如何添加到Firefox插件中的文件？ [英] How to Append to a file in a Firefox add-on?

问题描述

  var tabs = require（sdk / tabs）; 
 var iofile = require（sdk / io / file）; 
 var widgets = require（sdk / widget）; 
 var selection = require（sdk / selection）; 
 
 
 function console_log（text）{
 console.log（selection.text）; 
 
 
 function print（text）{
 console.log（text）; 
} 
 
函数dir_object（object_to_parse）{
 var name =''; 
 for（name in object_to_parse）{
 print（name）; 
 
 
 
函数write_text（filename，text）{
 var fh = iofile.open（filename，'w'）; 
 var content = fh.read（）; 
 
 dir_object（fh）; 
 
 selected_text = text +\\\
; 
 fh.write（selected_text）; 
 fh.flush（）; 
 fh.close（）
} 
 
函数select_text_handler（）{
 write_text（'/ tmp / foo'，selection.text）; 
 
 
 var widget = widgets.Widget（{
 id：scribus-link，
 label：Scribus网站，
 contentURL： http://www.mozilla.org/favicon.ico，
 onClick：function（）{
} 
}）; 
 
 
 $ b selection.on（'select'，function（）{select_text_handler（）;}）; 
  

'打开'w'中的文件并截断​​我现有的文件！我如何打开追加模式，然后寻求？ https：//addons.mozilla .org / en-US / developers / docs / sdk / latest / modules / sdk / io / file.htm

SDK的文件模块非常有限。当打开一个文件写入它总是会被截断（代码）。而且，它在主线程上使用完全同步的I / O，这不是一件好事，因为它会在I / O期间阻塞整个UI。

您应该使用另一种机制，通过 chrome 模块。请参阅 OS.File 和/或 MDN File I / O snippets 。

var tabs = require("sdk/tabs");
var iofile = require("sdk/io/file");
var widgets = require("sdk/widget");
var selection = require("sdk/selection");


function console_log(text) {
    console.log(selection.text);
}

function print(text) {
    console.log(text);
}

function dir_object(object_to_parse) {
    var name = '';
    for (name in object_to_parse) {
        print(name);
    }
}

function write_text(filename, text) {
    var fh = iofile.open(filename, 'w');
    var content = fh.read();

    dir_object(fh);

    selected_text = text + "\n";
    fh.write(selected_text);
    fh.flush();
    fh.close()
}

function select_text_handler() { 
    write_text('/tmp/foo', selection.text);
}

var widget = widgets.Widget({
    id: "scribus-link",
    label: "Scribus website",
    contentURL: "http://www.mozilla.org/favicon.ico",
    onClick: function() {
    }
});



selection.on('select', function () { select_text_handler(); });

'open' the file in 'w' and that truncates my existing file! How do i open in 'append' mode and then 'seek'?? https://addons.mozilla.org/en-US/developers/docs/sdk/latest/modules/sdk/io/file.htm

解决方案

The file module of the SDK is pretty limited. When opening a file for writing it will always be truncated (code). Also, it is uses entirely synchronous I/O on the main thread, which isn't really a good thing to do, as it will block the entire UI during the I/O.

You should probably use another mechanism via the chrome module. See OS.File and/or the MDN File I/O snippets.

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