我正在使用iOS 7的Multiper Connectivity Framework在两台设备之间发送文件.我正在使用NSStreams来传输文件,就像我之前尝试使用MCSession的sendData:toPeers:withMode真的不可靠.不幸的是,我得到的传输速度真的很慢,大约100kb / s,这对于我正在开发的应用程序来说是不行的.这是我的输入和输出流委托方法,这是文件传输发生的地方.
输出流(在流的代表中)
...//previous code case NSStreamEventHasSpaceAvailable: { //we will only open the stream when we want to send the file. NSLog(@"Stream has space available"); //[self updateStatus:@"Sending"]; // If we don't have any data buffered,go read the next chunk of data. if (totalBytesWritten< outgoingDataBuffer.length) { //more stuff to read int towrite; int diff = outgoingDataBuffer.length-packetSize; if (diff <= totalBytesWritten) { towrite = outgoingDataBuffer.length - totalBytesWritten; } else towrite = packetSize; NSRange byteRange = {totalBytesWritten,towrite}; uint8_t buffer[towrite]; [outgoingDataBuffer getBytes:buffer range:byteRange]; NSInteger bytesWritten = [outputStream write:buffer maxLength:towrite]; totalBytesWritten += bytesWritten; NSLog(@"Written %d out of %d bytes",totalBytesWritten,outgoingDataBuffer.length); } else { //we've written all we can write about the topic? NSLog(@"Written %d out of %d bytes",outgoingDataBuffer.length); [self endStream]; } // If we're not out of data completely,send the next chunk. } break;
输入流
- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode { switch(eventCode) { case NSStreamEventHasBytesAvailable: { NSLog(@"Bytes Available"); //Sent when the input stream has bytes to read,we need to read bytes or else this wont be called again //when this happens... we want to read as many bytes as we can uint8_t buffer[1024]; int bytesRead; bytesRead = [inputStream read:buffer maxLength:sizeof(buffer)]; [incomingDataBuffer appendBytes:&buffer length:bytesRead]; totalBytesRead += bytesRead; NSLog(@"Read %d bytes,total read bytes: %d",bytesRead,totalBytesRead); }break; case NSStreamEventEndEncountered: { UIImage *newImage = [[UIImage alloc]initWithData:incomingDataBuffer]; [[self.detailViewController imageView] setImage:newImage]; NSLog(@"End Encountered"); [self closeStream]; //this should get called when there aren't any more bytes being sent down the stream } } }
有没有办法通过多线程或使用稍微修改的NSStream子类来加速此文件传输,这些子类使用异步套接字?
解决方法
有几件事我注意到导致缓慢的文件传输:
>在会话中使用非空投兼容设备(http://en.wikipedia.org/wiki/AirDrop)
> WiFi问题(饱和网络,路由器问题,频道等)
iPhone上的iPhone 5S,iPad Air和iPhone模拟器之间的速度(以及体面的意思是500K /秒).
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