/// <summary>
/// Get's a region of the client area of a given window handle.
/// </summary>
public static Bitmap GetWindowImage(IntPtr hwnd, int x, int y, int width, int height)
{
//Variable to keep the handle to bitmap.
IntPtr hBitmap;
//Here the passed handle to the window and pass it to the varaible used for this function
IntPtr hDC = PlatformInvokeUSER32.GetDC(hwnd);
//Here we make a compatible device context in memory for screen
//device context.
IntPtr hMemDC = PlatformInvokeGDI32.CreateCompatibleDC(hDC);
//We create a compatible bitmap of the screen size and using
//the screen device context.
hBitmap = PlatformInvokeGDI32.CreateCompatibleBitmap
(hDC, width, height);
//As hBitmap is IntPtr, we cannot check it against null.
//For this purpose, IntPtr.Zero is used.
if (hBitmap != IntPtr.Zero)
{
//Here we select the compatible bitmap in the memeory device
//context and keep the refrence to the old bitmap.
IntPtr hOld = (IntPtr)PlatformInvokeGDI32.SelectObject
(hMemDC, hBitmap);
//We copy the Bitmap to the memory device context.
PlatformInvokeGDI32.BitBlt(hMemDC, 0, 0, width, height, hDC,
x, y, PlatformInvokeGDI32.SRCCOPY);
//We select the old bitmap back to the memory device context.
PlatformInvokeGDI32.SelectObject(hMemDC, hOld);
//We delete the memory device context.
PlatformInvokeGDI32.DeleteDC(hMemDC);
//We release the screen device context.
PlatformInvokeUSER32.ReleaseDC(PlatformInvokeUSER32.
GetDesktopWindow(), hDC);
//Image is created by Image bitmap handle and stored in
//local variable.
Bitmap bmp = System.Drawing.Image.FromHbitmap(hBitmap);
//Release the memory to avoid memory leaks.
PlatformInvokeGDI32.DeleteObject(hBitmap);
//This statement runs the garbage collector manually.
GC.Collect();
//Return the bitmap
return(bmp);
}
//If hBitmap is null, retun null.
return(null);
}
public static Bitmap GetWindowImage(IntPtr hwnd, int x, int y, int width, int height)
{
IntPtr dC = PlatformInvokeUSER32.GetDC(hwnd);
IntPtr hdc = PlatformInvokeGDI32.CreateCompatibleDC(dC);
IntPtr bmp = PlatformInvokeGDI32.CreateCompatibleBitmap(dC, width, height);
if (bmp != IntPtr.Zero)
{
IntPtr ptr4 = PlatformInvokeGDI32.SelectObject(hdc, bmp);
PlatformInvokeGDI32.BitBlt(hdc, 0, 0, width, height, dC, x, y, 0xcc0020);
PlatformInvokeGDI32.SelectObject(hdc, ptr4);
PlatformInvokeGDI32.DeleteDC(hdc);
PlatformInvokeUSER32.ReleaseDC(PlatformInvokeUSER32.GetDesktopWindow(), dC);
Bitmap bitmap = Image.FromHbitmap(bmp);
PlatformInvokeGDI32.DeleteObject(bmp);
GC.Collect();
return(bitmap);
}
return(null);
}
public static Bitmap GetDesktopImage()
{
SIZE size;
IntPtr dC = PlatformInvokeUSER32.GetDC(PlatformInvokeUSER32.GetDesktopWindow());
IntPtr hdc = PlatformInvokeGDI32.CreateCompatibleDC(dC);
size.cx = PlatformInvokeUSER32.GetSystemMetrics(0);
size.cy = PlatformInvokeUSER32.GetSystemMetrics(1);
IntPtr bmp = PlatformInvokeGDI32.CreateCompatibleBitmap(dC, size.cx, size.cy);
if (bmp != IntPtr.Zero)
{
IntPtr ptr4 = PlatformInvokeGDI32.SelectObject(hdc, bmp);
PlatformInvokeGDI32.BitBlt(hdc, 0, 0, size.cx, size.cy, dC, 0, 0, 0xcc0020);
PlatformInvokeGDI32.SelectObject(hdc, ptr4);
PlatformInvokeGDI32.DeleteDC(hdc);
PlatformInvokeUSER32.ReleaseDC(PlatformInvokeUSER32.GetDesktopWindow(), dC);
Bitmap bitmap = Image.FromHbitmap(bmp);
PlatformInvokeGDI32.DeleteObject(bmp);
GC.Collect();
return(bitmap);
}
return(null);
}
public static Bitmap GetDesktopImage()
{
//In size variable we shall keep the size of the screen.
SIZE size;
//Variable to keep the handle to bitmap.
IntPtr hBitmap;
//Here we get the handle to the desktop device context.
IntPtr hDC = PlatformInvokeUSER32.GetDC
(PlatformInvokeUSER32.GetDesktopWindow());
//Here we make a compatible device context in memory for screen
//device context.
IntPtr hMemDC = PlatformInvokeGDI32.CreateCompatibleDC(hDC);
//We pass SM_CXSCREEN constant to GetSystemMetrics to get the
//X coordinates of the screen.
size.cx = PlatformInvokeUSER32.GetSystemMetrics
(PlatformInvokeUSER32.SM_CXSCREEN);
//We pass SM_CYSCREEN constant to GetSystemMetrics to get the
//Y coordinates of the screen.
size.cy = PlatformInvokeUSER32.GetSystemMetrics
(PlatformInvokeUSER32.SM_CYSCREEN);
//We create a compatible bitmap of the screen size and using
//the screen device context.
hBitmap = PlatformInvokeGDI32.CreateCompatibleBitmap
(hDC, size.cx, size.cy);
//As hBitmap is IntPtr, we cannot check it against null.
//For this purpose, IntPtr.Zero is used.
if (hBitmap != IntPtr.Zero)
{
//Here we select the compatible bitmap in the memeory device
//context and keep the refrence to the old bitmap.
IntPtr hOld = (IntPtr)PlatformInvokeGDI32.SelectObject
(hMemDC, hBitmap);
//We copy the Bitmap to the memory device context.
PlatformInvokeGDI32.BitBlt(hMemDC, 0, 0, size.cx, size.cy, hDC,
0, 0, PlatformInvokeGDI32.SRCCOPY);
//We select the old bitmap back to the memory device context.
PlatformInvokeGDI32.SelectObject(hMemDC, hOld);
//We delete the memory device context.
PlatformInvokeGDI32.DeleteDC(hMemDC);
//We release the screen device context.
PlatformInvokeUSER32.ReleaseDC(PlatformInvokeUSER32.
GetDesktopWindow(), hDC);
//Image is created by Image bitmap handle and stored in
//local variable.
Bitmap bmp = System.Drawing.Image.FromHbitmap(hBitmap);
//Release the memory to avoid memory leaks.
PlatformInvokeGDI32.DeleteObject(hBitmap);
//This statement runs the garbage collector manually.
GC.Collect();
//Return the bitmap
return(bmp);
}
//If hBitmap is null, retun null.
return(null);
}