/// <summary>
/// Capture the supplied Window
/// </summary>
/// <param name="windowToCapture">Window to capture</param>
/// <param name="captureForWindow">The capture to store the details</param>
/// <param name="windowCaptureMode">What WindowCaptureMode to use</param>
/// <returns></returns>
public static ICapture CaptureWindow(WindowDetails windowToCapture, ICapture captureForWindow, WindowCaptureMode windowCaptureMode)
{
if (captureForWindow == null) {
captureForWindow = new Capture();
}
Rectangle windowRectangle = windowToCapture.WindowRectangle;
// When Vista & DWM (Aero) enabled
bool dwmEnabled = DWM.isDWMEnabled();
// get process name to be able to exclude certain processes from certain capture modes
using (Process process = windowToCapture.Process) {
bool isAutoMode = windowCaptureMode == WindowCaptureMode.Auto;
// For WindowCaptureMode.Auto we check:
// 1) Is window IE, use IE Capture
// 2) Is Windows >= Vista & DWM enabled: use DWM
// 3) Otherwise use GDI (Screen might be also okay but might lose content)
if (isAutoMode) {
if (conf.IECapture && IECaptureHelper.IsIEWindow(windowToCapture)) {
try {
ICapture ieCapture = IECaptureHelper.CaptureIE(captureForWindow, windowToCapture);
if (ieCapture != null) {
return ieCapture;
}
} catch (Exception ex) {
LOG.WarnFormat("Problem capturing IE, skipping to normal capture. Exception message was: {0}", ex.Message);
}
}
// Take default screen
windowCaptureMode = WindowCaptureMode.Screen;
// Change to GDI, if allowed
if (!windowToCapture.isMetroApp && WindowCapture.IsGdiAllowed(process)) {
if (!dwmEnabled && isWPF(process)) {
// do not use GDI, as DWM is not enabled and the application uses PresentationFramework.dll -> isWPF
LOG.InfoFormat("Not using GDI for windows of process {0}, as the process uses WPF", process.ProcessName);
} else {
windowCaptureMode = WindowCaptureMode.GDI;
}
}
// Change to DWM, if enabled and allowed
if (dwmEnabled) {
if (windowToCapture.isMetroApp || WindowCapture.IsDwmAllowed(process)) {
windowCaptureMode = WindowCaptureMode.Aero;
}
}
} else if (windowCaptureMode == WindowCaptureMode.Aero || windowCaptureMode == WindowCaptureMode.AeroTransparent) {
if (!dwmEnabled || (!windowToCapture.isMetroApp && !WindowCapture.IsDwmAllowed(process))) {
// Take default screen
windowCaptureMode = WindowCaptureMode.Screen;
// Change to GDI, if allowed
if (WindowCapture.IsGdiAllowed(process)) {
windowCaptureMode = WindowCaptureMode.GDI;
}
}
} else if (windowCaptureMode == WindowCaptureMode.GDI && !WindowCapture.IsGdiAllowed(process)) {
// GDI not allowed, take screen
windowCaptureMode = WindowCaptureMode.Screen;
}
LOG.InfoFormat("Capturing window with mode {0}", windowCaptureMode);
bool captureTaken = false;
windowRectangle.Intersect(captureForWindow.ScreenBounds);
// Try to capture
while (!captureTaken) {
ICapture tmpCapture = null;
switch (windowCaptureMode) {
case WindowCaptureMode.GDI:
if (WindowCapture.IsGdiAllowed(process)) {
if (windowToCapture.Iconic) {
// Restore the window making sure it's visible!
windowToCapture.Restore();
} else {
windowToCapture.ToForeground();
}
tmpCapture = windowToCapture.CaptureGDIWindow(captureForWindow);
if (tmpCapture != null) {
// check if GDI capture any good, by comparing it with the screen content
int blackCountGDI = ImageHelper.CountColor(tmpCapture.Image, Color.Black, false);
int GDIPixels = tmpCapture.Image.Width * tmpCapture.Image.Height;
int blackPercentageGDI = (blackCountGDI * 100) / GDIPixels;
if (blackPercentageGDI >= 1) {
int screenPixels = windowRectangle.Width * windowRectangle.Height;
using (ICapture screenCapture = new Capture()) {
screenCapture.CaptureDetails = captureForWindow.CaptureDetails;
if (WindowCapture.CaptureRectangleFromDesktopScreen(screenCapture, windowRectangle) != null) {
int blackCountScreen = ImageHelper.CountColor(screenCapture.Image, Color.Black, false);
int blackPercentageScreen = (blackCountScreen * 100) / screenPixels;
if (screenPixels == GDIPixels) {
// "easy compare", both have the same size
// If GDI has more black, use the screen capture.
if (blackPercentageGDI > blackPercentageScreen) {
LOG.Debug("Using screen capture, as GDI had additional black.");
// changeing the image will automatically dispose the previous
tmpCapture.Image = screenCapture.Image;
// Make sure it's not disposed, else the picture is gone!
screenCapture.NullImage();
}
} else if (screenPixels < GDIPixels) {
// Screen capture is cropped, window is outside of screen
if (blackPercentageGDI > 50 && blackPercentageGDI > blackPercentageScreen) {
LOG.Debug("Using screen capture, as GDI had additional black.");
// changeing the image will automatically dispose the previous
tmpCapture.Image = screenCapture.Image;
// Make sure it's not disposed, else the picture is gone!
screenCapture.NullImage();
}
} else {
// Use the GDI capture by doing nothing
LOG.Debug("This should not happen, how can there be more screen as GDI pixels?");
}
}
}
}
}
}
if (tmpCapture != null) {
captureForWindow = tmpCapture;
captureTaken = true;
} else {
// A problem, try Screen
windowCaptureMode = WindowCaptureMode.Screen;
}
break;
case WindowCaptureMode.Aero:
case WindowCaptureMode.AeroTransparent:
if (windowToCapture.isMetroApp || WindowCapture.IsDwmAllowed(process)) {
tmpCapture = windowToCapture.CaptureDWMWindow(captureForWindow, windowCaptureMode, isAutoMode);
}
if (tmpCapture != null) {
captureForWindow = tmpCapture;
captureTaken = true;
} else {
// A problem, try GDI
windowCaptureMode = WindowCaptureMode.GDI;
}
break;
default:
// Screen capture
if (windowToCapture.Iconic) {
// Restore the window making sure it's visible!
windowToCapture.Restore();
} else {
windowToCapture.ToForeground();
}
try {
captureForWindow = WindowCapture.CaptureRectangleFromDesktopScreen(captureForWindow, windowRectangle);
captureTaken = true;
} catch (Exception e) {
LOG.Error("Problem capturing", e);
return null;
}
break;
}
}
}
if (captureForWindow != null) {
if (windowToCapture != null) {
captureForWindow.CaptureDetails.Title = windowToCapture.Text;
}
}
return captureForWindow;
}
