public void Start(int framesPerSecond)
{
string filename;
if (recordingWindow != null) {
string windowTitle = Regex.Replace(recordingWindow.Text, @"[^\x20\d\w]", "");
if (string.IsNullOrEmpty(windowTitle)) {
windowTitle = "greenshot-recording";
}
filename = Path.Combine(conf.OutputFilePath, windowTitle + ".avi");
} else {
filename = Path.Combine(conf.OutputFilePath, "greenshot-recording.avi");
}
if (File.Exists(filename)) {
try {
File.Delete(filename);
} catch {}
}
LOG.InfoFormat("Capturing to {0}", filename);
if (recordingWindow != null) {
LOG.InfoFormat("Starting recording Window '{0}', {1}", recordingWindow.Text, recordingWindow.ClientRectangle);
recordingSize = recordingWindow.ClientRectangle.Size;
} else {
LOG.InfoFormat("Starting recording rectangle {0}", recordingRectangle);
recordingSize = recordingRectangle.Size;
}
if (recordingSize.Width % 8 > 0) {
LOG.InfoFormat("Correcting width to be factor 8, {0} => {1}", recordingSize.Width, recordingSize.Width + (8-(recordingSize.Width % 8)));
recordingSize = new Size(recordingSize.Width + (8-(recordingSize.Width % 8)), recordingSize.Height);
}
if (recordingSize.Height % 8 > 0) {
LOG.InfoFormat("Correcting Height to be factor 8, {0} => {1}", recordingSize.Height, recordingSize.Height + (8-(recordingSize.Height % 8)));
recordingSize = new Size(recordingSize.Width, recordingSize.Height + (8-(recordingSize.Height % 8)));
}
this.framesPerSecond = framesPerSecond;
// "P/Invoke" Solution for capturing the screen
hWndDesktop = User32.GetDesktopWindow();
// get te hDC of the target window
hDCDesktop = User32.GetWindowDC(hWndDesktop);
// Make sure the last error is set to 0
Win32.SetLastError(0);
// create a device context we can copy to
hDCDest = GDI32.CreateCompatibleDC(hDCDesktop);
// Check if the device context is there, if not throw an error with as much info as possible!
if (hDCDest == IntPtr.Zero) {
// Get Exception before the error is lost
Exception exceptionToThrow = CreateCaptureException("CreateCompatibleDC", recordingSize);
// Cleanup
User32.ReleaseDC(hWndDesktop, hDCDesktop);
// throw exception
throw exceptionToThrow;
}
// Create BitmapInfoHeader for CreateDIBSection
BitmapInfoHeader bitmapInfoHeader = new BitmapInfoHeader(recordingSize.Width, recordingSize.Height, 32);
// Make sure the last error is set to 0
Win32.SetLastError(0);
// create a bitmap we can copy it to, using GetDeviceCaps to get the width/height
hDIBSection = GDI32.CreateDIBSection(hDCDesktop, ref bitmapInfoHeader, BitmapInfoHeader.DIB_RGB_COLORS, out bits0, IntPtr.Zero, 0);
if (hDIBSection == IntPtr.Zero) {
// Get Exception before the error is lost
Exception exceptionToThrow = CreateCaptureException("CreateDIBSection", recordingSize);
exceptionToThrow.Data.Add("hdcDest", hDCDest.ToInt32());
exceptionToThrow.Data.Add("hdcSrc", hDCDesktop.ToInt32());
// clean up
GDI32.DeleteDC(hDCDest);
User32.ReleaseDC(hWndDesktop, hDCDesktop);
// Throw so people can report the problem
throw exceptionToThrow;
}
// Create a GDI Bitmap so we can use GDI and GDI+ operations on the same memory
GDIBitmap = new Bitmap(recordingSize.Width, recordingSize.Height, 32, PixelFormat.Format32bppArgb, bits0);
// select the bitmap object and store the old handle
hOldObject = GDI32.SelectObject(hDCDest, hDIBSection);
stop = false;
aviWriter = new AVIWriter();
// Comment the following 2 lines to make the user select it's own codec
//aviWriter.Codec = "msvc";
//aviWriter.Quality = 99;
aviWriter.FrameRate = framesPerSecond;
aviWriter.Open(filename, recordingSize.Width, recordingSize.Height);
// Start update check in the background
backgroundTask = new Thread (new ThreadStart(CaptureFrame));
backgroundTask.IsBackground = true;
backgroundTask.Start();
}
/// <summary>
/// This method will use User32 code to capture the specified captureBounds from the screen
/// </summary>
/// <param name="captureBounds">Rectangle with the bounds to capture</param>
/// <returns>Bitmap which is captured from the screen at the location specified by the captureBounds</returns>
public static Bitmap CaptureRectangle(Rectangle captureBounds)
{
Bitmap returnBitmap = null;
if (captureBounds.Height <= 0 || captureBounds.Width <= 0)
{
LOG.Warn("Nothing to capture, ignoring!");
return null;
}
else
{
LOG.Debug("CaptureRectangle Called!");
}
// .NET GDI+ Solution, according to some post this has a GDI+ leak...
// See http://connect.microsoft.com/VisualStudio/feedback/details/344752/gdi-object-leak-when-calling-graphics-copyfromscreen
// Bitmap capturedBitmap = new Bitmap(captureBounds.Width, captureBounds.Height);
// using (Graphics graphics = Graphics.FromImage(capturedBitmap)) {
// graphics.CopyFromScreen(captureBounds.Location, Point.Empty, captureBounds.Size, CopyPixelOperation.CaptureBlt);
// }
// capture.Image = capturedBitmap;
// capture.Location = captureBounds.Location;
using (SafeWindowDCHandle desktopDCHandle = SafeWindowDCHandle.fromDesktop())
{
if (desktopDCHandle.IsInvalid)
{
// Get Exception before the error is lost
Exception exceptionToThrow = CreateCaptureException("desktopDCHandle", captureBounds);
// throw exception
throw exceptionToThrow;
}
// create a device context we can copy to
using (SafeCompatibleDCHandle safeCompatibleDCHandle = GDI32.CreateCompatibleDC(desktopDCHandle))
{
// Check if the device context is there, if not throw an error with as much info as possible!
if (safeCompatibleDCHandle.IsInvalid)
{
// Get Exception before the error is lost
Exception exceptionToThrow = CreateCaptureException("CreateCompatibleDC", captureBounds);
// throw exception
throw exceptionToThrow;
}
// Create BitmapInfoHeader for CreateDIBSection
BitmapInfoHeader bmi = new BitmapInfoHeader(captureBounds.Width, captureBounds.Height, 24);
// Make sure the last error is set to 0
Win32.SetLastError(0);
// create a bitmap we can copy it to, using GetDeviceCaps to get the width/height
IntPtr bits0; // not used for our purposes. It returns a pointer to the raw bits that make up the bitmap.
using (SafeDibSectionHandle safeDibSectionHandle = GDI32.CreateDIBSection(desktopDCHandle, ref bmi, BitmapInfoHeader.DIB_RGB_COLORS, out bits0, IntPtr.Zero, 0))
{
if (safeDibSectionHandle.IsInvalid)
{
// Get Exception before the error is lost
Exception exceptionToThrow = CreateCaptureException("CreateDIBSection", captureBounds);
exceptionToThrow.Data.Add("hdcDest", safeCompatibleDCHandle.DangerousGetHandle().ToInt32());
exceptionToThrow.Data.Add("hdcSrc", desktopDCHandle.DangerousGetHandle().ToInt32());
// Throw so people can report the problem
throw exceptionToThrow;
}
else
{
// select the bitmap object and store the old handle
using (SafeSelectObjectHandle selectObject = safeCompatibleDCHandle.SelectObject(safeDibSectionHandle))
{
// bitblt over (make copy)
GDI32.BitBlt(safeCompatibleDCHandle, 0, 0, captureBounds.Width, captureBounds.Height, desktopDCHandle, captureBounds.X, captureBounds.Y, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt);
}
// get a .NET image object for it
// A suggestion for the "A generic error occurred in GDI+." E_FAIL/0×80004005 error is to re-try...
