ios - 如何计算发送/接收的字节数，包括 iOS HTTP 连接中的 TCP/IP 开销？

Question

我正在使用 NSURLConnection 与服务器执行 HTTP 通信。我希望找出我的应用程序发送/接收的确切字节数，包括 TCP/IP 开销。经过大量研究，还没有找到任何关于如何实现这一目标的有用信息。

如果使用它可以帮助我解决这个问题，我愿意切换到 CFStream。提前致谢。

Answer 1

In my .h of the controller I declare two vars:

NSMutableData *_data;
float downloadSize;

Also don't forget the delegates in the .h

@interface SomeViewController : UIViewController <NSURLConnectionDataDelegate, NSURLConnectionDelegate>

Then in my .m:

- (void)connection: (NSURLConnection*) connection didReceiveResponse: (NSHTTPURLResponse*) response
    {
        NSInteger statusCode_ = [response statusCode];
        if (statusCode_ == 200) {
            downloadSize = [response expectedContentLength];
        }
    }
    - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
        if(!_data) _data = [[NSMutableData data]init];
        [_data appendData:data];
        progressView.progress =  ((float) [_data length] / (float) downloadSize);
    }

    - (void)connectionDidFinishLoading:(NSURLConnection *)connection {
          unsigned char byteBuffer[[_data length]];
          [_data getBytes:byteBuffer];
          [_data writeToFile:pdfPath atomically:YES];

    }

This is my controller to download a pdf file. But it could be anything really. When it has a response, it gets the expected length, then every time it receives data, it appends it to my mutable data and then compares it to the expected size.

Hope this helps :D