Swift 将自己投射到不可女性化的指针<；无效>；导致EXC_指令错误

我正在开发一个Swift应用程序，在这个应用程序中，我使用来自特定设备的MIDI信号并使用它。例如：我想根据输入信号移动NSSlider的值。因此，我所做的是创建一个MIDI输入流（可以工作），现在我需要做的是获取该值并将其设置为

self.wave\u mode\u slider？.integerValue

我的输入连接方法如下：

func makeInputSource() {
    var midiClient : MIDIClientRef = 0
    var inPort : MIDIPortRef = 0
    var observer = UnsafeRawPointer(Unmanaged.passUnretained(self).toOpaque())

    MIDIClientCreate("WobClient" as CFString, nil, nil, &midiClient)
    MIDIInputPortCreate(midiClient, "WobClient_InPort" as CFString, {
        (pktList: UnsafePointer<MIDIPacketList>, readProcRefCon: UnsafeMutableRawPointer?, srcConnRefCon: UnsafeMutableRawPointer?) -> Void in
        let packetList : MIDIPacketList = pktList.pointee
        var packet : MIDIPacket = packetList.packet
        let mySelf = Unmanaged<Wob>.fromOpaque(readProcRefCon!).takeUnretainedValue()

        for _ in 1...packetList.numPackets {
            let bytes = Mirror(reflecting: packet.data).children
            var params : [UInt64] = []

            var i = packet.length
            for (_, attr) in bytes.enumerated() {
                let string = String(format: "%02X ", attr.value as! UInt8)
                params.append(UInt64(strtoul(string, nil, 16)))
                i -= 1

                if (i <= 0) {
                    break
                }
            }

            mySelf.wave_mode_slider?.integerValue = ("\(params[2])" as NSString).integerValue
            packet = MIDIPacketNext(&packet).pointee
        }

    }, nil, &inPort)

    MIDIPortConnectSource(inPort, self.source, &observer)
}

但是，这会导致在声明

imf

的行上出现

EXC\u BAD\u指令

我还尝试使用
保留的
变体，但这导致了相同的
EXC\u BAD\u指令

现在，我不是一个经验丰富的swift开发人员，尤其是在这方面，所以我可能错过了一些明显的东西，所以有人知道为什么会发生这种情况吗

谢谢

编辑----正如建议的那样，我稍微修改了代码

MIDIPortConnectSource(inPort, self.source, &observer)

变成

MIDIPortConnectSource(inPort, self.source, observer)

这也使得我在Swift 4（接收抄送）上将
observer
变量更改为
unsafemtablerawpointer
：

@objc func receiveMIDI（uu发送方：UIButton）{
let observer=unsafemeutablerawpointer（Unmanaged.passUnretained（self.toOpaque（））
midclientcreate（s、nil、nil和midclient）；
MIDIInputPortCreate（midiClient，p{
（pktList:UnsafePointer，
中的readProcRefCon:UnsafemeutableRawPointer？，srcConnRefCon:UnsafemeutableRawPointer？）
//回调块
let packetList:MIDIPacketList=pktList.pointee
var packet:MIDIPacket=packetList.packet
对于uu1…packetList.numPackets{
let bytes=Mirror（反射：packet.data）.children
var dumpStr=“”
var i=数据包长度
for（1;，attr），以字节为单位。枚举（）{
dumpStr+=字符串（格式：“%02d”，属性值为！UInt8）
i-=1
如果（我应该是
MIDIPortConnectSource（inPort，self.source，observer）
，没有
&
——正如我在：）上所建议的那样@MartinR Haha遗漏了这一点！我会更新代码，因为这个问题留给我，当然，如果你传递
observer
的内容或该变量的地址，这会有所不同。@MartinR Edited，：）更改后问题仍然存在？是否
print（observer）
和
print（readProcRefCon！）
显示相同的地址？
MIDIPortConnectSource(inPort, self.source, observer)

@objc func receiveMIDI(_ sender: UIButton) {

    let observer = UnsafeMutableRawPointer(Unmanaged.passUnretained(self).toOpaque())
    MIDIClientCreate(s, nil, nil, &midiClient);
    MIDIInputPortCreate(midiClient, p, {
    (pktList: UnsafePointer<MIDIPacketList>,
        readProcRefCon: UnsafeMutableRawPointer?, srcConnRefCon: UnsafeMutableRawPointer?) in
            // callback block
            let packetList:MIDIPacketList = pktList.pointee
            var packet:MIDIPacket = packetList.packet

            for _ in 1...packetList.numPackets{
                let bytes = Mirror(reflecting: packet.data).children
                var dumpStr = ""


                var i = packet.length
                for (_, attr) in bytes.enumerated(){
                        dumpStr += String(format:"%02d ", attr.value as! UInt8)
                        i -= 1
                        if (i <= 0)
                        {
                            break
                        }
                }
                let midi = dumpStr.split(separator: " ", maxSplits: 2, omittingEmptySubsequences: true)
                var midiIntValues = [Int(midi[0]),Int(midi[1]),Int(midi[2].trimmingCharacters(in: .whitespaces))]
                if let src = srcConnRefCon{
                    let mySelf = Unmanaged<DetailViewController>.fromOpaque(src).takeUnretainedValue()
                    if let v = midiIntValues[2]{
                       // print("control \(midiIntValues[1]) has \(v) value")
                    }

                }
                packet = MIDIPacketNext(&packet).pointee
            }
            // end callback block
        }, nil, &inputPort);

    let sourceCount = MIDIGetNumberOfSources()
    print("source count \(sourceCount)")

    for srcIndex in 0 ..< sourceCount {
        var source = MIDIGetSource(srcIndex)
        let status = MIDIPortConnectSource(inputPort,source,observer)
        if status == noErr {
            print("Connected to inputPort")
        } else {
            print("There was an error connecting the ports!")
        }
    }
}