Fixed sbyte[] to string C#

Question

I'm trying to get a string from memory using StrucLayout and FieldOffset

But I'm having a lot of trouble understanding how byte works.

Here is my code ATM :

[StructLayout(LayoutKind.Explicit)]
public unsafe struct InfoDetails
{
    [FieldOffset(0x14)]
    public fixed sbyte Name[50];

    public string getName
    {
        get
        {
            fixed (sbyte* namePtr = Name)
            {
                return new string(namePtr);
            }
        }
    }
}

This code returns : T. Expected result is TEZ.

Any advices on why I'm doing it wrong ? Thanks

Answer 1

You could change the signature to:

[FieldOffset(0x14)]
public fixed char Name[25];

public string getName
{
    get
    {
        fixed (char* namePtr = Name)
        {
            return new string(namePtr);
        }
    }
}

Note how I changed sbyte to char and I halved the size of the buffer (because sizeof(char) == 2)

Or you could even, more simply add a single cast to char*:

fixed (sbyte* namePtr = Name)
{
    return new string((char*)namePtr);
}

without changing anything else.