ObjectiveC 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.voidcn.com/article/p-belzlonu-kq.html

    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