C#修改屏幕分辨率

using System;
using System.Collections.Generic;
using ponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace 设置屏幕分辨率
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public const uint WM_SYSCOMMAND = 0x0112;
public const uint SC_MONITORPOWER = 0xF170;
[DllImport("user32")]
public static extern IntPtr SendMessage(IntPtr hWnd, uint wMsg, uint wParam, int lParam);

public enum DMDO
{
DEFAULT = 0,
D90 = 1,
D180 = 2,
D270 = 3
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
struct DEVMODE
{
public const int DM_DISPLAYFREQUENCY = 0x400000;
public const int DM_PELSWIDTH = 0x80000;
public const int DM_PELSHEIGHT = 0x100000;
public const int DM_BITSPERPEL = 262144;
private const int CCHDEVICENAME = 32;
private const int CCHFORMNAME = 32;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCHDEVICENAME)]
public string dmDeviceName;
public short dmSpecVersion;
public short dmDriverVersion;
public short dmSize;
public short dmDriverExtra;
public int dmFields;
public int dmPositionX;
public int dmPositionY;
public DMDO dmDisplayOrientation;
public int dmDisplayFixedOutput;
public short dmColor;
public short dmDuplex;
public short dmYResolution;
public short dmTTOption;
public short dmCollate;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCHFORMNAME)]
public string dmFormName;
public short dmLogPixels;
public int dmBitsPerPel;
public int dmPelsWidth;
public int dmPelsHeight;
public int dmDisplayFlags;
public int dmDisplayFrequency;
public int dmICMMethod;
public int dmICMIntent;
public int dmMediaType;
public int dmDitherType;
public int dmReserved1;
public int dmReserved2;
public int dmPanningWidth;
public int dmPanningHeight;
}

[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern int ChangeDisplaySettings([In] ref DEVMODE lpDevMode, int dwFlags);
int dWidth = 0;
int dHeight = 0;
private void GetDis()//获取分辨率
{
Size s = SystemInformation.PrimaryMonitorSize;
dWidth = s.Width;
dHeight = s.Height;
lblDisInfo.Text = dWidth.ToString() + " × " + dHeight.ToString(

) + " 像素";
}

private void Form1_Load(object sender, EventArgs e)
{
GetDis();
ChangeDis(1);
}
private void ChangeDis(int i)//变换分辨率
{
int dValue;
dValue = trackBar1.Value;
if (i == 0)
{
switch (dValue)
{
case 0: dWidth = 800; dHeight = 600; break;
case 1: dWidth = 1024; dHeight = 768; break;
case 2: dWidth = 1152; dHeight = 864; break;
case 3: dWidth = 1280; dHeight = 600; break;
case 4: dWidth = 1280; dHeight = 720; break;
case 5: dWidth = 1280; dHeight = 768; break;
case 6: dWidth = 1280; dHeight = 760; break;
case 7: dWidth = 1280; dHeight = 1024; break;
case 8: dWidth = 1400; dHeight = 1050; break;
case 9: dWidth = 1600; dHeight = 900; break;
case 10: dWidth = 1600; dHeight = 1200; break;
}
lblDisInfo.Text = dWidth.ToString() + " × " + dHeight.ToString() + " 像素";
}
else
{
int dSum = dWidth + dHeight;
switch (dSum)
{
case 1400: trackBar1.Value = 0; break;
case 1792: trackBar1.Value = 1; break;
case 2016: trackBar1.Value = 2; break;
case 1880: trackBar1.Value = 3; break;
case 2000: trackBar1.Value = 4; break;
case 2048: trackBar1.Value = 5; break;
case 2240: trackBar1.Value = 6; break;
case 2304: trackBar1.Value = 7; break;
case 2450: trackBar1.Value = 8; break;
case 2500: trackBar1.Value = 9; break;
case 2800: trackBar1.Value = 10; break;
}
}
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
ChangeDis(0);
}

private void button1_Click(object sender, EventArgs e)
{
long RetVal = 0;
DEVMODE dm = new DEVMODE();
dm.dmSize = (short)Marshal.SizeOf(typeof(DEVMODE));
dm.dmPelsWidth = dWidth;//宽
dm.dmPelsHeight = dHeight;//高
dm.dmDisplayFrequency = 85;//刷新率
dm.dmFields = DEVMODE.DM_PELSWIDTH | DEVMODE.DM_PELSHEIGHT | DEVMODE.DM_DISPLAYFREQUENCY | DEVMODE.DM_BITSPERPEL;
RetVal = ChangeDisplaySettings(ref dm, 0);
}
}
}