我想要解释的Pyuno索引问题 [英] Pyuno indexing issue that I would like an explanation for

问题描述

以下python libreoffice Uno宏有效，但仅适用于try..except语句.
该宏允许您在编写者文档中选择文本，然后将其发送到默认浏览器中的搜索引擎.
问题是，如果您选择单个文本，则会填充oSelected.getByIndex(0)，但是如果您选择多个文本，则不会填充oSelected.getByIndex(0).在这种情况下，数据从oSelected.getByIndex(1)开始，而oSelected.getByIndex(0)留为空白.
我不知道为什么会这样，很想知道是否有人可以解释这种奇怪的行为.

The following python libreoffice Uno macro works but only with the try..except statement.
The macro allows you to select text in a writer document and send it to a search engine in your default browser.
The issue, is that if you select a single piece of text,oSelected.getByIndex(0) is populated but if you select multiple pieces of text oSelected.getByIndex(0) is not populated. In this case the data starts at oSelected.getByIndex(1) and oSelected.getByIndex(0) is left blank.
I have no idea why this should be and would love to know if anyone can explain this strange behaviour.

#!/usr/bin/python    
import os
import webbrowser
from configobj import ConfigObj
from com.sun.star.awt.MessageBoxButtons import BUTTONS_OK, BUTTONS_OK_CANCEL, BUTTONS_YES_NO, BUTTONS_YES_NO_CANCEL, BUTTONS_RETRY_CANCEL, BUTTONS_ABORT_IGNORE_RETRY
from com.sun.star.awt.MessageBoxButtons import DEFAULT_BUTTON_OK, DEFAULT_BUTTON_CANCEL, DEFAULT_BUTTON_RETRY, DEFAULT_BUTTON_YES, DEFAULT_BUTTON_NO, DEFAULT_BUTTON_IGNORE

from com.sun.star.awt.MessageBoxType import MESSAGEBOX, INFOBOX, WARNINGBOX, ERRORBOX, QUERYBOX

def fs3Browser(*args):
#get the doc from the scripting context which is made available to all scripts
    desktop = XSCRIPTCONTEXT.getDesktop()
    model = desktop.getCurrentComponent()
    doc = XSCRIPTCONTEXT.getDocument()
    parentwindow = doc.CurrentController.Frame.ContainerWindow

    oSelected = model.getCurrentSelection()
    oText = ""
    try:
        for i in range(0,4,1):
            print ("Index No ", str(i))
            try:
                oSel = oSelected.getByIndex(i)
                print (str(i), oSel.getString())
                oText += oSel.getString()+" "
            except:
                break
    except AttributeError:
        mess = "Do not select text from more than one table cell"
        heading = "Processing error"
        MessageBox(parentwindow, mess, heading, INFOBOX, BUTTONS_OK)
        return

    lookup = str(oText)
    special_c =str.maketrans("","",'!|@#"$~%&/()=?+*][}{-;:,.<>')
    lookup = lookup.translate(special_c)
    lookup = lookup.strip()
    configuration_dir = os.environ["HOME"]+"/fs3"
    config_filename = configuration_dir + "/fs3.cfg"
    if  os.access(config_filename, os.R_OK):
        cfg = ConfigObj(config_filename)

    #define search engine from the configuration file
    try:
        searchengine = cfg["control"]["ENGINE"]
    except:
        searchengine = "https://duckduckgo.com"
    if 'duck' in searchengine:
        webbrowser.open_new('https://www.duckduckgo.com//?q='+lookup+'&kj=%23FFD700 &k7=%23C9C4FF &ia=meanings')
    else:
        webbrowser.open_new('https://www.google.com/search?/&q='+lookup)
    return None
def MessageBox(ParentWindow, MsgText, MsgTitle, MsgType, MsgButtons):
    ctx = XSCRIPTCONTEXT.getComponentContext()
    sm = ctx.ServiceManager
    si = sm.createInstanceWithContext("com.sun.star.awt.Toolkit", ctx) 
    mBox = si.createMessageBox(ParentWindow, MsgType, MsgButtons, MsgTitle, MsgText)
    mBox.execute()    

推荐答案

您的代码缺少某些内容.此方法无需额外的try/except子句:

Your code is missing something. This works without needing an extra try/except clause:

selected_strings = []
try:
    for i in range(oSelected.getCount()):
        oSel = oSelected.getByIndex(i)
        if oSel.getString():
            selected_strings.append(oSel.getString())
except AttributeError:
    # handle exception...
    return
result = " ".join(selected_strings)

要回答有关奇怪行为"的问题，对我来说似乎很简单.如果第0个元素为空，则可能有多种选择，可能需要以不同的方式处理.

To answer your question about the "strange behaviour," it seems pretty straightforward to me. If the 0th element is empty, then there are multiple selections which may need to be handled differently.

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