Convert int[] to byte[]?

v0fbu1vm · 2022-10-04T16:24:02.291Z

Could anyone help me convert an array of integers to an array of bytes?

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sibber•10/4/22, 4:26 PM

https://learn.microsoft.com/en-us/dotnet/api/system.buffers.binary.binaryprimitives?view=net-6.0

BinaryPrimitives Class (System.Buffers.Binary)

Reads bytes as primitives with specific endianness.

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v0fbu1vmOP•10/4/22, 4:28 PM

Would this be a good idea?

byte[] bytes = intArray.SelectMany(BitConverter.GetBytes).ToArray()

byte[] bytes = intArray.SelectMany(BitConverter.GetBytes).ToArray()

byte[] bytes = intArray.SelectMany(BitConverter.GetBytes).ToArray()

byte[] bytes = intArray.SelectMany(BitConverter.GetBytes).ToArray()

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TheRanger•10/4/22, 4:34 PM

that doesnt make sense, since byte's maximum value is 255

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TheRanger•10/4/22, 4:35 PM

what if an integer is 512 ?

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TheRanger•10/4/22, 4:35 PM

you probably want a 2d array

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sibber•10/4/22, 4:35 PM

i assume they want to convert each int to an array of bytes

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TheRanger•10/4/22, 4:37 PM

byte[][] bytes = intArray.Select(x => BitConverter.GetBytes(x)).ToArray();

byte[][] bytes = intArray.Select(x => BitConverter.GetBytes(x)).ToArray();

byte[][] bytes = intArray.Select(x => BitConverter.GetBytes(x)).ToArray();

byte[][] bytes = intArray.Select(x => BitConverter.GetBytes(x)).ToArray();

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ero•10/4/22, 5:06 PM

what they had originally makes perfect sense and works fine

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ero•10/4/22, 5:06 PM

absolutely no reason to correct that

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ero•10/4/22, 5:06 PM

unless they want a faster version

I

i love cat(mull-rom splines)•10/4/22, 5:07 PM

id allocate once and for it

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i love cat(mull-rom splines)•10/4/22, 5:07 PM

more efficient than linq

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MODiX•10/4/22, 5:18 PM

Ero#1111

REPL Result: Success

using System.Runtime.InteropServices;

int[] foo = { 1, 2, 3, 4, 5 };
byte[] bar = MemoryMarshal.AsBytes<int>(foo).ToArray();

bar

using System.Runtime.InteropServices;

int[] foo = { 1, 2, 3, 4, 5 };
byte[] bar = MemoryMarshal.AsBytes<int>(foo).ToArray();

bar

using System.Runtime.InteropServices;

int[] foo = { 1, 2, 3, 4, 5 };
byte[] bar = MemoryMarshal.AsBytes<int>(foo).ToArray();

bar

using System.Runtime.InteropServices;

int[] foo = { 1, 2, 3, 4, 5 };
byte[] bar = MemoryMarshal.AsBytes<int>(foo).ToArray();

bar

Result: byte[]

AQAAAAIAAAADAAAABAAAAAUAAAA=

AQAAAAIAAAADAAAABAAAAAUAAAA=

AQAAAAIAAAADAAAABAAAAAUAAAA=

AQAAAAIAAAADAAAABAAAAAUAAAA=

Compile: 565.667ms | Execution: 44.727ms | React with ❌ to remove this embed.

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ero•10/4/22, 5:18 PM

ah, right

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ero•10/4/22, 5:18 PM

modix turns bytes into chars

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MODiX•10/4/22, 5:19 PM

Cyberrex#8052

REPL Result: Success

using System.Runtime.InteropServices;

int[] foo = { 1, 2, 3, 4, 5 };
byte[] bar = MemoryMarshal.AsBytes<int>(foo).ToArray();

string.Join("", bar)

using System.Runtime.InteropServices;

int[] foo = { 1, 2, 3, 4, 5 };
byte[] bar = MemoryMarshal.AsBytes<int>(foo).ToArray();

string.Join("", bar)

using System.Runtime.InteropServices;

int[] foo = { 1, 2, 3, 4, 5 };
byte[] bar = MemoryMarshal.AsBytes<int>(foo).ToArray();

string.Join("", bar)

using System.Runtime.InteropServices;

int[] foo = { 1, 2, 3, 4, 5 };
byte[] bar = MemoryMarshal.AsBytes<int>(foo).ToArray();

string.Join("", bar)

Result: string

10002000300040005000

10002000300040005000

10002000300040005000

10002000300040005000

Compile: 621.330ms | Execution: 50.969ms | React with ❌ to remove this embed.

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mtreit•10/4/22, 5:36 PM

I think I would use MemoryMarshal.Cast for this.

Span<byte> bytes = MemoryMarshal.Cast<int, byte>(foo);

Span<byte> bytes = MemoryMarshal.Cast<int, byte>(foo);

Span<byte> bytes = MemoryMarshal.Cast<int, byte>(foo);

Span<byte> bytes = MemoryMarshal.Cast<int, byte>(foo);

Mmtreit I think I would use MemoryMarshal.Cast for this. ```cs Span<byte> bytes = Memor...

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TheRanger•10/4/22, 6:09 PM

ah that slipped my mind, did not think thats what they meant

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TheRanger•10/4/22, 6:10 PM

even tho i used those kinds of things in a project im working on

even tho i used those kinds of things in a project im working on

even tho i used those kinds of things in a project im working on

even tho i used those kinds of things in a project im working on