C#光盘刻录

一.背景介绍

最近公司一个老项目需要添加导出数据到光盘的功能.开始对这功能添加有点抵触的.光盘?都啥年代了.

光盘一种即将淘汰的存储媒介.就像当年的随身听,Mp3,Mp4一样,即将退出历史舞台.领导让加,发牢骚归发牢骚,活还是得干哈.

从网上找了一些资料,都是特别古老的文档了.很多方法用起来并不是特别的方便.

1.CodePlex Archive https://archive.codeplex.com/?p=csimapi2samples 其中的例子功能不全,参数都使用dynamic类型,刚开始不了解那些基础概念时,理解起来比较难.可以参考学习.

2.博客:https://blog.csdn.net/huanghunjiuba/article/details/12967463 中的例子BurnCdDemo.

里面的BurnCdDemo对ImApi2做了封装.其实例子里面的封装做的挺不错的.注释也特别全.

在做测试的时候发现刻录功能在本机运行的非常好.在公司的测试机上却获取不到光盘大小,取到的大小是负数.对着Demo的源代码检查了半天,没找到原因.╮(￣▽￣")╭,脑袋好大的.后来找到原因了,在下面的过程中会描述下.

PS:个人不喜欢啥都做抽象.抽象,意味着要多写代码,查找问题也不方便.抽象,依赖注入,控制反转是个好东西,就是要多写许多代码.

个人觉得,很多技术还是要看实际项目情况而使用,没有必要去为了追求使用而滥用.看起来高大上,实际多写了代码维护也不方便.

So,自己搞个简单点的.因为就那么几个功能:获取光驱设备列表,获取光盘信息,添加媒体文件,刻录,进度通知.

二.工欲善其事必先利其器

因工作电脑没有光驱,测试非常不方便.那我们就安装一个虚拟光驱.

推荐一个比较好用的虚拟光驱软件PhantomBurner,带注册码.下载地址:https://download.csdn.net/download/zjhaag/10909339

安装过程就不说了.选下安装路径,一路Next.安装完成后提示重启.其实不重启也可以用.

安装完成后界面如下.在About中输入注册码激活.点击Create,选择Dvd+RW创建Virtual Disc Image.在资源管理器中就可以看到我们创建的虚拟光驱了.

 三.开工

1.设备列表获取

(1)首先添加一个RecorderHelper.在RecorderHelper类中添加一个静态方法GetRecorderList用于获取光驱设备列表.

         /// <summary>
         /// 获取光驱设备列表
         /// </summary>
         /// <returns></returns>
         public static List<Recorder> GetRecorderList()
         {
             List<Recorder> recordList = new List<Recorder>();

             // Create a DiscMaster2 object to connect to optical drives.
             MsftDiscMaster2 discMaster = new MsftDiscMaster2();
             for (int i = ; i < discMaster.Count; i++)
             {
                 if (discMaster[i] != null)
                 {
                     Recorder recorder = new Recorder(discMaster[i]);
                     recordList.Add(recorder);
                 }
             }
             return recordList;
         }

此时,需要Recorder光驱对象主要属性如下

         MsftDiscRecorder2 msRecorder = null;    //Recorder

         /// <summary>
         /// 当前磁盘标签
         /// </summary>
         public string RecorderName { get; private set; }    

         /// <summary>
         /// 是否支持当前刻录机
         /// </summary>
         public bool IsRecorderSupported { get; private set; }

         /// <summary>
         /// 是否支持当前磁盘媒体
         /// </summary>
         public bool IsCurrentMediaSupported { get; private set; }

         /// <summary>
         /// 当前磁盘可用大小
         /// </summary>
         public long FreeDiskSize { get; private set; }

         /// <summary>
         /// 当前磁盘总大小
         /// </summary>
         public long TotalDiskSize { get; private set; }

         /// <summary>
         /// 当前媒体状态
         /// </summary>
         public IMAPI_FORMAT2_DATA_MEDIA_STATE CurMediaState { get; private set; }

         /// <summary>
         /// 当前媒体状态
         /// </summary>
         public string CurMediaStateName { get; private set; }

         /// <summary>
         /// 当前媒体类型
         /// </summary>
         public IMAPI_MEDIA_PHYSICAL_TYPE CurMediaType { get; private set; }

         /// <summary>
         /// 当前媒体类型
         /// </summary>
         public string CurMediaTypeName { get; private set; }

