.net快速写个录像程序

基本在Windows下的录像程序在底层都是使用了Microsoft的DirectShow接口，对于DirectShow有一个.net的wrapper，称作DirectShowLib。但是封装地并不充分，换个角度说你还是需要知道DirectShow的API然后才能编写摄像头程序，有没有封装地更好地呢，当然有的:).我们可以使用AForge的封装在30分钟左右写出一个摄像程序。

下面是关键代码：

VideoFileWriter writer = new VideoFileWriter();
VideoCaptureDevice videoSource = null;
System.Diagnostics.Stopwatch timer = null;
 
private void video_NewFrame(object sender,NewFrameEventArgs eventArgs)
{
    // get new frame
    Bitmap bitmap = eventArgs.Frame;
    //image.SetPixel(i % width, i % height, Color.Red);
    writer.WriteVideoFrame(bitmap, timer.Elapsed);
 
}
 
private void btnStart_Click(object sender, EventArgs e)
{
    VideoCaptureDeviceForm videoSettings = new VideoCaptureDeviceForm();
    var result =  videoSettings.ShowDialog(this);
    if (result == System.Windows.Forms.DialogResult.Cancel)
    {
        return;
    }
 
    // create video source
    videoSource = videoSettings.VideoDevice;
    // set NewFrame event handler
    videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
    // start the video source
    videoSource.Start();
 
 
    var fileName = string.Format(@"C:\temp\capv\{0}.flv", Guid.NewGuid().ToString());
    FileInfo fInfo = new FileInfo(fileName);
    if (!Directory.Exists(fInfo.DirectoryName))
    {
        Directory.CreateDirectory(fInfo.DirectoryName);
    }
 
    // create new video file
    writer.Open(fileName, 640, 480, 30, VideoCodec.FLV1);
 
    //start a timer to sync the video timeline
    timer = System.Diagnostics.Stopwatch.StartNew();
 
    ShowCurrentStatus("running");
}
 
private void btnStop_Click(object sender, EventArgs e)
{
    videoSource.SignalToStop();
    videoSource.WaitForStop();
    writer.Close();
    ShowCurrentStatus("stop");
}