Question

我想通过WinAPI和C＃获取默认的音频设备ID。我希望保存此ID（将来也要保存此卷），以便将来在WinServer2012和Windows8中进行还原。我尝试避免任何包装或包含其他dll。当我用Google搜索时，可以使用以下WinAPI函数：

[DllImport("winmm.dll")]
static extern uint waveOutMessage(IntPtr deviceID, uint uMsg, ref uint dwParam1, ref uint dwParam2);

我找到了一个调用以下函数的示例：

[DllImport("winmm.dll")]
static extern uint waveOutMessage(IntPtr deviceID, uint uMsg, IntPtr dwParam1, IntPtr dwParam2);

或：

[DllImport("winmm.dll")]
static extern uint waveOutMessage(IntPtr deviceID, uint uMsg, ref uint dwParam1, ref uint dwParam2);

使用C＃方法：

string GetAudioOutput()
        {
            uint originalDeviceId = 0; //4
            uint newDeviceId = 0; //4
            uint DRVM_MAPPER_PREFERRED_GET = 0x2015;
            uint DRVM_MAPPER_PREFERRED_SET = 0x2016;
            int deviceId = 0; //-1

            IntPtr WAVE_MAPPER = new IntPtr(-1);
            uint ret = waveOutMessage(WAVE_MAPPER, DRVM_MAPPER_PREFERRED_GET, GCHandle.Alloc(originalDeviceId, GCHandleType.Pinned).AddrOfPinnedObject() , GCHandle.Alloc(newDeviceId, GCHandleType.Pinned).AddrOfPinnedObject() );
            //uint ret = waveOutMessage(WAVE_MAPPER, DRVM_MAPPER_PREFERRED_GET, ref originalDeviceId, ref newDeviceId);
            return deviceId.ToString() + originalDeviceId.ToString() + newDeviceId.ToString() + ret.ToString(); //I get 0000
        }

我希望输出默认的音频设备ID。但是对于每个变量，我得到0（已定义）。我在WinServer2012上使用此功能没有任何结果。我是否编写了错误的代码，或者就我而言这是不可能的？谢谢。

Answer 1

0是默认设备ID

但是，如果您在Windows中进行更改，则仍然会得到0，但是新设备在WAVEOUTCAPS中会得到不同的值

（您应该使用Windows所使用的更新的Core Audio API）

样本=>

uint nNumDevices = waveOutGetNumDevs();
if (nNumDevices >= 1)
{
    int nRet = MMSYSERR_NODRIVER;
    uint dwFlags = 0;
    uint uWaveID = 0;
    nRet = waveOutMessage((IntPtr)WAVE_MAPPER, DRVM_MAPPER_PREFERRED_GET, out uWaveID, out dwFlags);
    if (nRet == MMSYSERR_NOERROR)
    {
        WAVEOUTCAPS caps = new WAVEOUTCAPS();
        nRet = waveOutGetDevCaps((IntPtr)uWaveID, out caps, Marshal.SizeOf(typeof(WAVEOUTCAPS)));
    }
}

声明=>

    [DllImport("Winmm.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern uint waveOutGetNumDevs();

    [DllImport("Winmm.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern int waveOutGetDevCaps(IntPtr uDeviceID, out WAVEOUTCAPS pwoc, int cbwoc);

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct WAVEOUTCAPS
    {
        public ushort wMid;
        public ushort wPid;
        public uint vDriverVersion;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
        public string szPname;
        public int dwFormats;
        public ushort wChannels;
        public ushort wReserved1;
        public int dwSupport;
    }

    [DllImport("Winmm.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern int waveOutMessage(IntPtr deviceID, uint uMsg, out uint dwParam1, out uint dwParam2);

    public const int WAVE_MAPPER = (-1);

