How to convert byte array to int32

Question

Please help me to convert byte array in to int32 using c#.

I used the following code but did not get the exact value

byte[] newArray3 = new[] { buffer[m+2], buffer[m+3], buffer[m], buffer[m+1] }; 
int t = BitConverter.ToInt32(newArray3,0);

Thanks in advance.

      *15 14 13 12 11 10 9 8* * 7 6 5 4 3 2 1 0**

Word1 ...S msb ....buffer[m+1].. . .........buffer[m].................

word2 .....buffer[m+3]............................buffer[m+2]......... lsb

Similar question: Efficient way to read big endian data in C# — CodesInChaos
– CodesInChaos, Commented Feb 20, 2014 at 16:47
What are the values in buffer[m] through buffer[m+3], and what do you expect the returned value to be? — Jim Mischel
– Jim Mischel, Commented Feb 20, 2014 at 17:28

LB2 · Accepted Answer · 2014-02-20 16:45:00Z

4

use bitshifting instead

m[0] << 24 || m[1] << 16 || m[2] << 8 || m[3]

assumes m[0] contains MSB...

answered Feb 20, 2014 at 16:45

LB2

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Comments

Luaan · Accepted Answer · 2014-02-20 16:46:37Z

2

Unless you need to change the MSB position, use

BitConverter.ToInt32(buffer, m);

There's no need to copy the data to another byte array in-between.

If you do need to change the endianness, you're stuck with using bitshifting as LB2 suggested above.

answered Feb 20, 2014 at 16:46

Luaan

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@CodesInChaos You can always check if the hardware is the endianness you want and only use the manual bit ORing if it doesn't suit your needs.