如何在Firefox中使用XPCOM组件从缓存中获取图像 [英] How to get images from cache using a XPCOM Component in Firefox

问题描述

我需要获取文档中加载的所有图像的缓存文件路径，我想知道为此需要使用哪些接口

I need to get the cache file path for ever image loaded in a document, I am wondering what are the Interfaces I need to use in order to do that

https://developer.mozilla.org/en/XPCOM_Interface_Reference

推荐答案

这是我用来逐出缓存条目的方法:

This is what I used to evict cache entry:

  function removeItem(url){
    let cacheService = Components.classes["@mozilla.org/network/cache-service;1"]
                            .getService(Components.interfaces.nsICacheService);
    var Ci = Components.interfaces;
    var session = cacheService.createSession("image", Ci.nsICache.STORE_ANYWHERE, false);
    if(!session){
        return;
    }

    var entry;
    try{
        entry = session.openCacheEntry(url, Ci.nsICache.ACCESS_READ, false);
        if(!entry){
            return;
        }
    }catch(ex){
        return;
    }

    entry.doom();
    entry.close();
  }
}

输入后，您应该可以向其中打开一个流-可能获取内容，甚至替换它-我还没有尝试过.

Once you have entry you should be able to open a stream to it - possibly getting the content or even replacing it - I haven't tried it though.

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