javascript – 如何在不保存本地的情况下将可读图像流转换为base64

我想将azure中的图像转换为base64.如何使用azure-storage包实现这一目标？

this.blobService.getBlobProperties(
                'container',
                path,
                (err, properties, status)=> {
                    if (err) {
                         res.send(502, "Error fetching file: %s", err.message);
                    } else if (!status.isSuccessful) {
                        res.send(502, "The file %s does not exist", fileName)
                    } else {
                         res.header('Content-Type', properties['contentType']);
                         this.blobService.createReadStream('container', path,(error,response)=>{
                         }).pipe(res);
                    }
                });

我得到的响应是这样的,我想将此(八位字节/流)转换为base64.

解决方法:

尝试

var dataUrl =“data：image / png; base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAA ..”;
 var buffer = new Buffer(dataUrl.split(“,”)[1],’base64′);