将NSData复制到UnsafeMutablePointer (copy NSData to UnsafeMutablePointer)

 你好stackoverflowers。 我正在实现一个安全传输的包装器，我坚持使用一些C - > Swift语法。 
 
func sslReadCallback(connection: SSLConnectionRef,
    data: UnsafeMutablePointer<Void>,
    var dataLength: UnsafeMutablePointer<Int>) -> OSStatus
{
    //let bytesRequested = dataLength.memory
    let transportWrapper:SecureTransportWrapper = UnsafePointer(connection).memory
    let bytesRead:NSData = transportWrapper.readFromConnectionFunc(transportWrapper.connection)

    dataLength = UnsafeMutablePointer<Int>.alloc(1)
    dataLength.initialize(bytesRead.length)

    if (bytesRead.length == 0)
    {
        return OSStatus(errSSLClosedGraceful)
    }
    else
    {
        data.alloc(sizeof(bytesRead.length)) //<----compile error here
        return noErr
    }
}
 
 我已经标记了编译错误的位置。 我不怪错误，我在这里猜测：P。 我正在尝试将NSData复制到数据：UnsafeMutablePointer。 我怎么做？ 
 
 编译错误： 
 
 
 
 /Users/*/SecureTransportWrapper.swift:108:9：静态成员'alloc'不能用于'UnsafeMutablePointer'类型的实例（又名'UnsafeMutablePointer <（）>'） 
 
 
 万分感谢！ 
 
 ================ 
 
 更新：这是sslReadCallback应该做的api文档： 
 
 
 
 连接：连接参考。 
 
 
 data：返回时，您的回调应该使用从连接读取的数据覆盖此位置的内存。 
 
 
 dataLength：输入时，指向表示数据长度的整数的指针，以字节为单位。 返回时，您的回调应该用实际传输的字节数覆盖该整数。 
 
 
 摘自这里 

Hi there stackoverflowers. I'm implementing a wrapper for Secure Transport and I'm stuck on some of the C -> Swift syntax.
 
func sslReadCallback(connection: SSLConnectionRef,
    data: UnsafeMutablePointer<Void>,
    var dataLength: UnsafeMutablePointer<Int>) -> OSStatus
{
    //let bytesRequested = dataLength.memory
    let transportWrapper:SecureTransportWrapper = UnsafePointer(connection).memory
    let bytesRead:NSData = transportWrapper.readFromConnectionFunc(transportWrapper.connection)

    dataLength = UnsafeMutablePointer<Int>.alloc(1)
    dataLength.initialize(bytesRead.length)

    if (bytesRead.length == 0)
    {
        return OSStatus(errSSLClosedGraceful)
    }
    else
    {
        data.alloc(sizeof(bytesRead.length)) //<----compile error here
        return noErr
    }
}
 
I've marked the location of the compile error. I don't blame it for erring, I was kind of guessing here :P. I'm trying to copy the the NSData to the data:UnsafeMutablePointer. How do I do that?
 
Compile error:
 
 
 
/Users/*/SecureTransportWrapper.swift:108:9: Static member 'alloc' cannot be used on instance of type 'UnsafeMutablePointer' (aka 'UnsafeMutablePointer<()>')
 
 
Thanks a ton!
 
================
 
Update: here is the api doc for what the sslReadCallback is supposed to do:
 
 
 
connection: A connection reference. 
 
 
data: On return, your callback should overwrite the memory at this location with the data read from the connection. 
 
 
dataLength: On input, a pointer to an integer representing the length of the data in bytes. On return, your callback should overwrite that integer with the number of bytes actually transferred.
 
 
Excerpt from here

原文：https://stackoverflow.com/questions/37470378