c# - 複数のデスクトップ背景を設定する方法 (デュアルモニター)

Question

両方のモニターに 1 つの画像を設定するためのコードスニペットがありますが、最近ラップトップ用に 2 つ目のモニターを入手したため、各モニターに異なる画像を設定するためにコードを変更したいと考えました。

何か案は？

(シングルモニター用のこのコードスニペットは次のとおりです。

[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");
            }
        }

)

score 3 · Accepted Answer

さて、他の回答コードを取得し、少し修正しました....問題は、以前のコードが、作成する新しい画像の一番上と一番左にプライマリモニタがあると想定していたことです....私にとってはうまくいきませんでした。編集 --> Windows 7 と 10 では、並べて表示された画像の開始位置に関して動作が異なることがわかりました。Win 10 は左上から開始します.... Win 7 は常にプライマリモニターで開始します。

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);

        }
    }
}

score 1 · Accepted Answer

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);
        }
    }
}

score 1 · Accepted Answer

実際には違いはありません。

複数のモニターは、壁紙のスペースを大きくするだけだと考えてください。

したがって、複数の画像から壁紙画像を作成して、各モニターの四角形の領域を埋める必要があります。

この質問も重複しているように見えます

c# - 複数のデスクトップ背景を設定する方法 (デュアル モニター)

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c# - 複数のデスクトップ背景を設定する方法 (デュアルモニター)