Question

我想在Firefox的扩展程序中获取页面的大小。之前，我使用过这段代码：

var pageSize         = null,
    cacheService     = Components.classes["@mozilla.org/network/cache-service;1"].getService(Components.interfaces.nsICacheService),
    httpCacheSession = cacheService.createSession("HTTP", 0, true),
    cacheEntryDescriptor;

httpCacheSession.doomEntriesIfExpired = false;

cacheEntryDescriptor = httpCacheSession.openCacheEntry(content.document.location.toString().replace(/#.*$/, ""), Components.interfaces.nsICache.ACCESS_READ, false);

if ( cacheEntryDescriptor ) {
    pageSize = Math.round(cacheEntryDescriptor.dataSize / 1024 * 100) / 100;
}

但是在更新浏览器之后，我收到错误：

NS_ERROR_NOT_AVAILABLE: Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsICacheSession.openCacheEntry]

排队：

cacheEntryDescriptor = httpCacheSession.openCacheEntry(content.document.location.toString().replace(/#.*$/, ""), Components.interfaces.nsICache.ACCESS_READ, false);

如何解决这个问题？

Answer 1

从主线程调用时，

openCacheEntry失败，请使用asyncOpenCacheEntry

获取Firefox的扩展页面大小

1 个答案: