Question

我从不使用网络API，也不知道我对此有何看法。我阅读了FAROO Return Values doc，但我不明白我如何在cocoa中获得结果数组（或字典）。请有人给我示例或教程如何在objective-c中使用Faroo API（或其他Web API）。

谢谢。

Answer 1

特别要使用Web API和FAROO API，我使用NSURLConnection类和NSURLConnectionDelegate协议：

- (IBAction)search:(id)sender {

    NSString* requestString = [NSString stringWithFormat:@"http://www.faroo.com/api?q=%@&start=1&length=10&l=ru&src=news&f=xml&YOUR_API_KEY",[searchField stringValue]];
   // NSLog(@"str %@",requestString);

    NSURL* requestUrl = [NSURL URLWithString:requestString];
    NSURLRequest* searchRequest = [NSURLRequest requestWithURL:requestUrl cachePolicy:NSURLRequestReloadRevalidatingCacheData timeoutInterval:60];

    [self performSelectorOnMainThread:@selector(startConnectionWithRequest:) withObject:searchRequest waitUntilDone:NO];
}

- (void)startConnectionWithRequest:(NSURLRequest*)request {
    NSURLConnection* connection = [[NSURLConnection alloc]initWithRequest:request delegate:self startImmediately:YES];
    if (connection) {
      //update GUI and do something...
        theData = [NSMutableData data];

    }
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    NSLog(@"Receive data");
    [theData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
        NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
        NSLog(@"Http status code %ld",(long)[httpResponse statusCode]);
    }

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSLog(@"Finish");
    //do something with data and update GUI
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    NSAlert* searchFailedAlert = [NSAlert alertWithError:error];
    [searchFailedAlert runModal];
}

Answer 2

另一种做法是将自己的遗漏方法声明为相关类的一个类别。这将使编译器停止抱怨没有找到该方法，但当然您仍然需要运行时检查您已经在做以避免实际调用该方法。您可能还希望使用可用性宏来包装此类声明，以便在您使用10.5 / 10.6 SDK之后将忽略它，并且您将无法获得不同的编译器投诉。这看起来像这样：

#if MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_10_4 //ignore when compiling with the 10.5 SDK or higher
@interface NSPropertyListSerialization(MissingMethods)

+ (NSData *)dataWithPropertyList:(id)plist format:(NSPropertyListFormat)format options:(NSPropertyListWriteOptions)opt error:(NSError **)error;

@end
#endif

如何在cocoa中使用Faroo搜索API

2 个答案: