C++ Hex String轉Byte Array用法及代碼示例

// C++ Program to illustrate how to covert a hex string to a 
// byte array 
#include <iostream> 
#include <string> 
#include <vector> 
using namespace std; 
  
// Function to convert a hex string to a byte array 
vector<uint8_t> 
hexStringToByteArray(const string& hexString) 
{ 
    vector<uint8_t> byteArray; 
  
    // Loop through the hex string, two characters at a time 
    for (size_t i = 0; i < hexString.length(); i += 2) { 
        // Extract two characters representing a byte 
        string byteString = hexString.substr(i, 2); 
  
        // Convert the byte string to a uint8_t value 
        uint8_t byteValue = static_cast<uint8_t>( 
            stoi(byteString, nullptr, 16)); 
  
        // Add the byte to the byte array 
        byteArray.push_back(byteValue); 
    } 
  
    return byteArray; 
} 
  
int main() 
{ 
    string hexString1 = "2f4a33"; 
    vector<uint8_t> byteArray1 
        = hexStringToByteArray(hexString1); 
  
    // Print the input and output 
    cout << "Input Hex String: " << hexString1 << endl; 
    cout << "Output Byte Array: "; 
    for (uint8_t byte : byteArray1) { 
        cout << static_cast<int>(byte) << " "; 
    } 
  
    return 0; 
}