我有一个代码段,可以在两台显示器上设置单个图像,但是最近我的笔记本电脑有了第二台显示器,我想修改代码以解决为每台显示器设置不同图像的问题.
有任何想法吗？
(此单个监视器的代码片段为：
[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");
}
}
)
解决方法:
好吧,让其他人回答了代码并做了一些修改.
问题在于先前的代码假定主监视器在要创建的新图片中位于最顶部和最左侧….它对我没有用.
编辑->指出Windows 7和Windows 10在平铺图片的开始位置方面表现有所不同. Win 10从左上方开始….Win 7总是从主监视器开始.
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);
}
}
}