private byte[] GetImage(IntPtr hwnd, TrimMargin trimMargin)
{
var rect = new Native.Rect();
Native.GetWindowRect(hwnd, ref rect);
byte[] bytes = new byte[0];
if (rect.Left == 0 && rect.Top == 0 && rect.Right == 0 && rect.Bottom == 0)
{
return(null);
}
trimMargin ??= new TrimMargin();
var width = rect.Right - rect.Left - trimMargin.Left - trimMargin.Right;
var height = rect.Bottom - rect.Top - trimMargin.Top - trimMargin.Bottom;
if (width < 0 || height < 0)
{
return(null);
}
using (var memoryStream = new MemoryStream())
using (var bitmap = new Bitmap(width, height))
using (var graphic = Graphics.FromImage(bitmap))
{
graphic.CompositingQuality = CompositingQuality.HighSpeed;
graphic.CompositingMode = CompositingMode.SourceCopy;
graphic.CopyFromScreen(rect.Left + trimMargin.Left, rect.Top + trimMargin.Top, 0, 0, bitmap.Size, CopyPixelOperation.SourceCopy);
bitmap.Save(memoryStream, ImageFormat.Jpeg);
bytes = new byte[memoryStream.Length];
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.Read(bytes, 0, bytes.Length);
}
GC.Collect();
GC.WaitForPendingFinalizers();
return(bytes);
}
public Task <byte[]> GetImageAsync(IntPtr hwnd, TrimMargin trimMargin = null) => Task.Run(() => GetImage(hwnd, trimMargin));