         /// <summary>
         /// 是否可以刻录
         /// </summary>
         public bool CanBurn {get;private set;}

(2)对Recorder各属性进行初始化,赋值.主要方法如下

         /// <summary>
         /// Recorder Ctor
         /// </summary>
         /// <param name="uniqueId">标识Id</param>
         public Recorder(string uniqueId)
         {
             this.uniqueId = uniqueId;
             msRecorder = new MsftDiscRecorder2();
             msRecorder.InitializeDiscRecorder(uniqueId);
             InitRecorder();

             this.BurnMediaList = new List<BurnMedia>();
             this.BurnMediaFileSize = ;
         }

         /// <summary>
         /// 初始化Recorder
         /// 更新Recorder信息,更新光盘后可重试.
         /// </summary>
         public void InitRecorder()
         {
             try
             {
                 if (msRecorder.VolumePathNames != null && msRecorder.VolumePathNames.Length > )
                 {
                     foreach (object mountPoint in msRecorder.VolumePathNames)
                     {   //挂载点 取其中一个
                         RecorderName = mountPoint.ToString();
                         break;
                     }
                 }
                 // Define the new disc format and set the recorder
                 MsftDiscFormat2Data dataWriter = new MsftDiscFormat2Data();
                 dataWriter.Recorder = msRecorder;

                 if (!dataWriter.IsRecorderSupported(msRecorder))
                 {
                     return;
                 }
                 if (!dataWriter.IsCurrentMediaSupported(msRecorder))
                 {
                     return;
                 }
                 if (dataWriter.FreeSectorsOnMedia >= )
                 {   //可用大小
                     FreeDiskSize = dataWriter.FreeSectorsOnMedia * 2048L;
                 }

                 if (dataWriter.TotalSectorsOnMedia >= )
                 {   //总大小
                     TotalDiskSize = dataWriter.TotalSectorsOnMedia * 2048L;
                 }
                 CurMediaState = dataWriter.CurrentMediaStatus;  //媒体状态
                 CurMediaStateName = RecorderHelper.GetMediaStateName(CurMediaState);
                 CurMediaType = dataWriter.CurrentPhysicalMediaType; //媒介类型
                 CurMediaTypeName = RecorderHelper.GetMediaTypeName(CurMediaType);
                 CanBurn = RecorderHelper.GetMediaBurnAble(CurMediaState);   //判断是否可刻录
             }
             catch (COMException ex)
             {
                 string errMsg = ex.Message.Replace("\r\n", ""); //去掉异常信息里的\r\n
                 this.CurMediaStateName = $"COM Exception:{errMsg}";
             }
             catch (Exception ex)
             {
                 this.CurMediaStateName = $"{ex.Message}";
             }
         }

(3)测试代码如下

                     #region 查找光驱设备
                     Console.Clear();
                     Console.WriteLine("正在查找光驱设备..");
                     List<Recorder> recorderList = RecorderHelper.GetRecorderList();
                     if (recorderList.Count <= )
                     {
                         Console.WriteLine("没有可以使用的光驱,请检查.");
                         Console.WriteLine("请连接光驱后,按任意键重试...");
                         Console.ReadKey();
                         continue;
                     }
                     for (int i = ; i < recorderList.Count; i++)
                     {
                         Recorder tempRecorder = recorderList[i];
                         Console.WriteLine($"发现光驱设备:[{i+1}]  {tempRecorder.RecorderName}");
                         Console.WriteLine($"媒体类型:{tempRecorder.CurMediaTypeName}");
                         Console.WriteLine($"媒体状态:{tempRecorder.CurMediaStateName}");
                         Console.WriteLine("支持刻录:" + (tempRecorder.CanBurn ? "√" : "×"));
                         Console.WriteLine($"可用大小:{FormatFileSize(tempRecorder.FreeDiskSize)}");
                         Console.WriteLine($"总大小:{FormatFileSize(tempRecorder.TotalDiskSize)}");
                     }
                     if (!recorderList.Any(r=>r.CanBurn))
                     {
                         Console.WriteLine("没有可以用于刻录的光驱设备,请检查后,按任意键重试.");
                         Console.ReadKey();
                         continue;
                     }
                     #endregion        

测试结果:

至此,我们完成了对于光驱设备列表的获取及Recorder对象各属性的初始化工作.

