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[英]Nativescript uploading an image on a nodejs server that uses formidable to handle inputs
[英]Formidable/NodeJS HTTP Server JPG save
Stackoverflow JS 天才的!
我当前的项目有一个问题,它使用节点的 HTTP createServer,使用 Formidable 来解析正文数据。
请参阅下面的代码。 (http-listener.js)
var listenport = 7200;
const server = http.createServer((req, res) => {
// Set vars ready
var data = '';
var plateImg = '';
var overview1 = '';
var overview2 = '';
new formidable.IncomingForm().parse(req)
// I originally thought it was sent in files, but it isnt, it's fields.
.on('file', function(name, file) {
console.log('Got file:', name);
})
// This is the correct procedure for my issue.
.on('field', function(name, field) {
console.log('Got a field:', name);
if(name.toLowerCase() === "anpr.xml")
{
// DO PARSE INTO JSON! This works, all is well.
xml2js.parseString(field, {explicitArray:false, ignoreAttrs:true}, function (err, result)
{
if(err)
{
alert('Parse: '+err);
}
// Console log parsed json data.
console.log("Read: "+result.EventNotificationAlert.ANPR.licensePlate);
console.log(result);
data = result;
});
}
if(name.toLowerCase() === "licenseplatepicture.jpg")
{
plateImg = field
// This doesnt work?
// I need to store these fields as an image. ? Is this possible with it being sent as a field and not as a file upload.
// This is the only option I have as I can't control the client sending this data (It's a camera)
fs.writeFile(config.App.ImageDir+'/Plate.jpg', plateImg, function(err) {
if(err)console.log(err);
});
}
if(name.toLowerCase() === "detectionpicture.jpg")
{
if(overview1 == '')
{
overview1 = field;
}
else if(overview2 == '')
{
overview2 = field;
}
else
{
// do nothing else.
console.log("Couldn't send images to variable.");
}
}
})
.on('error', function(err) {
alert(err);
})
.on('end', function() {
// Once finished, send to ANPR data to function to handle data and insert to database. WORKS
// Call anpr function.
ANPR_ListenData(data, plateImg, overview1, overview2, function(result) {
if(result.Status > 0)
{
console.log("Accepted by: "+result.Example);
// reset var
data = '';
plateImg = '';
overview1 = '';
overview2 = '';
res.writeHead(200, {'content-type':'text/html'});
res.end();
}
});
});
});
server.listen(listenport, () => {
console.log('ANPR Server listening on port: ' + listenport);
});
基本上是在字段中发送的图像: licenseplatepicture.jpg 等我想将它们直接存储到我的应用程序图像目录中。
不幸的是,由于它是网络摄像机,我无法控制如何将块发送到该服务器,我只需要编写一个程序。
完整的请求块非常大,所以我将文件上传到 OneDrive 以供您查看和理解请求。
对此的任何帮助将不胜感激。 我已经尝试了所有我能想到的东西,但文件保存不可读:(。除了我已经做过和尝试过的事情之外,我不知道还能去哪里看或还能尝试什么。
请求文本文件: https://1drv.ms/t/s?AqAIyFoqrBTO6hTwCimcHDHODqEi?e=pxJY00
瑞安。
我通过使用 Busboy package 而不是 Formidable 解决了这个问题。
这就是我的 http 监听器在使用 Busboy 时的样子。
var inspect = util.inspect;
var Busboy = require('busboy');
http.createServer(function(req, res) {
if (req.method === 'POST') {
//vars
var ref = Math.random().toString(36).substring(5) + Math.random().toString(36).substring(2, 15);;
var xml = '';
var parseXml = '';
var over1, over2 = '';
var i = 0;
var busboy = new Busboy({ headers: req.headers });
busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
console.log('File [' + fieldname + ']: filename: ' + filename + ', encoding: ' + encoding + ', mimetype: ' + mimetype);
if(filename.toLowerCase() === "licenseplatepicture.jpg")
{
var saveTo = config.App.ImageDir+"/"+ref+"_Plate.jpg";
if (!fs.existsSync(saveTo)) {
//file exists
file.pipe(fs.createWriteStream(saveTo));
}
}
if(filename.toLowerCase() === "detectionpicture.jpg")
{
i++;
var saveTo = config.App.ImageDir+"/"+ref+"_Front_"+i+".jpg";
if (!fs.existsSync(saveTo)) {
//file exists
file.pipe(fs.createWriteStream(saveTo));
}
}
file.on('data', function(data) {
if(filename.toLowerCase() === "anpr.xml")
{
xml += data;
}
console.log('File [' + fieldname + '] got ' + data.length + ' bytes');
});
file.on('end', function() {
console.log('File [' + fieldname + '] Finished');
});
});
busboy.on('field', function(fieldname, val, fieldnameTruncated, valTruncated, encoding, mimetype) {
console.log('Field [' + fieldname + ']: value: ' + inspect(val));
// No fields according to busboy
});
busboy.on('finish', function() {
// DO PARSE INTO JSON! This works, all is well.
xml2js.parseString(xml, {explicitArray:false, ignoreAttrs:true}, function (err, result)
{
if(err)
{
alert('Parse: '+err);
}
// Set parsed var
parseXml = result;
});
var images = '';
if(i = 2)
{
images = `{"Plate":"${ref}_Plate.jpg", "Front":"${ref}_Front_1.jpg", "Overview":"${ref}_Front_2.jpg"}`;
} else {
images = `{"Plate":"${ref}_Plate.jpg", "Front":"${ref}_Front_1.jpg", "Overview":"null"}`;
}
// Once parsed, send on to ANPR listen function.
ANPR_ListenData(ref, parseXml, images, function(result) {
if(result.Status == 1)
{
console.log('Data transfered for: '+parseXml.EventNotificationAlert.ANPR.licensePlate);
console.log('Accepted Camera: '+result.Example);
res.writeHead(200, { Connection: 'close', Location: '/' });
res.end();
}
});
});
req.pipe(busboy);
}
}).listen(7200, function() {
console.log('Listening for requests');
});
希望这对将来的其他人有所帮助。 肯定给我浪费了很多时间。
Busboy 是更好的 package,当我更多地阅读它时,它对我试图实现的目标更有意义。
瑞恩:)。 一切顺利。
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