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<p>You probably run into issues when trying to draw the Bitmaps too fast. The 200ms delay just makes these problems less likely but doesn't really solve it. You could try this code to skip frames that cannot be drawn:</p> <pre><code>namespace TestGUI { public partial class TestGUIForm : Form { private IAsyncResult setBMPResult; private Webcam; private delegate void SetBmpDelegate(Bitmap b); /// <summary> /// Standard constructor. /// </summary> public TestGUIForm() { InitializeComponent(); this.FormClosing += TestGUIForm_FormClosing; cam = new WebCam(); } private void TestGUIForm_FormClosing(object sender, FormClosingEventArgs e) { backgroundWorkerGetFrames.CancelAsync(); } private void buttonConnect_Click(object sender, EventArgs e) { if (cam.IsConnected()) { // if we are already connected, just disable the button and cancel the display thread, the actual disconnection takes place in the *_RunWorkerCompleted method. buttonConnect.Enabled = false; backgroundWorkerGetFrames.CancelAsync(); } else { // connect the camera and start the display background worker. buttonConnect.Enabled = false; try { cam.Connect(); } catch (Exception ex) { MessageBox.Show("Connection error: " + ex.Message); buttonConnect.Enabled = true; return; } buttonConnect.Text = "Disconnect"; backgroundWorkerGetFrames.RunWorkerAsync(); buttonConnect.Enabled = true; } } private void backgroundWorkerGetFrames_DoWork(object sender, DoWorkEventArgs e) { while (!backgroundWorkerGetFrames.CancellationPending) { // capture a new frame cam.Update(); // get the current frame Bitmap bitmap = cam.CalcBitmap(); // set the picturebox-bitmap in the main thread to avoid concurrency issues (a few helper methods required, easier/nicer solutions welcome). this.InvokeSetBmp(bitmap); } } private void InvokeSetBmp(Bitmap bmp) { if (setBMPResult == null || setBMPResult.IsCompleted) { setBMPResult = this.BeginInvoke(new SetBmpDelegate(this.SetImage), bmp); } } private void SetImage(Bitmap bitmap) { Bitmap oldBitmap = (Bitmap)pictureBoxImageStream.Image; pictureBoxImageStream.Image = bitmap; if (oldBitmap != null && oldBitmap != bitmap) oldBitmap.Dispose(); } private void backgroundWorkerGetFrames_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { // disconnect camera and re-enable button. cam.Disconnect(); buttonConnect.Text = "Connect"; buttonConnect.Enabled = true; } } } </code></pre>
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