我的网络上有一张图片。例如:https://www.gravatar.com/avatar/eb9895ade1bd6627e054429d1e18b576?s=24&d=identicon&r=PG&f=1
我想将其下载到我的高清文件夹中。
我试过这个但它没有用:在这里我XHR它并请求数据类型arraybuffer,然后当我尝试用OS.File写它时我收到此错误:TypeError: Value [object ArrayBuffer] cannot be converted to a pointer osfile_shared_allthreads.jsm:443
var {Cu: utils, Cc: classes, Ci: instances} = Components;
Cu.import('resource://gre/modules/Services.jsm');
function xhr(url, cb) {
let xhr = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);
let handler = ev => {
evf(m => xhr.removeEventListener(m, handler, !1));
switch (ev.type) {
case 'load':
if (xhr.status == 200) {
cb(xhr.response);
break;
}
default:
Services.prompt.alert(null, 'XHR Error', 'Error Fetching Package: ' + xhr.statusText + ' [' + ev.type + ':' + xhr.status + ']');
break;
}
};
let evf = f => ['load', 'error', 'abort'].forEach(f);
evf(m => xhr.addEventListener(m, handler, false));
xhr.mozBackgroundRequest = true;
xhr.open('GET', url, true);
xhr.channel.loadFlags |= Ci.nsIRequest.LOAD_ANONYMOUS | Ci.nsIRequest.LOAD_BYPASS_CACHE | Ci.nsIRequest.INHIBIT_PERSISTENT_CACHING;
xhr.responseType = "arraybuffer"; //dont set it, so it returns string, you dont want arraybuffer. you only want this if your url is to a zip file or some file you want to download and make a nsIArrayBufferInputStream out of it or something
xhr.send(null);
}
xhr('https://www.gravatar.com/avatar/eb9895ade1bd6627e054429d1e18b576?s=24&d=identicon&r=PG&f=1', data => {
Services.prompt.alert(null, 'XHR Success', data);
var file = OS.Path.join(OS.Constants.Path.desktopDir, "test.png");
var promised = OS.File.writeAtomic(file, data);
promised.then(
function() {
alert('succesfully saved image to desktop')
},
function(ex) {
alert('FAILED in saving image to desktop')
}
);
});
答案 0 :(得分:2)
你从我的解决方案中偷了一半:https://stackoverflow.com/a/25112976/3791822
另一半来自@ nmaier的解决方案:https://stackoverflow.com/a/25148685/3791822
非常好;)
哈哈,无论如何你真的很亲近。您获得了ArrayBuffer
但是将其作为Uint8Array
传递给了:
var promised = OS.File.writeAtomic(file, new Uint8Array(data));
我不知道这是否是下载它的最佳方式。但它几乎100%异步。也许这是最好的方式。真酷的男人!