枚举录音设备( 使用 winmm dll/C# )

介绍

本文介绍了一个示例类，该示例类通过P/Invoke在c＃中使用winmm.dll枚举录音设备。

使用代码

首先包含使用的所有名称空间：

using System.Runtime.InteropServices;//DLLimportusing System.Collections;//arrayList

第二步是声明我们需要的所有API：

//return total Sound Recording Devices[DllImport("winmm.dll")]publicstaticexternint waveInGetNumDevs();//return spesific Sound Recording Devices spec[DllImport("winmm.dll", EntryPoint = "waveInGetDevCaps")]publicstaticexternint waveInGetDevCapsA(int uDeviceID, ref WaveInCaps lpCaps, int uSize);

第三步是声明"WaveInCaps"结构由waveInGetDevCaps API返回，

[StructLayout(LayoutKind.Sequential, Pack = 4)]publicstruct WaveInCaps
{
 publicshort wMid;
 publicshort wPid;
 publicint vDriverVersion;
 [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
 public char[] szPname;
 publicuint dwFormats;
 publicshort wChannels;
 publicshort wReserved1;
}

我在clsRecDevices类中实现了这个：

using System;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;using System.Collections;namespace winApp
{class clsRecDevices
{ 
 [StructLayout(LayoutKind.Sequential, Pack = 4)]
 publicstruct WaveInCaps
 {
 publicshort wMid;
 publicshort wPid;
 publicint vDriverVersion;
 [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
 public char[] szPname;
 publicuint dwFormats;
 publicshort wChannels;
 publicshort wReserved1;
 } 
 [DllImport("winmm.dll")]
 publicstaticexternint waveInGetNumDevs();
 [DllImport("winmm.dll", EntryPoint = "waveInGetDevCaps")]
 publicstaticexternint waveInGetDevCapsA(int uDeviceID, 
 ref WaveInCaps lpCaps, int uSize);
 ArrayList arrLst = new ArrayList();
 //using to store all sound recording devices stringspublicint Count
 //to return total sound recording devices found { 
 get {return arrLst.Count;}
 }
 publicstring this[int indexer]
 //return spesipic sound recording device name {
 get{return (string)arrLst[indexer];}
 }
 public clsRecDevices() //fill sound recording devices array {
 int waveInDevicesCount = waveInGetNumDevs(); //get totalif (waveInDevicesCount >0)
 {
 for (int uDeviceID = 0; uDeviceID < waveInDevicesCount; uDeviceID++)
 {
 WaveInCaps waveInCaps = new WaveInCaps();
 waveInGetDevCapsA(uDeviceID,ref waveInCaps, 
 Marshal.SizeOf(typeof(WaveInCaps))); 
 arrLst.Add(newstring(waveInCaps.szPname).Remove(
 newstring(waveInCaps.szPname).IndexOf('')).Trim());
 //clean garbage }
 }
 } 
}
}

此类可按如下方式使用：

clsRecDevices recDev = new clsRecDevices();for (int i = 0; i < recDev.Count; i++){
 MessageBox.Show(recDev[i]);
}