bool success = false;
ExternalException exception = null;
for (int i = 0; i < 3; i++)
{
try
{
// Collect all screens inside this capture
List<Screen> screensInsideCapture = new List<Screen>();
foreach (Screen screen in Screen.AllScreens)
{
if (screen.Bounds.IntersectsWith(captureBounds))
{
screensInsideCapture.Add(screen);
}
}
// Check all all screens are of an equal size
bool offscreenContent = false;
using (Region captureRegion = new Region(captureBounds))
{
// Exclude every visible part
foreach (Screen screen in screensInsideCapture)
{
captureRegion.Exclude(screen.Bounds);
}
// If the region is not empty, we have "offscreenContent"
using (Graphics screenGraphics = Graphics.FromHwnd(User32.GetDesktopWindow()))
{
offscreenContent = !captureRegion.IsEmpty(screenGraphics);
}
}
// Check if we need to have a transparent background, needed for offscreen content
if (offscreenContent)
{
using (Bitmap tmpBitmap = Bitmap.FromHbitmap(safeDibSectionHandle.DangerousGetHandle()))
{
// Create a new bitmap which has a transparent background
returnBitmap = ImageHelper.CreateEmpty(tmpBitmap.Width, tmpBitmap.Height, PixelFormat.Format32bppArgb, Color.Transparent, tmpBitmap.HorizontalResolution, tmpBitmap.VerticalResolution);
// Content will be copied here
using (Graphics graphics = Graphics.FromImage(returnBitmap))
{
// For all screens copy the content to the new bitmap
foreach (Screen screen in Screen.AllScreens)
{
Rectangle screenBounds = screen.Bounds;
// Make sure the bounds are offsetted to the capture bounds
screenBounds.Offset(-captureBounds.X, -captureBounds.Y);
graphics.DrawImage(tmpBitmap, screenBounds, screenBounds.X, screenBounds.Y, screenBounds.Width, screenBounds.Height, GraphicsUnit.Pixel);
}
}
}
}
else
{
// All screens, which are inside the capture, are of equal size
// assign image to Capture, the image will be disposed there..
returnBitmap = Bitmap.FromHbitmap(safeDibSectionHandle.DangerousGetHandle());
}
// We got through the capture without exception
success = true;
break;
}
catch (ExternalException ee)
{
LOG.Warn("Problem getting bitmap at try " + i + " : ", ee);
exception = ee;
}
}
if (!success)
{
LOG.Error("Still couldn't create Bitmap!");
throw exception;
}
}
}
}
}
return returnBitmap;
}
/// <summary>
/// This method will use User32 code to capture the specified captureBounds from the screen
/// </summary>
/// <param name="captureBounds">Rectangle with the bounds to capture</param>
/// <returns>Bitmap which is captured from the screen at the location specified by the captureBounds</returns>
public static Bitmap CaptureRectangle(Rectangle captureBounds)
{
Bitmap returnBitmap = null;
if (captureBounds.Height <= 0 || captureBounds.Width <= 0) {
LOG.Warn("Nothing to capture, ignoring!");
return null;
} else {
LOG.Debug("CaptureRectangle Called!");
}
// .NET GDI+ Solution, according to some post this has a GDI+ leak...
