/// <summary>
/// Callback for the SetHookEx function
/// </summary>
/// <param name="nCode"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <returns></returns>
public int KeyHook(int nCode, IntPtr wParam, IntPtr lParam)
{
keysChanged = false;
if (nCode < 0)
{
return(Win32Functions.CallNextHookEx(hKeyHook, nCode, wParam, lParam));
}
else
{
int vkCode = Marshal.ReadInt32(lParam);
//handle key up/key down
if (wParam == (IntPtr)Win32Defines.WM_KEYDOWN || wParam == (IntPtr)Win32Defines.WM_SYSKEYDOWN)
{
if (vkCode == Key.VK_CONTROL)
{
ctrlDown = true;
}
else if (vkCode == Key.VK_SNAPSHOT)
{
if (!psDown)
{
psDown = true;
keysChanged = true;
}
}
else if (vkCode == Key.VK_ALT)
{
altDown = true;
}
}
else if (wParam == (IntPtr)Win32Defines.WM_KEYUP || wParam == (IntPtr)Win32Defines.WM_SYSKEYUP)
{
if (vkCode == Key.VK_CONTROL)
{
ctrlDown = false;
}
if (vkCode == Key.VK_SNAPSHOT)
{
psDown = false;
}
if (vkCode == Key.VK_ALT)
{
altDown = false;
}
}
//make sure a key was down to continue...
if ((wParam == (IntPtr)Win32Defines.WM_KEYDOWN || wParam == (IntPtr)Win32Defines.WM_SYSKEYDOWN) && canContinue() &&
vkCode == Key.VK_SNAPSHOT)
{
Image img = null;
if (captureWindow())
{
Win32Functions.RECT windowRect = new Win32Functions.RECT();
//get the top level window!!
IntPtr hWnd = new IntPtr(Win32Functions.GetForegroundWindow());
IntPtr hdcSrc = Win32Functions.GetWindowDC((int)hWnd);
Win32Functions.GetWindowRect((int)hWnd, ref windowRect);
// create a bitmap from the visible clipping bounds of
//the graphics object from the window
int width = windowRect.right - windowRect.left;
int height = windowRect.bottom - windowRect.top;
// create a device context we can copy to
IntPtr hdcDest = Win32Functions.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
IntPtr hBitmap = Win32Functions.CreateCompatibleBitmap(hdcSrc, width, height);
// select the bitmap object
IntPtr hOld = Win32Functions.SelectObject(hdcDest, hBitmap);
// bitblt over
Win32Functions.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, Win32Defines.SRCCOPY);
// restore selection
Win32Functions.SelectObject(hdcDest, hOld);
// clean up
Win32Functions.DeleteDC(hdcDest);
Win32Functions.ReleaseDC(hWnd, hdcSrc);
// get a .NET image object for it
img = Image.FromHbitmap(hBitmap);
// free up the Bitmap object
Win32Functions.DeleteObject(hBitmap);
}
else
{
Win32Functions.RECT windowRect = new Win32Functions.RECT();
//get the top level window!!
IntPtr hWnd = new IntPtr(Win32Functions.GetDesktopWindow());
IntPtr hdcSrc = Win32Functions.GetWindowDC((int)hWnd);
Win32Functions.GetWindowRect((int)hWnd, ref windowRect);
// create a bitmap from the visible clipping bounds of
//the graphics object from the window
int width = windowRect.right - windowRect.left;
int height = windowRect.bottom - windowRect.top;
// create a device context we can copy to
IntPtr hdcDest = Win32Functions.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
IntPtr hBitmap = Win32Functions.CreateCompatibleBitmap(hdcSrc, width, height);
// select the bitmap object
IntPtr hOld = Win32Functions.SelectObject(hdcDest, hBitmap);
// bitblt over
Win32Functions.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, Win32Defines.SRCCOPY);
// restore selection
Win32Functions.SelectObject(hdcDest, hOld);
// clean up
Win32Functions.DeleteDC(hdcDest);
Win32Functions.ReleaseDC(hWnd, hdcSrc);
// get a .NET image object for it
img = Image.FromHbitmap(hBitmap);
// free up the Bitmap object
Win32Functions.DeleteObject(hBitmap);
}
callBack(img);
}
return(Win32Functions.CallNextHookEx(hKeyHook, nCode, wParam, lParam));
}
}