/// <summary>
/// Creates a screenshot from a hidden window
/// </summary>
/// <example>
/// <code>
/// <![CDATA[
/// IntPtr hwnd = ... ;
/// Bitmap capture = ScreenShot.CreateFromHidden(hwnd);
/// ]]>
/// </code>
/// </example>
/// <param name="windowHandle">Handle of window</param>
/// <returns></returns>
public static Bitmap CreateFromHidden(IntPtr windowHandle)
{
Bitmap bitmap = null;
try
{
NativeMethods.RECT rectangle;
NativeMethods.GetWindowRect(windowHandle, out rectangle);
bitmap = new Bitmap(rectangle.Width, rectangle.Height);
using (Graphics gfx = Graphics.FromImage(bitmap))
{
IntPtr hdc = gfx.GetHdc();
NativeMethods.PrintWindow(windowHandle, hdc, 0);
gfx.ReleaseHdc(hdc);
gfx.Dispose();
}
}
catch
{
if (bitmap != null)
{
bitmap.Dispose();
}
}
return(bitmap);
}
/// <summary>
/// Creates a screenshot from a hidden window using a different method
/// </summary>
/// <example>
/// <code>
/// <![CDATA[
/// IntPtr hwnd = ... ;
/// Bitmap capture = ScreenShot.CreateFromHidden(hwnd);
/// ]]>
/// </code>
/// </example>
/// <param name="windowHandle">Handle of window</param>
/// <returns></returns>
public static Bitmap CreateFromHidden2(IntPtr windowHandle)
{
Bitmap bmpScreen = null;
try
{
Rectangle r;
using (Graphics windowGraphic = Graphics.FromHdc(NativeMethods.GetWindowDC(windowHandle)))
r = Rectangle.Round(windowGraphic.VisibleClipBounds);
bmpScreen = new Bitmap(r.Width, r.Height);
using (Graphics g = Graphics.FromImage(bmpScreen))
{
IntPtr hdc = g.GetHdc();
try
{
NativeMethods.PrintWindow(windowHandle, hdc, 0);
}
finally
{
g.ReleaseHdc(hdc);
}
}
}
catch
{
if (bmpScreen != null)
{
bmpScreen.Dispose();
}
}
return(bmpScreen);
}
/// <summary>
/// creates a screenshot from a hidden window
/// </summary>
/// <example>
/// <code>
/// <![CDATA[
/// IntPtr hwnd = ... ;
/// Bitmap capture = ScreenShot.CreateFromHidden(hwnd);
/// ]]>
/// </code>
/// </example>
/// <param name="WindowHandle">handle of window</param>
/// <returns></returns>
public static Bitmap CreateFromHidden(IntPtr WindowHandle)
{
Bitmap bmpScreen = null;
try
{
Rectangle R = Rectangle.Empty;
using (Graphics WindowGraphic = System.Drawing.Graphics.FromHdc(NativeMethods.GetWindowDC(WindowHandle)))
R = Rectangle.Round(WindowGraphic.VisibleClipBounds);
bmpScreen = new Bitmap(R.Width, R.Height);
using (Graphics g = Graphics.FromImage(bmpScreen))
{
IntPtr Hdc = g.GetHdc();
try
{
NativeMethods.PrintWindow(WindowHandle, Hdc, (uint)0);
}
finally
{
g.ReleaseHdc(Hdc);
}
}
}
catch
{
if (bmpScreen != null)
{
bmpScreen.Dispose();
}
}
return(bmpScreen);
}