使用 cradle getAttachment 从 CouchDB 获取二进制文件？

发布于 2024-11-19 05:13:51 字数 831 浏览 2 评论 0原文

我上传了一个 png 作为附件到 CouchDb 数据库。当我通过蒲团查看它时，它很好，如果我尝试通过摇篮取回它，它就会损坏。我使用了 crade 附带的 crade-test.js 中的一个片段，并对它进行了一些修改：

      var response = {};
      var streamer = db.getAttachment(data.id,filename);
      streamer.addListener('response', function (res) {
        response.headers = res.headers;
        response.headers.status = res.statusCode;
        response.body = "";
      });
      streamer.addListener('data', function (chunk) { response.body += chunk; });
      streamer.addListener('end', function () {
        fs.writeFile('new-'+filename, response.body, function (err) {
          if (err) throw err;
            console.log('It\'s saved!');
          });
        });

结果是一个比输入更大的损坏的 png。我在这里提供了一个工作示例： http://jsfiddle.net/x8GZc/

原文

I uploaded a png as attachment to a CouchDb database. When I have look at it via Futon it is fine, if I try to get it back via cradle it is corrupted. I used a snipptlet from the crade-test.js shipped with crade and modified it a bit:

      var response = {};
      var streamer = db.getAttachment(data.id,filename);
      streamer.addListener('response', function (res) {
        response.headers = res.headers;
        response.headers.status = res.statusCode;
        response.body = "";
      });
      streamer.addListener('data', function (chunk) { response.body += chunk; });
      streamer.addListener('end', function () {
        fs.writeFile('new-'+filename, response.body, function (err) {
          if (err) throw err;
            console.log('It\'s saved!');
          });
        });

The result is a corrupted png that is bigger than the input. I provided a working example here: http://jsfiddle.net/x8GZc/

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ι不睡觉的鱼゛ 2024-11-26 05:13:51

您找到的代码片段与文本文档（=基本上是一个字符串）一起使用。
对于二进制数据（例如图像），您必须在响应对象上设置正确的编码：

stream = client.database('images').getAttachment(req.params.id, filename);
// response is your HTTP response object
stream.on('data', function(chunk) {
    return response.write(chunk, "binary");
});
stream.on('end', function() {
    return response.end();
});

The snippet you found is used with a text document (= basically a string).
For binary data (e.g. images), you must set the correct encoding on the response object:

stream = client.database('images').getAttachment(req.params.id, filename);
// response is your HTTP response object
stream.on('data', function(chunk) {
    return response.write(chunk, "binary");
});
stream.on('end', function() {
    return response.end();
});

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