淦!
首先代码是不完整的, 我还是没能成功设置音量, 除此之外, 别的倒是挺顺利的, 当前实现的功能如下:
播放 暂停 还原 停止 获取进度 获取长度 设置进度 获取播放状态
内容:
- 本项目的仓库在: SlimeNull/AudioTest, 在这里下载哦, 别忘了还原 nuget 包, 因为用了 NAudio 库.
> 音乐播放 Demo:
- 先放图吧:
![[C#] 音乐播放 3 种方式 Demo 与 MCI 音乐播放器封装类._c#](https://file.cfanz.cn/uploads/png/2023/04/10/6/8aJZdfKDKZ.png)
首先左上角是打开文件的, 然后 PlayType 是播放方式, 我现在让它支持 3 种, 一种是SoundPlayer, 然后是 MCI, 然后是 NAudio 库.
实现了播放, 暂停, 停止, 移除, 进度调整到开头, 进度调整(就那个track bar), 同步播放(如果点了这个, UI线程会阻塞的哦), 获取音乐长度, 获取播放状态, 获取播放位置, 重复播放.
不同的功能对不同的播放种类支持性不同, 所以, 如果你按下了按钮, 没反应, 也没报错, 那就是它不支持这个功能(也就是代码里没有写)’
- 下载代码, 请看前面的链接.↑跳转↑
> MCI 播放器封装:
- 上边的窗体程序就体现了封装类所实现的所有功能喔, 所以试试吧, 你也可以直接粘贴下面的代码, 但是cs文件的名称, 如果可以的话, 我希望你命名为 “Null.MciPlayer” (没错就是我的名字
using System;
using System.IO;
using System.Runtime.InteropServices;
namespace Null.MciPlayer
{
public class MciPlayer : IDisposable
{
[DllImport("kernel32.dll", EntryPoint = "GetShortPathNameW", CharSet = CharSet.Unicode)]
extern static short GetShortPath(string longPath, string buffer, int bufferSize);
[DllImport("winmm.dll", EntryPoint = "mciSendString", CharSet = CharSet.Unicode)]
extern static int MciSendString(string command, string buffer, int bufferSize, IntPtr callback);
bool TryGetShortPath(string longPath, out string shortPath)
{
shortPath = null;
short reqLen = GetShortPath(longPath, null, 0); // 指定 null与0, 则返回需要的长度
if (reqLen == 0)
return false;
shortPath = new string('\0', reqLen); // 声明缓冲
short rstLen = GetShortPath(longPath, shortPath, reqLen); // 转换
if (rstLen == 0 || rstLen == reqLen)
return false;
shortPath = shortPath.TrimEnd('\0');
return true;
}
private string longpath;
private string shortName;
private string aliasName;
public MciPlayer() { }
public MciPlayer(string path)
{
if (!File.Exists(path))
throw new FileNotFoundException("File not exist.", path);
longpath = path;
}
void MciSendStringWithCheck(string command, string buffer, int bufferSize, IntPtr callback)
{
int err = MciSendString(command, buffer, bufferSize, callback);
if (err != 0)
throw new MciException(err);
}
string StatusInfo(string info)
{
string buffer = new string('\0', 32);
MciSendStringWithCheck($"status {aliasName} {info}", buffer, 32, IntPtr.Zero);
return buffer.TrimEnd('\0');
}
public string DevicePath { get => longpath; }
public string DeviceShortPath { get => shortName; }
public string AliasName { get => aliasName; }
public bool SetDevicePath(string longpath)
{
if (aliasName != null)
return false;
this.longpath = longpath;
return true;
}
public void Open()
{
if (!TryGetShortPath(longpath, out shortName))
throw new Exception("Get short path faield when initializing.");
aliasName = $"nmci{DateTime.Now.Ticks}";
MciSendStringWithCheck($"open {shortName} alias {aliasName}", null, 0, IntPtr.Zero);
}
public void Close()
{
MciSendStringWithCheck($"close {aliasName}", null, 0, IntPtr.Zero);
aliasName = null;
}
public void Play()
{
MciSendStringWithCheck($"play {aliasName}", null, 0, IntPtr.Zero);
}
public void Resume()
{
MciSendStringWithCheck($"resume {aliasName}", null, 0, IntPtr.Zero);
}
public void Pause()
{
MciSendStringWithCheck($"pause {aliasName}", null, 0, IntPtr.Zero);
}
public void Stop()
{
MciSendStringWithCheck($"stop {aliasName}", null, 0, IntPtr.Zero);
}
public int GetPosition()
{
return int.Parse(StatusInfo("position"));
}
public int GetLength()
{
return int.Parse(StatusInfo("length"));
}
public PlaybackState GetState()
{
switch (StatusInfo("mode").ToLower())
{
case "playing":
return PlaybackState.Playing;
case "paused":
return PlaybackState.Paused;
case "stopped":
return PlaybackState.Stopped;
default:
return PlaybackState.Invalid;
}
}
public void PlayWait()
{
