学步园

写文件有时需要进行进制的转换，下面一个例子是十进制转十六进制，并写入文件。这里用到了进制的转换和C#文件写入的知识。
十进制转十六进制的方法：

    public class HexadecimalConversion
    {
        public static void WriteBinaryFile(UInt32 data, BinaryWriter fileBinary)//十进制转十六进制
        {
            byte ch1, ch2, ch3, ch4;

            ch1 = Convert.ToByte(data % 256);   //低一位

            ch2 = Convert.ToByte((data / 256) % 256);  //低高位

            ch3 = Convert.ToByte((data / 256 / 256) % 256); //高一位

            ch4 = Convert.ToByte((data / 256 / 256 / 256) % 256); //高高位

            fileBinary.Write(ch1);

            fileBinary.Write(ch2);

            fileBinary.Write(ch3);

            fileBinary.Write(ch4);
        }
    }

 调用转换，并写入文件：

    class Program
    {
        static void Main(string[] args)
        {
            string filepath = @"F:\test.my";

            UInt32 testData = 100;

            FileStream fileStream = null;

            BinaryWriter binaryWriter = null;
            try
            {
                if (!File.Exists(filepath))
                {
                    using (File.Create(filepath)) { }
                }

                fileStream = new FileStream(filepath, FileMode.Open);

                binaryWriter = new BinaryWriter(fileStream, System.Text.Encoding.GetEncoding("GBK"));

                fileStream.Seek(0, SeekOrigin.Begin);

                HexadecimalConversion.WriteBinaryFile(testData, binaryWriter);
            }
            catch
            {
            }
            finally
            {
                if (fileStream != null)
                {
                    fileStream.Close();
                }

                if (binaryWriter != null)
                {
                    binaryWriter.Close();
                }

            }
        }
    }

运行后，用UE打开文件可以看到已经将100转换为十六进制了：