C# WinCE下播放*.wav,*.mp3 详解（适用WinCE6.0和以前的所有版本）
前天买了块wince的控制板，询问厂家如何用C#在wince下如何播放声音，令人郁闷的是，几天过去了也没问出个结果。只好自己找资料，
现在贡献出来，希望能帮助其他的朋友少走弯路。
我介绍的方法适用WinCE6.0和以前的所有版本。
1.首先介绍如何播放*.wav, 这个方式微软提供了标准的播放类，但不适合播放大文件的*.wav, 只适合10MB以内的简单系统提示语音。
如下：
using System;
using System.Runtime.InteropServices;
using System.IO;
namespace Dengfengsoft
{
public class Sound
{
private byte[] m_soundBytes;
private string m_fileName;
//
private enum Flags
{
SND_SYNC = 0x0000, /* play synchronously (default) */
SND_ASYNC = 0x0001, /* plaSmartHomey asynchronously */
SND_NODEFAULT = 0x0002, /* silence (!default) if sound not found */
SND_MEMORY = 0x0004, /* pszSound points to a memory file */
SND_LOOP = 0x0008, /* loop the sound until next sndPlaySound */
SND_NOSTOP = 0x0010, /* don't stop any currently playing sound */
SND_NOWAIT = 0x00002000, /* don't wait if the driver is busy */
SND_ALIAS = 0x00010000, /* name is a registry alias */
SND_ALIAS_ID = 0x00110000, /* alias is a predefined ID */
SND_FILENAME = 0x00020000, /* name is file name */
SND_RESOURCE = 0x00040004 /* name is resource name or atom */
}
[DllImport("CoreDll.DLL", EntryPoint = "PlaySound", SetLastError = true)]
private extern static int WCE_PlaySound(string szSound, IntPtr hMod, int flags);
[DllImport("CoreDll.DLL", EntryPoint = "PlaySound", SetLastError = true)]
private extern static int WCE_PlaySoundBytes(byte[] szSound, IntPtr hMod, int flags);
/// <summary>
/// Construct the Sound object to play sound data from the specified file.
/// </summary>
public Sound(string fileName)
{
m_fileName = fileName;
}
/// <summary>
/// Construct the Sound object to play sound data from the specified stream.
/// </summary>
public Sound(Stream stream)
{
// read the data from the stream
m_soundBytes = new byte[stream.Length];
stream.Read(m_soundBytes, 0, (int)stream.Length);
}
/// <summary>
/// Play the sound
/// </summary>
public void Play()
{
// if a file name has been registered, call WCE_PlaySound,
// otherwise call WCE_PlaySoundBytes
if (m_fileName != null)
WCE_PlaySound(m_fileName, IntPtr.Zero, (int)(Flags.SND_ASYNC | Flags.SND_FILENAME));
else
WCE_PlaySoundBytes(m_soundBytes, IntPtr.Zero, (int)(Flags.SND_ASYNC | Flags.SND_MEMORY));
}
}
}调用方法如下：
private void button1_Click(object sender, EventArgs e)
{
Sound soundFile = new Sound("\\Program Files\\music.wav");
soundFile.Play();
}
2. 播放MP3文件
这个就比较难了，找了很久才找到的方法。
国外的前辈几年前给我们做了一个控件：fmodce.dll， 现在不是免费版了，但本文附件是早期的版本，所以...你懂的。
运行在winCE6.0,和以前的版本都没有问题！
MP3的播放类如下：
using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace Dengfengsoft
{
public class PlayMP3
{
public static IntPtr GetStream(string filename) // 获得音频文件的IntPtr
{
byte[] filenamebytes = System.Text.Encoding.Default.GetBytes(filename + null);
GCHandle hfile = GCHandle.Alloc(filenamebytes, GCHandleType.Pinned);
if (Environment.Version.Major == 1) return new IntPtr(hfile.AddrOfPinnedObject().ToInt32() + 4);
else return hfile.AddrOfPinnedObject();
}
[DllImport("fmodce.dll", EntryPoint = "FSOUND_Init", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
public static extern bool Init(int mixrate, int maxsoftwarechannels, int flags); // 初始化
[DllImport("fmodce.dll", EntryPoint = "FSOUND_Stream_GetLength", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
public static extern int GetLength(IntPtr fstream); // 获得流媒体的长度
[DllImport("fmodce.dll", EntryPoint = "FSOUND_Stream_GetPosition", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
public static extern UInt32 GetPosition(IntPtr fstream); // 获得流媒体当前播放位置
[DllImport("fmodce.dll", EntryPoint = "FSOUND_Stream_Open", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
public static extern IntPtr Open(IntPtr data, int mode, int offset, int length); // 打开音频文件
[DllImport("fmodce.dll", EntryPoint = "FSOUND_Stream_Play", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
public static extern int Play(int channel, IntPtr fstream); // 播放音频文件
[DllImport("fmodce.dll", EntryPoint = "FSOUND_Stream_SetPosition", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
public static extern bool SetPosition(IntPtr fstream, UInt32 position); // 定位音频文件播放位置
[DllImport("fmodce.dll", EntryPoint = "FSOUND_Stream_Stop", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
public static extern bool Stop(IntPtr fstream); // 停止播放
[DllImport("fmodce.dll", EntryPoint = "FSOUND_Close", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
public static extern void Close(); // 关闭音频文件
[DllImport("coredll.dll", SetLastError = true)]
public static extern int SetSystemPowerState(string psState, int StateFlags, int Options);
const int POWER_FORCE = 0x1000;
const int POWER_STATE_ON = 0x10000;
}
}
〉〉播放MP3
private void button2_Click(object sender, EventArgs e)
{
try
{
//调用
string currentSoundTrack = "\\Program Files\\music.mp3";
PlayMP3.Init(44100, 16, 0); // 初始化为44.1kHz
IntPtr soundStream = PlayMP3.GetStream(currentSoundTrack);
soundHandle = PlayMP3.Open(soundStream, 16 | 32 | 256, 0, 0);
PlayMP3.Play(0, soundHandle);
}
catch
{
MessageBox.Show("播放失败。");
}
}
〉〉停止播放
private void button3_Click(object sender, EventArgs e)
{
PlayMP3.Stop(soundHandle);
}注意 soundHandle是全局变量
〉〉退出MP3播放器
private void button4_Click(object sender, EventArgs e)
{
PlayMP3.Close();//一般放在窗体退出的时候
}
本文两个例子的完整代码下载（vs2008）