Question

我正在尝试使用来自https://www.neontribe.co.uk/cordova-file-plugin-examples/

的示例使用cordova文件插件编写文件

这是我的代码：

var errorHandler = function (fileName, e) {  
        var msg = '';

        switch (e.code) {
            case FileError.QUOTA_EXCEEDED_ERR:
                msg = 'Storage quota exceeded';
                break;
            case FileError.NOT_FOUND_ERR:
                msg = 'File not found';
                break;
            case FileError.SECURITY_ERR:
                msg = 'Security error';
                break;
            case FileError.INVALID_MODIFICATION_ERR:
                msg = 'Invalid modification';
                break;
            case FileError.INVALID_STATE_ERR:
                msg = 'Invalid state';
                break;
            default:
                msg = 'Unknown error';
                break;
        };

    console.log('Error (' + fileName + '): ' + msg);
}

function writeToFile(fileName, data) {
    data = JSON.stringify(data, null, '\t');
    window.resolveLocalFileSystemURL(cordova.file.dataDirectory, function (directoryEntry) {
        directoryEntry.getFile(fileName, { create: true }, function (fileEntry) {
            fileEntry.createWriter(function (fileWriter) {
                fileWriter.onwriteend = function (e) {
                    // for real-world usage, you might consider passing a success callback
                    console.log('Write of file "' + fileName + '"" completed.');
                };

                fileWriter.onerror = function (e) {
                    // you could hook this up with our global error handler, or pass in an error callback
                    console.log('Write failed: ' + e.toString());
                };

                var blob = new Blob([data], { type: 'text/plain' });
                fileWriter.write(blob);
            }, errorHandler.bind(null, fileName));
        }, errorHandler.bind(null, fileName));
    }, errorHandler.bind(null, fileName));
}

writeToFile('example.json', { foo: 'bar' });

错误：

Error in Success callbackId: File681009815 : SyntaxError: Unexpected end of input:312

Uncaught SyntaxError: Unexpected end of input:314

Error in Success callbackId: File681009817 : TypeError: Illegal constructor:312

Uncaught TypeError: Illegal constructor:314

有关代码有什么问题的想法吗？

谢谢，菲利普

Answer 1

我猜你是在Android 4.x上测试的。我在Android 4.2.2上遇到了同样的问题。

首先，从platforms/android/platform_ww/cordova.js第289,312-314行注释try {} catch {}，以了解代码失败的确切行。它可能在var blob = new Blob([data], { type: 'text/plain' });

尝试在没有Blob()的情况下直接将数据写入FileWriter：

with blob

var blob = new Blob([data], { type: 'text/plain' });
fileWriter.write(blob);

没有blob

fileWriter.write(data);

本机api写一个String，所以只要你写文本它应该工作： https://github.com/apache/cordova-plugin-file/blob/master/src/android/FileUtils.java#L1129

另外，我会检查您尝试写入的数据是否正确，主要是由于此错误：

输入意外结束

最后，可能这个解决方案与此问题有关： https://stackoverflow.com/a/15302872/1786341

CORDOVA FILE PLUGIN未捕获TypeError：非法构造函数

1 个答案:

with blob

没有blob