Multer Node.js（开发者如何使用）

npm install multer
npm install express

'INSTANT VB TODO TASK: The following line uses invalid syntax:
'npm install multer npm install express

const express = require('express');
const multer = require('multer');
const path = require('path');
const fs = require('fs');
// Initialize Express
const app = express();
// Set up storage configuration for Multer
const storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, 'uploads/'); // Directory to save uploaded files
  },
  filename: (req, file, cb) => {
    const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
    cb(null, file.fieldname + '-' + uniqueSuffix + path.extname(file.originalname)); // Unique filename
  }
});
// Configure file filter function to allow only certain file types
const fileFilter = (req, file, cb) => {
  const allowedFileTypes = /jpeg
jpg
png
gif/;
  const mimetype = allowedFileTypes.test(file.mimetype);
  const extname = allowedFileTypes.test(path.extname(file.originalname).toLowerCase());
  if (mimetype && extname) {
    return cb(null, true);
  } else {
    cb(new Error('Only images are allowed!'));
  }
};
// Initialize Multer with storage, file size limit, and file filter options
const upload = multer({
  storage: storage,
  limits: { fileSize: 1024 * 1024 * 5 }, // 5 MB file size limit
  fileFilter: fileFilter
});
// Single file upload route
app.post('/upload-single', upload.single('profilePic'), (req, res) => {
  try {
    res.send('Single file uploaded successfully');
  } catch (err) {
    res.status(400).send({ error: err.message });
  }
});
// Multiple files upload route
app.post('/upload-multiple', upload.array('photos', 5), (req, res) => {
  try {
    res.send('Multiple files uploaded successfully');
  } catch (err) {
    res.status(400).send({ error: err.message });
  }
});
// Error handling middleware
app.use((err, req, res, next) => {
  if (err) {
    res.status(400).send({ error: err.message });
  }
});
// Start the server
const PORT = process.env.PORT 
 3000;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});

Private const express = require( 'express');
Private const multer = require( 'multer');
Private const path = require( 'path');
Private const fs = require( 'fs');
' Initialize Express
Private const app = express()
' Set up storage configuration for Multer
Private const storage = multer.diskStorage({ destination:= (req, file, cb) =>
	cb(Nothing, 'uploads/');
'INSTANT VB TODO TASK: Lambda expressions and anonymous methods are not converted by Instant VB if local variables of the outer method are referenced within the anonymous method:
, filename: (req, file, cb) =>
' Configure file filter function to allow only certain file types
'INSTANT VB TODO TASK: Lambda expressions and anonymous methods are not converted by Instant VB if local variables of the outer method are referenced within the anonymous method:
const fileFilter = (req, file, cb) =>
If True Then
'INSTANT VB WARNING: Instant VB cannot determine whether both operands of this division are integer types - if they are then you should use the VB integer division operator:
  const allowedFileTypes = /jpeg jpg png gif/
  const mimetype = allowedFileTypes.test(file.mimetype)
  const extname = allowedFileTypes.test(path.extname(file.originalname).toLowerCase())
  If mimetype AndAlso extname Then
	Return cb(Nothing, True)
  Else
	cb(New [Error]( 'Only images are allowed!'));
  End If
End If
' Initialize Multer with storage, file size limit, and file filter options
const upload = multer({
	storage:= storage,
	limits:= { fileSize:= 1024 * 1024 * 5 },
	fileFilter:= fileFilter
})
' Single file upload route
app.post( '/upload-@single', upload.@single('profilePic'), (req, res) =>
If True Then
	Try
		res.send( 'Single file uploaded successfully');
	Catch e1 As err
		res.status(400).send({ [error]:= err.message })
	End Try
End If
)
' Multiple files upload route
app.post( '/upload-multiple', upload.array('photos', 5), (req, res) =>
If True Then
	Try
		res.send( 'Multiple files uploaded successfully');
	Catch e2 As err
		res.status(400).send({ [error]:= err.message })
	End Try
End If
)
' Error handling middleware
'INSTANT VB TODO TASK: Lambda expressions and anonymous methods are not converted by Instant VB if local variables of the outer method are referenced within the anonymous method:
app.use((err, req, res, [next]) =>
' Start the server
const PORT = process.env.PORT 3000
'INSTANT VB TODO TASK: Lambda expressions and anonymous methods are not converted by Instant VB if local variables of the outer method are referenced within the anonymous method:
app.listen(PORT, () =>

npm install @ironsoftware/ironpdf

'INSTANT VB TODO TASK: The following line uses invalid syntax:
'npm install @ironsoftware/ironpdf

