///////////////////////////////////////////////////////////////////////////////
// Eventhandler //
///////////////////////////////////////////////////////////////////////////////
#region EVENTS
///////////////////////////////////////////////////////////////////////////////
// Eventhandler for UI, Menu, Buttons, Toolbars etc. //
///////////////////////////////////////////////////////////////////////////////
#region WINDOWSEVENTHANDLER
#endregion //WINDOWSEVENTHANDLER
///////////////////////////////////////////////////////////////////////////////
// Eventhandler for Custom Defined Events //
///////////////////////////////////////////////////////////////////////////////
#region CUSTOMEVENTHANDLER
#endregion //CUSTOMEVENTHANDLER
#endregion //EVENTS
///////////////////////////////////////////////////////////////////////////////
// Methods and Eventhandling for Background tasks //
///////////////////////////////////////////////////////////////////////////////
#region BACKGROUNDWORKER
#endregion //BACKGROUNDWORKER
///////////////////////////////////////////////////////////////////////////////
// Inherited methods //
///////////////////////////////////////////////////////////////////////////////
#region OVERRIDES
#endregion //OVERRIDES
///////////////////////////////////////////////////////////////////////////////
// Methods for doing main class job //
///////////////////////////////////////////////////////////////////////////////
#region METHODS
/// <summary>
/// Applies a color Matrix to a given Image.
/// E.g. transforms image to grayscale.
/// </summary>
/// <param name="currentImage">image to apply color matrix to</param>
/// <param name="colorMatrix">color matrix to apply</param>
/// <returns><strong>True</strong> if succeeded, otherwise <strong>false</strong>.</returns>
private static bool DrawAdjustedImage(Image currentImage, ColorMatrix colorMatrix)
{
Bitmap bmp = new Bitmap(currentImage);
Rectangle rc = new Rectangle(0, 0, currentImage.Width, currentImage.Height);
Graphics graphicsObject = Graphics.FromImage(currentImage);
ImageAttributes imgattr = new ImageAttributes();
try
{
imgattr.SetColorMatrix(colorMatrix);
graphicsObject.DrawImage(
bmp,
rc,
0,
0,
currentImage.Width,
currentImage.Height,
GraphicsUnit.Pixel,
imgattr);
return(true);
}
catch (Exception ex)
{
VGExceptionMethods.HandleException(ex);
return(false);
}
finally
{
imgattr.Dispose();
bmp.Dispose();
graphicsObject.Dispose();
}
}
/// <summary>
/// Captures a screen shot of a specific window of given size,
/// even if it is hidden.
/// </summary>
/// <param name="windowHandle">A <see cref="IntPtr"/> to the window to capture.
/// (In windows forms, this is obtained by the Handle property)</param>
/// <param name="size">The <see cref="Size"/> of the captured image.</param>
/// <returns>An <see cref="Bitmap"/> with the captured window if successful,
/// otherwise null.</returns>
/// <exception cref="ArgumentNullException">Thrown, when size is empty,
/// or width ot height are less than zero.</exception>
public static Bitmap GetWindowImage(IntPtr windowHandle, Size size)
{
if (size.IsEmpty || size.Height < 0 || size.Width < 0)
{
throw new ArgumentException("The window size should not be zero");
}
Bitmap bmp = new Bitmap(size.Width, size.Height);
Graphics g = Graphics.FromImage(bmp);
IntPtr dc = g.GetHdc();
try
{
User32.PrintWindow(windowHandle, dc, 0); // flags:0 means PW_CLIENTONLY
}
catch (Exception ex)
{
VGExceptionMethods.HandleException(ex);
return(null);
}
finally
{
g.ReleaseHdc();
g.Dispose();
}
return(bmp);
}
/// <summary>
/// Saves given image into a file. Filename is requested via <see cref="SaveFileDialog"/>.
/// </summary>
/// <param name="image">Image to save to disk</param>
/// <returns><strong>True</strong> if succeeded, otherwise <strong>false</strong>.</returns>
public static bool ExportImageToFile(Image image)
{
SaveFileDialog dlg = new SaveFileDialog();
dlg.Title = "Please enter filename for image...";
dlg.InitialDirectory = Environment.SpecialFolder.MyDocuments.ToString();
dlg.Filter = "JPEG Format - jpg|*.jpg|Bitmap Format - bmp|*.bmp|Graphics Interchange Format - gif|*.gif|Portable Networks Graphic - png|*.png|Tag Image File Format - tif|*.tif|Windows MetaFile Format - wmf|*.wmf";
dlg.FileName = "*.jpg";
dlg.AddExtension = true;
if (dlg.ShowDialog() == DialogResult.OK)
{
ImageFormat format;
switch (dlg.FilterIndex)
{
case 1:
format = ImageFormat.Jpeg;
break;
case 2:
format = ImageFormat.Bmp;
break;
case 3:
format = ImageFormat.Gif;
break;
case 4:
format = ImageFormat.Png;
break;
case 5:
format = ImageFormat.Tiff;
break;
case 6:
format = ImageFormat.Wmf;
break;
default:
format = ImageFormat.Jpeg;
break;
}
try
{
image.Save(dlg.FileName, format);
}
catch (Exception ex)
{
VGExceptionMethods.HandleException(ex);
return(false);
}
}
return(true);
}
/// <summary>
/// Creates an Image object containing a screen shot of a specific window
/// </summary>
/// <param name="handle">A <see cref="IntPtr"/> to the window to capture.
/// (In windows forms, this is obtained by the Handle property)</param>
/// <returns>An <see cref="Image"/> with the captured window if successfull,
/// otherwise null.</returns>
/// <remarks>This method uses the GDI32.BitBlt()
/// method, so the window has to be visible and should not be
/// minimized or hidden for example. In this cases use
/// <see cref="GetWindowImage(IntPtr,Size)"/> which uses
/// User32.PrintWindow().
/// </remarks>
public static Image CaptureWindow(IntPtr handle)
{
IntPtr hdcSrc = IntPtr.Zero;
IntPtr hdcDest = IntPtr.Zero;
IntPtr bitmap = IntPtr.Zero;
Image img;
try
{
// get te hDC of the target window
hdcSrc = User32.GetWindowDC(handle);
// get the size
User32.RECT windowRect = new User32.RECT();
User32.GetWindowRect(handle, ref windowRect);
int width = windowRect.Right - windowRect.Left;
int height = windowRect.Bottom - windowRect.Top;
// create a device context we can copy to
hdcDest = Gdi32.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
bitmap = Gdi32.CreateCompatibleBitmap(hdcSrc, width, height);
// select the bitmap object
IntPtr old = Gdi32.SelectObject(hdcDest, bitmap);
// bitblt over
Gdi32.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, Gdi32.TernaryRasterOperations.SRCCOPY);
// restore selection
Gdi32.SelectObject(hdcDest, old);
// get a .NET image object for it
img = Image.FromHbitmap(bitmap);
}
catch (Exception ex)
{
VGExceptionMethods.HandleException(ex);
return(null);
}
finally
{
// clean up
Gdi32.DeleteDC(hdcDest);
User32.ReleaseDC(handle, hdcSrc);
// free up the Bitmap object
Gdi32.DeleteObject(bitmap);
}
return(img);
}