我正在尝试使用IActiveDesktop界面在Windows 7上更改桌面墙纸。因此,我开始我的项目,首先使用SystemParametersInfo类使用User32方法。但是没有褪色效果,我无法修改图像位置。经过研究,我发现了IActiveDesktop接口和这个question。我接受了答案,并做出了调整。但是,当我运行代码时,它会抛出Exception in thread "main" com.sun.jna.platform.win32.COM.COMException: No such interface supported(HRESULT: 80004002)
。
在这里您可以找到我的代码:
首先代表IActiveDesktop接口的类
import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.COM.COMUtils;
import com.sun.jna.platform.win32.COM.Unknown;
import com.sun.jna.platform.win32.*;
import com.sun.jna.ptr.PointerByReference;
import static com.sun.jna.platform.win32.Ole32.INSTANCE;
public class ActiveDesktop extends Unknown {
// {75048700-EF1F-11D0-9888-006097DEACF9}
// {F490EB00-1240-11D1-9888-006097DEACF9}
private static final Guid.GUID CLSID_ActiveDesktop = getGUID("{75048700-EF1F-11D0-9888-006097DEACF9}");
private static final Guid.GUID IID_IActiveDesktop = getGUID("{F490EB00-1240-11D1-9888-006097DEACF9}");
private static Guid.GUID getGUID(String guidStr) {
Guid.GUID guid = new Guid.GUID();
INSTANCE.IIDFromString(guidStr, guid);
return guid;
}
private ActiveDesktop(Pointer pvInstance) {
super(pvInstance);
}
public static ActiveDesktop create(){
PointerByReference p = new PointerByReference();
WinNT.HRESULT hr = INSTANCE.CoCreateInstance(CLSID_ActiveDesktop, null, WTypes.CLSCTX_INPROC_SERVER, IID_IActiveDesktop, p); // THE EXCEPTION IS THROW HERE
COMUtils.checkRC(hr);
return new ActiveDesktop(p.getValue());
}
}
还有刚刚加载Ole32库和IActiveDesktop接口的Main:
import com.sun.jna.platform.win32.Ole32;
public class Main {
public static void main(String[] args) {
Ole32.INSTANCE.CoInitializeEx(Pointer.NULL, Ole32.COINIT_MULTITHREADED);
try {
ActiveDesktop desktop = ActiveDesktop.create();
} finally {
Ole32.INSTANCE.CoUninitialize();
}
}
}
经过大量的搜寻,我找不到答案。谁能帮我?可能的答案是where I found this code...在这种情况下,请向我解释问题所在。谢谢。
注意:我是法语,所以我的英语不太好。对不起...
我终于找到了解决方案。初始化Ole32时,将Ole32.COINIT_MULTITHREADED
替换为Ole32.COINIT_APARTMENTTHREADED
。