Objective-C中同步调用WebService的方法

// 发 送同步请求, 这里得returnData就是返回得数据了    
       NSData *returnData = [NSURLConnection sendSynchronousRequest:urlRequest                                                      returningResponse:nil error:nil];  
  
       NSString * rtnString =  [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];  
       DLog(@"同步调用后，返回的内容是：%@", rtnString);  

异步调用的方法可以查看 这个

http://www.zhaorong.me/archives/1274

RemoteMethodCall * rpc = [[[RemoteMethodCall alloc] init] autorelease];  
NSMutableURLRequest *urlRequest = [rpc getCustomerActivation:self.udid];  
  
//请求  
NSURLConnection *theConnection = [[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self] autorelease];  
  
theConnection = nil;  

需要实现 以下几个 异步方法
- (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSHTTPURLResponse*)response
- (void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data
- (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error
- (void)connectionDidFinishLoading:(NSURLConnection *)connection