c# – 有没有很棒的kernel32哔声(板上发出哔哔声)？

发布时间：2020-12-15 19:36:41 所属栏目：百科来源：网络整理

导读：我想知道是否有人发现了一个很好的哔哔声组合,实际上听起来像音乐. 这是如何调用该方法. [DllImport("Kernel32.dll")]public static extern bool Beep(UInt32 frequency,UInt32 duration);// ... // callBeep(2000,400); 我的第一次尝试： for (int j = 1; j

我想知道是否有人发现了一个很好的哔哔声组合,实际上听起来像音乐.

这是如何调用该方法.

[DllImport("Kernel32.dll")]
public static extern bool Beep(UInt32 frequency,UInt32 duration);
// ... 
// call
Beep(2000,400);

我的第一次尝试：

for (int j = 1; j < 20; j++)
    {
        for (int i = 1; i <= 10; i++)
        {
            Console.Beep(300 * i,200);
        }            
    }

解决方法

您可以使用以下简单的程序来播放使用Beep的旋律：

using System;
using System.Runtime.InteropServices;

class MelodyPlayer
{
    const double ConcertPitch = 440.0;

    class Note
    {
        [DllImport("Kernel32.dll")]
        public static extern bool Beep(UInt32 frequency,UInt32 duration);

        public const int C = -888;
        public const int CSharp = -798;
        public const int DFlat = CSharp;
        public const int D = -696;
        public const int DSharp = -594;
        public const int EFlat = DSharp;
        public const int E = -498;
        public const int F = -390;
        public const int FSharp = -300;
        public const int GFlat = FSharp;
        public const int G = -192;
        public const int GSharp = -96;
        public const int AFlat = GSharp;
        public const int A = 0;
        public const int ASharp = 108;
        public const int BFlat = ASharp;
        public const int B = 204;

        public int Key { get; set; }
        public int Octave { get; set; }
        public uint Duration { get; set; }

        public Note(int key,int octave,uint duration)
        {
            this.Key = key;
            this.Octave = octave;
            this.Duration = duration;
        }

        public uint Frequency
        {
            get
            {
                double factor = Math.Pow(2.0,1.0 / 1200.0);
                return ((uint)(MelodyPlayer.ConcertPitch * Math.Pow(factor,this.Key + this.Octave * 1200.0)));
            }
        }

        public void Play()
        {
            Beep(this.Frequency,this.Duration);
        }
    }

    static void Main(string[] args)
    {
        Note[] melody = new Note[] {
            new Note(Note.C,100),new Note(Note.C,new Note(Note.D,new Note(Note.E,new Note(Note.F,new Note(Note.G,new Note(Note.A,new Note(Note.B,1,2,100)
        };

        foreach (var note in melody)
        {
            note.Play();
        }
    }
}

对于那些感兴趣的人：这使用了Werckmeister temperament并根据为这种气质定义的Cent值计算频率.

（编辑：李大同）

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