C# data type conversion between different platforms - using sizeof(type) vs using predefined lengts

Please correct me if my question's title is incorrect in some way.

Here is my issue. Let's say I have a UDP server, written in C# running inside Unity build, on a Windows machine. Then I have a UDP client running inside a Unity build on a Linux/Java(Android) machine. I am using the System.Sockets library for both server and client.

I have a function called WriteInt(int data) on both server and client, which is used to write 4 bytes into the network stream for example . Of course this fuction writes exactly 4 bytes , using an int literal intLength = 4; I have seen from this article ( spoiler - not familiar with C ) : https://www.tutorialspoint.com/cprogramming/c_data_types.htm that C handles ints in two different ways : 4 bytes ( Integer32 in C#.System ) and 2 bytes ( Integer16 in C#.System). In case I have the function ReadInt() in my C# script ( in Unity ) , and I gave that function a variable length of 4 , it would always read 4 bytes. What if the network stream on the Linux client receives 4 bytes , which is supposed to be (C#) Integer32) ... How would it know to read C# int = 4 bytes or C# short = 2 bytes . Right here I would be ok , I think , because I have set the default byte size for int ( C#). What if I was using sizeof(int)? Would that make any difference in different platforms ? Hereby , the question is more about how Unity handles those kind of operations between different platforms. It is not about just int or bool( Java for example ) .

 

link that you attached is about C not C#.
in C# int is always 4 bytes. On all platforms.
take a look at this doc
https://docs.microsoft.com/en-us/do...eference/builtin-types/integral-numeric-types

 

@VolodymyrBS thanks for you response. As I am aware - Linux is written in 'C'.So if it would receive 4 bytes for an `C# int` lets say , but it wouldn't know how to deal with those 4 bytes ... is it 2 times 2 bytes ( 2 shorts ) or 1 int (4 bytes ) .. This is just an example. As i have said - it is a question which is interested in how Unity distributes different kinds of bytes amongst different platforms.

 

And of course , we are not only speaking about Linux and 'C', lets say Java treats bools as bits .

 

Sorry but what has this to do with anything? C# and the CLR is a standard that is the same regardless of the platform, the CPU architecture or anything else. a System.Int32 (alias "int") is always a 32 bit integer, always. Your C# code that is "reading" or "writing" data to a stream does the exact same thing on all platforms. There are not several versions of compilers. Also unlike C or C++ you can not change what the identifier "int" refers to. It's always a 32 bit integer. I'm not sure what else to say. VolodymyrBS already said this and you ignored it. So I'm not sure what else there is to it.