public static void CaptureWindow(int posX, int posY, int wWidth, int wHeight)
{
RECT rect;
GetWindowRect(hWnd, out rect);
using (var image = new Bitmap(rect.Right - rect.Left, rect.Bottom - rect.Top))
{
using (var graphics = Graphics.FromImage(image))
{
var hdcBitmap = graphics.GetHdc();
PrintWindow(hWnd, hdcBitmap, 0);
graphics.ReleaseHdc(hdcBitmap);
}
var newImage = new Bitmap(wWidth, wHeight);
int newY = -1;
int newX = -1;
for (int y = posY; y < posY + wHeight; y++)
{
newY++;
for (int x = posX; x < posX + wWidth; x++)
{
newX++;
newImage.SetPixel(newX, newY, image.GetPixel(x, y));
if (newX == wWidth - 1)
{
newX = -1;
}
}
}
image.Save("Example1.jpg");
newImage.Save("Example.jpg");
}
}
Taking the screenshot itself is relatively straightforward. Once the scene has been rendered, the Direct3D device offers a GetRenderTarget function that returns a pointer to a Direct3D surface with the current scene. Using a SurfaceToBitmap function, the RenderTarget can be converted to a Bitmap object, which can then be saved as either a JPEG or PNG to disk. Below is an example of the code involved:
Bitmap screenshot = Funcs.SurfaceToBitmap(device.GetRenderTarget(0));
screenshot.Save(Frame.ToString() + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
screenshot.Dispose();
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