使用Firefox插件（SDK）保存网站图片 [英] Save website image using a Firefox Addon (SDK)

问题描述

我可以在网站上抓取图像的网址，但是我想将图像下载到本地驱动器。我其实想要标准的下载提示。什么是使用Firefox的Addon SDK（使用Javascript）做到这一点的最佳方式？ 所以使用一些代码从Firefox的<一个href =https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsIWebBrowserPersist?redirectlocale=en-US&redirectslug=nsIWebBrowserPersist =nofollow> nsIWebBrowserPersist文档，我拼凑了这个一起。我不明白涉及的一些范围问题，这不会提示用户在哪里或如何保存。对于我的目的，它的工作原理，但我想要一个更好的解决方案，如果有一个。

 函数DownloadImage（aURLToDownload， aSaveToFile）
 {
尝试{
 
 //下载：aURLToDownload 
 var downloadURI = Cc [@ mozilla.org/network/io-service;1 ] .getService（Ci.nsIIOService）.newURI（aURLToDownload，null，null）; 
 console.log（Saving from：+ aURLToDownload）; 
 
 //下载目标
 console.log（另存为：+ aSaveToFile）; 
 var outputFile = Cc [@ mozilla.org/file/local;1\"].createInstance(Ci.nsILocalFile）; 
 outputFile.initWithPath（aSaveToFile）
 
 var persist = Cc [@ mozilla.org/embedding/browser/nsWebBrowserPersist;1\"].createInstance(Ci.nsIWebBrowserPersist）; 
 
 persist.progressListener = {
 // onComplete：function（）{
 // alert（Download complete：+ aSaveToFile）; 
 //} 
 onProgressChange：function（aWebProgress，aRequest，aCurSelfProgress，aMaxSelfProgress，aCurTotalProgress，aMaxTotalProgress）{
 var percentComplete =（aCurTotalProgress / aMaxTotalProgress）* 100; 
 console.log（percentComplete +％）; 
} 
 // onStateChange：function（aWebProgress，aRequest，aStateFlags，aStatus）{
 //} 
}; 
 
 persist.saveURI（downloadURI，null，null，null，，outputFile）; 
} catch（e）{
 console.log（e）; 
} 
} 
  

I am able to grab the URL of an image on a website, but I want to download the image to the local drive. I actually want the standard download prompt. What is the best way to do this using Firefox Addon SDK (using Javascript)?

解决方案

So using some code lifted from Firefox's nsIWebBrowserPersist docs, I cobbled this together. I don't understand some of the scope issues involved, and this does not prompt the user for where or how to save. For my purposes, it works, but I would like a better solution if there is one out there.

function DownloadImage(aURLToDownload, aSaveToFile)
{
    try {

        // download from: aURLToDownload
        var downloadURI = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService).newURI(aURLToDownload, null, null);
        console.log("Saving from: " + aURLToDownload);

        // download destination
        console.log("Saving as: " + aSaveToFile);
        var outputFile = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile); 
        outputFile.initWithPath(aSaveToFile)

        var persist = Cc["@mozilla.org/embedding/browser/nsWebBrowserPersist;1"].createInstance(Ci.nsIWebBrowserPersist);

        persist.progressListener = {
            // onComplete: function(){
                // alert("Download complete: " + aSaveToFile);
            // }
            onProgressChange: function(aWebProgress, aRequest, aCurSelfProgress, aMaxSelfProgress, aCurTotalProgress, aMaxTotalProgress) {
                var percentComplete = (aCurTotalProgress/aMaxTotalProgress)*100;
                console.log(percentComplete +"%");
            }
            // onStateChange: function(aWebProgress, aRequest, aStateFlags, aStatus) {
            // }
        };

        persist.saveURI(downloadURI, null, null, null, "", outputFile);
    } catch (e) {
        console.log(e);
    }
}

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