Java 和 SetWindowDisplayAffinity

Question

我正在使用 jna.extra.User32Extra 库，我必须更改 windowdisplayaffinity 值。 不幸的是，输出总是错误的，我不知道为什么，并且这段代码不起作用。我希望 WDA_MONITOR 在打印屏幕时使窗口变黑

public class Browser extends Application {
    @Override
    public void start(Stage stage) throws Exception {
        StackPane pane = new StackPane();
        WebView view = new WebView();

        WebEngine engine = view.getEngine();
        engine.load("https://google.com");
        pane.getChildren().add(view);

        Scene scene = new Scene(pane, 1280, 720);
        stage.setTitle("Browser JAVA");        
        stage.setScene(scene);

        WinDef.HWND hWnd = User32.INSTANCE.FindWindow(null, "");
        boolean output = User32Extra.INSTANCE.SetWindowDisplayAffinity(hWnd, 1); 
        System.out.println("output "+output);//false

        stage.show();
    }

    public static void main(String[] args) throws IOException {
        Application.launch(args);
    }
}

Answer 1

也许您的窗口不是顶部窗口，如文档所示:

it returns FALSE when, for example, the function call is made on a non top-level window. https://learn.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-setwindowdisplayaffinity

你应该按照文档所说的去做:

To get extended error information, call GetLastError.