如何快速将指针数组写入txt文件

问题描述

要提取音频文件的样本值，我有以下代码：

let Data = Array(UnsafeMutableRawBufferPointer(start:buffer.mData,count: Int(buffer.mDataByteSize))

问题是：如何将这个指针数组保存到txt文件中？因此，如何将样本值提取到txt文件中。我对Swift没什么经验，我更喜欢C ++

解决方法

....您的缓冲区.....

canActivate(
    next: ActivatedRouteSnapshot,state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {    
    return this.service.isLoggedIn;
  }

这应该在您的downloadsDirectory中创建文件“ yourFile”

请让我知道。

,

您已经具有创建UnsafeMutableRawBufferPointer的代码。使用它来创建数据，并将其写入磁盘：

let buffer = UnsafeRawBufferPointer(start:buffer.mData,count: Int(buffer.mDataByteSize)
let data = Data.withUnsafeBytes(buffer)

let fileURL = //the path to which you want to save

data.write(to: fileURL,options: []

,

我通过避免使用指针数组的特殊情况解决了这个问题。如果其他人想将音频样本写入文本文件，这就是我通过 AVAudioFile 解决问题的方式：

if FileManager.default.fileExists(atPath: getFileURL().path)
        {
            do{
                //Load Audio into Buffer and then write it down to a .txt
                let file = try AVAudioFile(forReading: getFileURL())
                let format = AVAudioFormat(commonFormat: .pcmFormatFloat32,sampleRate: file.fileFormat.sampleRate,channels: file.fileFormat.channelCount,interleaved: false)
                
                guard let buf = AVAudioPCMBuffer(pcmFormat: format!,frameCapacity: AVAudioFrameCount(file.length)) else{
                    throw NSError()
                }
                try file.read(into: buf)
                guard buf.floatChannelData != nil else{print("Channel Buffer was not able to be created")
                    throw NSError()}
                
                let arraySize = Int(buf.frameLength)
                print(arraySize,"Samples saved")
                let samples = Array(UnsafeBufferPointer(start:buf.floatChannelData![0],count:arraySize))
                //Array is going to be encoded and safe
                let encoded = try! JSONEncoder().encode(samples)
                try encoded.write(to: outputURL())
                print("Textfile created.\n")
             }catch {print(error)}
            
            
        }else {print("AudioFile is missing")}