Socket unpacking base -c#

1. Byte [] Conversion is performed in bytes

Use the BitConverter class for the conversion.

//int a =1; Convert to 4-byte byte[] = new byte[4];
int a = 1;
byte[] rets = BitConverter.GetBytes(a); 
Console(rets.Length);			// The result is 4
Copy the code

API documentation: BitConverter class (System) | Microsoft Docs

2. Convert string to byte[]

The API documentation: Encoding (System. Text) | Microsoft Docs

3. Array Copy between arrays

// Here we concatenate agreement, childAgreement, bytes into a content
/ / agreement 4 bytes
/ / childAgreement 4 bytes
/ / bytes 4 bytes
/ / the content of 12 bytes

byte[] agreement = BitConverter.GetBytes(1);         //CAXADNC Siemens data protocol
byte[] childAgreement = BitConverter.GetBytes(1);           // Siemens Data Protocol Version 1
byte[] bytes = BitConverter.GetBytes(7);          / / command

byte[] content = new byte[12];           // The entire command content

Array.Copy(agreement, 0, content, 0.4);
Array.Copy(childAgreement, 0, content, 4.4);
Array.Copy(bytes, 0, content, 7.4);
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The API documentation: Array. (the System) | Microsoft Docs Copy method

4. Conversion between Struct and byte[]

Reference: byte alignment, conversion operations and copying to binary data for structs in C# (byte[])

5. Obtain Struct structure size

Use Marshal.SizeOf Method to get the number of bytes of Struct.

The API documentation:

Marshal.SizeOf Method

The use of MarshalAs

Marshalling .NET generic types

When communicating with structs of other languages:

C# call C++DLL pass structure array ultimate solution _ learn and learn -CSDN blog

C# receive C/C++DLL structure nested array and multidimensional array solution _ learn and learn -CSDN blog

A simple summary of MarshalAs _ Iron Man -CSDN blog

Classic:

Use of MarshalAs _ development is zigzag but also forward -CSDN blog

Use the Signature Tool to automatically generate P/Invoke to call Windows API C# function declaration _Donjuan column -CSDN blog

A good tool to recommend :P/Invoke Interop Assistant

c# – Easiest way to generate P/Invoke code? – Stack Overflow

Download address:

PInvokeInteropAssistant.zip – making blue cloud (lanzoui.com)

6. Byte [] and hexadecimal character string

Refer to blog post:

C# byte arrays convert hexadecimal strings to each other

C# and c++ type comparison table

Reference:

C# and C++ data type comparison table – kuiblog.com

C++ and C# data structure type mapping table – sunrack – cnblogs.com

C/C # data type mapping – Lazyman – Cnblogs.com