将外部pdf文件下载到chrome打包的应用程序的文件系统中 [英] Download external pdf files to chrome packaged app's file system

问题描述

是否可以将服务器上的pdf文件保存到chrome打包的应用程序中?

Is there any way to save pdf files from server to chrome packaged app?

在我的chrome打包应用中，我有类似的东西，

In my chrome packaged app, i have some thing like this,

下载

当用户单击此超级链接时，我应该能够将该pdf文件下载到我的chrome打包的应用程序文件系统中.

when user clicks on this hyper link, i should able download that pdf file into my chrome packaged app file system.

推荐答案

下载PDF文件没有什么特别的地方.使用XMLHttpRequest下载文件，然后使用文件API将其写入沙盒文件或使用chrome.fileSystem.chooseEntry获得其FileEntry的外部文件.

There's nothing special about downloading PDF files. Use XMLHttpRequest to download a file, and then use the file APIs to either write it to a sandboxed file, or to an external file whose FileEntry you get with chrome.fileSystem.chooseEntry.

下载后，如果先使用FileReader.readAsDataURL将PDF转换为数据URL，则可以在Web视图中显示PDF或提供链接以在外部浏览器中打开它. (您不能将下载的文件作为file:// URL引用.)

Once downloaded, you can display the PDF in a webview or provide a link to open it in an external browser if you first convert it to a data URL with FileReader.readAsDataURL. (You can't reference the downloaded file as file:// URL.)

(Chrome应用程序不应被称为打包"应用程序，因为后者是指现在已经过时的旧版应用程序技术.)

(Chrome Apps should not be referred to as "packaged" apps, as the latter term refers to a now-obsolete legacy app technology.)

更新:要将下载的Blob保存到文件中，

Update: To save the downloaded blob to a file:

// Save a blob in a FileEntry
// (e.g., from a call to chrome.fileSystem.chooseEntry)
function saveToEntry(blob, fileEntry) {
    fileEntry.createWriter(
        function(writer) {
            writer.onerror = errorHandler; // you supply this
            writer.truncate(0);
            writer.onwriteend = function () {
                writer.write(blob);
                writer.onwriteend = function () {
                    // blob has been written
                };
            };
        },
        errorHandler // you supply this
    );
}

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