本文介绍了无法为类型 UnsafePointer<_> 调用初始化程序带有类型的参数列表 (UnsafeMutableRawPointer)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

当我从音频缓冲区数据以多点连接方式写入输出流时,出现错误

When I write the output stream in multipeer connectivity from audio buffer data I got the error

无法使用参数调用 UnsafePointer<_> 类型的初始化程序类型列表(UnsafeMutableRawPointer)

我找到了很多解决方案,但这个解决方案对我没有帮助.

I found the many solutions, but this solution not helpful for me.

我的代码是:

func send(_ buffer: AudioBuffer) {
        print(buffer.mData!)
        print(buffer.mDataByteSize)

        outputStreme?.write(UnsafePointer(buffer.mData), maxLength: buffer.mDataByteSize)
    }

提前致谢..:)

推荐答案

当某种规范更改影响到您的代码时,请查看官方参考.在您的情况下,AudioBuffer.mData 属于 UnsafeMutableRawPointer? 类型,您需要将其传递给 OutputStream.write(_:maxLength:) 类型为 UnsafePointer.

Please check the official reference when some sort of spec changes has affected with your code. In your case AudioBuffer.mData is of type UnsafeMutableRawPointer?, and you need to pass it to the first argument of OutputStream.write(_:maxLength:) of type UnsafePointer<UInt8>.

UnsafeMutableRawPointer

你可以找到这个返回UnsafeMutablePointer的方法:

You can find this method which returns UnsafeMutablePointer<T>:

func assumingMemoryBound(to: T.Type)

bound 的概念有点令人困惑,但您似乎可以将其用于指针类型转换:

The concept of bound is sort of confusing, but seems you can use it for pointer type conversion:

outputStreme?.write(buffer.mData!.assumingMemoryBound(to: UInt8.self), maxLength: Int(buffer.mDataByteSize))

(假设强制解包 ! 按照您的 print(buffer.mData!) 的建议足够安全.)

(Assuming forced-unwrapping ! is safe enough as suggested by your print(buffer.mData!).)

内存绑定-ness 没有很好地定义,并且目前没有影响.还有另一种类型转换方法 func bindMemory(to: T.类型,容量:Int),两者都可以正常工作(再次,就目前而言).

Memory bound-ness is not well defined for most APIs which return pointers, and has no effect as for now. There's another type conversion method func bindMemory<T>(to: T.Type, capacity: Int), and both work without problems (again, as for now).

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07-18 07:51
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