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

问题描述

有没有一种方法可以使用Java（或Groovy）在Windows XP中更改桌面墙纸？我有一个程序每天创建一个新的图像（或任何时候），我想要一种方法来自动更新我的桌面。

我在这里看到了一些问题网站关于C ++或.NET，但我没有看到任何特定于Java的内容。

阿泰勒的回答是因为我正在准备一个片段来做到这一点。是的，JNA是一个正确的方法。这里你去：

  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）{
 //提供自己的路径而不是使用这个
 String path = C：\\\\\\\\\\\\\\\公司\\\\\\\\\\\' 
 
 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扩展StdCallLibrary {
 
 //从MSDN文章
 long SPI_SETDESKWALLPAPER = 20; 
长SPIF_UPDATEINIFILE = 0x01; 
长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）; 
} 
}）; 
 
布尔SystemParametersInfo（
 UINT_PTR uiAction，
 UINT_PTR uiParam，
字符串pvParam，
 UINT_PTR fWinIni 
）; 
 
 
 $ / code> 

您需要在类路径中包含JNA库这工作。这在Windows 7中进行了测试，XP中可能存在一些细微差别，但我认为它应该起作用。该API大概是稳定的。



引用

• 设置壁纸 - Coding4Fun


• 如何确定屏幕保护程序是否在Java中运行？


• W32API.java

编辑（2010/01/20）：

省略了选项 SPIF_UPDATEINIFILE 和 SPIF_SENDWININICHANGE 。现在正按照Coding4Fun MSDN文章中的建议使用它们。

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.

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

解决方案

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
        );
  }
}

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.

References

• Setting Wallpaper - Coding4Fun
• How to determine if a screensaver is running in Java?
• W32API.java

Edit (2010/01/20):

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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