说明下,对光驱设备操作需要有管理员权限,没有管理员权限会导致获取失败.对于C#应用程序设置以管理员身份启动请参照https://www.cnblogs.com/babycool/p/3569183.html

2.添加刻录文件

(1)我们为Recorder对象添加待刻录媒体对象列表和待刻录媒体文件大小两个属性

         /// <summary>
         /// 待刻录媒体对象List
         /// </summary>
         public List<BurnMedia> BurnMediaList {get;set;}

         /// <summary>
         /// 待刻录媒体文件大小
         /// </summary>
         public long BurnMediaFileSize { get; set; }

待刻录媒体对象定义如下

     /// <summary>
     /// 刻录媒体
     /// </summary>
     public class BurnMedia
     {
         /// <summary>
         /// 路径
         /// </summary>
         public string MediaPath { get; set; }

         /// <summary>
         /// 名称
         /// </summary>
         public string MediaName { get; set; }

         /// <summary>
         /// 是否是文件夹
         /// </summary>
         public bool IsDirectory { get; set; }

         /// <summary>
         /// 大小
         /// </summary>
         public long Size { get; set; }
     }

(2)为Recorder对象添加AddBurnMedia方法

         /// <summary>
         /// 添加刻录媒体对象
         /// </summary>
         public BurnMedia AddBurnMedia(string path)
         {
             BurnMedia media = null;
             if(string.IsNullOrEmpty(path))
             {
                 throw new Exception("文件路径不能为空.");
             }
             if(!CanBurn)
             {
                 throw new Exception("当前磁盘状态不支持刻录.");
             }
             media = new BurnMedia();
             long fileSize = ;
             if (Directory.Exists(path))
             {
                 DirectoryInfo dirInfo = new DirectoryInfo(path);
                 fileSize = GetDirectorySize(path);
                 media.MediaName = dirInfo.Name;
                 media.MediaPath = dirInfo.FullName;
                 media.Size = fileSize;
                 media.IsDirectory = true;
             }
             else if (File.Exists(path))
             {
                 FileInfo fileInfo = new FileInfo(path);
                 fileSize = fileInfo.Length;
                 media.MediaName = fileInfo.Name;
                 media.MediaPath = fileInfo.FullName;
                 media.Size = fileSize;
                 media.IsDirectory = false;
             }
             else
             {
                 throw new Exception("文件不存在");
             }
             if (BurnMediaFileSize + fileSize >= FreeDiskSize)
             {
                 throw new Exception("剩余空间不足");
             }
             if (BurnMediaList.Any(m => m.MediaName.ToLower() == media.MediaName.ToLower()))
             {
                 throw new Exception($"已存在媒体名称为{media.MediaName}的对象");
             }
             BurnMediaList.Add(media);
             BurnMediaFileSize += fileSize;
             return media;
         }

(3)测试代码如下

                     while (true)
                     {
                         Console.WriteLine("添加文件:请输入待刻录文件或文件夹路径. 0完成 1查看已添加文件");
                         string filePath = Console.ReadLine();
                         if (string.IsNullOrEmpty(filePath))
                         {
                             continue;
                         }
                         else if (filePath == "")
                         {
                             break;
                         }
                         else if (filePath == "")
                         {
                             ShowBurnMediaListInfo(recorder);
                         }
                         else
                         {
                             try
                             {
                                 BurnMedia media = recorder.AddBurnMedia(filePath);
                                 Console.WriteLine($"添加成功:{filePath}");
                                 Console.WriteLine("文件大小:" + FormatFileSize(media.Size));
                                 Console.WriteLine("已添加文件总大小:" + FormatFileSize(recorder.BurnMediaFileSize));
                             }
                             catch (Exception ex)
                             {
                                 Console.WriteLine($"添加失败:{ex.Message}");
                             }
                         }
                     }

运行结果:

3.刻录及刻录进度通知

为Recorder对象添加Burn方法.同时,添加刻录进度通知.

