public static extern int ChangeDisplaySettings(ref DEVMODE devMode, int flags);
public static string ChangeResolution(bool inverted)
{
DEVMODE dm = GetDevMode();
if (0 != NativeMethods.EnumDisplaySettings(null, NativeMethods.ENUM_CURRENT_SETTINGS, ref dm))
{
// swap width and height
int temp = dm.dmPelsHeight;
dm.dmPelsHeight = dm.dmPelsWidth;
dm.dmPelsWidth = temp;
if (!inverted)
{
// determine new orientation based on the current orientation
switch (dm.dmDisplayOrientation)
{
case NativeMethods.DMDO_DEFAULT:
//dm.dmDisplayOrientation = NativeMethods.DMDO_270;
//2016-10-25/EBP wrap counter clockwise
NativeMethods.SetAutoRotation(false);
dm.dmDisplayOrientation = NativeMethods.DMDO_90;
break;
case NativeMethods.DMDO_90:
NativeMethods.SetAutoRotation(true);
dm.dmDisplayOrientation = NativeMethods.DMDO_DEFAULT;
break;
case NativeMethods.DMDO_270:
NativeMethods.SetAutoRotation(true);
dm.dmDisplayOrientation = NativeMethods.DMDO_180;
break;
case NativeMethods.DMDO_180:
NativeMethods.SetAutoRotation(false);
dm.dmDisplayOrientation = NativeMethods.DMDO_270;
break;
default:
// unknown orientation value
// add exception handling here
break;
}
}
else
{
// determine new orientation based on the current orientation
switch (dm.dmDisplayOrientation)
{
case NativeMethods.DMDO_DEFAULT:
//dm.dmDisplayOrientation = NativeMethods.DMDO_270;
//2016-10-25/EBP wrap counter clockwise
NativeMethods.SetAutoRotation(false);
dm.dmDisplayOrientation = NativeMethods.DMDO_270;
break;
case NativeMethods.DMDO_270:
NativeMethods.SetAutoRotation(true);
dm.dmDisplayOrientation = NativeMethods.DMDO_DEFAULT;
break;
case NativeMethods.DMDO_90:
NativeMethods.SetAutoRotation(true);
dm.dmDisplayOrientation = NativeMethods.DMDO_180;
break;
case NativeMethods.DMDO_180:
NativeMethods.SetAutoRotation(false);
dm.dmDisplayOrientation = NativeMethods.DMDO_90;
break;
default:
// unknown orientation value
// add exception handling here
break;
}
}
int iRet = NativeMethods.ChangeDisplaySettings(ref dm, NativeMethods.CDS_TEST);
if (iRet == NativeMethods.DISP_CHANGE_FAILED)
{
return("Unable To Process Your Request. Sorry For This Inconvenience.");
}
else
{
iRet = NativeMethods.ChangeDisplaySettings(ref dm, NativeMethods.CDS_UPDATEREGISTRY);
switch (iRet)
{
case NativeMethods.DISP_CHANGE_SUCCESSFUL:
{
return("Success");
}
case NativeMethods.DISP_CHANGE_RESTART:
{
return("You Need To Reboot For The Change To Happen.\n If You Feel Any Problem After Rebooting Your Machine\nThen Try To Change Resolution In Safe Mode.");
}
default:
{
return("Failed To Change The Resolution");
}
}
}
}
else
{
return("Failed To Change The Resolution.");
}
}
public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);