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HunterIDHelper.cs

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+using System.Text;
+
+namespace MHFCharacterIDConverter
+{
+    public static class HunterIDHelper
+    {
+        public static string UIntIDToInGameID(uint Id)
+        {
+            string base32String = MHFBase32Converter.ToBase32((int)Id);
+            string inGameID = Base32StringToInGameID(base32String);
+            return inGameID;
+        }
+
+        public static uint InGameIDToUIntID(string inGameID)
+        {
+            string base32String = InGameIDToBase32String(inGameID);
+            uint Id = (uint)MHFBase32Converter.FromBase32(base32String);
+            return Id;
+        }
+
+
+        static string Base32StringToInGameID(string str)
+        {
+            string result = "";
+            for (int i = str.Length - 1; i >= 0; i--)
+            {
+                result += str[i];
+            }
+
+            while (result.Length < 6)
+            {
+                result += "1";
+            }
+            return result;
+        }
+
+
+        static string InGameIDToBase32String(string str)
+        {
+            string result = "";
+            for (int i = 0; i < str.Length; i++)
+                result = str[i] + result;
+
+            List<char> temp = result.ToList();
+
+            result = "";
+
+            bool bhadfristVal = false;
+            for (int i = 0; i < temp.Count; i++)
+            {
+                if (!bhadfristVal && temp[i] == '1')
+                    continue;
+                bhadfristVal = true;
+                result += temp[i];
+            }
+
+            return result;
+        }
+    }
+
+    public static class MHFBase32Converter
+    {
+        private const string Base35Chars = "123456789ABCDEFGHJKLMNPQRTUVWXYZ"; // 35个字符，从'1'到'Z'  
+
+        // 整数转换为35进制字符串（自定义的，其中'1'代表0）  
+        public static string ToBase32(int number)
+        {
+
+            StringBuilder result = new StringBuilder();
+            while (number > 0)
+            {
+                int remainder = number % 32;
+                result.Insert(0, Base35Chars[remainder]); // 注意这里不需要减1，因为直接从'1'开始  
+                number /= 32;
+            }
+
+            // 如果number是0，则添加'1'表示  
+            if (result.Length == 0)
+            {
+                result.Append(Base35Chars[0]);
+            }
+
+            return result.ToString();
+        }
+
+        // 35进制字符串转换为整数（自定义的，其中'1'代表0）  
+        public static int FromBase32(string base32String)
+        {
+            if (string.IsNullOrWhiteSpace(base32String)) throw new ArgumentNullException(nameof(base32String));
+
+            int result = 0;
+            int power = 1;
+
+            for (int i = base32String.Length - 1; i >= 0; i--)
+            {
+                char currentChar = base32String[i];
+                int index = Base35Chars.IndexOf(currentChar);
+
+                if (index == -1)
+                {
+                    throw new ArgumentException("Invalid character in base32 string.");
+                }
+
+                // 如果第一个字符是'1'，则不需要加1，因为'1'代表0  
+                result += (i == 0 && currentChar == '1' ? 0 : index) * power;
+                power *= 32;
+            }
+
+            return result;
+        }
+
+    }
+}

MHFCharacterIDConverter.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <PublishAot>true</PublishAot>
+    <InvariantGlobalization>true</InvariantGlobalization>
+  </PropertyGroup>
+
+</Project>

Program.cs

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+namespace MHFCharacterIDConverter
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            //Test
+            for (uint i = 1; i < 1300u; i++)
+            {
+                string InGameID = HunterIDHelper.UIntIDToInGameID(i);
+                uint reConvID = HunterIDHelper.InGameIDToUIntID(InGameID);
+                Console.WriteLine($"srcCharID:  {i}   | InGameID:   {InGameID}  |   reConvID:   {reConvID}");
+            }
+            Console.ReadLine();
+        }
+    }
+}

README.md

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+##[Cn]
+
+在Monster Hunter Frontier （任意版本） 中，浏览角色信息，有一个ID，形如"W6BX11"，这种六位数。
+
+通过查看服务端代码和截取包，发现服务器仅发送了uint32的数据库的CharacterID，并没有发送"W6BX11"这种字符串。
+
+这完全是客户端逻辑，为了不显示真实ID，做了一个换算。
+
+我搞清楚了其换算机制，机制如下：
+
+1. MHF客户端是基于0~Z的36进制，但是把‘0’、‘I’、‘O’、‘S’ 这四个字符扔了，变成32进制。
+
+2. 从0到32的数值，对应的表示符号是“123456789ABCDEFGHJKLMNPQRTUVWXYZ”
+
+3. 按照如上对应表，把uint32的CharacterID进行转换之后。
+
+4. 将结果倒序,(并不是HEX的高位在前，是直接整个字符串倒序）
+
+5. 然后不足6位填充“1”，因为“1”就是0
+
+相反的行为，换算回去
+
+已用于皓月云MHF-FW5在线网页游戏实况的需要内存采集的一部分功能。
+
+##[En] 
+
+In Monster Hunter Frontier (any version), when browsing character information, there is an ID in the form of "W6BX11", a six-digit number.
+
+By checking the server code and intercepting the package, it was found that the server only sent the CharacterID of the uint32 database, and did not send the string "W6BX11".
+
+This is completely client logic. In order not to display the real ID, a conversion was made.
+
+I figured out its conversion mechanism, which is as follows:
+
+1. The MHF client is based on 36-decimal system 0~Z, but the four characters '0', 'I', 'O', and 'S' are thrown away and converted to 32-decimal system.
+
+2. The corresponding symbols for the values ​​from 0 to 32 are "123456789ABCDEFGHJKLMNPQRTUVWXYZ"
+
+3. According to the corresponding table above, convert the CharacterID of uint32.
+
+4. Reverse the result (not the high bit of HEX first, but the whole string in reverse order)
+
+5. Then fill "1" if there are less than 6 bits, because "1" is 0
+
+The opposite behavior, convert back
+
+It has been used for some functions of axibug.com MHF-FW5 online web game live that require memory acquisition.