概述
- 标 题: WinCE系统播放wav声音文件的实现方法
- 发信站: 放鹤亭 BBS (Tue Apr 15 12:55:40 2008), 本站(bbs.cumt.edu.cn)
- 此示例在WinCE5.0 + .Net CF2.0环境下运行成功
- 此示例需要引用下面的命名空间:
- System
- System.IO
- System.Reflection
- System.Runtime.InteropServices
- System.Windows.Forms
- 此示例演示如何使用平台调用来播放两个WAV文件:一个为嵌入的资源,另一个为内容。
- 此示例定义了一个Sound类,该类通过WinCE的CoreDll.dll提供下面的本机代码功能:
- 1、使用文件名或流播放声音的平台调用方法声明。
- 2、用于在平台调用方法调用中传递参数的位值枚举。
- 3、Play方法,用于调用正确的平台调用方法来播放单独的文件或嵌入的资源。
- 第一步:将 Sound 类添加到项目中。
- public class Sound
- {
- private byte[] m_soundBytes;
- private string m_fileName;
- private enum Flags {
- SND_SYNC = 0x0000, /* play synchronously (default) */
- SND_ASYNC = 0x0001, /* play 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));
- }
- }
- 第二步:添加用于创建 Sound 类的实例和播放文件的方法,例如,在某按钮的 Click 事件中。
- private void btnEmbedded_Click(object sender, System.EventArgs e) {
- Sound sound = new Sound (Assembly.GetExecutingAssembly().GetManifestResourceStream("SoundSample.chimes.wav"));
- sound.Play();
- }
- private void btnFile_Click(object sender, System.EventArgs e) {
- Sound sound = new Sound (@"Program Files/SoundSample/dingdang.wav");
- sound.Play();
- }
- 编译代码
- OK
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