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.");
}
}