浏览器调用GoldenDict查词
浏览器调用GoldenDict查词
GoldenDict不支持对Windows平台中Firefox浏览器的网页查词，下面提供一种利用Tampermonkey和Python配合实现查词的方案。
方案探索
在网络上可以查到执行GoldenDict.exe hello这条命令可以调出GoldenDict对hello这个词的查询小窗口，遂想到去看一下源代码中是怎么实现的。
在源代码的main.cc中的main函数有如下一行代码：
app.sendMessage( QString( "translateWord: " ) + gdcl.wordToTranslate() );
从这里我想到模拟这行代码是不是就可以调出查词小窗口。在网上搜寻一番后在https://github.com/qtproject/qt-solutions/blob/master/qtsingleapplication/src/qtlocalpeer.cpp找到了 sendMessage 的实现。
下面就是使用Python编写模仿调用的代码了，在代码中需注意函数connectToServer的参数，例：qtsingleapp-Golden-86bf-3，这个参数是在QtLocalPeer的构造函数中生成的，使用CRC-16/X25计算字符串GoldenDict得出86bf，后面的数字是登录Windows系统时的会话ID。
步骤
本方案仅供演示。
一、编写Tampermonkey用户脚本实现一个在网页中划词翻译的界面，选中词语后请求由Python脚本Web服务器提供的特定网址。
let id = 0
window.addEventListener('mouseup',(e)=>{
let s = window.getSelection();
if(s.toString().length > 0) {
let elm = document.getElementById('goldendict')
if (e.target === elm){
return
}
elm.style.left = `${e.clientX}px`
elm.style.top = `${e.clientY}px`
elm.style.marginTop = window.getComputedStyle(s.anchorNode.parentElement)['font-size']
elm.style.visibility = 'visible'
elm.classList.toggle('dictshow',true)
let lid = setTimeout(function(){
if(id != lid) return
elm.style.visibility = 'hidden'
},3000)
id = lid
}
})
function initdict() {
document.body.insertAdjacentHTML('beforeend',
`<style>#goldendict.dictshow:hover{visibility:visible !important;}</style>
<button id="goldendict" class="dictshow" style="position:fixed;top:-100px;left:0px;width: max-content;background:white;"
onclick="fetch('http://localhost:8080/query/'+window.getSelection().toString());this.classList.toggle('dictshow',false);this.style.visibility='hidden';"
>Search</button>`)
}
initdict()
效果如下：
二、编写Python脚本，接受浏览器请求，调用GoldenDict查词
要向GoldenDict传递信息需要安装PyQt5。最简单做法就是分析出要查的词后，直接调用os.system('GoldenDict.exe '+ word)，这里使用Qt的LocalSocket。
代码由两部分组成：
- 简单的Web服务器
- 对照参考链接2中的
QtLocalPeer::sendMessage函数编写的__opendict
import os
import re
from PyQt5.QtCore import QDataStream,QByteArray
from PyQt5.QtNetwork import QLocalSocket
import http.server
import socketserver
import ctypes
timeout = 3000
port = 8080
d = ctypes.c_long()
lockfile = 'qtsingleapp-Golden-86bf-'
if ctypes.windll.kernel32.ProcessIdToSessionId(os.getpid(),ctypes.byref(d)):
lockfile = lockfile + str(d.value)
else:
print("can't get the sessionid.")
exit()
class HTTPRequestHandler(http.server.BaseHTTPRequestHandler):
def __init__(self, request, client_address, server):
self.lockfile = lockfile
http.server.BaseHTTPRequestHandler.__init__(self, request, client_address, server)
def do_GET(self):
print(self.path)
words = re.findall('^/query/([^/]+)$', self.path)
if len(words) == 0:
self.__send_code(404)
return
self.__send_code(200)
self.__opendict(words[0])
def __send_code(self, code):
self.send_response(code)
self.send_header('Access-Control-Allow-Origin', '*')
self.end_headers()
def __opendict(self, word):
if len(word) == 0:
return
try:
soc = QLocalSocket()
soc.connectToServer(self.lockfile)
if not soc.waitForConnected(timeout):
print(soc.errorString())
return
qdata = QDataStream(soc)
msg = 'translateWord: ' + word
qb = QByteArray(msg.encode())
qdata.writeBytes(qb)
s = soc.waitForBytesWritten(timeout)
if s:
s &= soc.waitForReadyRead(timeout)
if s:
print(soc.readAll().data().decode())
print('LocalSocketError:%d'%(soc.error()))
print('LocalSocketState:%d'%(soc.state()))
except Exception as e:
raise e
finally:
soc.disconnectFromServer()
if soc.waitForConnected(1000):
print("Socked Closed.")
else:
print('LocalSocketError on close:%d'%(soc.error()))
httpd = socketserver.TCPServer(('', port), HTTPRequestHandler)
try:
httpd.serve_forever()
except KeyboardInterrupt:
httpd.shutdown()
exit()
在浏览器中访问http://localhost:8080/query/dictionary，GoldenDict会在你鼠标指针处弹出单词dictionary的查询小窗口。
参考链接：
https://github.com/goldendict/goldendict/blob/master/main.cc
https://github.com/qtproject/qt-solutions/blob/master/qtsingleapplication/src/qtlocalpeer.cpp
https://doc.qt.io/qt-5/qlocalsocket.html
https://stackoverflow.com/questions/12712360/qtsingleapplication-for-pyside-or-pyqt
