private static void With(short x, short y, short width, short height, Func <COORD, CHAR_INFO, CHAR_INFO> doAction, bool loadFromScreen, bool writeToBuffer = true)
{
if (x + width > System.Console.WindowWidth)
{
width = (short)((System.Console.WindowWidth - 1) - x - 1);
}
IntPtr buffer = IntPtr.Zero;
try
{
var stdHandle = GetConsoleOutputHandle();
buffer = Marshal.AllocHGlobal(width * height * Marshal.SizeOf(typeof(CHAR_INFO)));
SMALL_RECT rect = new SMALL_RECT()
{
Left = x, Top = y, Right = (short)(x + width), Bottom = (short)(y + height)
};
COORD leftTop = new COORD()
{
X = 0, Y = 0
};
COORD size = new COORD()
{
X = (short)(width), Y = height
};
if (loadFromScreen)
{
if (!Native.ReadConsoleOutput(stdHandle.DangerousGetHandle(), buffer, size, leftTop, ref rect))
{
// 'Not enough storage is available to process this command' may be raised for buffer size > 64K (see ReadConsoleOutput doc.)
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
long LongPtr = buffer.ToInt64(); // Must work both on x86 and x64
for (short h = 0; h < height; h++)
{
for (short w = 0; w < width; w++)
{
IntPtr RectPtr = new IntPtr(LongPtr);
CHAR_INFO ci = (CHAR_INFO)Marshal.PtrToStructure(RectPtr, typeof(CHAR_INFO));
ci = doAction(new COORD()
{
X = w, Y = h
}, ci);
//save to safeBuffer
Marshal.StructureToPtr(ci, RectPtr, true); // You do not need to erase struct in this case
LongPtr += Marshal.SizeOf(typeof(CHAR_INFO));
}
}
if (writeToBuffer)
{
Native.WriteConsoleOutput(stdHandle.DangerousGetHandle(), buffer, size, leftTop, ref rect);
}
}
catch (Exception)
{
throw;
}
finally
{
Marshal.FreeHGlobal(buffer);
}
}
public static extern bool WriteConsoleOutput(IntPtr hConsoleOutput, IntPtr lpBuffer, COORD dwBufferSize, COORD dwBufferCoord, ref SMALL_RECT lpWriteRegion);
