javascript 如何在 node.js 中将二进制缓冲区解码为图像？
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How to decode a binary buffer to an image in node.js?
提问by Sarodh Uggalla
I'm receiving an image in a binary stream as shown below, however when I try to create a buffer with the following data the buffer appears to be empty. Is the problem that buffer doesn't understand this format?
我正在接收二进制流中的图像，如下所示，但是当我尝试使用以下数据创建缓冲区时，缓冲区似乎是空的。是不是buffer看不懂这种格式的问题？
V?q)?EB\u001599!F":"????\u000b??3??5%?L?\u0018??pO^::?~??m?<\u001e??L??k?%G?$b\u0003\u0011???=q?V=??A\u0018??O??U???m?B???\u00038?????0a?_??#\u001b????\f??(?3?\u0003???nGjr???Mt\?\u0014g????~?#?Q?? g?K??s??@C??\u001cS?`\u000bps?Gnzq?Rg?\fu???C\u0015?\u001d3?E.BI\u0007???
V?q)?EB\u001599!F":"????\u000b??3??5%?L?\u0018??pO^::?~??m?<\u001e??L? ?k?%G?$b\u0003\u0011???=q?V=??A\u0018??O??U???m?B???\u00038???0a?_ ??#\u001b????\f??(?3?\u0003???nGjr???Mt\?\u0014g????~?#?Q??g?K??s?? @C??\u001cS?`\u000bps?Gnzq?Rg?\fu???C\u0015?\u001d3?E.BI\u0007???
var buffer = new Buffer(req.body, 'binary')
console.log("BUFFER:" + buffer)
fs.writeFile('test.jpg', buffer, function(err,written){
if(err) console.log(err);
else {
console.log("Successfully written");
}
});
采纳答案by Sarodh Uggalla
Problem was body-parser doesn't parse content-type: octet-stream and I was overriding the header to parse it as an url-encoded-form which the buffer didn't understand even though I was able to log the req.body. The middleware below allows for the parsing of content-type: octet-stream for body-parser.
问题是 body-parser 不解析 content-type: octet-stream 并且我正在覆盖标头以将其解析为 url-encoded-form，即使我能够记录 req.body，缓冲区也不理解该格式. 下面的中间件允许解析 content-type：body-parser 的 octet-stream。
app.use(function(req, res, next) {
var contentType = req.headers['content-type'] || ''
var mime = contentType.split(';')[0];
// Only use this middleware for content-type: application/octet-stream
if(mime != 'application/octet-stream') {
return next();
}
var data = '';
req.setEncoding('binary');
req.on('data', function(chunk) {
data += chunk;
});
req.on('end', function() {
req.rawBody = data;
next();
});
});
回答by berthni
I think you should set the encoding when you call fs.writeFile like this :
我认为您应该在像这样调用 fs.writeFile 时设置编码：
fs.writeFile('test.jpg', buffer, 'binary', function(err) {
