使用C#实现动态壁纸

在这篇文章中,我们将探讨如何使用C#来实现动态壁纸功能。我们将使用Unsplash API来获取高质量的图片,并编写代码来自动更新桌面壁纸。

准备工作

安装必要的NuGet包:
- RestSharp: 用于发送HTTP请求
- Newtonsoft.Json: 用于JSON序列化和反序列化
获取Unsplash API密钥:
- 访问 Unsplash Developer 注册一个开发者账户
- 创建一个新的应用程序并获取API密钥

实现步骤

1. 创建项目和类

首先,创建一个新的C#控制台应用程序,并添加以下类:

C#
using System;
using System.IO;
using System.Runtime.InteropServices;
using RestSharp;
using Newtonsoft.Json.Linq;

namespace DynamicWallpaper
{
    class Program
    {
        static void Main(string[] args)
        {
            var wallpaperChanger = new WallpaperChanger();
            wallpaperChanger.ChangeWallpaper();
        }
    }

    public class WallpaperChanger
    {
        private const string API_KEY = "YOUR_UNSPLASH_API_KEY";
        private const string WALLPAPER_PATH = @"C:\Wallpapers\wallpaper.jpg";

        public void ChangeWallpaper()
        {
            string imageUrl = GetRandomImageUrl();
            DownloadImage(imageUrl);
            SetWallpaper(WALLPAPER_PATH);
        }

        // 实现其他方法...
    }
}

2. 获取随机图片URL

实现GetRandomImageUrl方法来从Unsplash API获取随机图片的URL:

C#
private string GetRandomImageUrl()
{
    var client = new RestClient("https://api.unsplash.com");
    var request = new RestRequest("/photos/random", Method.Get);
    request.AddParameter("orientation", "landscape");
    request.AddParameter("query", "landscape");
    request.AddHeader("Authorization", $"Client-ID {API_KEY}");
    request.AddHeader("Accept-Version", "v1");

    var response = client.Execute(request);
    if (response.IsSuccessful)
    {
        var json = JObject.Parse(response.Content);
        return json["urls"]["full"].ToString();
    }
    else
    {
        throw new Exception("Failed to get random image URL");
    }
}

3. 下载图片

实现DownloadImage方法来下载图片并保存到本地:

C#
private void DownloadImage(string imageUrl)
{
    var client = new RestClient(imageUrl);
    var request = new RestRequest(Method.Get);
    request.AddHeader("Authorization", $"Client-ID {API_KEY}");
    request.AddHeader("Accept-Version", "v1");

    byte[] response = client.DownloadData(request);
    File.WriteAllBytes(WALLPAPER_PATH, response);
}

4. 设置壁纸

实现SetWallpaper方法来将下载的图片设置为桌面壁纸:

C#
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);

private void SetWallpaper(string path)
{
    const int SPI_SETDESKWALLPAPER = 20;
    const int SPIF_UPDATEINIFILE = 0x01;
    const int SPIF_SENDWININICHANGE = 0x02;

    SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, path, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
}

使用说明

将API_KEY常量替换为你的Unsplash API密钥。
根据需要修改WALLPAPER_PATH常量,指定保存壁纸的路径。
运行程序,它将自动下载一张随机风景图片并设置为桌面壁纸。

自动化更新壁纸

要实现自动更新壁纸,你可以:

将程序设置为Windows计划任务,定期运行。
或者,将程序修改为一个长时间运行的服务,使用定时器定期更新壁纸。

例如,使用定时器:

C#
using System.Timers;

public class WallpaperChanger
{
    private Timer timer;

    public void Start()
    {
        timer = new Timer(3600000); // 每小时更新一次
        timer.Elapsed += (sender, e) => ChangeWallpaper();
        timer.Start();

        ChangeWallpaper(); // 立即更新一次
    }

    // ... 其他方法 ...
}

然后在Main方法中:

C#
static void Main(string[] args)
{
    var wallpaperChanger = new WallpaperChanger();
    wallpaperChanger.Start();

    Console.WriteLine("Press any key to exit...");
    Console.ReadKey();
}

完整代码

WallpaperChanger类

C#
using Newtonsoft.Json.Linq;
using RestSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace AppDw
{
    public class WallpaperChanger
    {
        private const string API_KEY = "nDV6d5_Cfqs9uG-xxxxxxx";//更换成你申请的Key
        private const string WALLPAPER_PATH = @"C:\Wallpapers\wallpaper.jpg";
        private System.Timers.Timer timer;

        public void ChangeWallpaper()
        {
            string imageUrl = GetRandomImageUrl();
            DownloadImage(imageUrl);
            SetWallpaper(WALLPAPER_PATH);
        }

        public void Start()
        {
            timer = new System.Timers.Timer(3600000); // 每小时更新一次
            timer.Elapsed += (sender, e) => ChangeWallpaper();
            timer.Start();

            ChangeWallpaper(); // 立即更新一次
        }

        private string GetRandomImageUrl()
        {
            var client = new RestClient("https://api.unsplash.com");
            var request = new RestRequest("/photos/random", Method.Get);
            request.AddParameter("orientation", "landscape");
            request.AddParameter("query", "landscape");
            request.AddHeader("Authorization", $"Client-ID {API_KEY}");
            request.AddHeader("Accept-Version", "v1");

            var response = client.Execute(request);
            if (response.IsSuccessful)
            {
                var json = JObject.Parse(response.Content);
                return json["urls"]["full"].ToString();
            }
            else
            {
                throw new Exception("Failed to get random image URL");
            }
        }

        private void DownloadImage(string imageUrl)
        {
            var client = new RestClient(imageUrl);
            var request = new RestRequest(imageUrl, Method.Get);
            request.AddHeader("Authorization", $"Client-ID {API_KEY}");
            request.AddHeader("Accept-Version", "v1");

            byte[] response = client.DownloadData(request);
            File.WriteAllBytes(WALLPAPER_PATH, response);
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);

        private void SetWallpaper(string path)
        {
            const int SPI_SETDESKWALLPAPER = 20;
            const int SPIF_UPDATEINIFILE = 0x01;
            const int SPIF_SENDWININICHANGE = 0x02;

            SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, path, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
        }
    }
}

结论

通过这个项目,我们实现了一个简单但功能强大的动态壁纸程序。它利用Unsplash API获取高质量的图片,并使用C#的系统调用来设置桌面壁纸。你可以进一步扩展这个程序,添加更多功能,如根据时间或天气条件选择不同类型的图片,或者允许用户设置自己的偏好。

目录