我从我的服务器上获取了一个有效的响应：
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
// Append the new data to the instance variable you declared
//[_responseData appendData:data];
NSString *responseBody = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"%@",responseBody);
if(data != NULL)
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,(unsigned long)NULL),^(void) {
NSError *error = nil;
//NSMutableArray *jsonArray = [[CJSONDeserializer deserializer] deserializeAsArray:[responseBody dataUsingEncoding:NSUTF8StringEncoding] error:&error];
NSMutableArray *jsonArray = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
if (error)
{
NSLog(@"JSONObjectWithData error: %@",error);
[delegate onErrorGetArrayFromServer];
}
else
[self parseJSON:jsonArray];
});
}
else
{
if([delegate respondsToSelector:@selector(onErrorGetArrayFromServer)])
{
[delegate onErrorGetArrayFromServer];
}
}
}
回复如下：
[{"id":"37","id_estado":"1","id_categoria":"1","nombre":"fer","email":"asd@gmail.com","fecha":"2014-07-16 11:25:00","observaciones":"as dasd asdasd sasd","latitud":"37.619636","longitud":"-4.318449","foto":"images\/default.jpg"},{"id":"36","id_categoria":"6","nombre":"Fernando","email":"","fecha":"2014-07-16 10:32:45","observaciones":"que","latitud":"37.6178690439634","longitud":"-4.3238141387701","foto":"images\/default.jpg"}]
它抛出了我的错误：
JSONObjectWithData error: Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (Invalid value around character 0.) UserInfo=0x9e0f610 {NSDebugDescription=Invalid value around character 0.}
我尝试了其他库(CJSON),它给我发错误：
JSONObjectWithData error: Error Domain=kJSONScannerErrorDomain Code=-202 "Could not scan array. Could not scan a value." UserInfo=0xa15c0e0 {snippet=!HERE>![{"id":"37","id_esta,location=0,NSLocalizedDescription=Could not scan array. Could not scan a value.,character=0,line=0}
我的服务器是一个REST服务器,我的Android应用程序运行良好.
_解决了_
感谢@Himanshu Joshi：
为什么要在didReceiveData中解析数据？数据未完全下载,您必须在那里附加数据.解析connectionDidFinishLoading中的数据：委托方法 –
我解析了connectionDidFinishLoading中的数据：一切都很顺利.
解决方法
我遇到了同样的问题,但这是因为我的初始网址不正确.
在解析JSON之前,需要检查响应.它可能会告诉你它没有找到.
我使用这些方法来调试这个,并使用更简单的方法来处理Web请求：
// Asynchronous fetch the JSON and call the block when done
NSURLSessionDataTask *downloadTask =
[[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:
^(NSData *data,NSURLResponse *response,NSError *error)
{
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
if ([httpResponse statusCode]!=200)
{
// log [response description]
// log [NSString stringWithUTF8String:[data bytes]]
return;
}
NSDictionary* jsonDic =
[NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingAllowFragments
error:&error];
if (!jsonDic)
{
return;
}
// process the JSON
}];
[downloadTask resume];
