我有一个代码片段可以在两台显示器上设置单个图像，但我最近为我的笔记本电脑配备了第二台显示器，我想修改我的代码，以便为每台显示器设置不同的图像。
有什么想法吗？
（单个监视器的代码snipet是：
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern Int32 SystemParametersInfo(UInt32 action, UInt32 uParam, String vParam, UInt32 winIni);
private static readonly UInt32 SPI_SETDESKWALLPAPER = 0x14;
private static readonly UInt32 SPIF_UPDATEINIFILE = 0x01;
private static readonly UInt32 SPIF_SENDWININICHANGE = 0x02;
private void SetWallpaper(string path)
{
if (path != null)
{
string savepath = Settings.Default.SavePath;
Image imgInFile = Image.FromFile(path);
imgInFile.Save(savepath, ImageFormat.Bmp);
SystemParametersInfo(SPI_SETDESKWALLPAPER, 3, savepath, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
}
else
{
MessageBox.Show("Path Null");
}
}
）
答案 0 :(得分：2)
好吧，拿别人的答案代码并修改了一下...... 问题是前面的代码假设主要监视器是新图片中最顶层和最左边的创建....它对我没用。 编辑 - ＆gt;我们发现Windows 7和10在平铺图片的起始位置方面表现不同。赢得10开始左上角.... Win 7始终与主监视器一起启动。
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using Microsoft.Win32;
using System.Windows.Forms;
using System.IO;
namespace toolbox.Wallpaper
{
public class CustomWally
{
const int SetDeskWallpaper = 20;
const int UpdateIniFile = 0x01;
const int SendWinIniChange = 0x02;
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);
Point primaryMonitorPoint = new Point(0, 0);
const string defaultBackgroundFile = @"C:\Users\Public\Pictures\Sample Pictures\DefaultBackground.jpg";
Dictionary<string, Image> images = new Dictionary<string, Image>();
public CustomWally()
{
//figure out where the main monitor is in relation to the virtualScreenBitmap
foreach (Screen scr in Screen.AllScreens)
{
images.Add(scr.DeviceName, null);
screenos.Add(scr.DeviceName);
if (scr.Bounds.Left < primaryMonitorPoint.X)
primaryMonitorPoint.X = scr.Bounds.Left;
if (scr.Bounds.Top < primaryMonitorPoint.Y)
primaryMonitorPoint.Y = scr.Bounds.Top;
}
primaryMonitorPoint.X *= -1;
primaryMonitorPoint.Y *= -1;
//Image for multiple screens
images.Add("all", null);
//set Images in Dictionary in case there are previous Images
if (File.Exists(defaultBackgroundFile))
{
using (var old = new Bitmap(defaultBackgroundFile))
{
foreach (Screen scr in Screen.AllScreens)
{
Rectangle rectangle = new Rectangle(primaryMonitorPoint.X + scr.Bounds.Left, primaryMonitorPoint.Y + scr.Bounds.Top, scr.Bounds.Width, scr.Bounds.Height);
if (old.Width >= (rectangle.X + rectangle.Width) &&
old.Height >= (rectangle.Y + rectangle.Height))
images[scr.DeviceName] = (Bitmap)old.Clone(rectangle, old.PixelFormat);
}
}
}
}
List<string> screenos = new List<string>();
int index = 0;
public void setAlternatingWalls(string file)
{
images[screenos[index]] = Image.FromFile(file);
index++;
if (index == screenos.Count)
index = 0;
CreateBackgroundImage(Method.multiple);
GC.Collect();
}
public void setWallforScreen(Screen screen, string file)
{
images[screen.DeviceName] = Image.FromFile(file);
CreateBackgroundImage(Method.multiple);
GC.Collect();
}
public void setWallforAllScreen(string file)
{
images["all"] = Image.FromFile(file);
CreateBackgroundImage(Method.single);
GC.Collect();
}
private enum Method
{
multiple,
single
}
private void CreateBackgroundImage(Method method)
{
using (var virtualScreenBitmap = new Bitmap((int)System.Windows.Forms.SystemInformation.VirtualScreen.Width, (int)System.Windows.Forms.SystemInformation.VirtualScreen.Height))
{
using (var virtualScreenGraphic = Graphics.FromImage(virtualScreenBitmap))
{
switch (method)
{
// alternated Screen Images
case Method.multiple:
foreach (var screen in System.Windows.Forms.Screen.AllScreens)
{
// gets the image which we want to place in virtualScreenGraphic
var image = (images.ContainsKey(screen.DeviceName)) ? images[screen.DeviceName] : null;
//sets the position and size where the images will go
