以块的形式从文档目录中读取文件

我从文档目录中获取文件路径，并以 1024 块的形式读取该文件并保存（追加）到 NSMutableData 对象，或者你可以直接写入 socket。

// MARK: - Get file data as chunks Methode.
func getFileDataInChunks() {
    
    let doumentDirectoryPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString
    let filePath = doumentDirectoryPath.appendingPathComponent("video.mp4")
    
    
    //Check file exits at path or not.
    if FileManager.default.fileExists(atPath: filePath) {
        
        let chunkSize = 1024 // divide data into 1 kb
        
        //Create NSMutableData object to save read data.
        let ReadData = NSMutableData()
        
        do {
            
            //open file for reading.
            outputFileHandle = try FileHandle(forReadingFrom: URL(fileURLWithPath: filePath))
            
            // get the first chunk
            var datas = outputFileHandle?.readData(ofLength: chunkSize)
            
            //check next chunk is empty or not.
            while !(datas?.isEmpty)! {
                
                //here I write chunk data to ReadData or you can directly write to socket.
                ReadData.append(datas!)
                
                // get the next chunk
                datas = outputFileHandle?.readData(ofLength: chunkSize)
                
                print("Running: \(ReadData.length)")
            }
            
            //close outputFileHandle after reading data complete.
            outputFileHandle?.closeFile()
            
            print("File reading complete")
            
        }catch let error as NSError {
            print("Error : \(error.localizedDescription)")
        }
    }
}

文件读取完成后，你将获得 ReadData 变量中的文件数据这里 outputFileHandle 是 FileHandle 的一个对象

var outputFileHandle:FileHandle?