/// <summary>
/// Opens the currently active screen buffer.
/// </summary>
/// <returns>A new <see cref="ConsoleScreenBuffer" /> instance that references the currently active
/// console screen buffer.</returns>
/// <remarks>This method allocates a new ConsoleScreenBuffer instance. Callers should
/// call Dispose on the returned instance when they're done with it.</remarks>
public static ConsoleScreenBuffer GetActiveScreenBuffer()
{
// CONOUT$ always references the current active screen buffer.
// NOTE: *MUST* specify GENERIC_READ | GENERIC_WRITE. Otherwise
// the console API calls will fail with Win32 error INVALID_HANDLE_VALUE.
// Also must include the file sharing flags or CreateFile will fail.
IntPtr outHandle = WinApi.CreateFile("CONOUT$",
WinApi.GENERIC_READ | WinApi.GENERIC_WRITE,
WinApi.FILE_SHARE_READ | WinApi.FILE_SHARE_WRITE,
null,
WinApi.OPEN_EXISTING,
0,
IntPtr.Zero);
if (outHandle.ToInt32() == WinApi.INVALID_HANDLE_VALUE)
{
throw new IOException("Unable to open CONOUT$", Marshal.GetLastWin32Error());
}
return(new ConsoleScreenBuffer(outHandle)
{
ownsHandle = true
});
}
private static bool IsCharHandle(IntPtr handle)
{
return(WinApi.GetFileType(handle) == WinApi.FILE_TYPE_CHAR);
}