public Image TakePicture()
{
if (m_handle == IntPtr.Zero)
{
throw new ObjectDisposedException("WebCam");
}
IDataObject oldData = Clipboard.GetDataObject();
try
{
if (ApiFunctions.SendMessage(m_handle, CaptureMessage.WM_CAP_EDIT_COPY,
IntPtr.Zero, IntPtr.Zero) == IntPtr.Zero)
{
throw new InvalidOperationException("Error copying image to clipboard");
}
if (!Clipboard.ContainsImage())
{
throw new InvalidOperationException("No image on clipboard");
}
return(Clipboard.GetImage());
}
finally
{
Clipboard.SetDataObject(oldData);
}
}
public void Stop()
{
if (m_handle != IntPtr.Zero)
{
ApiFunctions.SendMessage(m_handle, CaptureMessage.WM_CAP_DRIVER_DISCONNECT,
IntPtr.Zero, IntPtr.Zero);
ApiFunctions.DestroyWindow(m_handle);
m_handle = IntPtr.Zero;
}
GC.SuppressFinalize(this);
}
public WebCam(int deviceIndex, IntPtr parentHandle, int width, int height, bool showWindow)
{
m_width = width;
m_height = height;
m_index = deviceIndex;
m_parentHandle = parentHandle;
if (m_parentHandle == IntPtr.Zero)
{
throw new NullReferenceException("parentHandle cannot be 0");
}
WindowStyle windowStyle = WindowStyle.WS_CHILD;
if (showWindow)
{
windowStyle |= WindowStyle.WS_VISIBLE;
}
m_handle = ApiFunctions.capCreateCaptureWindow("WebCam " + deviceIndex,
windowStyle, 0, 0, width, height, parentHandle, 0);
if (m_handle == IntPtr.Zero)
{
throw new InvalidOperationException("Error creating camera window");
}
// Initialize Camera
if (ApiFunctions.SendMessage(m_handle, CaptureMessage.WM_CAP_DRIVER_CONNECT,
new IntPtr(deviceIndex), IntPtr.Zero) == IntPtr.Zero)
{
throw new InvalidOperationException("Error connecting to camera");
}
// Enable preview mode, ensuring our callback will be called
if (ApiFunctions.SendMessage(m_handle, CaptureMessage.WM_CAP_SET_SCALE,
new IntPtr(-1), IntPtr.Zero) == IntPtr.Zero)
{
throw new InvalidOperationException("Error disabling scaling");
}
if (ApiFunctions.SendMessage(m_handle, CaptureMessage.WM_CAP_SET_PREVIEWRATE,
new IntPtr(100), IntPtr.Zero) == IntPtr.Zero)
{
throw new InvalidOperationException("Error setting preview rate");
}
if (ApiFunctions.SendMessage(m_handle, CaptureMessage.WM_CAP_SET_PREVIEW,
new IntPtr(-1), IntPtr.Zero) == IntPtr.Zero)
{
throw new InvalidOperationException("Error enabling preview mode.");
}
}
