C#控制音量、实现摄像头

来源：互联网发布：帝国cms 模型id 编辑：程序博客网时间：2024/04/30 06:58

作者：kutekute

转自：http://blog.csdn.net/kutekute/article/details/8037795

api控制音量很简单，就是两个方法：

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[DllImport("Winmm.dll")]
private static extern int waveOutSetVolume(int hwo, System.UInt32 pdwVolume))//设置音量

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[DllImport("Winmm.dll")]
private static extern uint waveOutGetVolume(int hwo,out System.UInt32 pdwVolume); //获取音量

有些地方在两个参数中用的都是long类型，那样会引发错误，因为WinAPI的long类型是32位的,而C#的long是64位的,这就导致堆栈不对称。

第一个参数是波形文件输出设备标识符，可以用0，表示使用首选设备；第二个参数为音量大小，是一个32位的整数，低16位表示左声道的音量，高16位表示右声道的音量，范围从0x0000～0xFFFF。

注意之前还要使用命名空间：

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using System.Runtime.InteropSerices;

现在直接调用这两个方法就可以实现音量的设置和获取了，是不是很简单呢？

不过我们现在是要吧音量控制和c＃的trackBar控件联系起来。

看一下下面的方法吧：

//设置音量

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System.UInt32 Value = (System.UInt32)((double)0xffff * (double)trackBar1.Value / (double)(trackBar1.Maximum - trackBar1.Minimum));//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 << 16 | right); //"<<"左移，“|”逻辑或运算

//获取音量（基本上像是设置音量的逆，就不多解释了。）

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uint v;
IntPtr p = new IntPtr(0);
uint i = waveOutGetVolume(p, out v);
uint vleft = v & 0xFFFF;
uint vright = (v & 0xFFFF0000) >> 16;
trackBar1.Value = (int.Parse(vleft.ToString()) | int.Parse(vright.ToString())) * (this.trackBar1.Maximum - this.trackBar1.Minimum) / 0xFFFF;

转自：http://blog.csdn.net/mchp/article/details/3995970

C#实现摄像头

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using AForge;
using AForge.Video;
using AForge.Video.DirectShow;
using AForge.Imaging;
using AForge.Imaging.Filters;
namespace Camera
{
public partial class Form1 : Form
{
private FilterInfoCollection videoDevices;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
try
{
// 枚举所有视频输入设备
videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
if (videoDevices.Count == 0)
throw new ApplicationException();
foreach (FilterInfo device in videoDevices)
{
tscbxCameras.Items.Add(device.Name);
}
tscbxCameras.SelectedIndex = 0;
}
catch (ApplicationException)
{
tscbxCameras.Items.Add("No local capture devices");
videoDevices = null;
}
}
private void toolStripButton1_Click(object sender, EventArgs e)
{
CameraConn();
}
private void CameraConn()
{
VideoCaptureDevice videoSource = new VideoCaptureDevice(videoDevices[tscbxCameras.SelectedIndex].MonikerString);
videoSource.DesiredFrameSize = new Size(320, 240);
videoSource.DesiredFrameRate = 1;
videPlayer.VideoSource = videoSource;
videPlayer.Start();
}
private void toolStripButton2_Click(object sender, EventArgs e)
{
videPlayer.SignalToStop();
videPlayer.WaitForStop();
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
toolStripButton2_Click(null, null);
}
}
}

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