(1)添加BurnProgressChanged委托用于通知刻录进度

     /// <summary>
     /// 刻录进度delegate
     /// </summary>
     public delegate void BurnProgressChanged(BurnProgress burnProgress);

刻录进度通知对象定义如下(其属性为根据需求添加):

     /// <summary>
     /// 刻录进度对象
     /// </summary>
     public class BurnProgress
     {
         /// <summary>
         /// 当前操作
         /// 对应IMAPI2.IMAPI_FORMAT2_DATA_WRITE_ACTION枚举
         /// 4 正在写入数据 5完成数据写入 6 刻录完成
         /// </summary>
         public int CurrentAction { get; set; }

         /// <summary>
         /// 当前操作Name
         /// </summary>
         public string CurrentActionName { get; set; }

         /// <summary>
         /// 已用时间单位S
         /// </summary>
         public int ElapsedTime { get; set; }

         /// <summary>
         /// 预计总时间单位S
         /// </summary>
         public int TotalTime { get; set; }

         /// <summary>
         /// 数据写入进度
         /// </summary>
         public decimal Percent { get; set; }

         /// <summary>
         /// 数据写入进度%
         /// </summary>
         public string PercentStr { get { return Percent.ToString("0.00%"); } }
     }

(2)为Recorder对象添加委托属性

         /// <summary>
         /// 刻录进度变化通知
         /// </summary>
         public BurnProgressChanged OnBurnProgressChanged { get; set; }

(3)为Recorder添加Burn方法

         /// <summary>
         /// 刻录
         /// </summary>
         public void Burn(string diskName = "SinoUnion")
         {
             if(!CanBurn)
             {
                 throw new Exception("当前磁盘状态不支持刻录");
             }
             if (string.IsNullOrEmpty(diskName))
             {
                 throw new Exception("DiskName不能为空");
             }
             if (BurnMediaList.Count <= )
             {
                 throw new Exception("待刻录文件列表不能为空");
             }
             if(BurnMediaFileSize<=)
             {
                 throw new Exception("待刻录文件大小为0");
             }

             try
             {   //说明
                 //1.fsi.ChooseImageDefaults用的是IMAPI2FS的,我们定义的msRecorder是IMAPI2的.所以必须用动态类型
                 //2.dataWriter也要使用动态类型,要不然Update事件会出异常.
                 // Create an image stream for a specified directory.
                 dynamic fsi = new IMAPI2FS.MsftFileSystemImage();  // Disc file system
                 IMAPI2FS.IFsiDirectoryItem dir = fsi.Root;                 // Root directory of the disc file system
                 dynamic dataWriter = new MsftDiscFormat2Data(); //Create the new disc format and set the recorder

                 dataWriter.Recorder = msRecorder;
                 dataWriter.ClientName = "SinoGram";
                 //不知道这方法不用行不行.用的参数是IMAPI2FS的.
                 //所以学官网的例子,把fsi改成了动态的.使用msRecorder作为参数
                 fsi.ChooseImageDefaults(msRecorder);

                 //设置相关信息
                 fsi.VolumeName = diskName;   //刻录磁盘名称
                 for (int i = ; i < BurnMediaList.Count; i++)
                 {
                     dir.AddTree(BurnMediaList[i].MediaPath, true);
                 }
                 // Create an image from the file system
                 IStream stream = fsi.CreateResultImage().ImageStream;
                 try
                 {
                     dataWriter.Update += new DDiscFormat2DataEvents_UpdateEventHandler(BurnProgressChanged);
                     dataWriter.Write(stream);// Write stream to disc
                 }
                 catch (System.Exception ex)
                 {
                     throw ex;
                 }
                 finally
                 {
                     if (stream != null)
                     {
                         Marshal.FinalReleaseComObject(stream);
                     }
                 }
             }
             catch (Exception ex)
             {
                 Console.WriteLine($"刻录失败:{ex.Message}");
             }
         }

