objective-c - NSURLConnection sendSynchronousRequest 的问题

Question

我需要在两个搜索引擎中实现同时搜索。我有两个功能: *- (void) searchYoutube: (NSString )text 和 *- (void) searchYahoo:(NSString )text

(void) searchYahoo:(NSString *)text{

   NSString *urlString = [NSString stringWithFormat:@"http://search.yahooapis.com/WebSearchService/V1/webSearch?appid=%@&output=json&query=%@&results=30", YahooAppId, text];
NSLog(@"URL zaprosa: %@",urlString);

//Create NSURL string from formatted string
NSURL *url = [NSURL URLWithString:urlString];


NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
NSURLConnection *connection = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
if (connection)
{
    NSLog(@"Data will be received from URL: %@", url);
}
else
{
    NSLog(@"Data couldn't be received from URL: %@", url);
}}

函数-searchYoutube:与上面类似。但是当我用这两个函数调用查询时，我看到

2011-06-26 14:06:27.523 TrueSearcher[5373:207] URL query: http://gdata.youtube.com/feeds/api/videos?q=os&start-index=1&max-results=30&alt=jsonc&v=2
2011-06-26 14:06:27.874 TrueSearcher[5373:207] Data will be received from URL: http://gdata.youtube.com/feeds/api/videos?q=os&start-index=1&max-results=30&alt=jsonc&v=2
2011-06-26 14:06:27.875 TrueSearcher[5373:207] URL query: http://search.yahooapis.com/WebSearchService/V1/webSearch?appid=jwGJkT32&output=json&query=os&results=30
2011-06-26 14:06:29.010 TrueSearcher[5373:207] Data will be received from URL: http://search.yahooapis.com/WebSearchService/V1/webSearch?appid=jwGJkT32&output=json&query=os&results=30

仅此而已。我无法接收任何数据。我做错了什么？

Answer 1

嗯，

 NSURLConnection *connection = [NSURLConnection 
    sendSynchronousRequest:request returningResponse:nil error:nil];

错了。 sendSynchronousRequest 返回带有响应数据的 (NSData *)。所以，做你想做的事情的更正确的方法是

  NSData *responseData = [NSURLConnection 
    sendSynchronousRequest:request returningResponse:nil error:nil];

然后您读取来自 responseData 的响应。

您还应该查看 NSURLConnection 的文档.