1、不借助第三方库，用原生的objective-c如何实现ftp upload？
2、这是官方提供的一个方案：https://developer.apple.com/library/ios/documentation/Networking/Conceptual/CFNetwork/CFFTPTasks/CFFTPTasks.html#//apple_ref/doc/uid/TP30001132-CH9-SW2

typedef struct MyStreamInfo { CFWriteStreamRef writeStream; CFReadStreamRef readStream; CFDictionaryRef proxyDict; SInt64 fileSize; UInt32 totalBytesWritten; UInt32 leftOverByteCount; UInt8 buffer[kMyBufferSize]; } MyStreamInfo;

3、谁能给我一些建议呢？