[英]C# windows forms application volume slider
我有一个使用声音播放器播放.wav文件的应用程序,我查了一下,找不到改变播放音量的方法。我正在寻找的是要么独立地改变文件的音量。该程序或有一个滑块来改变窗口音量混合器中窗口本身的音量。 谢谢!
public void loadSound()
{
sp.Load();
sp.Play();
}
private void timer1_Tick(object sender, EventArgs e)
{
if (BarTimer.Value < BarTimer.Maximum)
{
BarTimer.Value = BarTimer.Value + 1;
}
if(BarTimer.Value==BarTimer.Maximum)
{
loadSound();
timer1.Stop();
BarTimer.Value = BarTimer.Minimum;
}
}
我只在MSDN上发现了这个: 衰减SoundPlayer卷 。
它使用waveOutGetVolume
和waveOutSetVolume
函数。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace VolumeControl
{
public partial class Form1 : Form
{
[DllImport("winmm.dll")]
public static extern int waveOutGetVolume(IntPtr hwo, out uint dwVolume);
[DllImport("winmm.dll")]
public static extern int waveOutSetVolume(IntPtr hwo, uint dwVolume);
public Form1()
{
InitializeComponent();
// By the default set the volume to 0
uint CurrVol = 0;
// At this point, CurrVol gets assigned the volume
waveOutGetVolume(IntPtr.Zero, out CurrVol);
// Calculate the volume
ushort CalcVol = (ushort)(CurrVol & 0x0000ffff);
// Get the volume on a scale of 1 to 10 (to fit the trackbar)
trackWave.Value = CalcVol / (ushort.MaxValue / 10);
}
private void trackWave_Scroll(object sender, EventArgs e)
{
// Calculate the volume that's being set. BTW: this is a trackbar!
int NewVolume = ((ushort.MaxValue / 10) * trackWave.Value);
// Set the same volume for both the left and the right channels
uint NewVolumeAllChannels = (((uint)NewVolume & 0x0000ffff) | ((uint)NewVolume << 16));
// Set the volume
waveOutSetVolume(IntPtr.Zero, NewVolumeAllChannels);
}
}
}
希望它有所帮助。
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