среда, 27 сентября 2017 г.

Получение информации об устройствах вывода звука в Windows (с#)

Иногда возникает необходимость определения присутствующих в системе устройств вывода звука, и какие из них активны в текущий момент. Для этих целей можно использовать Windows Multimedia Device API. Его интерфейс IMMDeviceEnumerator позволяет получить список устройств вывода звука (audio endpoints), их тип и различную информацию о них. Однако, в современных звуковых картах часто динамики и наушники представлены одним устройством с точки зрения системы, и выбор, на какое устройство выводить звук, осуществляется в настройках специальной утилиты производителя (или автоматически). В таком случае для определения путей вывода звука в кокретной ситуации можно использовать Device Topology API . С помощью него можно получить информацию о разъемах звукового адаптера и их состоянии.

Для доступа к этим API из c# нам понадобятся декларации неуправляемых структур, инфтерфейсов и т.п. из библиотек Mmdeviceapi.h и Devicetopology.h, а также COM-объекта Property Store:

using System;

using System.Collections.Generic;

using System.Text;

using System.Runtime.InteropServices;

using System.IO;

using System.Runtime.CompilerServices;

 

namespace com_test

{

    class Native

    {

        [DllImport("ole32.Dll")]

        static public extern uint CoCreateInstance(ref Guid clsid,

        [MarshalAs(UnmanagedType.IUnknown)] object inner, uint context, ref Guid uuid,

        [MarshalAs(UnmanagedType.IUnknown)] out object rReturnedComObject);

 

        //************************************************************************

        [DllImport("ole32.dll")]

        private extern static int PropVariantClear(ref PropVariant pvar);

 

        public const int DEVICE_STATE_ACTIVE = 0x00000001;

        public const int DEVICE_STATE_DISABLE = 0x00000002;

        public const int DEVICE_STATE_NOTPRESENT = 0x00000004;

        public const int DEVICE_STATE_UNPLUGGED = 0x00000008;

        public const int DEVICE_STATEMASK_ALL = 0x0000000f;

               

 

        public static PROPERTYKEY PKEY_Device_FriendlyName =

            new PROPERTYKEY(0xa45c254e, 0xdf1c, 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0, 14);

       

        public static PROPERTYKEY PKEY_AudioEndpoint_FormFactor =

            new PROPERTYKEY(0x1da5d803, 0xd492, 0x4edd, 0x8c, 0x23, 0xe0, 0xc0, 0xff, 0xee, 0x7f, 0x0e, 0);

 

    }

 

    enum EndpointFormFactor

    {

        RemoteNetworkDevice = 0,

        Speakers = ( RemoteNetworkDevice + 1 ) ,

        LineLevel           = ( Speakers + 1 ) ,

        Headphones       = ( LineLevel + 1 ) ,

        Microphone        = ( Headphones + 1 ) ,

        Headset  = ( Microphone + 1 ) ,

        Handset  = ( Headset + 1 ) ,

        UnknownDigitalPassthrough    = ( Handset + 1 ) ,

        SPDIF    = ( UnknownDigitalPassthrough + 1 ) ,

        DigitalAudioDisplayDevice      = ( SPDIF + 1 ) ,

        UnknownFormFactor    = ( DigitalAudioDisplayDevice + 1 ) ,

        EndpointFormFactor_enum_count       = ( UnknownFormFactor + 1 )

    };

 

    enum EPcxConnectionType

    {

        eConnTypeUnknown=0,

        eConnType3Point5mm,

        eConnTypeQuarter,

        eConnTypeAtapiInternal,

        eConnTypeRCA,

        eConnTypeOptical,

        eConnTypeOtherDigital,

        eConnTypeOtherAnalog,

        eConnTypeMultichannelAnalogDIN,

        eConnTypeXlrProfessional,

        eConnTypeRJ11Modem,

        eConnTypeCombination

    } ;

 

    enum EPcxGeoLocation

    {

        eGeoLocRear = 0x1,

        eGeoLocFront,

        eGeoLocLeft,

        eGeoLocRight,

        eGeoLocTop,

        eGeoLocBottom,

        eGeoLocRearPanel,

        eGeoLocRiser,

        eGeoLocInsideMobileLid,

        eGeoLocDrivebay,

        eGeoLocHDMI,

        eGeoLocOutsideMobileLid,

        eGeoLocATAPI,

        eGeoLocNotApplicable,

        eGeoLocReserved6,

        EPcxGeoLocation_enum_count

    } ;

 

    public enum EDataFlow

    {

        eRender,

        eCapture,

        eAll,

        EDataFlow_enum_count

    }

 

    public enum ERole

    {

        eConsole,

        eMultimedia,

        eCommunications,

        ERole_enum_count

    }

 

    public enum CLSCTX

    {

        CLSCTX_INPROC_SERVER = 0x1,

        CLSCTX_INPROC_HANDLER = 0x2,

        CLSCTX_LOCAL_SERVER = 0x4,

        CLSCTX_REMOTE_SERVER = 0x10,

        CLSCTX_SERVER = (CLSCTX_INPROC_SERVER | CLSCTX_LOCAL_SERVER |

                                                 CLSCTX_REMOTE_SERVER),

        CLSCTX_ALL = (CLSCTX_INPROC_HANDLER | CLSCTX_SERVER)

    };

 

    //Windows Core Audio API declarations

    //Источник: http://www.java2s.com/Code/CSharp/Windows/SoundUtils.htm

 

    [Guid("0BD7A1BE-7A1A-44DB-8397-CC5392387B5E"),

        InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

    public interface IMMDeviceCollection

    {      

        int GetCount(ref uint pcDevices);

        int Item(uint nDevice, [Out, MarshalAs(UnmanagedType.Interface)] out object ppDevice);

    }

 

    [Guid("D666063F-1587-4E43-81F1-B948E807363F"),

    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

    public interface IMMDevice

    {

        int Activate(ref Guid iid, uint dwClsCtx, IntPtr pActivationParams,

            [Out, MarshalAs(UnmanagedType.Interface)] out object ppInterface);

 

        int OpenPropertyStore(int stgmAccess, [Out, MarshalAs(UnmanagedType.Interface)] out object ppProperties);

 

        int GetId(ref StringBuilder ppstrId);

 

        int GetState(ref int pdwState);

    }

 

    [ComImport, Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")]

    class MMDeviceEnumerator

    {

    }

 

    [Guid("A95664D2-9614-4F35-A746-DE8DB63617E6"),    

    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

    public interface IMMDeviceEnumerator

    {

 

         int EnumAudioEndpoints(EDataFlow dataFlow, int dwStateMask,

             [Out, MarshalAs(UnmanagedType.Interface)] out object ppDevices);

 

         int GetDefaultAudioEndpoint(EDataFlow dataFlow, ERole role,

             [Out, MarshalAs(UnmanagedType.Interface)] out object ppEndpoint);

               

         int  GetDevice(string pwstrId, ref IntPtr ppDevice);

 

         int  RegisterEndpointNotificationCallback(IntPtr pClient);

 

         int  UnregisterEndpointNotificationCallback(IntPtr pClient);

    }

     

 

    //*********** Property store *****************************

 

    //Источник: https://blogs.msdn.microsoft.com/adamroot/2008/04/11/interop-with-propvariants-in-net/

 

    [ComImport, Guid("886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

    interface IPropertyStore

    {

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]

        void GetCount([Out] out uint cProps);

 

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]

        void GetAt([In] uint iProp, out PROPERTYKEY pkey);

 

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]

        int GetValue([In] ref PROPERTYKEY key, out PropVariant pv);

 

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]

        void SetValue([In] ref PROPERTYKEY key, [In] ref object pv);

 

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]

        void Commit();

    }

 

    [StructLayout(LayoutKind.Sequential, Pack = 4)]

    struct PROPERTYKEY

    {

        public Guid fmtid;

        public uint pid;

 

        public PROPERTYKEY(Guid guid, int propertyId)

        {

            this.fmtid = guid;

            this.pid = (uint)propertyId;

        }

        public PROPERTYKEY(string formatId, int propertyId)

            : this(new Guid(formatId), propertyId)

        {

        }

        public PROPERTYKEY(uint a, uint b, uint c, uint d, uint e, uint f,

            uint g, uint h, uint i, uint j, uint k, int propertyId)

            : this(new Guid((uint)a, (ushort)b, (ushort)c, (byte)d, (byte)e,

                (byte)f, (byte)g, (byte)h, (byte)i, (byte)j, (byte)k), propertyId)

        {

        }

    }

   

    [StructLayout(LayoutKind.Sequential)]

    public struct PropVariant

    {

        ushort vt;

        ushort wReserved1;

        ushort wReserved2;

        ushort wReserved3;

        IntPtr p;

        int p2;

 

        private byte[] GetDataBytes()

        {

            byte[] ret = new byte[IntPtr.Size + sizeof(int)];

            if (IntPtr.Size == 4)

                BitConverter.GetBytes(p.ToInt32()).CopyTo(ret, 0);

            else if (IntPtr.Size == 8)

                BitConverter.GetBytes(p.ToInt64()).CopyTo(ret, 0);

            BitConverter.GetBytes(p2).CopyTo(ret, IntPtr.Size);

            return ret;

        }

 

        sbyte cVal // CHAR cVal;

        {

            get { return (sbyte)GetDataBytes()[0]; }

        }

 

        short iVal // SHORT iVal;

        {

            get { return BitConverter.ToInt16(GetDataBytes(), 0); }

        }

 

        int lVal // LONG lVal;

        {

            get { return BitConverter.ToInt32(GetDataBytes(), 0); }

        }

 

        long hVal // LARGE_INTEGER hVal;

        {

            get { return BitConverter.ToInt64(GetDataBytes(), 0); }

        }

 

        float fltVal // FLOAT fltVal;

        {

            get { return BitConverter.ToSingle(GetDataBytes(), 0); }

        }

 

        public object Value

        {

            get

            {

                switch ((VarEnum)vt)

                {

                    case VarEnum.VT_I1:

                        return cVal;

                    case VarEnum.VT_I2:

                        return iVal;

                    case VarEnum.VT_I4:

                    case VarEnum.VT_INT:

                        return lVal;

                    case VarEnum.VT_UI4:

                    case VarEnum.VT_I8:

                        return hVal;

                    case VarEnum.VT_R4:

                        return fltVal;

                    case VarEnum.VT_FILETIME: return DateTime.FromFileTime(hVal);

                    case VarEnum.VT_BSTR:

                        return Marshal.PtrToStringBSTR(p);

                    case VarEnum.VT_BLOB:

                        byte[] blobData = new byte[lVal];

                        IntPtr pBlobData;

                        if (IntPtr.Size == 4)

                        {

                            pBlobData = new IntPtr(p2);

                        }

                        else if (IntPtr.Size == 8)

                        {

                            pBlobData = new IntPtr(BitConverter.ToInt64(GetDataBytes(), sizeof(int)));

                        }

                        else

                            throw new NotSupportedException();

                        Marshal.Copy(pBlobData, blobData, 0, lVal);

                        return blobData;

                    case VarEnum.VT_LPSTR:

                        return Marshal.PtrToStringAnsi(p);

                    case VarEnum.VT_LPWSTR:

                        return Marshal.PtrToStringUni(p);

                    case VarEnum.VT_UNKNOWN:

                        return Marshal.GetObjectForIUnknown(p);

                    case VarEnum.VT_DISPATCH:

                        return p;

                    default:

                        throw new NotSupportedException("0x"+vt.ToString("X4") + " type not supported");

                }

            }

        }

 

    }

    //*****************************************************

       

    //Device Topology declarations

 

    [Guid("2A07407E-6497-4A18-9787-32F79BD0D98F"),

    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

    public interface IDeviceTopology

    {

        int GetConnectorCount([Out] out int pConnectorCount);

        int GetConnector(int nIndex, out IConnector ppConnector);

        int GetSubunitCount([Out] out int pCount);

        int GetSubunit(int nIndex, out /*ISubunit*/object ppSubunit);

        int GetPartById(int nId, out IPart ppPart);

        int GetDeviceId([Out, MarshalAs(UnmanagedType.LPWStr)] out string ppwstrDeviceId);

        int GetSignalPath(IPart pIPartFrom, IPart pIPartTo, bool bRejectMixedPaths, /*IPartsList*/object ppParts);

    }

 

   

    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown),

    Guid("9c2c4058-23f5-41de-877a-df3af236a09e")]

    public interface IConnector

    {

        int GetType(out int pType);

        int GetDataFlow(out EDataFlow dataFlow);

        int ConnectTo([In] IConnector connector);

        int Disconnect();

        int IsConnected(out bool pbConnected);       

        int GetConnectedTo([MarshalAs(UnmanagedType.Interface)] out object ppConTo);

        int GetConnectorIdConnectedTo(out string ppwstrConnectorId);

        int GetDeviceIdConnectedTo(out string ppwstrDeviceId);

    }

 

    [Guid("AE2DE0E4-5BCA-4F2D-AA46-5D13F8FDB3A9"),

    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

    public interface IPart

    {

        int GetName(out StringBuilder ppwstrName);

        int GetLocalId(out int pnId);

        int GetGlobalId(out StringBuilder ppwstrGlobalId);

        int GetPartType(out int pPartType);

        int GetSubType(out Guid pSubType);

        int GetControlInterfaceCount(out uint pCount);

 

        int GetControlInterface(int nIndex, out /*IControlInterface*/ object ppFunction);

        int EnumPartsIncoming(out /*IPartsList[]*/object ppParts);

        int EnumPartsOutgoing(out /*IPartsList[]*/object ppParts);

              

        int GetTopologyObject([Out,MarshalAs(UnmanagedType.Interface)] out object ppTopology);

 

        int Activate(uint dwClsContext,

                 ref Guid refiid,

                 [MarshalAs(UnmanagedType.Interface)]

             out object interfacePointer);

        int RegisterControlChangeCallback(ref Guid riid, /*IControlChangeNotify*/object pNofity);

        int UnregisterControlChangeCallback(/*IControlChangeNotify*/object pNotify);

    }

 

    [ComVisible(false)]

    [ComImport,

    InterfaceType(ComInterfaceType.InterfaceIsIUnknown),

    Guid("4509F757-2D46-4637-8E62-CE7DB944F57B")]

    public interface IKsJackDescription

    {

        int GetJackCount(out uint jacks);

        int GetJackDescription(uint jack, ref KSJACK_DESCRIPTION pDescription);

    }

 

    [StructLayout(LayoutKind.Sequential)]

    public struct KSJACK_DESCRIPTION

    {

        public uint ChannelMapping;

        public uint Color;

        public uint ConnectionType;

        public uint GeoLocation;

        public uint GenLocation;

        public uint PortConnection;

        public uint IsConnected;

    } ;

 

}

 

Для вывода информации создадим форму в приложении WinForms с элементами TextBox и FlowLayoutPanel.

 

Создадим COM-объект MMDeviceEnumerator и обяъвим необходимые интерфейсы:

 

MMDeviceEnumerator devenum = new MMDeviceEnumerator();// CoClass

IMMDeviceEnumerator deviceEnumerator = (IMMDeviceEnumerator)devenum;

IMMDeviceCollection deviceCollection = null;

IMMDevice dev = null;

IMMDevice defDevice=null;

IPropertyStore propertyStore=null;

 

Устройство выода звука по умолчанию и его FriendlyName можно получить так:

 

deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eConsole, out o);

defDevice = o as IMMDevice;

 

defDevice.OpenPropertyStore(0/*STGM_READ*/, out o);               

propertyStore = o as IPropertyStore;

PropVariant name = new PropVariant();

propertyStore.GetValue(Native.PKEY_Device_FriendlyName, out name);

 

Для получения списка всех устройств используем следующий код:

 

deviceEnumerator.EnumAudioEndpoints(EDataFlow.eRender, 0x0000000F /*DEVICE_STATEMASK_ALL*/, out o);               

deviceCollection = o as IMMDeviceCollection;

uint deviceCount = 0;

deviceCollection.GetCount(ref deviceCount);

 

Для вывода информации по устройству создадим метод PrintDevice

 

string PrintDevice(IMMDevice dev)

{

            IPropertyStore propertyStore = null;

            IDeviceTopology pDeviceTopology = null;

            IConnector pConnFrom = null;

            IConnector pConnTo = null;

            IPart pPart = null;

            IKsJackDescription pJackDesc = null;

            KSJACK_DESCRIPTION desc = new KSJACK_DESCRIPTION();

 

            StringBuilder res = new StringBuilder(300);

            StringBuilder id = new StringBuilder(500);

            object o = null;

           

            int state = 0;

            uint con_count = 0;

 

            FlowLayoutPanel pan = new FlowLayoutPanel();

           

            pan.Width = 390;

            pan.Height = 100;

            pan.FlowDirection = FlowDirection.TopDown;

            pan.WrapContents = false;

 

            try

            {

 

                //*********

                id = new StringBuilder(500);

                dev.GetId(ref id);               

                //*********

 

                //имя устройства

                dev.OpenPropertyStore(0/*STGM_READ*/, out o);                

                propertyStore = o as IPropertyStore;

 

                PropVariant friendlyName = new PropVariant();

                propertyStore.GetValue(Native.PKEY_Device_FriendlyName, out friendlyName);               

                res.AppendLine(friendlyName.Value.ToString());

 

                TextBox tb = new TextBox();

                tb.Text = friendlyName.Value.ToString();

                tb.Width = pan.Width - 10;

                tb.ReadOnly = true;

                pan.Controls.Add(tb);

 

                Label lab;

                lab = new Label(); lab.AutoSize = true;

                lab.Text = "ID: "+id.ToString(); pan.Controls.Add(lab);

 

                //form factor

                PropVariant FormFactor = new PropVariant();

                propertyStore.GetValue(Native.PKEY_AudioEndpoint_FormFactor, out FormFactor);               

                EndpointFormFactor f=EndpointFormFactor.UnknownFormFactor;

                Enum.TryParse<EndpointFormFactor>(FormFactor.Value.ToString(), out f);

                res.AppendLine("Form factor: " + f.ToString());

 

                lab = new Label(); lab.AutoSize = true;

                lab.Text = "Form factor: " + f.ToString();pan.Controls.Add(lab);

 

                //состояние устройства

                dev.GetState(ref state);               

 

                string str="";

                switch (state)

                {

                    case Native.DEVICE_STATE_ACTIVE: str=("State: Active"); break;

                    case Native.DEVICE_STATE_DISABLE: str = ("State: Disabled"); break;

                    case Native.DEVICE_STATE_NOTPRESENT: str = ("State: Not present"); break;

                    case Native.DEVICE_STATE_UNPLUGGED: str = ("State: Unplugged"); break;

                }

                res.AppendLine(str);

 

                lab = new Label(); lab.AutoSize = true;

                lab.Text = str; pan.Controls.Add(lab);

 

                /* DEVICE TOPOLOGY */

                Guid iidDeviceTopology = new Guid("2A07407E-6497-4A18-9787-32F79BD0D98F");

                dev.Activate(ref iidDeviceTopology, (uint)CLSCTX.CLSCTX_ALL, IntPtr.Zero, out o);               

                pDeviceTopology = o as IDeviceTopology;

 

                pDeviceTopology.GetConnector(0, out pConnFrom);               

 

                try

                {

                    o = null;

                    pConnFrom.GetConnectedTo(out o);

                    pConnTo = o as IConnector;                    

 

                    pPart = (IPart)pConnTo;//QueryInterface

 

                    Guid iidKsJackDescription = new Guid("4509F757-2D46-4637-8E62-CE7DB944F57B");

                    pPart.Activate((uint)CLSCTX.CLSCTX_INPROC_SERVER, iidKsJackDescription, out o);                   

                    pJackDesc = (IKsJackDescription)o;

 

                    if (pJackDesc != null)

                    {

                        con_count = 0;

                        pJackDesc.GetJackCount(out con_count);

                        if (con_count > 0)

                        {

                            StringBuilder sb ;

                            Bitmap bmp;

 

                            //отобразить информацию о разъемах

                            for (uint i = 0; i < con_count; i++)

                            {

                                pJackDesc.GetJackDescription(i, ref desc);                               

                                                            

                                sb= new StringBuilder(100);

                                EPcxConnectionType con_type = (EPcxConnectionType)desc.ConnectionType;

                                EPcxGeoLocation loc = (EPcxGeoLocation)desc.GeoLocation;

                                res.Append("* ");

 

                                switch (con_type)

                                {

                                    case EPcxConnectionType.eConnType3Point5mm: sb.Append("Разъем 3.5 мм ");

                                        break;

                                    case EPcxConnectionType.eConnTypeAtapiInternal: sb.Append("Разъем ATAPI ");

                                        break;

                                    case EPcxConnectionType.eConnTypeRCA: sb.Append("Разъем RCA ");

                                        break;

                                    case EPcxConnectionType.eConnTypeQuarter: sb.Append("Разъем 1/2 дюйма ");

                                        break;

                                    case EPcxConnectionType.eConnTypeOtherAnalog: sb.Append("Аналоговый разъем ");

                                        break;

                                    case EPcxConnectionType.eConnTypeOtherDigital: sb.Append("Цифровой разъем ");

                                        break;

                                    default: sb.Append(con_type.ToString()+" ");

                                        break;

                                }

 

                                switch (loc)

                                {

                                    case EPcxGeoLocation.eGeoLocFront: sb.Append("- Передняя панель");

                                        break;

                                    case EPcxGeoLocation.eGeoLocRear: sb.Append("- Задняя панель");

                                        break;

                                    case EPcxGeoLocation.eGeoLocHDMI: sb.Append("- HDMI");

                                        break;

                                    case EPcxGeoLocation.eGeoLocNotApplicable: sb.Append("- Расположение не определено");

                                        break;

                                    default: sb.Append("- "+loc.ToString());

                                        break;

                                }

                                if (desc.IsConnected == 0) sb.Append(" (Отключен)");

 

                                res.AppendLine(sb.ToString());

                                bmp = new Bitmap(pan.Width , 20);

                               

                                //генерация изображения

                                Graphics g = Graphics.FromImage(bmp);

                                using (g)

                                {

                                    //цвет получается сочетанием desc.Color и 0xFF для альфа-канала

                                    Pen pen = new Pen(Color.FromArgb((int)(desc.Color | 0xFF000000)));

                                    g.FillRectangle(SystemBrushes.Control, 0.0f, 0.0f, bmp.Width, bmp.Height);

                                    using (pen)

                                    {

                                        pen.Width = 5;

                                        g.DrawEllipse(pen, 2, 2, 15, 15);//нарисовать круг, используя цвет разъема

                                        Font fnt = new System.Drawing.Font(new FontFamily("Arial"), 9.0f);

                                        g.DrawString(sb.ToString(),fnt, Brushes.Black, 21, 0,StringFormat.GenericDefault);

                                    }

                                }

 

                                PictureBox pb = new PictureBox();

                                pb.Image = bmp;

                                pb.SizeMode = PictureBoxSizeMode.AutoSize;

                                pan.Controls.Add(pb);

                               

                            }//end for

                        }

                        else

                        {

                            res.AppendLine("* Нет разъемов");

                            lab = new Label(); lab.Text = "* Нет разъемов";

                            lab.AutoSize = true;

                            pan.Controls.Add(lab);

                        }

 

                    }

                    else

                    {

                        res.AppendLine("* Не удалось получить информацию о разъемах");

                        lab = new Label(); lab.Text = "* Не удалось получить информацию о разъемах";

                        lab.AutoSize = true;

                        pan.Controls.Add(lab);

                    }

                    ;

 

 

                }

                catch (COMException ex)

                {

                    if ((uint)ex.HResult == 0x80070490 /*E_NOTFOUND*/)

                    {

                        res.AppendLine("Не подключен");

                        lab = new Label(); lab.Text = "* Не подключен";

                        lab.AutoSize = true;

                        pan.Controls.Add(lab);

                    }

                    else

                    {

                        res.AppendLine("COM error: " + ex.Message);

                        lab = new Label(); lab.Text = "COM error: " + ex.Message;

                        lab.AutoSize = true;

                        pan.Controls.Add(lab);

                    }

                }

                catch (Exception ex)

                {

                    res.AppendLine("Не удалось получить информацию о разъемах: " + ex.Message);

                    lab = new Label(); lab.Text = "Не удалось получить информацию о разъемах: " + ex.Message;

                    lab.AutoSize = true;

                    pan.Controls.Add(lab);

                }               

 

            }

            finally

            {

                //clean up resources               

                if (dev != null) Marshal.ReleaseComObject(dev);

                if (propertyStore != null) Marshal.ReleaseComObject(propertyStore);

 

                if (pDeviceTopology != null) { Marshal.ReleaseComObject(pDeviceTopology); pDeviceTopology = null; }

                if (pConnFrom != null) { Marshal.ReleaseComObject(pConnFrom); pConnFrom = null; }

                if (pConnTo != null) { Marshal.ReleaseComObject(pConnTo); pConnTo = null; }

                if (pPart != null) { Marshal.ReleaseComObject(pPart); pPart = null; }

                if (pJackDesc != null) { Marshal.ReleaseComObject(pJackDesc); pJackDesc = null; }               

            }

 

            int h = 0;

            foreach (Control c in pan.Controls){if (c.Bottom > h) h = c.Bottom;}

            pan.Height = h+10;

 

            flowLayoutPanel1.Controls.Add(pan);          

            return res.ToString();

}

 

Сначала мы с помощью IMMDevice и IPropertyStore получаем общие свойства устройств. Затем получаем IDeviceTopology и находим объект IConnector, который символизирует разъемы нашего устройства. Из него получаем IKsJackDescription, который выдает список разъемов. Для разъемов можно узнать тип порта, его расположение (даже его цвет), а также статус (подключен/не подключен). Следует отметить, что не у всех разъемов есть электрический детектор подключения - для них статус всегда будет "Подключено". Используя эти данные, генерируем картинки разъемов и вставляем во FlowLayoutPanel.

 

Используем данную функцию для вывода всех устройств:

 

textBox1.Text = "Устройство по умолчанию : " + name.Value.ToString();

flowLayoutPanel1.Controls.Clear();

 

for (uint i = 0; i < deviceCount; i++)//вывести информацию о устройствах

{

        deviceCollection.Item(i, out o);

        dev = o as IMMDevice;

 

        PrintDevice(dev);                  

 

        //clean up resources

        if (dev != null) { Marshal.ReleaseComObject(dev); dev = null; }                                       

}

 

Окончательная очистка ресурсов COM:

 

if (devenum != null) Marshal.ReleaseComObject(devenum);

if (deviceEnumerator != null) Marshal.ReleaseComObject(deviceEnumerator);

if (deviceCollection != null) Marshal.ReleaseComObject(deviceCollection);

if (dev != null) Marshal.ReleaseComObject(dev);

if (defDevice != null) Marshal.ReleaseComObject(defDevice);

if (propertyStore != null) Marshal.ReleaseComObject(propertyStore);

 

Результат работы программы представлен на рисунке

 

 

Полный проект (VS2012)

Обновлено 28.09.2017: исправлена ошибка, приводящая к Access Violation на x86-системах

вторник, 19 сентября 2017 г.

Обновление Small Media Player - v2.0

Вышла новая версия проигрывателя Small Media Player.

Список изменений

  • Добавлена поддержка Windows 10
  • Изменен интерфейс, теперь список воспроизведения и обложка автоматически изменяют размер при изменении размеров главного окна
  • В главном окне добавлена краткая информация о форматах аудио и видео в воспроизводимом файле
  • Добавлено выделение стрелкой текущего файла в списке воспроизведения
  • Опция отображения фонового рисунка заменена на аналогичную опцию отображения рисунка при отсутствии обложки
  • Настройки программы и список воспроизведения теперь хранятся в папке "Мои документы"
  • Если включено запоминание позиции, запоминается также громкость.
  • m4a добавлен в список обрабатываемых расширений
  • Программа теперь собрана с помощью Visual C++ 2012


Скачать Small Media Player 2.0

суббота, 14 января 2017 г.

WinForms Excel Library 1.1 update

WinForms Excel Library version 1.1 was released. Changes:
  • Fixed bug when saved file was not accessible until application is closed after using SaveIntoFile method
  • AdvancedDataGrid: added property "Inactive", allows to prevent user from interacting with control
  • New contrtol C_AdvancedDataGrid.

More information about WinForms Excel library