获取默认的音频/video设备
我正在使用dotNet c＃。 我需要识别默认的video和音频设备我知道我可以枚举音频设备，但如何确定默认设备？ ManagementObjectSearcher mo = new ManagementObjectSearcher（“select * from Win32_SoundDevice”）;
foreach (ManagementObject soundDevice in mo.Get()) { String deviceId = soundDevice.GetPropertyValue("DeviceId").ToString(); String name = soundDevice.GetPropertyValue("Name").ToString(); String status = soundDevice.GetPropertyValue("StatusInfo").ToString(); } 超级晚会，但我最近努力弄清楚如何获得音频设备信息，而不依赖像NAudio这样的第三方项目。 注册表似乎跟上音频播放和录制设备的更改。 这应该为您提供获取已启用或活动的音频录制或播放设备的名称的方法。 不能说它会永远完美无缺，但它现在对我有用。 我是C＃的新手，所以在阅读评论时请记住这一点。
using Microsoft.Win32; using System; namespace RetrieveAudioDeviceInfo { class Program { static void Main(string[] args) { string RequestedDeviceStatus = "Active"; // Initialize string variable for storing audio device status of interest. Valid input = "Active" or "Enabled" string RequestedDeviceType = "Playback"; // Initialize string variable for storing audio device type of interest. Valid input = "Playback" or "Recording" if (!String.Equals(RequestedDeviceStatus, "Active", StringComparison.OrdinalIgnoreCase) && !String.Equals(RequestedDeviceStatus, "Enabled", StringComparison.OrdinalIgnoreCase)) // Check RequestedDeviceStatus to ensure valid input was provided { Console.WriteLine("Invalid AudioDeviceStatus specified. Info request canceled"); // Output info to event log Console.ReadLine(); // Wait for user input return; // Immediately stop processing the inline function } string DeviceRegistryName; // Declare string variable for storing the registry name for the device type of interest if (String.Equals(RequestedDeviceType, "Playback", StringComparison.OrdinalIgnoreCase)) // Check if info request is for playback devices DeviceRegistryName = "Render"; // Set the DeviceRegistryName else if (String.Equals(RequestedDeviceType, "Recording", StringComparison.OrdinalIgnoreCase)) // Check if info request is for recording devices DeviceRegistryName = "Capture"; // Set the DeviceRegistryName else { Console.WriteLine("Invalid AudioDeviceType specified. Info request canceled"); // Output info to event log Console.ReadLine(); // Wait for user input return; // Immediately stop processing the inline function } RegistryKey RootKey; // Initialize RegistryKey for containing the root (base) key to evaluate if (Environment.Is64BitOperatingSystem) // Check if operating system is 64-bit RootKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64); // Opens registry's LocalMachine key with a 64-bit view else RootKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32); // Opens registry's LocalMachine key with a 32-bit view string AudioKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio"; // Parent registry key for audio devices string DeviceName, DeviceType; // Declare string variables for storing audio device information string[] ActiveDeviceRoles = null; // Initialize string array for storing information about the active devices for each audio role using (RegistryKey ChildKey = RootKey.OpenSubKey(AudioKey)) // Open subkey of AudioKey and store in ChildKey. "using" implemented for proper disposal. { foreach (string ChildKeyName in ChildKey.GetSubKeyNames()) // Loop through each SubKeyName in ChildKey { if (ChildKeyName == DeviceRegistryName) // Check if ChildKeyName is "Render" (signifies registry folder for audio playback devices) { using (RegistryKey RenderKey = ChildKey.OpenSubKey(ChildKeyName)) // Open subkey of ChildKey and store in RenderKey. "using" implemented for proper disposal. { DateTime[] ActiveDeviceRoleTimes = null; // Initialize DateTime array for storing times when audio devices last held a particular audio role int j = 1; // Initialize integer variable for tracking audio playback device count foreach (string DeviceKeyName in RenderKey.GetSubKeyNames()) // Loop through each SubKeyName in RenderKey { using (RegistryKey DeviceKey = RenderKey.OpenSubKey(DeviceKeyName)) // Open subkey of RenderKey and store in DeviceKey. "using" implemented for proper disposal. { if (Convert.ToInt32(DeviceKey.GetValue("DeviceState")) == 1) // Check if current audio device is enabled { string CurrentDeviceInfo; // Declare string variable for storing information about the current audio device using (RegistryKey DeviceKeyProperties = DeviceKey.OpenSubKey("Properties")) // Open "Properties" subkey of DeviceKey and store in DeviceKeyProperties. "using" implemented for proper disposal. { DeviceName = DeviceKeyProperties.GetValue("{b3f8fa53-0004-438e-9003-51a46e139bfc},6").ToString(); // Retrieve the current device's name from the registry DeviceType = DeviceKeyProperties.GetValue("{a45c254e-df1c-4efd-8020-67d146a850e0},2").ToString(); // Retrieve the current device's type from the registry CurrentDeviceInfo = DeviceType + " (" + DeviceName + ")"; // Combine the DeviceName and DeviceType info similar to how VoiceAttack displays this data in the Options menu if (String.Equals(RequestedDeviceStatus, "Enabled", StringComparison.OrdinalIgnoreCase)) // Check if user wants to show which audio devices are enabled { Console.WriteLine("Audio " + RequestedDeviceType + " Device " + j++ + " = " + CurrentDeviceInfo); // Output the CurrentDeviceInfo to the event log continue; // Continue with next index in parent for loop } } string[] roles = { "Role:0", "Role:1", "Role:2" }; // Initialize string array for storing the names of the different audio roles DateTime[] CurrentDeviceRoleTimes = new DateTime[roles.Length]; // Initialize DateTime array for storing times when the current audio devices last held a particular audio role //Console.WriteLine("Audio " + RequestedDeviceType + " Device " + j++ + " = " + CurrentDeviceInfo); // Output the CurrentDeviceInfo to the event log. Useful for debuging for (int i = 0; i < roles.Length; i++) // Loop based on the size of the roles string array { byte[] RegistryData = (byte[])DeviceKey.GetValue(roles[i]); // Extract audio device role data from the registry if (RegistryData == null) // Check if the extracted data is null continue; // Continue to next index in parent for loop CurrentDeviceRoleTimes[i] = GetRoleDateTime(RegistryData); // Retrieve role information from registry, convert this data to a DateTime, and store it //Console.WriteLine(roles[i] + " = " + CurrentDeviceRoleTimes[i].ToString()); // Output info to event log. Useful for debuging } if (ActiveDeviceRoles == null || ActiveDeviceRoles.Length == 0) // Check if ActiveDeviceRoles is null or empty { ActiveDeviceRoles = new string[roles.Length]; // Initialize ActiveDeviceRoles string array ActiveDeviceRoleTimes = new DateTime[roles.Length]; // Initialize ActiveDeviceRoleTImes DateTime array } for (int i = 0; i < roles.Length; i++) // Loop based on the size of the roles string array { if (ActiveDeviceRoleTimes[i] < CurrentDeviceRoleTimes[i]) // Check if the ActiveDeviceRoleTime at the current index is less than the CurrentDeviceRoleTime at this index { ActiveDeviceRoles[i] = CurrentDeviceInfo; // Set ActiveDeviceRoles at current index to CurrentDeviceInfo ActiveDeviceRoleTimes[i] = CurrentDeviceRoleTimes[i]; // Set ActiveDeviceRoleTime at current index to corresponding CurrentDeviceRoleTime at this index } } } } } } } } } if (!String.Equals(RequestedDeviceStatus, "Enabled", StringComparison.OrdinalIgnoreCase)) // Check if user does NOT want to see the enabled devices { if (ActiveDeviceRoles != null) // Check if ActiveDeviceRoles is not null (ie, enabled device data has been found and stored) { for (int i = 0; i < ActiveDeviceRoles.Length; i++) // Loop based on the size of the ActiveDeviceRoles string array { string RoleName = null; // Initialize string variable for storing role description switch (i) // Create switch statement based on integer i { case 0: // For case where i = 0 RoleName = "Default"; // Set RoleName break; // Break out of switch statement case 1: // For case where i = 1 // There is the "Multimedia" role, but I don't believe this is currently used by Windows. // The code for this role will remain for possible future use. //RoleName = "Multimedia"; // Set RoleName //break; // Break out of switch statement continue; // Immediately continue with next index in parent for loop case 2: // For case where i = 2 RoleName = "Communications"; // Set RoleName break; // Break out of switch statement } if (ActiveDeviceRoles[i] == null) // Check if ActiveDeviceRole at current index is null Console.WriteLine("{0} {1} Device = {2}", RoleName, RequestedDeviceType, "Not Set"); // Output info to event log else Console.WriteLine("{0} {1} Device = {2}", RoleName, RequestedDeviceType, ActiveDeviceRoles[i]); // Output info to event log } } else Console.WriteLine("No audio playback devices enabled"); // Output info to event log } Console.ReadLine(); } // Function for converting registry data for an audio device into corresponding DateTime information static DateTime GetRoleDateTime(byte[] binary) { if (binary == null || binary.Length != 16) // Check if binary is null or the length is not 16 throw new ArgumentException("Error converting registry data to DateTime"); // Throw an exception int year = Convert.ToInt32(binary[0] + binary[1]*256); // Extract year from registy data int month = Convert.ToInt32(binary[2]); // Extract month from registy data int day = Convert.ToInt32(binary[6]); // Extract day from registy data int hour = Convert.ToInt32(binary[8]); // Extract hour from registy data int minute = Convert.ToInt32(binary[10]); // Extract minute from registy data int seconds = Convert.ToInt32(binary[12]); // Extract seconds from registy data int milliseconds = Convert.ToInt32(binary[14] + binary[15]*256); // Extract milliseconds from registy data return new DateTime(year, month, day, hour, minute, seconds, milliseconds).ToLocalTime(); // Return the converted DateTime data } } } // References: // https://stackoverflow.com/questions/14668091/read-registry-binary-and-convert-to-string // https://msdn.microsoft.com/en-us/library/system.datetime.frombinary(v=vs.110).aspx // https://social.msdn.microsoft.com/Forums/vstudio/en-US/382c06b1-a660-47da-a6e6-a7b27404581a/regbinary-value-from-registry-to-date-format-conversion?forum=csharpgeneral // http://nircmd.nirsoft.net/setdefaultsounddevice.html // https://stackoverflow.com/questions/3121957/how-can-i-do-a-case-insensitive-string-comparison
当前选定的默认设备将始终显示为ID 0。