1+ # backend.py
2+ from fastapi import FastAPI , File , UploadFile , Form
3+ from fastapi .responses import HTMLResponse , JSONResponse
4+ from fastapi .staticfiles import StaticFiles
5+ from fastapi .middleware .cors import CORSMiddleware
6+ from dynamsoft_capture_vision_bundle import *
7+ import io
8+ import os
9+
10+ app = FastAPI ()
11+
12+ # Initialize Dynamsoft components
13+ license_key = "DLS2eyJoYW5kc2hha2VDb2RlIjoiMjAwMDAxLTE2NDk4Mjk3OTI2MzUiLCJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSIsInNlc3Npb25QYXNzd29yZCI6IndTcGR6Vm05WDJrcEQ5YUoifQ=="
14+ error_code , error_message = LicenseManager .init_license (license_key )
15+ cvr_instance = CaptureVisionRouter ()
16+
17+ # Configure CORS
18+ app .add_middleware (
19+ CORSMiddleware ,
20+ allow_origins = ["*" ],
21+ allow_methods = ["*" ],
22+ allow_headers = ["*" ],
23+ )
24+
25+ # Mount static files
26+ # app.mount("/static", StaticFiles(directory="static"), name="static")
27+
28+ @app .get ("/" , response_class = HTMLResponse )
29+ async def upload_page ():
30+ return """
31+ <!DOCTYPE html>
32+ <html>
33+ <head>
34+ <title>Barcode Scanner</title>
35+ <style>
36+ .container { max-width: 600px; margin: 2rem auto; padding: 2rem; }
37+ .preview { max-width: 300px; margin: 1rem 0; }
38+ .progress { display: none; color: blue; }
39+ </style>
40+ </head>
41+ <body>
42+ <div class="container">
43+ <h1>Upload Barcode Image</h1>
44+ <input type="file" id="fileInput" accept="image/*" capture="camera">
45+ <img class="preview" id="preview">
46+ <div class="progress" id="progress">Processing...</div>
47+ <div id="result"></div>
48+
49+ <script>
50+ const fileInput = document.getElementById('fileInput');
51+ const preview = document.getElementById('preview');
52+ const progress = document.getElementById('progress');
53+ const resultDiv = document.getElementById('result');
54+
55+ fileInput.addEventListener('change', async (e) => {
56+ const file = e.target.files[0];
57+ if (!file) return;
58+
59+ // Display preview
60+ preview.src = URL.createObjectURL(file);
61+ preview.style.display = 'block';
62+
63+ // Show progress
64+ progress.style.display = 'block';
65+
66+ const formData = new FormData();
67+ formData.append('file', file);
68+
69+ try {
70+ const response = await fetch('/scan', {
71+ method: 'POST',
72+ body: formData
73+ });
74+
75+ const data = await response.json();
76+ if (data.success) {
77+ let resultHTML = `
78+ <h3>Found ${data.count} barcode(s)</h3>
79+ <div class="results-container">
80+ `;
81+
82+ data.items.forEach((item, index) => {
83+ resultHTML += `
84+ <div class="barcode-result">
85+ <h4>Barcode #${index + 1}</h4>
86+ <p><strong>Type:</strong> ${item.format}</p>
87+ <p><strong>Content:</strong> ${item.text}</p>
88+ <div class="location">
89+ <span>Coordinates:</span>
90+ <ul>
91+ <li>Point 1: (${item.location.x1}, ${item.location.y1})</li>
92+ <li>Point 2: (${item.location.x2}, ${item.location.y2})</li>
93+ <li>Point 3: (${item.location.x3}, ${item.location.y3})</li>
94+ <li>Point 4: (${item.location.x4}, ${item.location.y4})</li>
95+ </ul>
96+ </div>
97+ </div>
98+ `;
99+ });
100+
101+ resultHTML += `</div>`;
102+ resultDiv.innerHTML = resultHTML;
103+ } else {
104+ resultDiv.innerHTML = `Error: ${data.error}`;
105+ }
106+ } catch (err) {
107+ resultDiv.innerHTML = 'Request failed';
108+ } finally {
109+ progress.style.display = 'none';
110+ }
111+ });
112+ </script>
113+ </div>
114+ </body>
115+ </html>
116+ """
117+
118+ @app .post ("/scan" )
119+ async def scan_barcode (file : UploadFile = File (...)):
120+ try :
121+ # Read image file
122+ image_data = await file .read ()
123+
124+ # # Decode barcodes
125+ result = cvr_instance .capture (image_data , EnumPresetTemplate .PT_READ_BARCODES .value )
126+
127+ if result .get_error_code () != EnumErrorCode .EC_OK :
128+ return JSONResponse (
129+ {"success" : False , "error" : "No barcode detected" },
130+ status_code = 400
131+ )
132+
133+ # Get and return results
134+ items = result .get_items ()
135+ return_items = []
136+ for item in items :
137+ format_type = item .get_format ()
138+ text = item .get_text ()
139+
140+ location = item .get_location ()
141+ x1 = location .points [0 ].x
142+ y1 = location .points [0 ].y
143+ x2 = location .points [1 ].x
144+ y2 = location .points [1 ].y
145+ x3 = location .points [2 ].x
146+ y3 = location .points [2 ].y
147+ x4 = location .points [3 ].x
148+ y4 = location .points [3 ].y
149+ del location
150+
151+ return_items .append ({
152+ "format" : format_type ,
153+ "text" : text ,
154+ "location" : {
155+ "x1" : x1 ,
156+ "y1" : y1 ,
157+ "x2" : x2 ,
158+ "y2" : y2 ,
159+ "x3" : x3 ,
160+ "y3" : y3 ,
161+ "x4" : x4 ,
162+ "y4" : y4
163+ }
164+ })
165+
166+ return {
167+ "success" : True ,
168+ "count" : len (items ),
169+ "items" : return_items
170+ }
171+
172+ except Exception as e :
173+ return JSONResponse (
174+ {"success" : False , "error" : str (e )},
175+ status_code = 500
176+ )
177+
178+ if __name__ == "__main__" :
179+ import uvicorn
180+ uvicorn .run (app , host = "0.0.0.0" , port = 8000 )
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