CFStreamCreateBoundPair 无法释放

Question

我使用CFStreamCreateBoundPair创建一对流来上传一个大文件。代码如下。

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() {

}

除了内存问题，一切都很顺利。我检查了 Instruments 并发现 CFStreamCreateBoundPair 无法释放缓冲区大小的内存，在这种情况下，CFReadStream 和 CFWriteStream 都关闭后为 1M。我也有截图。

我对swift中的Core Foundation框架不太熟悉，不知道为什么不能自动发布。

Answer 1

这是我的做法：

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()
    }
}