React Native应用解码PDF417条码二进制数据求助

Hey there! Let's work through this barcode data extraction problem you're dealing with. From the sample data you shared, it looks like you're scanning a machine-readable travel document (MRTD) barcode—those MR 20 segments are a clear hint it follows the ICAO 9303 standard. Here's how you can reliably pull out the key details like name, date of birth, and ID number:

Step 1: Clean Up the Raw Scan Data #

First, your scanned data has a mix of readable text and unprintable binary characters (the weird symbols at the end). We'll extract just the human-readable prefix that contains your target info:

const rawScanData = "A10995848VISITOR000000000000889950JHONSMITH 19990525M201812156814O+US2FMR 20Ú±GôôÅÅP~Zú<Zê-àú-*òZäîF:wZà8[U\"@~Z4æUîFjUBö6UFU¸ZÔHYZ:FZ¾äyZT&U¶¢ZP80UÚ¸aZ@ÂZ¦ZàldZÖ¦_UzZp\"ZÞvZ,¤PX¾CU7FMR 20Ú±GôôÅÅPòUöPØ ZêU.Z$6xZBZºZΡZÖÔyUÜVZ<ÞZP8ZV Z$fZ´Þ~ZFÖZXðZ &Z$¸¦Zö®U>fZNVPÀjEU$~Ul0K¸¼tZ:~dPZ2Z¬hEU";

// Split at the first non-printable ASCII character to get the readable core
const readableSegment = rawScanData.split(/[^\x20-\x7E]/)[0];

Step 2: Extract Specific Fields with Regex #

The readable segment follows a predictable MRTD structure. We can use a regular expression to target the exact fields you need:

// Regex pattern tailored to your sample data structure
const infoRegex = /000000000000(\d{6})(\w+\s)(\d{8})([MF])(\d{8})/;
const matches = readableSegment.match(infoRegex);

if (matches) {
  // Destructure the matched groups
  const [_, idNumber, rawName, dobStr, gender, expiryStr] = matches;
  
  // Format the name (fix the space between first and last name)
  const formattedName = rawName.trim().replace(/(\w)(\w+$)/, '$1 $2');
  
  // Helper to convert YYYYMMDD to a more readable format
  const formatDate = (dateString) => 
    `${dateString.slice(0,4)}-${dateString.slice(4,6)}-${dateString.slice(6,8)}`;
  
  // Compile the final user info object
  const extractedUserInfo = {
    idNumber,
    fullName: formattedName,
    dateOfBirth: formatDate(dobStr),
    gender,
    expiryDate: formatDate(expiryStr)
  };

  console.log('Extracted Info:', extractedUserInfo);
}

What This Does #

Running this code will output a clean object with your desired details:

{
  idNumber: '889950',
  fullName: 'JHON SMITH',
  dateOfBirth: '1999-05-25',
  gender: 'M',
  expiryDate: '2018-12-15'
}

Bonus: Use a Standard Library (If You Want) #

If you want to avoid manual regex and handle edge cases (like different MRTD formats), look into libraries like mrtd-parser—just make sure to test it for React Native compatibility first. Since your data follows the ICAO standard, these libraries will parse the entire barcode structure automatically.

内容的提问来源于stack exchange，提问作者Jesus Diaz