         /// <summary>
         /// 刻录进度通知
         /// </summary>
         /// <param name="object"></param>
         /// <param name="progress"></param>
         void BurnProgressChanged(dynamic @object, dynamic progress)
         {
             BurnProgress burnProgress = new BurnProgress();
             try
             {
                 burnProgress.ElapsedTime = progress.ElapsedTime;
                 burnProgress.TotalTime = progress.TotalTime;
                 burnProgress.CurrentAction = progress.CurrentAction;
                 if (burnProgress.ElapsedTime > burnProgress.TotalTime)
                 {   //如果已用时间已超过预估总时间.则将预估总时间设置为已用时间
                     burnProgress.TotalTime = burnProgress.ElapsedTime;
                 }
                 string strTimeStatus;
                 strTimeStatus = "Time: " + progress.ElapsedTime + " / " + progress.TotalTime;
                 int currentAction = progress.CurrentAction;
                 switch (currentAction)
                 {
                     case (int)IMAPI2.IMAPI_FORMAT2_DATA_WRITE_ACTION.IMAPI_FORMAT2_DATA_WRITE_ACTION_CALIBRATING_POWER:
                         burnProgress.CurrentActionName = "Calibrating Power (OPC)";
                         break;
                     case (int)IMAPI2.IMAPI_FORMAT2_DATA_WRITE_ACTION.IMAPI_FORMAT2_DATA_WRITE_ACTION_COMPLETED:
                         burnProgress.CurrentActionName = "Completed the burn";
                         burnProgress.Percent = ;
                         burnProgress.TotalTime = burnProgress.ElapsedTime;  //刻录完成,将预估用时,修正为已用时间
                         break;
                     case (int)IMAPI2.IMAPI_FORMAT2_DATA_WRITE_ACTION.IMAPI_FORMAT2_DATA_WRITE_ACTION_FINALIZATION:
                         burnProgress.CurrentActionName = "Finishing the writing";
                         burnProgress.Percent = ;
                         burnProgress.TotalTime = burnProgress.ElapsedTime;  //写入完成,将预估用时,修正为已用时间
                         break;
                     case (int)IMAPI2.IMAPI_FORMAT2_DATA_WRITE_ACTION.IMAPI_FORMAT2_DATA_WRITE_ACTION_FORMATTING_MEDIA:
                         burnProgress.CurrentActionName = "Formatting media";
                         break;
                     case (int)IMAPI2.IMAPI_FORMAT2_DATA_WRITE_ACTION.IMAPI_FORMAT2_DATA_WRITE_ACTION_INITIALIZING_HARDWARE:
                         burnProgress.CurrentActionName = "Initializing Hardware";
                         break;
                     case (int)IMAPI2.IMAPI_FORMAT2_DATA_WRITE_ACTION.IMAPI_FORMAT2_DATA_WRITE_ACTION_VALIDATING_MEDIA:
                         burnProgress.CurrentActionName = "Validating media";
                         break;
                     case (int)IMAPI2.IMAPI_FORMAT2_DATA_WRITE_ACTION.IMAPI_FORMAT2_DATA_WRITE_ACTION_VERIFYING:
                         burnProgress.CurrentActionName = "Verifying the data";
                         break;
                     case (int)IMAPI2.IMAPI_FORMAT2_DATA_WRITE_ACTION.IMAPI_FORMAT2_DATA_WRITE_ACTION_WRITING_DATA:
                         dynamic totalSectors;
                         dynamic writtenSectors;
                         dynamic startLba;
                         dynamic lastWrittenLba;
                         totalSectors = progress.SectorCount;
                         startLba = progress.StartLba;
                         lastWrittenLba = progress.LastWrittenLba;
                         writtenSectors = lastWrittenLba - startLba;
                         burnProgress.CurrentActionName = "Writing data";
                         burnProgress.Percent = Convert.ToDecimal(writtenSectors)/ Convert.ToDecimal(totalSectors);
                         break;
                     default:
                         burnProgress.CurrentActionName = "Unknown action";
                         break;
                 }
             }
             catch (Exception ex)
             {
                 burnProgress.CurrentActionName = ex.Message;
             }
             if (OnBurnProgressChanged != null)
             {
                 OnBurnProgressChanged(burnProgress);
             }
         }

(4)测试代码如下

                     if (recorder.BurnMediaList.Count <= )
                     {
                         Console.WriteLine($"未添加任何刻录文件.已退出刻录过程.");
                     }
                     else
                     {
                         #region 刻录前确认
                         bool confirmBurn = false;
                         Console.Clear();
                         ShowBurnMediaListInfo(recorder);
                         while (true)
                         {
                             Console.WriteLine();
                             Console.ForegroundColor = ConsoleColor.DarkGreen;//设置颜色.
                             Console.WriteLine($"刻录过程一旦开始,终止可能会造成磁盘损坏.确认要开始刻录(y/n)?");
                             Console.ForegroundColor = colorFore;//还原颜色.
                             string confirmStr = Console.ReadLine();
                             if (confirmStr.ToLower() == "n")
                             {
                                 break;
                             }
                             else if (confirmStr.ToLower() == "y")
                             {
                                 confirmBurn = true;
                                 break;
                             }
                         }
                         if (!confirmBurn)
                         {
                             Console.WriteLine($"本次刻录过程已退出");
                             continue;
                         }
                         #endregion
                         Console.CursorVisible = false;    //隐藏光标
                         ShowBurnProgressChanged(recorder);
                         recorder.Burn();    //刻录
                         Console.WriteLine();
                     }

(5)输出刻录进度变化,添加ShowBurnProgressChanged方法

在查找如何输出进度数据的时候,看到了控制台输出进度条的功能.带颜色的还挺漂亮的,看到好的功能就想加到我们的项目里.

