如何用JNI或JNA阅读窗口标题？ [英] How can I read the window title with JNI or JNA?

问题描述

希望重新回到发展空间;主要使用Java来调用一些原生的win32函数（我不想在.NET中构建）....

Looking to get back into the development space; primarily using Java to call some native win32 functions (I don't desire to build in .NET)....

有人能指出我能去的地方吗？使用Java（JNI / JNA / SWIG）从不同的运行窗口中读取标题。假设您知道您尝试连接的应用程序在内存空间中的哪个位置。

Can someone point me to a place where I can read the title from a differnt running window using Java (JNI/JNA/SWIG). Assume you would know where in the memory space the application you are attempting to hook into is.

推荐答案

在JNA中：

public interface User32 extends StdCallLibrary {
    User32 INSTANCE = (User32) Native.loadLibrary("user32", User32.class);

    int GetWindowTextA(PointerType hWnd, byte[] lpString, int nMaxCount);
}

使用它：

byte[] windowText = new byte[512];

PointerType hwnd = ... // assign the window handle here.
User32.INSTANCE.GetWindowTextA(hwnd, windowText, 512);
System.out.println(Native.toString(windowText));

您可能希望为HWND使用正确的结构映射，并允许unicode支持;您可以在 JNA网站上找到有关如何操作的信息和更多示例。

You'll probably want to use the proper structure mappings for HWND and also allow unicode support; you can find that information and more examples on how to do that at the JNA website.

GetWindowText函数的文档可在 MSDN 。

The documentation for GetWindowText function is available here in MSDN.

JNA的文档位于 jna.dev.java.net

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