// 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 bool EnumDisplayDevices(string lpDevice, uint iDevNum, ref DISPLAY_DEVICE lpDisplayDevice, uint dwFlags);
public static extern bool EnumDisplayDevices(string deviceName, int modeNum, ref DISPLAY_DEVICE dsp, int flags);
static public string ChangeResolution(int width, int height)
{
DEVMODE1 dm = GetDevMode1();
DISPLAY_DEVICE dsp = new DISPLAY_DEVICE();
dsp.cb = Marshal.SizeOf(dsp);
/* for(int i=0; true ; i++) */
/* { */
/* if(!User_32.EnumDisplayDevices(null, i, ref dsp, 0)) */
/* { */
/* break; */
/* } */
/* Console.WriteLine("DISPLAY_DEVICE: \n" + dsp.ToString()); */
/* if(dsp.DeviceString == "Standard VGA Graphics Adapter") */
/* { */
/* break; */
/* } */
/* } */
/* Console.WriteLine("Selected DISPLAY_DEVICE: \n" + dsp.ToString()); */
if (0 != User_32.EnumDisplaySettings(null, User_32.ENUM_CURRENT_SETTINGS, ref dm))
{
dm.dmPelsWidth = width;
dm.dmPelsHeight = height;
int iRet = User_32.ChangeDisplaySettings(ref dm, User_32.CDS_TEST);
if (iRet == User_32.DISP_CHANGE_FAILED)
{
return("Unable To Process Your Request. Sorry For This Inconvenience.");
}
else
{
iRet = User_32.ChangeDisplaySettings(ref dm, User_32.CDS_UPDATEREGISTRY);
switch (iRet)
{
case User_32.DISP_CHANGE_SUCCESSFUL:
{
return("Success");
}
case User_32.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.");
}
}
private static DISPLAY_DEVICE GetDisplayDeviceStruct()
{
DISPLAY_DEVICE dsp = new DISPLAY_DEVICE();
return(dsp);
}