NSInvalidArgumentException在发送POST请求HTTP

我写简单的代码是给我从HTTP服务器响应发送POST请求之后，但如果我尝试一切移动到另一个文件的XCode表明我这个错误：NSInvalidArgumentException在发送POST请求HTTP

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'data parameter is nil'

这里有两个文件我使用，使这项工作：

#import "HTTPRequestHandler.h" 

@interface HTTPRequestHandler() 

@property (strong, nonatomic) NSURL *requestURL; 
@property (strong, nonatomic) NSData *httpBody; 
@property (strong, nonatomic) NSMutableData *responseData; 

@end 

@implementation HTTPRequestHandler 

- (id)initWithURL:(NSString *)url body:(NSString *)body 
{ 
    if (self = [super init]) { 
     self.requestURL = [[NSURL alloc] initWithString:url]; 
     self.httpBody = [body dataUsingEncoding:NSUTF8StringEncoding]; 
    } 

    return self; 
} 

- (void)makeConnectionWithRequest 
{ 
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:self.requestURL]; 
    [request setHTTPMethod:@"POST"]; 
    [request setHTTPBody:self.httpBody]; 
    [NSURLConnection connectionWithRequest:request delegate:self]; 
} 

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
{ 
    NSLog(@"Dane doszły 1"); 
    [self.responseData setLength:0]; 
} 

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
{ 
    NSLog(@"Dane doszły 2"); 
    [self.responseData appendData:data]; 
} 

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    NSLog(@"Dane doszły 3"); 


    NSDictionary *recievedData = [NSJSONSerialization JSONObjectWithData:self.responseData options:kNilOptions error:nil]; 
    NSLog(@"%@", [recievedData description]); 
} 

@end

，第二个：

#import "ViewController.h" 
#import "HTTPRequestHandler.h" 

@interface ViewController() 

@end 

@implementation ViewController 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    HTTPRequestHandler *request = [[HTTPRequestHandler alloc] initWithURL:@"http://own-dev1.railwaymen.org:4006/api/get_grant_key" 
                    body:@"[email protected]&password=password"]; 
    [request makeConnectionWithRequest]; 
} 

@end

来源

2013-05-16 cojoj

奥基，明白了！刚刚忘了self.responseData = [NSMutableData data];

来源

2013-05-16 23:09:40 cojoj

NSInvalidArgumentException在发送POST请求HTTP

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