android - phonegap filewriter 追加问题

Question

尝试使用 phonegap 0.9.6 文件存储。该代码在我编写文件时工作正常，但在我尝试附加到文件(使用搜索、截断等)时不起作用。

版本 0.9.5 中有一个错误似乎已修复。

代码在我调用 writer.seek 时终止。截断后的警报(或者如果我删除截断搜索)根本没有被调用。

我应该在某处设置附加标志吗？该文档说但没有给出我应该在哪里设置追加标志的示例。代码如下

function gotFS(fileSystem) {
        fileSystem.root.getFile( "test.txt", {"create":true,
            "exclusive":false}, gotFileEntry, fail);
    }

    function gotFileEntry(fileEntry) {
        fileEntry.createWriter(gotFileWriter, fail);
    }

    function gotFileWriter(writer) {
        writer.onwrite = function(evt) {
            console.log("write success");
        };

        writer.write("some sample text");
        // contents of file now 'some sample text'
        writer.truncate(11);
        alert('truncated');
        // contents of file now 'some sample'
        writer.seek(writer.length); //writer.seek(4) does not work either

        // contents of file still 'some sample' but file pointer is after the 'e' in 'some'
        writer.write(" different text");
        // contents of file now 'some different text'
        alert('success with diff text');
    }

如有任何帮助，我们将不胜感激。

Answer 1

我找到了解决方法:

        function gotFileWriter(writer) {
            writer.onwrite = function(evt) {
                console.log("write success");
            };

            writer.write("some sample text");
            // contents of file now 'some sample text'
            writer.abort();
            writer.truncate(11);
            // contents of file now 'some sample'
            writer.abort();
            writer.seek(writer.length); //writer.seek(4) does not work either

            // contents of file still 'some sample' but file pointer is after the 'e' in 'some'
            writer.write(" different text");
        }