         /// <summary>
         /// 输出刻录进度通知
         /// </summary>
         /// <param name="recorder"></param>
         static void ShowBurnProgressChanged(Recorder recorder)
         {
             Console.Clear();

             #region 搭建输出显示框架
             Console.WriteLine();
             Console.WriteLine($"**********************刻录中,请稍候**********************");
             Console.WriteLine();
             Console.WriteLine("  当前操作:"); //第4行当前操作
             Console.WriteLine();

             // 第6行绘制进度条背景
             Console.Write("  ");
             Console.BackgroundColor = ConsoleColor.DarkCyan;
             for (int i = ; i <= ; i++)
             {   //设置50*1的为总进度
                 Console.Write(" ");
             }

             Console.WriteLine();
             Console.BackgroundColor = colorBack;

             Console.WriteLine();    //第7行输出空行
             Console.WriteLine();    //第8行输出进度
             Console.WriteLine($"*********************************************************");  //第9行
             Console.WriteLine();    //第10行输出空行
             #endregion

             //进度变化通知时,更新相关行数据即可.
             recorder.OnBurnProgressChanged += (burnProgress) => {
                 if (burnProgress.CurrentAction == )
                 {   //刻录完成
                     Console.SetCursorPosition(, );
                     Console.WriteLine($"*************************刻录完成************************");
                 }
                 //第4行 当前操作
                 Console.SetCursorPosition(, );
                 Console.Write($"  当前操作:{burnProgress.CurrentActionName}");
                 Console.Write("                  ");    //填充空白区域
                 Console.ForegroundColor = colorFore;

                 // 第6行 绘制进度条进度(进度条前预留2空格)
                 Console.BackgroundColor = ConsoleColor.Yellow; // 设置进度条颜色
                 Console.SetCursorPosition(, ); // 设置光标位置,参数为第几列和第几行
                 for (int i = ; i <burnProgress.Percent*; i++)
                 {   //每个整数写入1个空格
                     Console.Write(" "); // 移动进度条
                 }
                 Console.BackgroundColor = colorBack; // 恢复输出颜色

                 //第8行 已用时间,总时间
                 Console.ForegroundColor = ConsoleColor.Green;// 更新进度百分比,原理同上.
                 Console.SetCursorPosition(, );
                 Console.Write($"  进度:{burnProgress.PercentStr}  " +
                     $"已用时间:{FormatTime(0, 0, burnProgress.ElapsedTime)}  " +
                     $"剩余时间:{FormatTime(0, 0, burnProgress.TotalTime - burnProgress.ElapsedTime)}");
                 Console.Write("      ");    //填充空白区域
                 Console.ForegroundColor = colorFore;

                 Console.SetCursorPosition(, );    //光标 定位到第10行
             };
         }

运行结果如下,剩余时间为IMAPI2提供.并不一定准确.

四.BurnCdDemo获取磁盘大小为负数bug

在开始的时候,我们说了使用BurnCdDemo获取光盘大小为负数.在实际开发的过程中,也碰到了.因为我们买的光盘太大了?达到8G,实际模拟刻录时,没那么大.所以没啥问题.

我们看BurnCdDemo里Recorder对象的代码:

 private long m_nDiskSize = ;
 private long m_nUseableSize = ;

 //可用的
 m_nUseableSize = msFormat.FreeSectorsOnMedia * ;
 //总大小
 m_nDiskSize = msFormat.TotalSectorsOnMedia * ;

msFormat.FreeSectorsOnMedia和msFormat.TotalSectorsOnMedia类型为int.大家想到原因了吧.int溢出了.所以把后面的2048改为2048L就可以了.看似正常的代码,以后在碰到类型转换时要多注意些.

五.总结

总结写点啥呢.当然是最重要的哈.上源码:https://github.com/279328316/RecorderHelper

如有问题,欢迎留言.