Question

开始与实现Oauth的Web服务API进行通信。实现了OauthConsumer并开始使用GET方法构建和检索数据。一切正常，直到我尝试使用XML主体的POST方法起初我开始咆哮错误的树木，直到我发现了一些帮助我更接近解决问题的金块

我需要设置Content-Type

我需要在设置setHTTPBody方法之前准备请求

OAMutableURLRequest *request = [[OAMutableURLRequest alloc] initWithURL:url
                   consumer:consumer
                      token:accessToken
                      realm:nil
          signatureProvider:nil];


[request setHTTPMethod:@"POST"];
[request setValue:@"application/xml" forHTTPHeaderField:@"Content-Type"];
[request prepare];

[request setHTTPBody:[xml dataUsingEncoding:NSUTF8StringEncoding]];

OADataFetcher *fetcher = [[OADataFetcher alloc] init];

[fetcher fetchDataWithRequest:request
                 delegate:self
        didFinishSelector:@selector(apiTicket:didPostInvoice:)
          didFailSelector:@selector(apiTicket:didFailPostInvoice:)];

然后我在调用fetchDataWithRequest时开始获取NSRangeException。

如何阻止这种情况发生？

Answer 1

事实证明问题是fetchDataWithRequest调用了prepare方法，这解除了导致获取数据的所有好工作。解决方案是创建一个fetchDataWithPreparedRequest方法，以确保不再调用prepare

@implementation OADataFetcher
...

- (void)fetchDataWithPreparedRequest:(OAMutableURLRequest *)aRequest delegate:(id)aDelegate didFinishSelector:(SEL)finishSelector didFailSelector:(SEL)failSelector {
        [request release];
        request = [aRequest retain];
        delegate = aDelegate;
        didFinishSelector = finishSelector;
        didFailSelector = failSelector;

//      [request prepare];

        connection = [[NSURLConnection alloc] initWithRequest:aRequest delegate:self];
}

@end

调用OADataFetcher fetchDataWithRequest POST时出现NSRangeException

1 个答案: