通过C＃检测耳机是否已插入

没有示例如何通过C＃检测耳机是否插入。

我认为应该是一些事件……

使用WMI有意义吗？

ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\cimv2", "SELECT * FROM Win32_SoundDevice"); foreach (ManagementObject queryObj in searcher.Get()) { Console.WriteLine("-----------------------------------"); Console.WriteLine("Win32_SoundDevice instance"); Console.WriteLine("-----------------------------------"); Console.WriteLine("StatusInfo: {0}", queryObj["StatusInfo"]); } 

有人会很高兴提供它吗？

谢谢！

Answer 1

使用IMMDeviceEnumerator :: RegisterEndpointNotificationCallback方法可以检测此类更改。

如果你想在C＃中处理这个问题，你需要一个托管包装器，它已经由Akos Mattiassich实现。 你可以在这里找到一个例子： MMAudioDeviceApi周围的托管包装器

他说：

该程序可以在所选设备上播放测试声音，并在更改时自动更新列表，例如。 通过控制面板或在物理上插入新设备的情况下。

Answer 2

我不建议您自己使用COM + API。

看看NAudio NuGet包 ：

 Install-Package NAudio 

您应该能够枚举具有插入/拔出状态的音频设备，如下所示：

 var enumerator = new NAudio.CoreAudioApi.MMDeviceEnumerator(); // Allows you to enumerate rendering devices in certain states var endpoints = enumerator.EnumerateAudioEndPoints( DataFlow.Render, DeviceState.Unplugged | DeviceState.Active); foreach (var endpoint in endpoints) { Console.WriteLine("{0} - {1}", endpoint.DeviceFriendlyName, endpoint.State); } // Aswell as hook to the actual event enumerator.RegisterEndpointNotificationCallback(new NotificationClient()); 

NotificationClient的实现方式如下：

 class NotificationClient : NAudio.CoreAudioApi.Interfaces.IMMNotificationClient { void IMMNotificationClient.OnDeviceStateChanged(string deviceId, DeviceState newState) { Console.WriteLine("OnDeviceStateChanged\n Device Id -->{0} : Device State {1}", deviceId, newState); } void IMMNotificationClient.OnDeviceAdded(string pwstrDeviceId) { } void IMMNotificationClient.OnDeviceRemoved(string deviceId) { } void IMMNotificationClient.OnDefaultDeviceChanged(DataFlow flow, Role role, string defaultDeviceId) { } void IMMNotificationClient.OnPropertyValueChanged(string pwstrDeviceId, PropertyKey key) { } } 

应该产生类似的结果：

我认为它在上面的屏幕截图中检测到两次插拔的原因是因为在Macbook上他们使用一个插孔用于麦克风和耳机。

Answer 3

下面是基于IMMNotificationClient接口的（最小）Windows窗体应用程序示例，它不需要任何第三方库。

每当插入/拔出多媒体设备时，您都会收到通知。 然后，您可以查看设备属性并采取适当的操作。 您还可以枚举现有设备并检查耳机是否已插入（请参阅IsConnected属性）。

创建COM互操作

请注意，示例代码包含相关COM对象的定义。 在生产中，我可能会为底层的mmdevapi.dll创建一个COM互操作程序集。 您可以首先从头文件创建一个类型库（需要安装Windows SDK）：

 midl /out c:\tmp /header "C:\Program Files (x86)\Windows Kits\8.1\Include\um\mmdeviceapi.h" "C:\Program Files (x86)\Windows Kits\8.1\Include\um\mmdeviceapi.idl" 

然后，您需要使用tlbimp.exe从typelib生成interop程序集：

 tlbimp /out:MMDevAPI.Interop.dll mmdeviceapi.tlb 

MultiMediaNotificationListener示例

 using System; using System.Runtime.InteropServices; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Reflection; using System.Runtime.CompilerServices; using System.Windows.Forms; namespace MultiMediaNotificationListenerSample { class MainWindow : Form { [STAThread] private static void Main(string[] args) { using (var notificationClient = new MultiMediaNotificationListener()) { Trace.WriteLine(string.Format("Headphone is {0}connected", notificationClient.IsConnected ? "": "not ")); Application.Run(new MainWindow()); } } } class MultiMediaNotificationListener : IMMNotificationClient, IDisposable { private readonly IMMDeviceEnumerator _deviceEnumerator; public MultiMediaNotificationListener() { if (Environment.OSVersion.Version.Major < 6) { throw new NotSupportedException("This functionality is only supported on Windows Vista or newer."); } _deviceEnumerator = (IMMDeviceEnumerator)new MMDeviceEnumerator(); _deviceEnumerator.RegisterEndpointNotificationCallback(this); } ~MultiMediaNotificationListener() { Dispose(false); } public bool IsConnected { get { IMMDeviceCollection deviceCollection; _deviceEnumerator.EnumAudioEndpoints(EDataFlow.eRender, (uint)DeviceState.DEVICE_STATE_ACTIVE, out deviceCollection); uint deviceCount = 0; deviceCollection.GetCount(out deviceCount); for (uint i = 0; i < deviceCount; i++) { IMMDevice device; deviceCollection.Item(i, out device); IPropertyStore propertyStore; device.OpenPropertyStore((uint)STGM.STGM_READ, out propertyStore); PROPVARIANT property; propertyStore.GetValue(ref PropertyKey.PKEY_Device_DeviceDesc, out property); var value = (string)property.Value; Marshal.ReleaseComObject(propertyStore); Marshal.ReleaseComObject(device); if (value == "Headphones") { return true; } } Marshal.ReleaseComObject(deviceCollection); return false; } } public void OnDefaultDeviceChanged(EDataFlow dataFlow, ERole deviceRole, string pwstrDefaultDeviceId) { } public void OnDeviceStateChanged(string pwstrDeviceId, uint dwNewState) { IMMDevice device; _deviceEnumerator.GetDevice(pwstrDeviceId, out device); IPropertyStore propertyStore; device.OpenPropertyStore((uint)STGM.STGM_READ, out propertyStore); Trace.WriteLine(string.Format("OnDeviceStateChanged:\n Device Id {0}\tDevice State {1}", pwstrDeviceId, (DeviceState)dwNewState)); var properties = PropertyKey.GetPropertyKeys() .Select( propertyKey => { PROPVARIANT property; propertyStore.GetValue(ref propertyKey, out property); return new { Key = PropertyKey.GetKeyName(propertyKey), Value = property.Value }; }) .Where(@t => @t.Value != null); foreach (var property in properties) { Trace.WriteLine(string.Format(" {0}\t{1}", property.Key, property.Value)); } Marshal.ReleaseComObject(propertyStore); Marshal.ReleaseComObject(device); } public void OnDeviceAdded(string deviceId) { } public void OnDeviceRemoved(string deviceId) { } public void OnPropertyValueChanged(string pwstrDeviceId, PropertyKey key) { } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } private void Dispose(bool disposing) { _deviceEnumerator.UnregisterEndpointNotificationCallback(this); Marshal.ReleaseComObject(_deviceEnumerator); } } public enum STGM : uint { STGM_READ = 0x0, STGM_WRITE = 0x1, STGM_READWRITE = 0x2 } public enum DeviceState { DEVICE_STATE_ACTIVE = 0x00000001, DEVICE_STATE_DISABLED = 0x00000002, DEVICE_STATE_NOTPRESENT = 0x00000004, DEVICE_STATE_UNPLUGGED = 0x00000008, DEVICE_STATEMASK_ALL = 0x0000000f } [ComImport] [Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")] internal class MMDeviceEnumerator { } public enum EDataFlow { eRender, eCapture, eAll, EDataFlow_enum_count } public enum ERole { eConsole, eMultimedia, eCommunications, ERole_enum_count } [Guid("0BD7A1BE-7A1A-44DB-8397-CC5392387B5E"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown), TypeLibType(TypeLibTypeFlags.FNonExtensible)] [ComImport] public interface IMMDeviceCollection { [MethodImpl(MethodImplOptions.InternalCall)] void GetCount(out uint pcDevices); [MethodImpl(MethodImplOptions.InternalCall)] void Item([In] uint nDevice, [MarshalAs(UnmanagedType.Interface)] out IMMDevice ppDevice); } [Guid("A95664D2-9614-4F35-A746-DE8DB63617E6"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown), TypeLibType(TypeLibTypeFlags.FNonExtensible)] [ComImport] public interface IMMDeviceEnumerator { [MethodImpl(MethodImplOptions.InternalCall)] void EnumAudioEndpoints([ComAliasName("MMDevAPI.Interop.EDataFlow")] [In] EDataFlow dataFlow, [In] uint dwStateMask, [MarshalAs(UnmanagedType.Interface)] out IMMDeviceCollection ppDevices); [MethodImpl(MethodImplOptions.InternalCall)] void GetDefaultAudioEndpoint([ComAliasName("MMDevAPI.Interop.EDataFlow")] [In] EDataFlow dataFlow, [ComAliasName("MMDevAPI.Interop.ERole")] [In] ERole role, [MarshalAs(UnmanagedType.Interface)] out IMMDevice ppEndpoint); [MethodImpl(MethodImplOptions.InternalCall)] void GetDevice([MarshalAs(UnmanagedType.LPWStr)] [In] string pwstrId, [MarshalAs(UnmanagedType.Interface)] out IMMDevice ppDevice); [MethodImpl(MethodImplOptions.InternalCall)] void RegisterEndpointNotificationCallback([MarshalAs(UnmanagedType.Interface)] [In] IMMNotificationClient pClient); [MethodImpl(MethodImplOptions.InternalCall)] void UnregisterEndpointNotificationCallback([MarshalAs(UnmanagedType.Interface)] [In] IMMNotificationClient pClient); } [Guid("D666063F-1587-4E43-81F1-B948E807363F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown), TypeLibType(TypeLibTypeFlags.FNonExtensible)] [ComImport] public interface IMMDevice { [MethodImpl(MethodImplOptions.InternalCall)] void Activate([In] ref Guid iid, [In] uint dwClsCtx, [In] IntPtr pActivationParams, [MarshalAs(UnmanagedType.IUnknown)] out object ppInterface); [MethodImpl(MethodImplOptions.InternalCall)] void OpenPropertyStore([In] uint stgmAccess, [MarshalAs(UnmanagedType.Interface)] out IPropertyStore ppProperties); [MethodImpl(MethodImplOptions.InternalCall)] void GetId([MarshalAs(UnmanagedType.LPWStr)] out string ppstrId); [MethodImpl(MethodImplOptions.InternalCall)] void GetState(out uint pdwState); } [Guid("7991EEC9-7E89-4D85-8390-6C703CEC60C0"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown), TypeLibType(TypeLibTypeFlags.FNonExtensible)] [ComImport] public interface IMMNotificationClient { [MethodImpl(MethodImplOptions.InternalCall)] void OnDeviceStateChanged([MarshalAs(UnmanagedType.LPWStr)] [In] string pwstrDeviceId, [In] uint dwNewState); [MethodImpl(MethodImplOptions.InternalCall)] void OnDeviceAdded([MarshalAs(UnmanagedType.LPWStr)] [In] string pwstrDeviceId); [MethodImpl(MethodImplOptions.InternalCall)] void OnDeviceRemoved([MarshalAs(UnmanagedType.LPWStr)] [In] string pwstrDeviceId); [MethodImpl(MethodImplOptions.InternalCall)] void OnDefaultDeviceChanged([ComAliasName("MMDevAPI.Interop.EDataFlow")] [In] EDataFlow flow, [ComAliasName("MMDevAPI.Interop.ERole")] [In] ERole role, [MarshalAs(UnmanagedType.LPWStr)] [In] string pwstrDefaultDeviceId); [MethodImpl(MethodImplOptions.InternalCall)] void OnPropertyValueChanged([MarshalAs(UnmanagedType.LPWStr)] [In] string pwstrDeviceId, [In] PropertyKey key); } [Guid("886D8EEB-8CF2-4446-8D02-CDBA1DBDCF99"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] [ComImport] public interface IPropertyStore { [MethodImpl(MethodImplOptions.InternalCall)] void GetCount(out uint cProps); [MethodImpl(MethodImplOptions.InternalCall)] void GetAt([In] uint iProp, out PropertyKey pkey); [MethodImpl(MethodImplOptions.InternalCall)] void GetValue([In] ref PropertyKey key, out PROPVARIANT pv); [MethodImpl(MethodImplOptions.InternalCall)] void SetValue([In] ref PropertyKey key, [In] ref PROPVARIANT propvar); [MethodImpl(MethodImplOptions.InternalCall)] void Commit(); } [StructLayout(LayoutKind.Sequential, Pack = 4)] public struct PropertyKey { public static PropertyKey PKEY_Device_DeviceDesc = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 2 }; // DEVPROP_TYPE_STRING public static PropertyKey PKEY_Device_HardwareIds = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 3 }; // DEVPROP_TYPE_STRING_LIST public static PropertyKey PKEY_Device_Service = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 6 }; // DEVPROP_TYPE_STRING public static PropertyKey PKEY_Device_Class = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 9 }; // DEVPROP_TYPE_STRING public static PropertyKey PKEY_Device_Driver = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 11 }; // DEVPROP_TYPE_STRING public static PropertyKey PKEY_Device_ConfigFlags = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 12 }; // DEVPROP_TYPE_UINT32 public static PropertyKey PKEY_Device_Manufacturer = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 13 }; // DEVPROP_TYPE_STRING public static PropertyKey PKEY_Device_FriendlyName = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 14 }; // DEVPROP_TYPE_STRING public static PropertyKey PKEY_Device_LocationInfo = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 15 }; // DEVPROP_TYPE_STRING public static PropertyKey PKEY_Device_Capabilities = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 17 }; // DEVPROP_TYPE_UNINT32 public static PropertyKey PKEY_Device_BusNumber = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 23 }; // DEVPROP_TYPE_UINT32 public static PropertyKey PKEY_Device_EnumeratorName = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 24 }; // DEVPROP_TYPE_STRING public static PropertyKey PKEY_Device_DevType = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 27 }; // DEVPROP_TYPE_UINT32 public static PropertyKey PKEY_Device_Characteristics = new PropertyKey { fmtid = new Guid(unchecked((int)0xa45c254e), unchecked((short)0xdf1c), 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0), pid = 29 }; // DEVPROP_TYPE_UINT32 public static PropertyKey PKEY_Device_ManufacturerAttributes = new PropertyKey { fmtid = new Guid(unchecked((int)0x80d81ea6), unchecked((short)0x7473), 0x4b0c, 0x82, 0x16, 0xef, 0xc1, 0x1a, 0x2c, 0x4c, 0x8b), pid = 4 }; // DEVPROP_TYPE_UINT32 public static PropertyKey PKEY_DeviceClass_IconPath = new PropertyKey { fmtid = new Guid(unchecked((int)0x259abffc), 0x50a7, 0x47ce, 0xaf, 0x8, 0x68, 0xc9, 0xa7, 0xd7, 0x33, 0x66), pid = 12 }; // DEVPROP_TYPE_STRING_LIST public static PropertyKey PKEY_DeviceClass_ClassCoInstallers = new PropertyKey { fmtid = new Guid(unchecked((int)0x713d1703), 0xa2e2, 0x49f5, 0x92, 0x14, 0x56, 0x47, 0x2e, 0xf3, 0xda, 0x5c), pid = 2 }; // DEVPROP_TYPE_STRING_LIST public static PropertyKey PKEY_DeviceInterface_FriendlyName = new PropertyKey { fmtid = new Guid(unchecked((int)0x026e516e), 0xb814, 0x414b, 0x83, 0xcd, 0x85, 0x6d, 0x6f, 0xef, 0x48, 0x22), pid = 2 }; // DEVPROP_TYPE_STRING public Guid fmtid; public uint pid; public static IEnumerable GetPropertyKeys() { var keyFields = typeof(PropertyKey).GetFields(BindingFlags.Public | BindingFlags.Static); return keyFields.Where(fieldInfo => fieldInfo.FieldType == typeof(PropertyKey)) .Select(fieldInfo => (PropertyKey)fieldInfo.GetValue(null)); } public static string GetKeyName(PropertyKey propertyKey) { var keyFields = typeof(PropertyKey).GetFields(BindingFlags.Public | BindingFlags.Static); return keyFields.Select(fieldInfo => new { fieldInfo, value = (PropertyKey)fieldInfo.GetValue(null) }) .Where(@t => propertyKey.pid == @t.value.pid && propertyKey.fmtid == @t.value.fmtid) .Select(@t => @t.fieldInfo.Name).FirstOrDefault(); } } [StructLayout(LayoutKind.Sequential, Pack = 8)] public struct PROPVARIANT { public ushort variantType; public byte wReserved1; public byte wReserved2; public uint wReserved3; public PROPVARIANTVALUE value; public object Value { get { switch ((VarEnum)variantType) { case VarEnum.VT_EMPTY: return null; case VarEnum.VT_NULL: return null; case VarEnum.VT_VARIANT: break; case VarEnum.VT_DECIMAL: return value.cyVal; case VarEnum.VT_VOID: break; case VarEnum.VT_HRESULT: break; case VarEnum.VT_PTR: break; case VarEnum.VT_SAFEARRAY: break; case VarEnum.VT_CARRAY: break; case VarEnum.VT_USERDEFINED: break; case VarEnum.VT_RECORD: break; case VarEnum.VT_STREAM: break; case VarEnum.VT_STORAGE: break; case VarEnum.VT_STREAMED_OBJECT: break; case VarEnum.VT_STORED_OBJECT: break; case VarEnum.VT_BLOB_OBJECT: break; case VarEnum.VT_CF: break; case VarEnum.VT_CLSID: return Marshal.PtrToStructure(value.pVal, typeof(Guid)); case VarEnum.VT_VECTOR: break; case VarEnum.VT_ARRAY: break; case VarEnum.VT_BYREF: break; case VarEnum.VT_I1: return value.cVal; case VarEnum.VT_UI1: return value.bVal; case VarEnum.VT_I2: return value.iVal; case VarEnum.VT_UI2: return value.uiVal; case VarEnum.VT_I4: case VarEnum.VT_INT: return value.intVal; case VarEnum.VT_UI4: case VarEnum.VT_UINT: return value.uintVal; case VarEnum.VT_I8: return value.hVal; case VarEnum.VT_UI8: return value.uhVal; case VarEnum.VT_R4: return value.fltVal; case VarEnum.VT_R8: return value.dblVal; case VarEnum.VT_BOOL: return value.boolVal; case VarEnum.VT_ERROR: return value.scode; case VarEnum.VT_CY: return value.cyVal; case VarEnum.VT_DATE: return value.date; case VarEnum.VT_FILETIME: return DateTime.FromFileTime(value.hVal); case VarEnum.VT_BSTR: return Marshal.PtrToStringBSTR(value.pVal); case VarEnum.VT_BLOB: var blob = value.blob; var blobData = new byte[blob.cbSize]; Marshal.Copy(blob.pBlobData, blobData, 0, (int)blob.cbSize); return blobData; case VarEnum.VT_LPSTR: return Marshal.PtrToStringAnsi(value.pVal); case VarEnum.VT_LPWSTR: return Marshal.PtrToStringUni(value.pVal); case VarEnum.VT_UNKNOWN: return Marshal.GetObjectForIUnknown(value.pVal); case VarEnum.VT_DISPATCH: return value.pVal; //default: // throw new NotSupportedException("The type of this variable is not support ('" + variantType + "')"); } return string.Format("unsupported {0}", ((VarEnum)variantType)); //throw new NotSupportedException("The type of this variable is not support ('" + variantType.ToString() + "')"); } } } [ComConversionLoss] [StructLayout(LayoutKind.Explicit, Pack = 8, Size = 8)] public struct PROPVARIANTVALUE { [FieldOffset(0)] public sbyte cVal; [FieldOffset(0)] public byte bVal; [FieldOffset(0)] public short iVal; [FieldOffset(0)] public ushort uiVal; [FieldOffset(0)] public int intVal; [FieldOffset(0)] public uint uintVal; [FieldOffset(0)] public long hVal; [FieldOffset(0)] public ulong uhVal; [FieldOffset(0)] public float fltVal; [FieldOffset(0)] public double dblVal; [FieldOffset(0)] public short boolVal; [FieldOffset(0)] [MarshalAs(UnmanagedType.Error)] public int scode; [FieldOffset(0)] [MarshalAs(UnmanagedType.Currency)] public decimal cyVal; [FieldOffset(0)] public DateTime date; [FieldOffset(0)] public tagFILETIME filetime; [FieldOffset(0)] public tagARRAY array; [FieldOffset(0)] public tagBLOB blob; [ComConversionLoss] [FieldOffset(0)] public IntPtr pVal; } [ComConversionLoss] [StructLayout(LayoutKind.Sequential, Pack = 4)] public struct tagARRAY { public uint cElems; [ComConversionLoss] public IntPtr pElems; } [ComConversionLoss] [StructLayout(LayoutKind.Sequential, Pack = 4)] public struct tagBLOB { public uint cbSize; [ComConversionLoss] public IntPtr pBlobData; } [StructLayout(LayoutKind.Sequential, Pack = 4)] public struct tagFILETIME { public uint dwLowDateTime; public uint dwHighDateTime; } [StructLayout(LayoutKind.Sequential, Pack = 8)] public struct tagLARGEINTEGER { public long QuadPart; } [StructLayout(LayoutKind.Sequential, Pack = 8)] public struct tagULARGEINTEGER { public ulong QuadPart; } }