/// <summary>
/// Starts the video capture
/// </summary>
/// <param name="FrameNumber">the frame number to start at.
/// Set to 0 to let the control allocate the frame number</param>
public void Start(ulong frameNumber)
{
try
{
// for safety, call stop, just in case we are already running
this.Stop();
// setup a capture window
m_captureHandlerWindow = WebCamAPI.capCreateCaptureWindowA("WebCap", 0, 0, 0, ImageWidth, ImageHeight, this.Handle.ToInt32(), 0);
// connect to the capture device
Application.DoEvents();
WebCamAPI.SendMessage(m_captureHandlerWindow, WebCamAPI.WM_CAP_CONNECT, 0, 0);
WebCamAPI.SendMessage(m_captureHandlerWindow, WebCamAPI.WM_CAP_SET_PREVIEW, 0, 0);
// set the capture video format (width and height) to the value of the params given at c'tor
WebCamAPI.BitMapInfo bInfo = new WebCamAPI.BitMapInfo();
bInfo.bmiHeader = new WebCamAPI.BitMapInfoHeader();
bInfo.bmiHeader.biSize = (uint)Marshal.SizeOf(bInfo.bmiHeader);
bInfo.bmiHeader.biWidth = ImageWidth;
bInfo.bmiHeader.biHeight = ImageHeight;
bInfo.bmiHeader.biPlanes = 1;
bInfo.bmiHeader.biBitCount = 24;
IntPtr buffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(bInfo));
Marshal.StructureToPtr(bInfo, (IntPtr)buffer, true);
WebCamAPI.SendMessage(m_captureHandlerWindow, WebCamAPI.WM_CAP_SET_VIDEOFORMAT, Marshal.SizeOf(bInfo), (int)buffer);
// set the frame number
this.FrameNumber = frameNumber;
// set the timer information
//this.m_captureTimer.Interval = this.CaptureInterval;
m_timer.Period = this.CaptureInterval;
m_stopped = false;
m_timer.Start();
//this.m_captureTimer.Start();
}
catch (Exception excep)
{
string errorMsg = "An error ocurred while starting the video capture. Check that your webcamera is connected properly and turned on." +
Environment.NewLine + "Error: " + excep.Message;
MessageBox.Show(this, errorMsg, "Start Failed!", MessageBoxButtons.OK, MessageBoxIcon.Error);
this.Stop();
}
}
