JNA

Question

OS: Ubuntu 16.04
JNA: 4.2.X
JDK: 1.8.0u111

我正在尝试以编程方式在 JavaFX 应用程序上获取当前焦点 window。

if (Platform.isLinux()) {
    final X11 x11 = X11.INSTANCE;
    final XLib xlib = XLib.INSTANCE;

    X11.Display display = x11.XOpenDisplay(null);
    X11.Window window = new X11.Window();
    Pointer pointer = Pointer.NULL;

    xlib.XGetInputFocus(display, window, pointer); // << ERROR
    X11.XTextProperty name = new X11.XTextProperty();
    x11.XGetWMName(display, window, name);
    System.out.println(name.toString());
}

public interface XLib extends StdCallLibrary {

    XLib INSTANCE = (XLib) Native.loadLibrary("/usr/lib/x86_64-linux-gnu/libX11.so", XLib.class);

    int XGetInputFocus(X11.Display display, X11.Window focus_return, Pointer revert_to_return);
}

但是它不起作用并抛出这个异常：

java.lang.IllegalArgumentException: Unrecognized calling convention: 63
at com.sun.jna.Native.invokeInt(Native Method)
at com.sun.jna.Function.invoke(Function.java:390)
at com.sun.jna.Function.invoke(Function.java:323)
at com.sun.jna.Library$Handler.invoke(Library.java:236)
at com.sun.proxy.$Proxy1.XGetInputFocus(Unknown Source)
at application.Main.start(Main.java:33)

这条线是否正确？

XLib INSTANCE = (XLib) Native.loadLibrary("/usr/lib/x86_64-linux-gnu/libX11.so", XLib.class);

我用旧版本的 JNA (4.1.X) 进行了测试，错误更改为：

Unrecognized calling convention: 1

调试日志 -Djna.debug_load=true

Looking in classpath from sun.misc.Launcher$AppClassLoader@73d16e93 for /com/sun/jna/linux-x86-64/libjnidispatch.so
Found library resource at jar:file:/home/puglic/eclipse/jna-4.2.2.jar!/com/sun/jna/linux-x86-64/libjnidispatch.so
Looking for library 'X11'
Adding paths from jna.library.path: null
Trying libX11.so
Found library 'X11' at libX11.so
Looking for library 'X11'
Adding paths from jna.library.path: null
Trying libX11.so
Found library 'X11' at libX11.so
java.lang.IllegalArgumentException: Unrecognized calling convention: 63

Answer 1

您的 XLib 定义使用 StdCallLibrary，这仅在 32 位 windows 系统上有意义。它应该只是 Library，或者派生自 JNA contrib 定义的版本。

你基本上是在要求一个不存在的调用约定。

JNA - Ubuntu - XGetInputFocus

JNA - Ubuntu - XGetInputFocus

java

ubuntu

javafx