Rectangle rectangle = new Rectangle(primaryMonitorPoint.X + screen.Bounds.Left, primaryMonitorPoint.Y + screen.Bounds.Top, screen.Bounds.Width, screen.Bounds.Height);
// produce a image for the screen and fill it with the desired image... centered
var monitorBitmap = new Bitmap(rectangle.Width, rectangle.Height);
if (image != null)
DrawImageCentered(Graphics.FromImage(monitorBitmap), image, rectangle);
//draws the picture at the right place in virtualScreenGraphic
virtualScreenGraphic.DrawImage(monitorBitmap, rectangle);
}
break;
//Single screen Image
case Method.single:
// gets the image which we want to place in virtualScreenGraphic
var image2 = images["all"];
//sets the position and size where the images will go
Rectangle rectangle2 = new Rectangle(0, 0, virtualScreenBitmap.Width, virtualScreenBitmap.Height);
// fill with the desired image... centered
if (image2 != null)
DrawImageCentered(virtualScreenGraphic, image2, rectangle2);
//draws the picture at the right place in virtualScreenGraphic
virtualScreenGraphic.DrawImage(virtualScreenBitmap, rectangle2);
break;
}
virtualScreenBitmap.Save(defaultBackgroundFile, ImageFormat.Jpeg);
}
}
RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true);
key.SetValue(@"WallpaperStyle", 0.ToString());
key.SetValue(@"TileWallpaper", 1.ToString());
SystemParametersInfo(SetDeskWallpaper, 0, defaultBackgroundFile, UpdateIniFile | SendWinIniChange);
}
private void DrawImageCentered(Graphics g, Image img, Rectangle monitorRect)
{
double ratiodev = (1.0 * monitorRect.Width / monitorRect.Height) - (1.0 * img.Width / img.Height);
if (((1.0 * monitorRect.Width / monitorRect.Height > 1) && ratiodev > -0.25 && ratiodev < 0.25))
{
img = getsnappedIMG(img, monitorRect);
}
float heightRatio = (float)monitorRect.Height / (float)img.Height;
float widthRatio = (float)monitorRect.Width / (float)img.Width;
int height = monitorRect.Height;
int width = monitorRect.Width;
int x = 0;
int y = 0;
if (heightRatio < widthRatio)
{
width = (int)((float)img.Width * heightRatio);
height = (int)((float)img.Height * heightRatio);
x = (int)((float)(monitorRect.Width - width) / 2f);
}
else
{
width = (int)((float)img.Width * widthRatio);
height = (int)((float)img.Height * widthRatio);
y = (int)((float)(monitorRect.Height - height) / 2f);
}
Rectangle rect = new Rectangle(x, y, width, height);
g.DrawImage(img, rect);
}
private Image getsnappedIMG(Image img, Rectangle monitorRect)
{
double ratiodev = (1.0 * monitorRect.Width / monitorRect.Height) - (1.0 * img.Width / img.Height);
int height = img.Height;
int width = img.Width;
Rectangle rect;
if (ratiodev < 0)
{
rect = new Rectangle(0, 0, (int)((1.0 * monitorRect.Width / monitorRect.Height) * height), height);
rect.X = (width - rect.Width) / 2;
}
else
{
rect = new Rectangle(0, 0, width, (int)(1.0 * width / (1.0 * monitorRect.Width / monitorRect.Height)));
rect.Y = (height - rect.Height) / 2;
}
var img2 = (Bitmap)img;
return (Bitmap)img2.Clone(rect, img.PixelFormat);
}
}
}
答案 1 :(得分：1)
答案 2 :(得分：1)
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
namespace SetWallpapers
{
internal class Program
{
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern Int32 SystemParametersInfo(UInt32 uiAction, UInt32 uiParam, String pvParam, UInt32 fWinIni);
private static UInt32 SPI_SETDESKWALLPAPER = 20;
private static UInt32 SPIF_UPDATEINIFILE = 0x1;
public void SetImage(string filename)
{
SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, filename, SPIF_UPDATEINIFILE);
}
private static void Main(string[] args)
{
var images = new Dictionary<string, Image>
{
{ @"\\.\DISPLAY1", Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\Lighthouse.jpg") },
{ @"\\.\DISPLAY2", Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\Jellyfish.jpg") },
{ @"\\.\DISPLAY3", Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\Koala.jpg") }
};
CreateBackgroundImage(images);
}
