C# 二种方法控制系统音量/麦克风大小

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C# 二种方法控制系统音量/麦克风大小

2024-07-11 11:12| 来源: 网络整理| 查看: 265

场景:在做播放设备的时候需要控制音量的大小，下面几种方法将满足你的要求

方法一: 改变系统音量设置

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 [DllImport("user32.dll")] static extern void keybd_event(byte bVk, byte bScan, UInt32 dwFlags, UInt32 dwExtraInfo); [DllImport("user32.dll")] static extern Byte MapVirtualKey(UInt32 uCode, UInt32 uMapType); private const byte VK_VOLUME_MUTE = 0xAD; private const byte VK_VOLUME_DOWN = 0xAE; private const byte VK_VOLUME_UP = 0xAF; private const UInt32 KEYEVENTF_EXTENDEDKEY = 0x0001; private const UInt32 KEYEVENTF_KEYUP = 0x0002; /// /// 改变系统音量大小，增加 /// public void VolumeUp() { keybd_event(VK_VOLUME_UP, MapVirtualKey(VK_VOLUME_UP, 0), KEYEVENTF_EXTENDEDKEY, 0); keybd_event(VK_VOLUME_UP, MapVirtualKey(VK_VOLUME_UP, 0), KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0); } /// /// 改变系统音量大小，减小 /// public void VolumeDown() { keybd_event(VK_VOLUME_DOWN, MapVirtualKey(VK_VOLUME_DOWN, 0), KEYEVENTF_EXTENDEDKEY, 0); keybd_event(VK_VOLUME_DOWN, MapVirtualKey(VK_VOLUME_DOWN, 0), KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0); } /// /// 改变系统音量大小，静音 /// public void Mute() { keybd_event(VK_VOLUME_MUTE, MapVirtualKey(VK_VOLUME_MUTE, 0), KEYEVENTF_EXTENDEDKEY, 0); keybd_event(VK_VOLUME_MUTE, MapVirtualKey(VK_VOLUME_MUTE, 0), KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0); }

方法二: 改变程序音量，但不改变系统音量设置

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 [DllImport("Winmm.dll")] private static extern int waveOutSetVolume(int hwo, System.UInt32 pdwVolume); [DllImport("Winmm.dll")] private static extern uint waveOutGetVolume(int hwo, out System.UInt32 pdwVolume); #region private int volumeMinScope = 0; private int volumeMaxScope = 100; private int volumeSize = 100; /// /// 音量控制，但不改变系统音量设置 /// public int VolumeSize { get { return volumeSize; } set { volumeSize = value; } } public void SetCurrentVolume() { if (volumeSize < 0) { volumeSize = 0; } if (volumeSize > 100) { volumeSize = 100; } System.UInt32 Value = (System.UInt32)((double)0xffff * (double)volumeSize / (double)(volumeMaxScope - v olumeMinScope));//先把trackbar的value值映射到0x0000～0xFFFF范围 //限制value的取值范围 if (Value < 0) { Value = 0; } if (Value > 0xffff) { Value = 0xffff; } System.UInt32 left = (System.UInt32)Value;//左声道音量 System.UInt32 right = (System.UInt32)Value;//右 waveOutSetVolume(0, left

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C# 二种方法控制系统音量/麦克风大小

C# 二种方法控制系统音量/麦克风大小

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