// See http://connect.microsoft.com/VisualStudio/feedback/details/344752/gdi-object-leak-when-calling-graphics-copyfromscreen
// Bitmap capturedBitmap = new Bitmap(captureBounds.Width, captureBounds.Height);
// using (Graphics graphics = Graphics.FromImage(capturedBitmap)) {
// graphics.CopyFromScreen(captureBounds.Location, Point.Empty, captureBounds.Size, CopyPixelOperation.CaptureBlt);
// }
// capture.Image = capturedBitmap;
// capture.Location = captureBounds.Location;
// "P/Invoke" Solution for capturing the screen
IntPtr hWndDesktop = User32.GetDesktopWindow();
// get te hDC of the target window
IntPtr hDCDesktop = User32.GetWindowDC(hWndDesktop);
// Make sure the last error is set to 0
Win32.SetLastError(0);
// create a device context we can copy to
IntPtr hDCDest = GDI32.CreateCompatibleDC(hDCDesktop);
// Check if the device context is there, if not throw an error with as much info as possible!
if (hDCDest == IntPtr.Zero) {
// Get Exception before the error is lost
Exception exceptionToThrow = CreateCaptureException("CreateCompatibleDC", captureBounds);
// Cleanup
User32.ReleaseDC(hWndDesktop, hDCDesktop);
// throw exception
throw exceptionToThrow;
}
// Create BitmapInfoHeader for CreateDIBSection
BitmapInfoHeader bmi = new BitmapInfoHeader(captureBounds.Width, captureBounds.Height, 24);
// Make sure the last error is set to 0
Win32.SetLastError(0);
// create a bitmap we can copy it to, using GetDeviceCaps to get the width/height
IntPtr bits0; // not used for our purposes. It returns a pointer to the raw bits that make up the bitmap.
IntPtr hDIBSection = GDI32.CreateDIBSection(hDCDesktop, ref bmi, BitmapInfoHeader.DIB_RGB_COLORS, out bits0, IntPtr.Zero, 0);
if (hDIBSection == IntPtr.Zero) {
// Get Exception before the error is lost
Exception exceptionToThrow = CreateCaptureException("CreateDIBSection", captureBounds);
exceptionToThrow.Data.Add("hdcDest", hDCDest.ToInt32());
exceptionToThrow.Data.Add("hdcSrc", hDCDesktop.ToInt32());
// clean up
GDI32.DeleteDC(hDCDest);
User32.ReleaseDC(hWndDesktop, hDCDesktop);
// Throw so people can report the problem
throw exceptionToThrow;
} else {
// select the bitmap object and store the old handle
IntPtr hOldObject = GDI32.SelectObject(hDCDest, hDIBSection);
// bitblt over (make copy)
GDI32.BitBlt(hDCDest, 0, 0, captureBounds.Width, captureBounds.Height, hDCDesktop, captureBounds.X, captureBounds.Y, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt);
// restore selection (old handle)
GDI32.SelectObject(hDCDest, hOldObject);
// clean up
GDI32.DeleteDC(hDCDest);
User32.ReleaseDC(hWndDesktop, hDCDesktop);
// get a .NET image object for it
// A suggestion for the "A generic error occurred in GDI+." E_FAIL/0×80004005 error is to re-try...
bool success = false;
ExternalException exception = null;
for(int i = 0; i < 3; i++) {
try {
// assign image to Capture, the image will be disposed there..
returnBitmap = Bitmap.FromHbitmap(hDIBSection);
success = true;
break;
} catch (ExternalException ee) {
LOG.Warn("Problem getting bitmap at try " + i + " : ", ee);
exception = ee;
}
}
if (!success) {
LOG.Error("Still couldn't create Bitmap!");
throw exception;
}
// free up the Bitmap object
GDI32.DeleteObject(hDIBSection);
}
return returnBitmap;
}
public static extern SafeDibSectionHandle CreateDIBSection(SafeHandle hdc, ref BitmapInfoHeader bmi, uint Usage, out IntPtr bits, IntPtr hSection, uint dwOffset);
public static extern IntPtr CreateDIBSection(IntPtr hdc, ref BitmapInfoHeader bmi, uint Usage, out IntPtr bits, IntPtr hSection, uint dwOffset);