CFStreamCreateBoundPair不能免費

Question

我使用CFStreamCreateBoundPair來創建一對流來上傳一個大文件。代碼如下所示。

let readStreamPointer = UnsafeMutablePointer<Unmanaged<CFReadStream>?>.alloc(1) 
let writeStreamPointer = UnsafeMutablePointer<Unmanaged<CFWriteStream>?>.alloc(1) 
let bufferSize = 1024*1024 //1M buffer size 
CFStreamCreateBoundPair(kCFAllocatorDefault, readStreamPointer,writeStreamPointer, Int(bufferSize) as CFIndex) 
if let rStream = readStreamPointer.memory?.takeRetainedValue(),writeStream = writeStreamPointer.memory?.takeRetainedValue() { 

} 

一切順利的話，除了內存issue.I用儀器檢查並找出CFStreamCreateBoundPair無法釋放緩衝區大小的內存，在這種情況下是1M後，無論是CFReadStream和CFWriteStream是closed.I有屏幕截圖也是。

我對swift中的Core Foundation框架不太熟悉，不知道爲什麼它不能自動發佈。

Answer 1

這裏是我做的方式：

class func createBound(inputStream: inout InputStream?, outputStream: inout OutputStream?, bufferSize: UInt) { 
    var readStream: Unmanaged<CFReadStream>? 
    var writeStream: Unmanaged<CFWriteStream>? 
    CFStreamCreateBoundPair(nil, &readStream, &writeStream, CFIndex(bufferSize)) 
    if inputStream != nil { 
     inputStream = readStream!.takeUnretainedValue() 
    } 
    if outputStream != nil { 
     outputStream = writeStream!.takeUnretainedValue() 
    } 
}