public static extern int ChangeDisplaySettingsEx(string lpszDeviceName, ref DEVMODE lpDevMode, IntPtr hwnd, ChangeDisplaySettingsFlags dwflags, IntPtr lParam);
// 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)
{
//Basic Error Check
uint deviceID = 0;
if (deviceIDIn < 0)
{
deviceID = 0;
}
else
{
deviceID = (uint)deviceIDIn;
}
DISPLAY_DEVICE d = new DISPLAY_DEVICE();
d.cb = Marshal.SizeOf(d);
DEVMODE dm = GetDevMode();
User_32.EnumDisplayDevices(null, deviceID, ref d, 1); //Get Device Information
// Print Device Information
Console.WriteLine("DeviceName: {0} \nDeviceString: {1}\nDeviceID: {2}\nDeviceKey {3}\nStateFlags {4}\n", d.DeviceName, d.DeviceString, d.DeviceID, d.DeviceKey, d.StateFlags);
//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 EnumDisplaySettingsEx(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode, uint dwFlags);
