如何在Chrome应用中保存多个文件

Question

我想在一个操作中将多个文件保存到目录中.如果我理解正确的铬文件系统的API文档,当我使用这应该是可能openDirectory的选项chrome.fileSystem.chooseEntry.这甚至是允许的吗？
但是,文档非常简约,我也没有通过谷歌找到任何例子.

更多背景:
我有权访问目录并具有写权限:

/*you need chrome >= Version 31.x [currently chrome beta]*/
"permissions": [
    {"fileSystem": ["write", "directory"]}, "storage", 
]

然后你留下chrome.fileSystem.chooseEntry(对象选项,函数回调)和chrome.fileSystem.getWritableEntry(条目入口,函数回调),但我没有弄清楚这些函数是否是我想要的.

以下是如何将单个文件保存到文件系统:

chrome.fileSystem.chooseEntry({type:"saveFile", suggestedName:"image.jpg"}, 
    function(entry, array){
        save(entry, blob); /*the blob was provided earlier*/
    }
);

function save(fileEntry, content) {
    fileEntry.createWriter(function(fileWriter) {
        fileWriter.onwriteend = function(e) {
            fileWriter.onwriteend = null;
            fileWriter.truncate(content.size);
        };
        fileWriter.onerror = function(e) {
            console.log('Write failed: ' + e.toString());
        };
        var blob = new Blob([content], {'type': 'image/jpeg'});
        fileWriter.write(blob);
    }, errorHandler);
}

但是当我使用chrome.fileSystem.chooseEntry({type:"openDirectory",..}或者openDirectory只授予我读取权限时,如何保存多个文件？

Answer 1

我相信这应该有效.

chrome.fileSystem.chooseEntry({type:'openDirectory'}, function(entry) {
    chrome.fileSystem.getWritableEntry(entry, function(entry) {
        entry.getFile('file1.txt', {create:true}, function(entry) {
            entry.createWriter(function(writer) {
                writer.write(new Blob(['Lorem'], {type: 'text/plain'}));
            });
        });
        entry.getFile('file2.txt', {create:true}, function(entry) {
            entry.createWriter(function(writer) {
                writer.write(new Blob(['Ipsum'], {type: 'text/plain'}));
            });
        });
    });
});