const express = require('express');
const multer = require('multer');
const path = require('path');
const IronPdf = require("@ironsoftware/ironpdf");
const document=IronPdf.PdfDocument;
var config=IronPdf.IronPdfGlobalConfig
// Initialize Express
const app = express();
// Set up Multer storage configuration
const storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, 'uploads/'); // Directory to save uploaded files
  },
  filename: (req, file, cb) => {
    cb(null, `${Date.now()}-${file.originalname}`); // Unique filename
  }
});
const upload = multer({ storage: storage });
// Single file upload route
app.post('/upload-single', upload.single('file'), async (req, res) => {
  try {
    // Read the uploaded file
    const filePath = path.join(__dirname, 'uploads', req.file.filename);
      // Create HTML content for PDF
      const htmlContent = `
        <html>
          <head>
            <title>Uploaded File Content</title>
          </head>
          <body>
            <h1>Uploaded File Content</h1>
            <img src="${filePath}" alt="image" width="500" height="600">
          </body>
        </html>
      `;
    // Initialize IronPDF
    const pdf = await document.fromHtml(htmlContent);
    // Save PDF to file
    const pdfPath = path.join(__dirname, 'uploads', `${Date.now()}-output.pdf`);
    await pdf.saveAs(pdfPath);
    // Respond to the client
    res.send(`File uploaded and PDF generated successfully! <a href="/download-pdf?path=${pdfPath}">Download PDF</a>`);
  } catch (err) {
    res.status(500).send({ error: err.message });
  }
});
// Route to download generated PDF
  app.get('/download-pdf', (req, res) => {
    const filename = req.query.filename;
    const pdfPath = path.join(__dirname, 'uploads', filename);
    res.download(pdfPath);
  });
// Start the server
const PORT = process.env.PORT 
 3000;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});

const express = require( 'express');
const multer = require( 'multer');
const path = require( 'path');
const IronPdf = require("@ironsoftware/ironpdf")
const document=IronPdf.PdfDocument
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: var config=IronPdf.IronPdfGlobalConfig const app = express();
IronPdf.IronPdfGlobalConfig Const app = express()
Dim config As Dim=IronPdf.IronPdfGlobalConfig Const app
' Set up Multer storage configuration
'INSTANT VB TODO TASK: Lambda expressions and anonymous methods are not converted by Instant VB if local variables of the outer method are referenced within the anonymous method:
const storage = multer.diskStorage({ destination:= (req, file, cb) =>
If True Then
	cb(Nothing, 'uploads/');
End If
'INSTANT VB TODO TASK: Lambda expressions and anonymous methods are not converted by Instant VB if local variables of the outer method are referenced within the anonymous method:
, filename: (req, file, cb) =>
const upload = multer({ storage:= storage })
' Single file upload route
app.post( '/upload-@single', upload.@single('file'), async(req, res) =>
If True Then
	Try
		const filePath = path.join(__dirname, 'uploads', req.file.filename);
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: const htmlContent = ` <html> <head> <title> Uploaded File Content</title> </head> <body> <h1> Uploaded File Content</h1> <img src="${filePath}" alt="image" width="500" height="600"> </body> </html> `;
		"500" height="600"> </body> </html> `
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: const htmlContent = ` <html> <head> <title> Uploaded File Content</title> </head> <body> <h1> Uploaded File Content</h1> <img src="${filePath}" alt="image" width="500" height
		"image" width="500" height
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: const htmlContent = ` <html> <head> <title> Uploaded File Content</title> </head> <body> <h1> Uploaded File Content</h1> <img src="${filePath}" alt="image" width
		"${filePath}" alt="image" width
'INSTANT VB TODO TASK: The following line contains an assignment within expression that was not extracted by Instant VB:
'ORIGINAL LINE: const htmlContent = ` <html> <head> <title> Uploaded File Content</title> </head> <body> <h1> Uploaded File Content</h1> <img src="${filePath}" alt
		const htmlContent = ` (Of html) (Of head) (Of title) Uploaded File Content</title> </head> (Of body) (Of h1) Uploaded File Content</h1> <img src="${filePath}" alt
		const pdf = Await document.fromHtml(htmlContent)
		const pdfPath = path.join(__dirname, 'uploads', `${@Date.now()}-output.pdf`);
		Await pdf.saveAs(pdfPath)
'INSTANT VB TODO TASK: The following line contains an assignment within expression that was not extracted by Instant VB:
'ORIGINAL LINE: res.send(`File uploaded and PDF generated successfully! <a href="/download-pdf?path=${pdfPath}"> Download PDF</a>`);
		res.send(`File uploaded [and] PDF generated successfully!<a href="/download-pdf?path=${pdfPath}"> Download PDF</a>`)
	Catch e1 As err
		res.status(500).send({ [error]:= err.message })
	End Try
End If
)
' Route to download generated PDF
  app.get( '/download-pdf', (req, res) =>
  If True Then
	  const filename = req.query.filename
	  const pdfPath = path.join(__dirname, 'uploads', filename);
	  res.download(pdfPath)
  End If
  )
' Start the server
const PORT = process.env.PORT 3000
'INSTANT VB TODO TASK: Lambda expressions and anonymous methods are not converted by Instant VB if local variables of the outer method are referenced within the anonymous method:
app.listen(PORT, () =>