/// <summary>
/// Call this if you want to receive list of currently active monitors.
/// What does "active" mean in our context? It means the monitors that are "enabled"
/// in Desktop properties screen.
/// </summary>
/// <returns>list of active monitors</returns>
public IEnumerable <IDisplay> GetActiveMonitors()
{
var displayDevices = GetDisplayDevices();
// find out resolution parameters for each display device.
foreach (var displayDevice in displayDevices.Where(
x => x.StateFlags.HasFlag(DisplayDeviceStateFlags.AttachedToDesktop)))
{
var mode = new DevMode {
size = (short)Marshal.SizeOf(typeof(DevMode))
};
// -1 means current RESOLUTION for specific display.
// you can enumerate through 0..N to find supported resolutions.
var success = XPWrapper.EnumDisplaySettings(displayDevice.DeviceName, -1, ref mode);
if (!success)
{
continue;
}
var origin = mode.position;
var resolution = mode.resolution;
var refreshRate = mode.displayFrequency;
var rotation = mode.displayOrientation;
var isPrimary = IsPrimaryDisplay(origin);
if (isPrimary && !displayDevice.StateFlags.HasFlag(DisplayDeviceStateFlags.PrimaryDevice))
{
throw new Exception("SEEMS LIKE MSDN DOCUMENT LIED, IF THIS ERROR EVER HAPPENS.");
}
yield return(new XPDisplay(new DisplaySettings(resolution, origin,
rotation.ToScreenRotation(), refreshRate, isPrimary, displayDevice.DeviceName)));
}
}
public override IEnumerable <Display> GetActiveDisplays()
{
var displayDevices = GetDisplayDevices();
// find out resolution parameters for each display device.
foreach (var displayDevice in displayDevices.Where(
x => x.StateFlags.HasFlag(DisplayDeviceStateFlags.AttachedToDesktop)))
{
var mode = new DevMode {
size = (short)Marshal.SizeOf(typeof(DevMode))
};
// -1 means current RESOLUTION for specific display.
// you can enumerate through 0..N to find supported resolutions.
var success = XPWrapper.EnumDisplaySettings(displayDevice.DeviceName, -1, ref mode);
if (!success)
{
continue;
}
var origin = mode.position;
var resolution = mode.resolution;
var refreshRate = mode.displayFrequency;
var rotation = mode.displayOrientation;
yield return(new Display
{
Resolution = resolution,
Origin = origin,
Rotation = rotation.ToScreenRotation(),
RefreshRate = refreshRate,
Name = displayDevice.DeviceName
});
}
}
/// <summary>
/// Gets all possible display devices.
/// </summary>
/// <returns></returns>
private static IEnumerable <DisplayDevice> GetDisplayDevices()
{
var i = 0;
var valid = true;
while (valid)
{
var displayDevice = new DisplayDevice {
cb = Marshal.SizeOf(typeof(DisplayDevice))
};
valid = XPWrapper.EnumDisplayDevices(null, i, ref displayDevice, 0);
if (valid)
{
yield return(displayDevice);
}
++i;
}
}
