将外部pdf文件下载到chrome打包的应用程序的文件系统中

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
    );
}

这篇关于将外部pdf文件下载到chrome打包的应用程序的文件系统中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！