监视突出显示的文本

问题描述

这更像是一个假设性问题，我正在为我正在计划的项目集思广益，并且很好奇是否有人知道任何 API 或在任何窗口上立即获取任何突出显示文本的方法，例如从浏览器或文字处理器.它也可能有一个只能在按下时读取的键命令(类似于 CTRL+C 将所选文本添加到剪贴板)

This is more of a hypothetical question, I'm brainstorming some ideas for a project that I'm planning, and was curious if anyone knew of any APIs or methods of getting any highlighted text instantly on any window, for example from a browser or word processor. It could also have possibly a key command that would only read when pressed (Akin to CTRL+C adding the selected text to a clipboard)

如果您知道有哪些 API 可用于此，我们将不胜感激.

Any knowledge in what APIs exist for this would be greatly appreciated.

推荐答案

您可以使用 JNA 在前台窗口实际模拟一个 Ctrl-C(复制操作)，然后读取其中的内容剪贴板，之后你只需要恢复剪贴板中的内容.

You can use JNA to actually emulate a Ctrl-C (copy action) on the foreground window, and then read what is in the clipboard, after that you just need to restore what was in the clipboard.

这是一个简短的示例:

import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;

import com.sun.jna.Native;
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.win32.StdCallLibrary;

public class Foo implements ClipboardOwner {
    public interface CustomUser32 extends StdCallLibrary {
        CustomUser32 INSTANCE = (CustomUser32) Native.loadLibrary("user32", CustomUser32.class);
        HWND GetForegroundWindow();
        void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);
    }

    public void lostOwnership(Clipboard clipboard, Transferable contents) {
        // dummy: needed for `ClipboardOwner`
    }

    void controlC(CustomUser32 customUser32) {
        customUser32.keybd_event((byte) 0x11 /* VK_CONTROL*/, (byte) 0, 0, 0);
        customUser32.keybd_event((byte) 0x43 /* 'C' */, (byte) 0, 0, 0);
        customUser32.keybd_event((byte) 0x43 /* 'C' */, (byte) 0, 2 /* KEYEVENTF_KEYUP */, 0);
        customUser32.keybd_event((byte) 0x11 /* VK_CONTROL*/, (byte) 0, 2 /* KEYEVENTF_KEYUP */, 0);// 'Left Control Up
    }

    String getClipboardText() throws Exception {
        return (String) Toolkit.getDefaultToolkit().getSystemClipboard().getData(DataFlavor.stringFlavor);
    }

    void setClipboardText(String data) throws Exception {
        Toolkit.getDefaultToolkit().getSystemClipboard().setContents(new StringSelection(data), this);
    }

    String getSelectedText(User32 user32, CustomUser32 customUser32) throws Exception {
        HWND hwnd = customUser32.GetForegroundWindow();
        char[] windowText = new char[512];
        user32.GetWindowText(hwnd, windowText, 512);
        String windowTitle = Native.toString(windowText);
        System.out.println("Will take selected text from the following window: [" + windowTitle + "]");
        String before = getClipboardText();
        controlC(customUser32); // emulate Ctrl C
        Thread.sleep(100); // give it some time
        String text = getClipboardText();
        System.out.println("Currently in clipboard: " + text);
        // restore what was previously in the clipboard
        setClipboardText(before);
        return text;
    }

    public static void main(String[] args) throws Exception {
        Foo foo = new Foo();
        Thread.sleep(2000); // take some time for you to select something anywhere
        System.out.println(foo.getSelectedText(User32.INSTANCE, CustomUser32.INSTANCE));
    }
}

当您运行它时，您将有两秒钟的时间在任何应用程序的某处选择一些文本，然后它通常会打印出来.

When you run it, you will have two seconds to select some text somewhere on any application, and then it will normally print it.

将从以下窗口中选取选定的文本:[java - 突出显示的监视器文本 - 堆栈溢出 - Google Chrome]

目前在剪贴板中:我正在为我正在计划的项目集思广益

Currently in clipboard: I'm brainstorming some ideas for a project that I'm planning

你不需要接受我的回答，这只是为了向你展示我在上面评论中所说的话.

You don't need to accept my answer, it was just to show you what I said in my comment above.

这篇关于监视突出显示的文本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！