MciSendStringWithCheck($"play {aliasName} wait", null, 0, IntPtr.Zero);
}
public void PlayRepeat()
{
MciSendStringWithCheck($"play {aliasName} repeat", null, 0, IntPtr.Zero);
}
public void Seek(int position)
{
MciSendStringWithCheck($"seek {aliasName} to {position}", null, 0, IntPtr.Zero);
}
public void SeekToStart()
{
MciSendStringWithCheck($"seek {aliasName} to start", null, 0, IntPtr.Zero);
}
public void SetSeekMode(bool fExact)
{
MciSendStringWithCheck($"set {aliasName} seek exactly {(fExact ? "on" : "off")}", null, 0, IntPtr.Zero);
}
public void Dispose()
{
if (aliasName != null)
Close();
}
}
public enum PlaybackState
{
Stopped,
Playing,
Paused,
Invalid = -1,
}
public class MciException : Exception
{
private MciError err;
public int ErrorId { get => (int)err; }
public string ErrorName { get => err.ToString(); }
public override string Message { get => ErrorName; }
public MciException() { }
public MciException(int errorId)
{
if (Enum.IsDefined(typeof(MciError), errorId))
err = (MciError)errorId;
else
throw new ArgumentOutOfRangeException("不是正确的错误ID");
}
public MciException(string errorName)
{
if (!Enum.TryParse<MciError>(errorName, out err))
throw new ArgumentOutOfRangeException("不是正确的错误ID");
}
enum MciError
{
MCIERR_NO_ERROR = 0,
MCIERR_INVALID_DEVICE_ID = 257,
MCIERR_UNRECOGNIZED_KEYWORD = 259,
MCIERR_UNRECOGNIZED_COMMAND = 261,
MCIERR_HARDWARE = 262,
MCIERR_INVALID_DEVICE_NAME = 263,
MCIERR_OUT_OF_MEMORY = 264,
MCIERR_DEVICE_OPEN = 265,
MCIERR_CANNOT_LOAD_DRIVER = 266,
MCIERR_MISSING_COMMAND_STRING = 267,
MCIERR_PARAM_OVERFLOW = 268,
MCIERR_MISSING_STRING_ARGUMENT = 269,
MCIERR_BAD_INTEGER = 270,
MCIERR_PARSER_INTERNAL = 271,
MCIERR_DRIVER_INTERNAL = 272,
MCIERR_MISSING_PARAMETER = 273,
MCIERR_UNSUPPORTED_FUNCTION = 274,
MCIERR_FILE_NOT_FOUND = 275,
MCIERR_DEVICE_NOT_READY = 276,
MCIERR_INTERNAL = 277,
MCIERR_DRIVER = 278,
MCIERR_CANNOT_USE_ALL = 279,
MCIERR_MULTIPLE = 280,
MCIERR_EXTENSION_NOT_FOUND = 281,
MCIERR_OUTOFRANGE = 282,
MCIERR_FLAGS_NOT_COMPATIBLE = 284,
MCIERR_FILE_NOT_SAVED = 286,
MCIERR_DEVICE_TYPE_REQUIRED = 287,
MCIERR_DEVICE_LOCKED = 288,
MCIERR_DUPLICATE_ALIAS = 289,
MCIERR_BAD_CONSTANT = 290,
MCIERR_MUST_USE_SHAREABLE = 291,
MCIERR_MISSING_DEVICE_NAME = 292,
MCIERR_BAD_TIME_FORMAT = 293,
MCIERR_NO_CLOSING_QUOTE = 294,
MCIERR_DUPLICATE_FLAGS = 295,
MCIERR_INVALID_FILE = 296,
MCIERR_NULL_PARAMETER_BLOCK = 297,
MCIERR_UNNAMED_RESOURCE = 298,
MCIERR_NEW_REQUIRES_ALIAS = 299,
MCIERR_NOTIFY_ON_AUTO_OPEN = 300,
MCIERR_NO_ELEMENT_ALLOWED = 301,
MCIERR_NONAPPLICABLE_FUNCTION = 302,
MCIERR_ILLEGAL_FOR_AUTO_OPEN = 303,
MCIERR_FILENAME_REQUIRED = 304,
MCIERR_EXTRA_CHARACTERS = 305,
MCIERR_DEVICE_NOT_INSTALLED = 306,
MCIERR_GET_CD = 307,
MCIERR_SET_CD = 308,
MCIERR_SET_DRIVE = 309,
MCIERR_DEVICE_LENGTH = 310,
MCIERR_DEVICE_ORD_LENGTH = 311,
MCIERR_NO_INTEGER = 312,
MCIERR_WAVE_OUTPUTSINUSE = 320,
MCIERR_WAVE_SETOUTPUTINUSE = 321,
MCIERR_WAVE_INPUTSINUSE = 322,
MCIERR_WAVE_SETINPUTINUSE = 323,
MCIERR_WAVE_OUTPUTUNSPECIFIED = 324,
MCIERR_WAVE_INPUTUNSPECIFIED = 325,
MCIERR_WAVE_OUTPUTSUNSUITABLE = 326,
MCIERR_WAVE_SETOUTPUTUNSUITABLE = 327,
MCIERR_WAVE_INPUTSUNSUITABLE = 328,
MCIERR_WAVE_SETINPUTUNSUITABLE = 329,
MCIERR_SEQ_DIV_INCOMPATIBLE = 336,
MCIERR_SEQ_PORT_INUSE = 337,
MCIERR_SEQ_PORT_NONEXISTENT = 338,
MCIERR_SEQ_PORT_MAPNODEVICE = 339,
MCIERR_SEQ_PORT_MISCERROR = 340,
MCIERR_SEQ_TIMER = 341,
MCIERR_SEQ_PORTUNSPECIFIED = 342,
MCIERR_SEQ_NOMIDIPRESENT = 343,
MCIERR_NO_WINDOW = 346,
MCIERR_CREATEWINDOW = 347,
MCIERR_FILE_READ = 348,
MCIERR_FILE_WRITE = 349,
MCIERR_NO_IDENTITY = 350,
}
}
}
如果有什么建议或者这个类有可改进的地方, 欢迎留言哦~ n(*≧▽≦*)n
