public void CreateAndShow(IntPtr sourceWindow)
{
// register the thumbnail to associate this form's hwnd (where we
// want the thumbnail rendered to) with the parent hwnd
// (which is the window we want the thumbnail of) and put the info
// in the thumbnail handle
m_hThumbnail = DwmApi.DwmRegisterThumbnail(this.Handle, sourceWindow);
// create and set a thumbnail properties to tell the DWM
// how we want the thumbnail to be rendered.
DwmApi.DWM_THUMBNAIL_PROPERTIES m_ThumbnailProperties = new DwmApi.DWM_THUMBNAIL_PROPERTIES();
m_ThumbnailProperties.dwFlags = DwmApi.DWM_THUMBNAIL_PROPERTIES.DWM_TNP_VISIBLE
+ DwmApi.DWM_THUMBNAIL_PROPERTIES.DWM_TNP_OPACITY
+ DwmApi.DWM_THUMBNAIL_PROPERTIES.DWM_TNP_RECTDESTINATION
+ DwmApi.DWM_THUMBNAIL_PROPERTIES.DWM_TNP_SOURCECLIENTAREAONLY;
m_ThumbnailProperties.opacity = 255;
m_ThumbnailProperties.fVisible = true;
m_ThumbnailProperties.rcSource = m_ThumbnailProperties.rcDestination =
new DwmApi.RECT(0, 0, ClientRectangle.Right, ClientRectangle.Bottom);
m_ThumbnailProperties.fSourceClientAreaOnly = true;
// now update the thumbnail properties - this actually starts the live rendering
// in the thumbnail
DwmApi.DwmUpdateThumbnailProperties(m_hThumbnail, m_ThumbnailProperties);
this.Show();
object j = (object)this.ClientRectangle;
//this.DrawToBitmap(Bitmap.FromFile());
}
protected override void Dispose(bool disposing)
{
//if (disposing && (components != null)) components.Dispose();
base.Dispose(disposing);
// when you are done with the thumbnail, unregister it
if (m_hThumbnail != IntPtr.Zero)
{
if (DwmApi.DwmIsCompositionEnabled())
{
DwmApi.DwmUnregisterThumbnail(m_hThumbnail);
}
try
{
m_hThumbnail = IntPtr.Zero;
}
catch (Exception excnorg) { this.Dispose(); }
}
}