C read / write binary file

One option for reading and writing binaries is to use stream types directly ; under these circumstances , It's best to use byte arrays to perform read and write operations . Another option is to use the readers and writers defined for this scenario ：BinaryReader and BinaryWriter. They are used in a way similar to StreamReader and StreamWriter, but BinaryReader and BinaryWriter Do not use any encoding . The file is written in binary format instead of text format .

And Stream Different types ,BinaryWriter by Write() Method defines 18 Overloaded versions . Overloaded versions accept different types , This is shown in the following code snippet , It writes double、int、long and string：

public static void WriteFileUsingBinaryWriter(string binFile)
{
  var outputStream = File.Create(binFile);
  using (var writer = new BinaryWriter(outputStream))
  {
    double d = 47.47; 
    int i = 42;
    long 1 = 987654321; 
    string s = "sample"; 
    writer.Write(d); 
    writer.Write(i); 
    writer.Write(1);
    writer.Write(s)
    }
  }

To read the file again , have access to BinaryReader. The method defined by this class will read all different types , Such as ReadDouble、ReadInt32、ReadInt64 and ReadString, As shown below ：

public static void ReadFileUsingBinaryReader(string binFile) 
{
  var inputStream = File.Open(binFile, FileMode.Open); 
  using (var reader = new BinaryReader(inputStream))
  {
    double d = reader.ReadDouble(); 
    int i = reader.ReadInt32(); 
    long l = reader.ReadInt64();
    string s = reader.ReadString();
    Console.WriteLine($"d: {d}, i: {i},l: {1},s: {s}");
  }
}

The order in which files are read must exactly match the order in which they are written . When creating your own binary format , Need to know what and how to store , And read... In the corresponding way . Old Microsoft Word The document uses binary file format , And new docx The file extension is ZIP file .

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