GridFS:如何在< img/>中显示readstream.pipe(res)的结果标签? [英] GridFS : How to display the result of readstream.pipe(res) in an <img/> tag?
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问题描述
我正在将MangoDB和GridFS一起使用来存储图像.我已经有了从数据库检索图像的方法:
I am using MangoDB along with GridFS to store images. I've got this route to retrieve an image from the DB :
app.get("/images/profile/:uId", function (req, res) {
let uId = req.params.uId;
console.log(uId)
gfs.files.findOne(
{
"metadata.owner": uId,
"metadata.type": 'profile'
}
, function (err, file) {
if (err || !file) {
return res.status(404).send({ error: 'Image not found' });
}
var readstream = gfs.createReadStream({ filename: file.filename });
readstream.on("error", function (err) {
res.send("Image not found");
});
readstream.pipe(res);
});
});
这将返回类似的内容:
�PNG
IHDR���]�bKGD���̿ pHYs
�
�B(�xtIME� -u��~IDATx��i|TU����JDV�fH�0� :-
H_��M��03`���
(��-�q{U[�m�A��AQ�VZ�ҢbP��S�@K@��CB��|��T�[�=����"U��[��{�s�9�
�+)@eۿ���{�9���,?�T.S��xL֟x&@�0TSFp7���tʁ���A!_����D�h�
z����od�G���YzV�?e���|�h���@P�,�{�������Z�l\vc�NӲ�?
n��(�r�.......
似乎我正确地获得了png.然后如何在img标签中显示它?
It seems like I get the png correctly. How do I display it in an img tag then ?
推荐答案
我已通过将块转换为base64字符串解决了该问题.然后,我将字符串传递如下:
I have solved the issue by converting the chunk into base64 string. I then passed the string as below:
const readstream = gfs.createReadStream(file.filename);
readstream.on('data', (chunk) => {
res.render('newHandlebarFile', { image: chunk.toString('base64') });
})
我在车把中渲染值,如下所示:
I render the value in handlebars as below:
<img src="data:image/png;base64,{{ image }}" alt="{{ image }}">
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