain=NSCocoaErrorDomain Code=3840 "The operation
couldn’t be completed. (Cocoa error 3840.)" (Unescaped control
character around character 120.) UserInfo=0x7f9519f71510
{NSDebugDescription=Unescaped control character around character 120.}
If I uncomment out that line, then it works. Only showing a snippet of the output:
2014-12-26 12:03:35.020 Sample[49732:6379864] Error is (null)
2014-12-26 12:03:35.022 Sample[49732:6379864] JSON is {
Head = (
{
ID = 1092;
ImageBase64Data = "/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDACAWGBwYFCAcGhwkIiAmMFA0MCwsMGJGSjpQdGZ6eHJmcG6AkLicgIiuim5woNqirr7EztDOfJri8uDI8LjKzsb/
Your data is using an base64 output which uses newlines to delimit each encoded line. This is why you see at the end the text that looks like:
==
","ImageName"
You'll also notice the vast majority of lines in the Base64 look uniform .. because of this delimiting.
Strip out the newlines using this (you need to modify it for you code)
jsonStr = [[jsonStr componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]] componentsJoinedByString:#""];
If that doesn't work, then you need to provide some more info:
-Is the output taken from Xcode console?
-Add in your code where the NSLog exists to get the output (if you don't have it, then please add one).
-Once you add the NSLog, provide that output
While it may seem like you've "already provided that info", there is obviously a gap in information. Else I would expect to see the same NSError output. So we're either missing steps, or maybe there is some other variance. For example, I'm running this in an iOS 8 simulator. Not that it should matter too much, but there is always a possibility that you're running on an older version of iOS that parses the JSON differently.