C#设置Windows系统音量 试例二 

 1 using System;
 2 using System.Runtime.InteropServices;
 3 using System.Diagnostics;
 4 
 5 namespace GavinTung
 6 {
 7     class SystemMultimediaController
 8     {
 9         /*
10          * 弹出系统音量控制器
11          * */
12         public static void PopupController()
13         {
14             ProcessStartInfo Info = new ProcessStartInfo();
15             Info.FileName = "Sndvol32";
16             Process.Start(Info);
17         }
18 
19         /*
20          * 获得音量范围和获取/设置当前音量
21          * */
22         public static int MaxValue
23        {
24            get { return int.Parse(iMaxValue.ToString()); }
25        }
26         public static int MinValue
27        {
28            get { return int.Parse(iMinValue.ToString()); }
29        }
30         public static int CurrentValue
31         {
32             get {
33                 GetVolume();
34                 return iCurrentValue;
35             }
36             set {
37                 SetValue(MaxValue, MinValue, value);
38             }
39         }
40 
41 
42         #region Private Static Data Members
43         private const UInt32 iMaxValue = 0xFFFF;
44         private const UInt32 iMinValue = 0x0000;
45         private static int iCurrentValue = 0;
46         #endregion
47         #region Private Static Method
48         /*
49          * 得到当前音量
50          **/
51         private static void GetVolume()  
52         {  
53             UInt32 d, v;  
54             d = 0;  
55             long i = waveOutGetVolume(d, out v);  
56             UInt32 vleft = v & 0xFFFF;  
57             UInt32 vright = (v & 0xFFFF0000) >> 16;
58             UInt32 all = vleft | vright;
59             UInt32 value = (all * UInt32.Parse((MaxValue - MinValue).ToString())/((UInt32)iMaxValue)); 
60             iCurrentValue = int.Parse(value.ToString());
61         }  
62 
63         /*
64          * 修改音量值
65          * */
66         private static void SetValue(int aMaxValue , int aMinValue, int aValue)  
67         {  
68             //先把trackbar的value值映射到0x0000～0xFFFF范围  
69             UInt32 Value = (UInt32)((double)0xffff * (double)aValue / (double)(aMaxValue - aMinValue));
70             //限制value的取值范围  
71             if (Value < 0) Value = 0;  
72             if (Value > 0xffff) Value = 0xffff;  
73             UInt32 left = (UInt32)Value;//左声道音量  
74             UInt32 right = (UInt32)Value;//右  
75             waveOutSetVolume(0, left << 16 | right); //"<<"左移，“|”逻辑或运算  
76         }
77         #endregion
78         /*
79          * 在winmm.dll中   
80          *第一个参数可以为0，表示首选设备   
81          *第二个参数为音量:0xFFFF为最大，0x0000为最小，
82          *其中高位（前两位）表示右声道音量，低位（后两位）表示左 声道音量 。
83         */
84         #region Windows Media API
85         [DllImport("winmm.dll")]
86         private static extern long waveOutSetVolume(UInt32 deviceID, UInt32 Volume);
87         [DllImport("winmm.dll")]
88         private static extern long waveOutGetVolume(UInt32 deviceID, out UInt32 Volume);
89         #endregion
90     }
91 }

 

posted @ 2017-11-16 22:39  Weiterli  阅读(6689)  评论(1)    收藏  举报