    public const int MMSYSERR_BASE = 0;
    /* general error return values */
    public const int MMSYSERR_NOERROR = 0;                    /* no error */
    public const int MMSYSERR_ERROR = (MMSYSERR_BASE + 1);  /* unspecified error */
    public const int MMSYSERR_BADDEVICEID = (MMSYSERR_BASE + 2);  /* device ID out of range */
    public const int MMSYSERR_NOTENABLED = (MMSYSERR_BASE + 3);  /* driver failed enable */
    public const int MMSYSERR_ALLOCATED = (MMSYSERR_BASE + 4);  /* device already allocated */
    public const int MMSYSERR_INVALHANDLE = (MMSYSERR_BASE + 5);  /* device handle is invalid */
    public const int MMSYSERR_NODRIVER = (MMSYSERR_BASE + 6);  /* no device driver present */
    public const int MMSYSERR_NOMEM = (MMSYSERR_BASE + 7);  /* memory allocation error */
    public const int MMSYSERR_NOTSUPPORTED = (MMSYSERR_BASE + 8);  /* function isn't supported */
    public const int MMSYSERR_BADERRNUM = (MMSYSERR_BASE + 9);  /* error value out of range */
    public const int MMSYSERR_INVALFLAG = (MMSYSERR_BASE + 10); /* invalid flag passed */
    public const int MMSYSERR_INVALPARAM = (MMSYSERR_BASE + 11); /* invalid parameter passed */
    public const int MMSYSERR_HANDLEBUSY = (MMSYSERR_BASE + 12); /* handle being used simultaneously on another thread (eg callback) */
    public const int MMSYSERR_INVALIDALIAS = (MMSYSERR_BASE + 13); /* specified alias not found */
    public const int MMSYSERR_BADDB = (MMSYSERR_BASE + 14); /* bad registry database */
    public const int MMSYSERR_KEYNOTFOUND = (MMSYSERR_BASE + 15); /* registry key not found */
    public const int MMSYSERR_READERROR = (MMSYSERR_BASE + 16); /* registry read error */
    public const int MMSYSERR_WRITEERROR = (MMSYSERR_BASE + 17); /* registry write error */
    public const int MMSYSERR_DELETEERROR = (MMSYSERR_BASE + 18); /* registry delete error */
    public const int MMSYSERR_VALNOTFOUND = (MMSYSERR_BASE + 19); /* registry value not found */
    public const int MMSYSERR_NODRIVERCB = (MMSYSERR_BASE + 20); /* driver does not call DriverCallback */
    public const int MMSYSERR_MOREDATA = (MMSYSERR_BASE + 21); /* more data to be returned */
    public const int MMSYSERR_LASTERROR = (MMSYSERR_BASE + 21); /* last error in range */

    public const int DRV_RESERVED = 0x0800;

    public const int DRVM_MAPPER = (0x2000);
    public const int DRVM_USER = 0x4000;
    public const int DRVM_MAPPER_STATUS = (DRVM_MAPPER + 0);
    public const int DRVM_MAPPER_RECONFIGURE = (DRVM_MAPPER + 1);
    public const int DRVM_MAPPER_PREFERRED_GET = (DRVM_MAPPER + 21);
    public const int DRVM_MAPPER_CONSOLEVOICECOM_GET = (DRVM_MAPPER + 23);

    public const int DRV_QUERYDEVNODE = (DRV_RESERVED + 2);
    public const int DRV_QUERYMAPPABLE = (DRV_RESERVED + 5);
    public const int DRV_QUERYMODULE = (DRV_RESERVED + 9);
    public const int DRV_PNPINSTALL = (DRV_RESERVED + 11);
    public const int DRV_QUERYDEVICEINTERFACE = (DRV_RESERVED + 12);
    public const int DRV_QUERYDEVICEINTERFACESIZE = (DRV_RESERVED + 13);
    public const int DRV_QUERYSTRINGID = (DRV_RESERVED + 14);
    public const int DRV_QUERYSTRINGIDSIZE = (DRV_RESERVED + 15);
    public const int DRV_QUERYIDFROMSTRINGID = (DRV_RESERVED + 16);
    public const int DRV_QUERYFUNCTIONINSTANCEID = (DRV_RESERVED + 17);
    public const int DRV_QUERYFUNCTIONINSTANCEIDSIZE = (DRV_RESERVED + 18);
    //
    // DRVM_MAPPER_PREFERRED_GET flags
    //
    public const int DRVM_MAPPER_PREFERRED_FLAGS_PREFERREDONLY = 0x00000001;

如何通过C＃上的winapi获取默认的播放设备ID？

1 个答案: