图片盒中的视频C＃

Question

I have a problem retrieving my video in the picture box in my second form. This is my code

Main.cs

  private void start_video()
    {

        while (!needClose)
        {
            video.capture();
            pictureBox1.Image = ImageFrame.video;
        }
    }


    private void button1_Click(object sender, EventArgs e)
    {
        camera = new Camera();
        camera.Show();
    }

This is my class (of course there is a function that set video)

  public class ImageFrame
  {
   public static Image video { get; set; }
  }

And this is my Camera.cs

 public partial class Camera : Form
{
    private bool test = false;

    public Camera()
    {
        InitializeComponent();
        returnVideo();
    }

   private void returnVideo()
    {
        while (!test)
        {
            pictureBox2.Image = ImageFrame.video;
        }
    }

The video works fine in pictureBox1, but when I click on button1 to open the new form retrieving the same video of pictureBox1 it just freeze. Why? If I don't use the while it would just show a frame but I need the video (that is from the camera, so in live view).

Answer 1

This blocks the event-loop to run, so on every window change UI update will stop and therefore freeze.

    while (!test) // = while(true)
    {
        pictureBox2.Image = ImageFrame.video;
    }

Use a timer to update the picture every 50 msec or less.

EDIT: Some pseudo code:

timer1.Interval=50;
timer1.Tick+=timer1_Tick;
timer1.Start();

void timer1_Tick(..)
{
  pictureBox2.Image = ImageFrame.video;
}

This also reduces CPU load.