/// <summary>
/// Draw a rectangle over a window.
/// </summary>
/// <param name="hWnd">Window's handle.</param>
/// <param name="color">Rectangle's color.</param>
///
/// <!-- Source: http://www.codegod.com/find-window-and-highlight-it-with-win32-AID140.aspx -->
public static void DrawRectangle(IntPtr hWnd, Color color)
{
const float penWidth = 2F;
var rc = new RECT();
PInvoke.GetWindowRect(hWnd, ref rc);
var hDC = PInvoke.GetWindowDC(hWnd);
if (hDC != IntPtr.Zero)
{
using (var pen = new Pen(color, penWidth))
{
using (var g = Graphics.FromHdc(hDC))
{
var transp1 = Color.FromArgb(122, color.R, color.G, color.B);
var transp2 = Color.Transparent;
var rect = new Rectangle(0, 0, rc.Right - rc.Left - (int)penWidth,
rc.Bottom - rc.Top - (int)penWidth);
var transBrush = new LinearGradientBrush(rect, transp2, transp1, 45, true);
g.DrawRectangle(pen, rect);
g.FillRectangle(transBrush, rect);
}
}
}
PInvoke.ReleaseDC(hWnd, hDC);
}
/// <summary>
/// Takes a screenshot of desired window.
/// </summary>
/// <param name="hWnd">Window/s handle (IntPtr.Zero for desktop).</param>
/// <returns>Window's screenshot.</returns>
///
/// <!-- Source: http://www.developerfusion.com/code/4630/capture-a-screen-shot/ -->
public static Bitmap Screenshot(IntPtr hWnd)
{
if (hWnd == IntPtr.Zero)
hWnd = PInvoke.GetDesktopWindow();
// get te hDC of the target window
var hdcSrc = PInvoke.GetWindowDC(hWnd);
// get the size
var windowRect = new RECT();
PInvoke.GetWindowRect(hWnd, ref windowRect);
var width = windowRect.Right - windowRect.Left;
var height = windowRect.Bottom - windowRect.Top;
// create a device context we can copy to
var hdcDest = PInvoke.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
var hBitmap = PInvoke.CreateCompatibleBitmap(hdcSrc, width, height);
// select the bitmap object
var hOld = PInvoke.SelectObject(hdcDest, hBitmap);
// bitblt over
PInvoke.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, TernaryRasterOperations.SRCCOPY);
// restore selection
PInvoke.SelectObject(hdcDest, hOld);
// clean up
PInvoke.DeleteDC(hdcDest);
PInvoke.ReleaseDC(hWnd, hdcSrc);
// get a .NET image object for it
var bmp = Image.FromHbitmap(hBitmap);
// free up the Bitmap object
PInvoke.DeleteObject(hBitmap);
//if (!bmp.Size.IsEmpty)
// bmp.Save("IMG\\scrn" + Environment.TickCount + ".bmp", ImageFormat.Bmp);
return bmp;
}
/// <summary>
/// Takes a screenshot of the desired window.
/// </summary>
/// <param name="hWnd">Window's handle (IntPtr.Zero for desktop).</param>
/// <returns>Window's screenshot.</returns>
///<remarks>Very slow.. Use 'Screenshot' method instead.</remarks>
public static Bitmap ScreenshotWithGetPixel(IntPtr hWnd)
{
if (hWnd == IntPtr.Zero)
hWnd = PInvoke.GetDesktopWindow();
var hdcSrc = PInvoke.GetWindowDC(hWnd);
var windowRect = new RECT();
PInvoke.GetWindowRect(hWnd, ref windowRect);
var width = windowRect.Right - windowRect.Left;
var height = windowRect.Bottom - windowRect.Top;
var bmp = new Bitmap(width, height);
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
bmp.SetPixel(x, y, Utilities.GetColorFromABGR(PInvoke.GetPixel(hdcSrc, x, y)));
}
return bmp;
}
