Ios 发送HTTP POST请求错误
我在正确获取JSON时遇到问题。这就是我查询数据库的方式Ios 发送HTTP POST请求错误,ios,objective-c,json,http-headers,Ios,Objective C,Json,Http Headers,我在正确获取JSON时遇到问题。这就是我查询数据库的方式 NSString *url = [NSString stringWithFormat:@"http://www.myURL.com/list?key=%@", myKey] NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL
NSString *url = [NSString stringWithFormat:@"http://www.myURL.com/list?key=%@", myKey]
NSMutableURLRequest *request = [[NSMutableURLRequest alloc]
initWithURL:[NSURL
URLWithString:url]];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];
NSURLConnection *connection;
connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
与
从Get字符串NSLog中,我得到两个响应。我解释得更好。如果我在浏览器中键入请求URL,我会看到整个JSON响应,而从我的NSLog中,我会得到一部分响应,另一部分仍然在同一个NSLog中,但经过一段时间后,会比第一个NSLog更慢
例如:2014-10-11 19:38:58.401myapp[1607:365755]Get dict(这里我得到了JSON的第一部分)
2014-10-11 19:38:58.401myapp[1607:365755]Get dict(这里是我的JSON的第二部分也是最后一部分)
为什么我没有得到一个完整的NSLog回复?我肯定我弄错了什么,但我真的不知道是什么。谢谢。鉴于可能需要多次调用
didReceiveData
来处理此问题,您应该将数据的接收与解析分开:
NSMutableData
属性:
@property (nonatomic, strong) NSMutableData *receivedData;
self.receivedData = [NSMutableData data];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
receivedData
中,除了附加数据外,什么也不做:
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data {
[self.receivedData appendData:data];
// if you want to log it, you can do:
NSString *stringr = [[NSString alloc] initWithData:self.receivedData encoding:NSASCIIStringEncoding];
NSLog(@"Get string %@", stringr);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSError *error;
NSDictionary *thejson = [NSJSONSerialization JSONObjectWithData:self.receivedData options:kNilOptions error:&error];
NSLog(@"Get dict %@", thejson); ///THIS SHOULD NOT FAIL IF VALID JSON
}
我有这个密码。对我来说,它工作得很好,这是异步的(对我来说更好) 如果您使用我的代码,我建议您创建一个协议来接收答案。在这门课上有一个例子
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSError *error;
NSDictionary *thejson = [NSJSONSerialization JSONObjectWithData:self.receivedData options:kNilOptions error:&error];
NSLog(@"Get dict %@", thejson); ///THIS SHOULD NOT FAIL IF VALID JSON
}
-(void)preparePostHttpRequestAsynchronous:(NSURL*)urlString
json:(NSMutableDictionary *)jsonDictionary
andIdentifier:(NSInteger)identifier
{
NSString *newUrlString = [jsonDictionary jsonStringFromDictionary:jsonDictionary ];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:urlString];
NSString *post = newUrlString;
NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
[request setValue:[NSString stringWithFormat:@"%d", [postData length]] forHTTPHeaderField:@"Content-Length"];
[request setTimeoutInterval: 20];
[request setHTTPMethod:@"POST"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-type"];
[request setHTTPBody:postData];
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *r, NSData *data, NSError *e)
{
NSLog(@"Error %@",e);
if (e || !data){
NSLog (@"Error %@",e);
return;
}
NSError *jsonParsingError = nil;
NSMutableDictionary *jsonArray = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingMutableContainers|NSJSONReadingAllowFragments|kNilOptions error:&jsonParsingError];
// here you can do whatever with your data
// i recomend you to use a Protocol or something like that
}];
}