C#调用DLL处理声卡程序

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace HardWaresOperation
{
public class SpeakerBeeper
{
//#region 调用DLL文件判断机器是否有声卡
//[DllImport("winmm.dll",EntryPoint = "waveOutGetNumdevs")]

////waveOutGetNumdevs()方法
////当机器有声卡时返回1
////没有声卡返回0
//public static extern int waveOutGetNumdevs();
//#endregion

//文件资源
private string SoundSource = @"C:\Documents and Settings\Administrator\桌面\gc22002a.wav";

public SpeakerBeeper(string _SoundSource)
{
SoundSource = _SoundSource;
}

/// <summary>
/// 检查声卡，播放声音
/// </summary>
/// <param name="_SoundSource">声音文件</param>
/// <returns>播放成功，返回true</returns>
public bool SpeakerBeep()
{
if (SBHelper.waveOutGetNumDevs()!= 0)
{
SBHelper.PlaySound(SoundSource, IntPtr.Zero, SBHelper.PlaySoundFlags.SND_FILENAME | SBHelper.PlaySoundFlags.SND_ASYNC);
return true;
}
else
{
return false;
}
}
}
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace HardWaresOperation
{
class SBHelper
{
public enum PlaySoundFlags : int
{
SND_SYNC = 0x0000,//同步
SND_ASYNC = 0x0001,//异步
SND_NODEFAULT = 0x0002,//未找到文件默认为静音
SND_MEMORY = 0x0004,//声音文件来自内存
SND_LOOP = 0x0008, //循环播放
SND_NOSTOP = 0x0010,//不停止目前的播放
SND_NOWAIT = 0x00002000,//当播放器忙碌时不等待
SND_ALIAS = 0x00010000, //为已注册的别名时
SND_ALIAS_ID = 0x00110000, //别名为ID
SND_FILENAME = 0x00020000, //文件名
SND_RESOURCE = 0x00040004 //资源名
}

#region 调用DLL文件判断机器是否有声卡
[DllImport("winmm.dll", EntryPoint = "waveOutGetNumDevs")]

//waveOutGetNumdevs()方法
//当机器有声卡时返回1
//没有声卡返回0
public static extern int waveOutGetNumDevs();
#endregion

[DllImport("winmm.dll")]
//SoundSource声音文件
//参数hmod是应用程序的实例句柄
//psFlag播放模式
public static extern bool PlaySound(string SoundSource, IntPtr hmod,PlaySoundFlags psFlag);
}
}