我可以在 Java/Groovy 中以编程方式更改 Windows 桌面墙纸吗? [英] Can I change my Windows desktop wallpaper programmatically in Java/Groovy?

问题描述

有没有办法在 Windows XP 中使用 Java(或 Groovy)来更改我的桌面墙纸?我有一个每天(或任何时候)都会创建一个新图像的程序，我想要一种自动更新我的桌面的方法.

Is there a way I can use Java (or Groovy) to change my desktop wallpaper in Windows XP? I have a program that creates a new image every day (or whenever) and I would like a way to automatically update my desktop.

我在这个网站上看到了一些关于 C++ 或 .NET 的问题，但我没有看到任何特定于 Java 的内容.

I've seem some questions on this site about C++ or .NET, but I did not see anything specific to Java.

推荐答案

抱歉，我有点落后于 @ataylor 的答案，因为我正在准备一个片段来完成它.是的，JNA 是一种正确的方法.给你:

Sorry I'm a bit behind @ataylor's answer because I was preparing a snippet to do it. Yes, JNA is a correct approach. Here you go:

import java.util.HashMap;

import com.sun.jna.Native;
import com.sun.jna.platform.win32.WinDef.UINT_PTR;
import com.sun.jna.win32.*;

public class WallpaperChanger {
   public static void main(String[] args) {
      //supply your own path instead of using this one
      String path = "C:\Users\Public\Pictures\Sample Pictures\Chrysanthemum.jpg";

      SPI.INSTANCE.SystemParametersInfo(
          new UINT_PTR(SPI.SPI_SETDESKWALLPAPER), 
          new UINT_PTR(0), 
          path, 
          new UINT_PTR(SPI.SPIF_UPDATEINIFILE | SPI.SPIF_SENDWININICHANGE));
   }

   public interface SPI extends StdCallLibrary {

      //from MSDN article
      long SPI_SETDESKWALLPAPER = 20;
      long SPIF_UPDATEINIFILE = 0x01;
      long SPIF_SENDWININICHANGE = 0x02;

      SPI INSTANCE = (SPI) Native.loadLibrary("user32", SPI.class, new HashMap<Object, Object>() {
         {
            put(OPTION_TYPE_MAPPER, W32APITypeMapper.UNICODE);
            put(OPTION_FUNCTION_MAPPER, W32APIFunctionMapper.UNICODE);
         }
      });

      boolean SystemParametersInfo(
          UINT_PTR uiAction,
          UINT_PTR uiParam,
          String pvParam,
          UINT_PTR fWinIni
        );
  }
}

你需要在类路径上有 JNA 库才能工作.这是在 Windows 7 中测试过的，在 XP 中可能会有一些细微差别，但我认为它应该可以工作.该 API 大概是稳定的.

You need to have the JNA libraries on the classpath for this to work. This was tested in Windows 7, there might be some nuances in XP but I think it should work. That API is presumably stable.

• 设置壁纸 - Coding4Fun莉>
• 如何确定屏幕保护程序是否正在运行Java?
• W32API.java

我之前省略了选项 SPIF_UPDATEINIFILE 和 SPIF_SENDWININICHANGE.现在正在按照 Coding4Fun MSDN 文章中的建议使用这些方法.

I had previously omitted the options SPIF_UPDATEINIFILE and SPIF_SENDWININICHANGE. These are now being used as they were suggested in the Coding4Fun MSDN article.

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