static void UnsubscribeFromWindowActivationEvents()
{
if (windowActivationHookHandle == 0)
{
return;
}
int result = Win.UnhookWinEvent(windowActivationHookHandle);
windowActivationHookHandle = 0;
windowActivationDelegate = null;
HandleAnyErrors(result);
}
static void SubscribeToWindowActivationEvents()
{
if (windowActivationHookHandle != 0)
{
return;
}
windowActivationDelegate = WinEventProc;
windowActivationHookHandle = Win.SetWinEventHook(Win.EVENT_SYSTEM_FOREGROUND, Win.EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, windowActivationDelegate, 0, 0, Win.WINEVENT_OUTOFCONTEXT);
HandleAnyErrors(windowActivationHookHandle);
}
public static string GetActiveWindowTitle()
{
const int nChars = 256;
StringBuilder stringBuilder = new StringBuilder(nChars);
IntPtr foregroundWindowHandle = Win.GetForegroundWindow();
if (Win.GetWindowText(foregroundWindowHandle, stringBuilder, Win.GetWindowTextLength(foregroundWindowHandle) + 1) > 0)
{
return(stringBuilder.ToString());
}
return(null);
}
public static void Start()
{
if (StepDiagram != null)
{
throw new Exception("Unable to start twice. Already listening. Call HookEngine.Stop after calling HookEngine.Start");
}
activeWindowHandle = Win.GetActiveWindow();
StepDiagram = new StepDiagram();
cpuUsageCalculator = new CpuUsageCalculator();
currentProcessTimer = new Timer(CheckCpuUsage, null, 100, 100);
HookEvents();
StepDiagram.AddTaskActive(WindowsEvents.GetActiveWindowTitle(), Win.GetForegroundWindow());
}
static ScreenGrab Grab(int left, int top, int width, int height)
{
using (System.Drawing.Bitmap screenBmp = BitBltGrab(left, top, width, height))
{
IntPtr hBitmap = screenBmp.GetHbitmap();
BitmapSource image = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
Win.DeleteObject(hBitmap);
return(new ScreenGrab()
{
Image = image, Time = DateTime.Now, TopLeft = new Point(left, top)
});
}
}
/// <summary>
/// Grabs the specified area of the screen including alpha blended windows on top such as tool tips and menus.
/// IMPORTANT: You must call dispose on the bitmap returned by this function as soon as you are done with it.
/// </summary>
private static System.Drawing.Bitmap BitBltGrab(int left, int top, int width, int height)
{
IntPtr hDesktop = Win.GetDesktopWindow();
IntPtr dcDesktop = Win.GetWindowDC(hDesktop);
IntPtr dcTarget = Win.CreateCompatibleDC(dcDesktop);
IntPtr hTargetBitmap = Win.CreateCompatibleBitmap(dcDesktop, width, height);
IntPtr hOldBitmap = Win.SelectObject(dcTarget, hTargetBitmap);
bool success = Win.BitBlt(dcTarget, 0, 0, width, height, dcDesktop, left, top, System.Drawing.CopyPixelOperation.SourceCopy | System.Drawing.CopyPixelOperation.CaptureBlt);
System.Drawing.Bitmap bitmap = System.Drawing.Bitmap.FromHbitmap(hTargetBitmap);
Win.SelectObject(dcTarget, hOldBitmap);
Win.DeleteObject(hTargetBitmap);
Win.DeleteDC(dcTarget);
Win.ReleaseDC(hDesktop, dcDesktop);
return(bitmap);
}
public System.Drawing.Point GetCaretPosition()
{
Win.GUITHREADINFO guiInfo = new Win.GUITHREADINFO();
guiInfo.cbSize = (uint)Marshal.SizeOf(guiInfo);
if (!Win.GetGUIThreadInfo(0, out guiInfo))
{
return(System.Drawing.Point.Empty);
}
System.Drawing.Point caretPosition = new System.Drawing.Point();
caretPosition.X = (int)guiInfo.rcCaret.Left + 10; // +10 to better center the caret.
caretPosition.Y = (int)guiInfo.rcCaret.Bottom - 10; // -10 to better center the caret.
Win.ClientToScreen(guiInfo.hwndCaret, ref caretPosition);
return(caretPosition);
}
private static void UnsubscribeFromKeyboardEvents()
{
if (keyboardHookHandle == 0) // Already unsubscribed.
{
return;
}
if (keyDownHandler != null || keyUpHandler != null) // We have listeners.
{
return;
}
int result = Win.UnhookWindowsHookEx(keyboardHookHandle);
keyboardHookHandle = 0;
keyboardDelegate = null;
HandleAnyErrors(result);
}
private static void TryUnsubscribeFromMouseEvents()
{
if (mouseHookHandle == 0) // Already unsubscribed.
{
return;
}
if (WeHaveMouseEventListeners)
{
return;
}
int result = Win.UnhookWindowsHookEx(mouseHookHandle);
mouseHookHandle = 0;
mouseDelegate = null;
HandleAnyErrors(result);
}
private static int MouseHookProc(int nCode, int wParam, IntPtr lParam)
{
if (nCode >= 0)
{
MouseLLHookStruct mouseHookStruct = (MouseLLHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseLLHookStruct));
MouseButtons button = MouseButtons.None;
short mouseDelta = 0;
int clickCount = 0;
bool mouseDown = false;
bool mouseUp = false;
switch (wParam)
{
case Win.WM_LBUTTONDOWN:
mouseDown = true;
button = MouseButtons.Left;
clickCount = 1;
break;
case Win.WM_LBUTTONUP:
mouseUp = true;
button = MouseButtons.Left;
clickCount = 1;
break;
case Win.WM_RBUTTONDOWN:
mouseDown = true;
button = MouseButtons.Right;
clickCount = 1;
break;
case Win.WM_MBUTTONDOWN:
mouseDown = true;
button = MouseButtons.Middle;
clickCount = 1;
break;
case Win.WM_MBUTTONUP:
mouseUp = true;
button = MouseButtons.Middle;
clickCount = 1;
break;
case Win.WM_RBUTTONUP:
mouseUp = true;
button = MouseButtons.Right;
clickCount = 1;
break;
case Win.WM_MOUSEWHEEL:
// High-order word of MouseData is the wheel delta.
mouseDelta = (short)((mouseHookStruct.MouseData >> 16) & 0xffff);
break;
// TODO: Handle WM_XBUTTONDOWN, WM_XBUTTONUP, WM_XBUTTONDBLCLK, WM_NCXBUTTONDOWN, WM_NCXBUTTONUP, & WM_NCXBUTTONDBLCLK.
}
Point mousePos = mouseHookStruct.Point;
MouseEventArgs e = new MouseEventArgs(button, clickCount, mousePos.X, mousePos.Y, mouseDelta);
if (mouseUpHandler != null && mouseUp)
{
mouseUpHandler.Invoke(null, e);
}
if (mouseDownHandler != null && mouseDown)
{
mouseDownHandler.Invoke(null, e);
}
if (mouseWheelHandler != null && mouseDelta != 0)
{
mouseWheelHandler.Invoke(null, e);
}
if (mouseMoveHandler != null && !previousMousePos.Equals(mousePos))
{
previousMousePos = mousePos;
if (mouseMoveHandler != null)
{
mouseMoveHandler.Invoke(null, e);
}
}
}
return(Win.CallNextHookEx(mouseHookHandle, nCode, wParam, lParam));
}