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？