/// <summary>Gets the available resolutions for a display device.</summary>
public IEnumerable <Size> GetResolutions(string?deviceName = null)
{
WindowsApi.DEVMODEW mode = new WindowsApi.DEVMODEW();
mode.Init();
uint modeNum = 0;
while (WindowsApi.EnumDisplaySettingsEx(deviceName, modeNum++, ref mode, 0))
{
yield return(new Size((int)mode.dmPelsWidth, (int)mode.dmPelsHeight));
}
}
private static Size Resolution(Size?newSize, string?deviceName = null)
{
WindowsApi.DEVMODEW mode = new WindowsApi.DEVMODEW();
mode.Init();
// When setting, the current display still needs to be retrieved, to pre-fill the mode struct.
WindowsApi.EnumDisplaySettingsEx(deviceName, WindowsApi.ENUM_CURRENT_SETTINGS, ref mode, 0);
Size originalSize = new Size((int)mode.dmPelsWidth, (int)mode.dmPelsHeight);
if (newSize.HasValue)
{
const uint CDS_UPDATEREGISTRY = 1;
mode.dmPelsWidth = (uint)newSize.Value.Width;
mode.dmPelsHeight = (uint)newSize.Value.Height;
WindowsApi.ChangeDisplaySettingsEx(deviceName, ref mode, IntPtr.Zero, CDS_UPDATEREGISTRY, IntPtr.Zero);
}
return(originalSize);
}
