Error Domain=NSCocoaErrorDomain Code=3840 “Invalid value around character 0.” UserInfo={NSDebugDescription=Invalid value around character 0.}

问题:

I am trying to upload image by converting image to base64 format. And i am getting below error.

Error Domain=NSCocoaErrorDomain Code=3840 "Invalid value around character 0." UserInfo={NSDebugDescription=Invalid value around character 0.}

Please refer my code

NSData *imageData = UIImagePNGRepresentation(image); NSString *imageDataString = [imageData base64EncodedString]; 

Here is the Post request method

- (id) postRequest:(NSURL *)postURL postString:(NSString *)postString  {     NSError * error=nil;     NSURLResponse * urlResponse;     NSData *myRequestData = [ NSData dataWithBytes: [ postString UTF8String ] length: [ postString length ]];     NSMutableURLRequest * request =[[NSMutableURLRequest alloc]initWithURL:postURL cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];     [request setHTTPBody: myRequestData];     [request setHTTPMethod:@"POST"];     [request setValue:@"application/json; charset=utf-8" forHTTPHeaderField:@"Content-Type"];      NSData * data =[NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];     if (!data)     {         return nil;     }      id jsonnResponse =[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];     return jsonnResponse; } 

回答1:

Error 3840 ... Invalid value around character 0.

simply means that the (JSON) string is empty, you got nothing from the server.

To get NSData from a string there is a more convenient API:

NSData *myRequestData = [postString dataUsingEncoding:NSUTF8StringEncoding]; 

Actually a base64 formatted string is not JSON as specified in the header. That might cause the problem.

回答2:

The problem in this line of code that NSJSONSerialization can't parse your response

id jsonnResponse =[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; 

And the error indicates that your response from server not correctly.

The response from the server must be valid JSON with a top level container like an array or dictionary. Check you response in http://jsonlint.com

文章来源: Error Domain=NSCocoaErrorDomain Code=3840 “Invalid value around character 0.” UserInfo={NSDebugDescription=Invalid value around character 0.}