// Arguments
// int width : Desired Width in pixels
// int height : Desired Height in pixels
// int deviceIDIn : DeviceID of the monitor to be changed. DeviceID starts with 0 representing your first
// monitor. For Laptops, the built-in display is usually 0.
static public string ChangeResolution(int width, int height, int deviceIDIn)
{
var d = GetDeviceByNo(deviceIDIn);
DEVMODE dm = GetDevMode();
//Attempt to change settings
if (0 != User_32.EnumDisplaySettingsEx(d.DeviceName, User_32.ENUM_CURRENT_SETTINGS, ref dm, 0))
{
dm.dmPelsWidth = width;
dm.dmPelsHeight = height;
int iRet = User_32.ChangeDisplaySettingsEx(d.DeviceName, ref dm, IntPtr.Zero, ChangeDisplaySettingsFlags.CDS_TEST, IntPtr.Zero);
if (iRet == (int)DISP_CHANGE.FAILED)
{
return("Unable To Process Your Request. Sorry For This Inconvenience.");
}
else
{
iRet = User_32.ChangeDisplaySettingsEx(d.DeviceName, ref dm, IntPtr.Zero, ChangeDisplaySettingsFlags.CDS_UPDATEREGISTRY, IntPtr.Zero);
switch (iRet)
{
case (int)DISP_CHANGE.SUCCESSFUL:
{
return("Success");
}
case (int)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 ChangeDisplaySettingsEx(string lpszDeviceName, ref DEVMODE lpDevMode, IntPtr hwnd, ChangeDisplaySettingsFlags dwflags, IntPtr lParam);
public static extern int EnumDisplaySettingsEx(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode, uint dwFlags);
