public override Bitmap CaptureScreenArea(int X, int Y, int Width, int Height)
{
IntPtr hdcSrc = GDI32.CreateDC("DISPLAY", null, null, IntPtr.Zero);
IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);
IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc, Width, Height);
GDI32.SelectObject(hdcDest, hBitmap);
GDI32.BitBlt(hdcDest, 0, 0, Width, Height, hdcSrc, User32.ScreenOffsetX + X, User32.ScreenOffsetY + Y,
0x40000000 | 0x00CC0020); //SRCCOPY AND CAPTUREBLT
Bitmap bmpret = Bitmap.FromHbitmap(hBitmap);
GDI32.DeleteDC(hdcSrc);
GDI32.DeleteDC(hdcDest);
GDI32.DeleteObject(hBitmap);
return(bmpret);
}
internal Screen(IntPtr monitor, IntPtr hdc)
{
currentDesktopChangedCount = -1;
workingArea = Rectangle.Empty;
IntPtr screenDC = hdc;
if (!multiMonitorSupport || monitor == (IntPtr)PRIMARY_MONITOR)
{
// Single monitor system
//
if (User32.GetSystemMetrics(80) != 0)
{
bounds = new Rectangle(User32.GetSystemMetrics(76),
User32.GetSystemMetrics(77),
User32.GetSystemMetrics(78),
User32.GetSystemMetrics(79));
}
else
{
Size size = new Size(User32.GetSystemMetrics(0), User32.GetSystemMetrics(1));
bounds = new Rectangle(0, 0, size.Width, size.Height);
}
//bounds = SystemInformation.VirtualScreen;
primary = true;
deviceName = "DISPLAY";
}
else
{
// MultiMonitor System
// We call the 'A' version of GetMonitorInfoA() because
// the 'W' version just never fills out the struct properly on Win2K.
//
var info = new User32.MonitorInfoEx();
info.Init();
User32.GetMonitorInfo(monitor, ref info);
bounds = Rectangle.FromLTRB(info.Monitor.Left, info.Monitor.Top, info.Monitor.Right, info.Monitor.Bottom);
primary = ((info.Flags & MONITORINFOF_PRIMARY) != 0);
/*int count = info.DeviceName.Length;
* while (count > 0 && info.DeviceName[count - 1] == (char)0) {
* count--;
* }
*
* deviceName = new string(info.szDevice);
* deviceName = deviceName.TrimEnd((char)0);*/
deviceName = info.DeviceName;
if (hdc == IntPtr.Zero)
{
screenDC = GDI32.CreateDC(deviceName, null, null, new HandleRef());
}
}
hmonitor = monitor;
this.bitDepth = GDI32.GetDeviceCaps(new HandleRef(null, screenDC).Handle, 12);
this.bitDepth *= GDI32.GetDeviceCaps(new HandleRef(null, screenDC).Handle, 14);
if (hdc != screenDC)
{
GDI32.DeleteDC(new HandleRef(null, screenDC).Handle);
}
}
// https://www.codeproject.com/Articles/546006/Screen-Capture-on-Multiple-Monitors
//function to capture screen section
public static Image CaptureScreen(int x, int y, int width, int height)
{
//create DC for the entire virtual screen
IntPtr hdcSrc = GDI32.CreateDC("DISPLAY", null, null, IntPtr.Zero);
IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);
IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc, width, height);
GDI32.SelectObject(hdcDest, hBitmap);
// set the destination area White - a little complicated
Bitmap bmp = new Bitmap(width, height);
Image ii = (Image)bmp;
Graphics gf = Graphics.FromImage(ii);
IntPtr hdc = gf.GetHdc();
//use whiteness flag to make destination screen white
GDI32.BitBlt(hdcDest, 0, 0, width, height, hdc, 0, 0, 0x00FF0062);
gf.Dispose();
ii.Dispose();
bmp.Dispose();
//Now copy the areas from each screen on the destination hbitmap
Screen[] screendata = Screen.AllScreens;
int X, X1, Y, Y1;
for (int i = 0; i < screendata.Length; i++)
{
if (screendata[i].Bounds.X > (x + width) || (screendata[i].Bounds.X +
screendata[i].Bounds.Width) < x || screendata[i].Bounds.Y > (y + height) ||
(screendata[i].Bounds.Y + screendata[i].Bounds.Height) < y) // no common area
{
}
else
{
// something common
if (x < screendata[i].Bounds.X)
{
X = screendata[i].Bounds.X;
}
else
{
X = x;
}
if ((x + width) > (screendata[i].Bounds.X + screendata[i].Bounds.Width))
{
X1 = screendata[i].Bounds.X + screendata[i].Bounds.Width;
}
else
{
X1 = x + width;
}
if (y < screendata[i].Bounds.Y)
{
Y = screendata[i].Bounds.Y;
}
else
{
Y = y;
}
if ((y + height) > (screendata[i].Bounds.Y + screendata[i].Bounds.Height))
{
Y1 = screendata[i].Bounds.Y + screendata[i].Bounds.Height;
}
else
{
Y1 = y + height;
}
// Main API that does memory data transfer
// SRCCOPY AND CAPTUREBLT
GDI32.BitBlt(hdcDest, X - x, Y - y, X1 - X, Y1 - Y, hdcSrc, X, Y, 0x40000000 | 0x00CC0020);
}
}
// send image to clipboard
Image imf = Image.FromHbitmap(new IntPtr((int)hBitmap));
//Clipboard.SetImage(imf);
GDI32.DeleteDC(hdcSrc);
GDI32.DeleteDC(hdcDest);
GDI32.DeleteObject(hBitmap);
return(imf);
}