//Switch monitor power
void MonitorSwitch(PHYSICAL_MONITOR monitor, PowerModeEnum mode)
{
if (SetVCPFeature(monitor.hPhysicalMonitor, SVC_FEATURE__POWER_MODE, (uint)mode))
{
Debug.WriteLine("works!");
}
else
{
string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;
Debug.WriteLine(errorMessage);
}
}
//Switch monitor power
void MonitorBrightness(PHYSICAL_MONITOR monitor, uint pctg)
{
if (SetVCPFeature(monitor.hPhysicalMonitor, SVC_FEATURE__Brightness, (uint)pctg))
{
Debug.WriteLine("works!");
}
else
{
string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;
Debug.WriteLine(errorMessage);
}
}
public void Initialize()
{
monitors = new List <Monitor>();
physicalMonitors = new List <PHYSICAL_MONITOR>();
List <(IntPtr monitor, Rect rect)> hMonitors = new List <(IntPtr, Rect)>();
MonitorEnumProc callback = (IntPtr hMonitor, IntPtr hdc, ref Rect prect, int d) =>
{
monitors.Add(new Monitor
{
hMonitor = hMonitor,
rect = prect,
});
return(true);
};
if (EnumDisplayMonitors(IntPtr.Zero, IntPtr.Zero, callback, 0))
{
foreach (var m in monitors)
{
uint mcount = 0;
if (!GetNumberOfPhysicalMonitorsFromHMONITOR(m.hMonitor, ref mcount))
{
throw new Exception("Cannot get monitor count!");
}
PHYSICAL_MONITOR[] physicalMonitors = new PHYSICAL_MONITOR[mcount];
if (!GetPhysicalMonitorsFromHMONITOR(m.hMonitor, mcount, physicalMonitors))
{
throw new Exception("Cannot get phisical monitor handle!");
}
Debug.WriteLine($"PM:{physicalMonitors.Length}) RECT: T:{m.rect.Top}/L:{m.rect.Left}/R:{m.rect.Right}/B:{m.rect.Bottom}");
this.physicalMonitors.AddRange(physicalMonitors);
m.physicalMonitors = physicalMonitors.Select(a => new PhysicalMonitor
{
DeviceName = a.szPhysicalMonitorDescription,
hPhysicalMonitor = a.hPhysicalMonitor
}).ToList();
}
foreach (var p in monitors.SelectMany(a => a.physicalMonitors))
{
uint cv = 0;
// power
if (GetFeatureValue(p.hPhysicalMonitor, SVC_FEATURE__POWER_MODE, ref cv))
{
p.IsPoweredOn = (cv == (uint)PowerModeEnum.PowerOn);
Debug.WriteLine($"{p.hPhysicalMonitor} + {p.DeviceName} + POWER={cv}");
p.IsEnabled = true;
}
else
{
string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;
Debug.WriteLine($"ERROR for {p.DeviceName}: `{errorMessage}`");
}
// BRIG
if (GetFeatureValue(p.hPhysicalMonitor, SVC_FEATURE__BRIGHTNESS, ref cv))
{
p.BrightnessLevel = cv;
Debug.WriteLine($"{p.hPhysicalMonitor} + {p.DeviceName} + BRIGHTNESS={cv}");
}
else
{
string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;
Debug.WriteLine($"ERROR for {p.DeviceName}: `{errorMessage}`");
}
}
}
}
public void TEST()
{
List <(IntPtr ptr, Rect rect, int d)> hMonitors = new List <(IntPtr, Rect, int)>();
MonitorEnumProc callback = (IntPtr hDesktop, IntPtr hdc, ref Rect prect, int d) =>
{
hMonitors.Add((hDesktop, prect, d));
return(true);
};
List <PHYSICAL_MONITOR> monitors = new List <PHYSICAL_MONITOR>();
if (EnumDisplayMonitors(IntPtr.Zero, IntPtr.Zero, callback, 0))
{
foreach (var m in hMonitors)
{
uint mcount = 0;
if (!GetNumberOfPhysicalMonitorsFromHMONITOR(m.ptr, ref mcount))
{
throw new Exception("Cannot get monitor count!");
}
PHYSICAL_MONITOR[] physicalMonitors = new PHYSICAL_MONITOR[mcount];
if (!GetPhysicalMonitorsFromHMONITOR(m.ptr, mcount, physicalMonitors))
{
throw new Exception("Cannot get phisical monitor handle!");
}
Debug.WriteLine($"PM:{physicalMonitors.Length}) RECT: T:{m.rect.top}/L:{m.rect.left}/R:{m.rect.right}/B:{m.rect.bottom} SCALE:{m.d}");
monitors.AddRange(physicalMonitors);
}
for (int i = 0; i < monitors.Count; i++)
{
uint cv = 0, mv = 0;
if (GetVCPFeatureAndVCPFeatureReply(monitors[i].hPhysicalMonitor, SVC_FEATURE__POWER_MODE, IntPtr.Zero, ref cv, ref mv))
{
Debug.WriteLine($"{i}) {monitors[i].hPhysicalMonitor} + {monitors[i].szPhysicalMonitorDescription} + `{cv}/{mv}`");
}
else
{
string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;
Debug.WriteLine($"{i}) ERROR: {errorMessage}");
// TODO: use HighLevel API to set brightness on these monitors
// https://docs.microsoft.com/en-us/windows/win32/api/highlevelmonitorconfigurationapi/nf-highlevelmonitorconfigurationapi-setmonitorbrightness
}
}
// call power
//:: Current value> 1=On / 2=Standby / 3=Suspended / 4=Off / 5=OffByButton
MonitorSwitch(monitors[2], PowerModeEnum.PowerOn); // <<<< OK but doesn't work on laptop screen
//MonitorBrightness(monitors[0], 60); // <<<< OK but doesn't work on laptop screen
PHYSICAL_MONITOR[] toDestroy = monitors.ToArray();
DestroyPhysicalMonitors((uint)toDestroy.Length, ref toDestroy);
}
else
{
//error
}
}
