如何从网络摄像头拍照每一分钟
本文关键字:一分钟 摄像头 网络 | 更新日期: 2023-09-27 17:52:38
我想用我的网络摄像头拍一张快照。这是我的代码:
using System;
using System.Text;
using System.Drawing;
using System.Threading;
using AForge.Video.DirectShow;
using AForge.Video;
namespace WebCamShot
{
class Program
{
static FilterInfoCollection WebcamColl;
static VideoCaptureDevice Device;
static void Main(string[] args)
{
WebcamColl = new FilterInfoCollection(FilterCategory.VideoInputDevice);
Console.WriteLine("Press Any Key To Capture Photo !");
Console.ReadKey();
Device = new VideoCaptureDevice(WebcamColl[0].MonikerString);
Device.NewFrame += Device_NewFrame;
Device.Start();
Console.ReadLine();
}
static void Device_NewFrame(object sender, NewFrameEventArgs e)
{
Bitmap Bmp = (Bitmap)e.Frame.Clone();
Bmp.Save("D:''Foo''Bar.png");
Console.WriteLine("Snapshot Saved.");
/*
Console.WriteLine("Stopping ...");
Device.SignalToStop();
Console.WriteLine("Stopped .");
*/
}
}
}
它工作得很好,但是现在我想用我的代码每隔一分钟拍一次快照。
由于这个原因,我添加了这行代码:Thread.Sleep(1000 * 60); // 1000 Milliseconds (1 Second) * 60 == One minute.
不幸的是,这一行没有给我想要的结果-它仍然像前面一样拍摄快照,但它只是每分钟在文件中保存照片。我真正想做的是,我的代码将触发"Device_NewFrame"事件每隔一分钟。
我该怎么做?我很乐意得到一些帮助。谢谢你!
EDIT:按照Armen Aghajanyan的建议,我在代码中添加了计时器。该定时器每隔一分钟初始化设备对象,将新的设备对象注册到Device_NewFrame事件并启动设备的活动。之后,我取消了事件主体中的注释:
Console.WriteLine("Stopping ...");
Device.SignalToStop();
Console.WriteLine("Stopped .");
现在代码每隔一分钟快照一次
我建议使用Timer。运行事件。实现是直接的和干净的。http://msdn.microsoft.com/en-us/library/system.timers.timer.elapsed (v = vs.110) . aspx
private static void TimerThread(object obj)
{
int delay = (int)obj;
while (true)
{
takePhotos = true;
Thread.Sleep(delay);
}
}
static void Main(string[] args)
{
WebcamColl = new FilterInfoCollection(FilterCategory.VideoInputDevice);
Console.WriteLine("Press Any Key To Capture Photo !");
Console.ReadKey();
Device = new VideoCaptureDevice(WebcamColl[0].MonikerString);
Device.NewFrame += Device_NewFrame;
Device.Start();
Thread timer=new Thread(TimerThread);
timer.Start(60000);
Console.ReadLine();
}
static void Device_NewFrame(object sender, NewFrameEventArgs e)
{
if(!takePhotos)return;
Bitmap Bmp = (Bitmap)e.Frame.Clone();
Bmp.Save("D:''Foo''Bar.png");
takePhotos=false;
Console.WriteLine("Snapshot Saved.");
/*
Console.WriteLine("Stopping ...");
Device.SignalToStop();
Console.WriteLine("Stopped .");
*/
}
声明一个静态变量takePhotos并初始化为true