private void SetInputType(IntPtr hMonitor, InputType inputType)
{
// get number of physical displays (assume only one for simplicity)
var success = GetNumberOfPhysicalMonitorsFromHMONITOR(hMonitor, out uint physicalMonitorCount);
var physicalMonitorArray = new Physical_Monitor[physicalMonitorCount]; //count will be 1 for extended displays and 2(or more) for mirrored displays
success = GetPhysicalMonitorsFromHMONITOR(hMonitor, physicalMonitorCount, physicalMonitorArray);
var physicalMonitor = physicalMonitorArray[physicalMonitorArray.Length - 1]; //if count > 1 then we assume the laptop screen is 1st in array and the mirrored monitor is 2nd
success = SetVCPFeature(physicalMonitor.hPhysicalMonitor, INPUT_SELECT, (int)inputType);
success = DestroyPhysicalMonitors(physicalMonitorCount, physicalMonitorArray);
}
private static bool GetPhysicalMonitorsFromHMONITOR(IntPtr hMonitor, out Physical_Monitor[] physicalMonitors)
{
// Allocate unmanaged memory.
uint physicalMonitorCount = 0;
GetNumberOfPhysicalMonitorsFromHMONITOR(hMonitor, out physicalMonitorCount);
int sizeofPhysicalMonitor = Marshal.SizeOf(typeof(Physical_Monitor));
IntPtr pUnmanagedMonitorArray = Marshal.AllocHGlobal(sizeofPhysicalMonitor * (int)physicalMonitorCount);
// Fetch data.
bool fetchSuccess = GetPhysicalMonitorsFromHMONITOR(hMonitor, physicalMonitorCount, pUnmanagedMonitorArray);
// Copy data.
physicalMonitors = new Physical_Monitor[physicalMonitorCount];
if (fetchSuccess)
{
IntPtr pUnmanagedMonitorElement = new IntPtr(pUnmanagedMonitorArray.ToInt64());
for (int i = 0; i < physicalMonitors.Length; ++i)
{
physicalMonitors[i] = (Physical_Monitor)Marshal.PtrToStructure(pUnmanagedMonitorElement, typeof(Physical_Monitor));
pUnmanagedMonitorElement += sizeofPhysicalMonitor;
}
}
// Free unmanaged memory.
Marshal.FreeHGlobal(pUnmanagedMonitorArray);
return fetchSuccess;
}