private static void CreateBackgroundImage(Dictionary<string, Image> imageFiles)
{
const string defaultBackgroundFile = @"C:\Users\Public\Pictures\Sample Pictures\DefaultBackground.bmp";
using (var virtualScreenBitmap = new Bitmap((int)System.Windows.SystemParameters.VirtualScreenWidth, (int)System.Windows.SystemParameters.VirtualScreenHeight))
{
using (var virtualScreenGraphic = Graphics.FromImage(virtualScreenBitmap))
{
foreach (var screen in System.Windows.Forms.Screen.AllScreens)
{
var image = (imageFiles.ContainsKey(screen.DeviceName)) ? imageFiles[screen.DeviceName] : null;
var monitorDimensions = screen.Bounds;
var width = monitorDimensions.Width;
var monitorBitmap = new Bitmap(width, monitorDimensions.Height);
var fromImage = Graphics.FromImage(monitorBitmap);
fromImage.FillRectangle(SystemBrushes.Desktop, 0, 0, monitorBitmap.Width, monitorBitmap.Height);
if (image != null)
DrawImageCentered(fromImage, image, new Rectangle(0, 0, monitorBitmap.Width, monitorBitmap.Height));
Rectangle rectangle;
if (monitorDimensions.Top == 0 && monitorDimensions.Left == 0)
{
rectangle = monitorDimensions;
}
else
{
if ((monitorDimensions.Left < 0 && monitorDimensions.Width > -monitorDimensions.Left) ||
(monitorDimensions.Top < 0 && monitorDimensions.Height > -monitorDimensions.Top))
{
var isMain = (monitorDimensions.Top < 0 && monitorDimensions.Bottom > 0);
var left = (monitorDimensions.Left < 0)
? (int) System.Windows.SystemParameters.VirtualScreenWidth + monitorDimensions.Left
: monitorDimensions.Left;
var top = (monitorDimensions.Top < 0)
? (int) System.Windows.SystemParameters.VirtualScreenHeight + monitorDimensions.Top
: monitorDimensions.Top;
Rectangle srcRect;
if (isMain)
{
rectangle = new Rectangle(left, 0, monitorDimensions.Width, monitorDimensions.Bottom);
srcRect = new Rectangle(0, -monitorDimensions.Top, monitorDimensions.Width, monitorDimensions.Height + monitorDimensions.Top);
}
else
{
rectangle = new Rectangle(0, top, monitorDimensions.Right, monitorDimensions.Height);
srcRect = new Rectangle(-monitorDimensions.Left, 0, monitorDimensions.Width + monitorDimensions.Left,
monitorDimensions.Height);
}
virtualScreenGraphic.DrawImage(monitorBitmap, rectangle, srcRect, GraphicsUnit.Pixel);
rectangle = new Rectangle(left, top, monitorDimensions.Width, monitorDimensions.Height);
}
else
{
var left = (monitorDimensions.Left < 0)
? (int) System.Windows.SystemParameters.VirtualScreenWidth + monitorDimensions.Left
: monitorDimensions.Left;
var top = (monitorDimensions.Top < 0)
? (int) System.Windows.SystemParameters.VirtualScreenHeight + monitorDimensions.Top
: monitorDimensions.Top;
rectangle = new Rectangle(left, top, monitorDimensions.Width, monitorDimensions.Height);
}
}
virtualScreenGraphic.DrawImage(monitorBitmap, rectangle);
}
virtualScreenBitmap.Save(defaultBackgroundFile, ImageFormat.Bmp);
}
}
SystemParametersInfo(SPI_SETDESKWALLPAPER, 0u, defaultBackgroundFile, SPIF_UPDATEINIFILE);
}
private static void DrawImageCentered(Graphics g, Image img, Rectangle monitorRect)
{
float heightRatio = (float)monitorRect.Height / (float)img.Height;
float widthRatio = (float)monitorRect.Width / (float)img.Width;
int height = monitorRect.Height;
int width = monitorRect.Width;
int x = 0;
int y = 0;
if (heightRatio > 1f && widthRatio > 1f)
{
height = img.Height;
width = img.Width;
x = (int)((float)(monitorRect.Width - width) / 2f);
y = (int)((float)(monitorRect.Height - height) / 2f);
}
else
{
if (heightRatio < widthRatio)
{
width = (int)((float)img.Width * heightRatio);
height = (int)((float)img.Height * heightRatio);
x = (int)((float)(monitorRect.Width - width) / 2f);
}
else
{
width = (int)((float)img.Width * widthRatio);
height = (int)((float)img.Height * widthRatio);
y = (int)((float)(monitorRect.Height - height) / 2f);
}
}
Rectangle rect = new Rectangle(x, y, width, height);
g.DrawImage(img, rect);
}
}
}