Marshaling a c char array[128] to c#
c#, dll, interop, marshalling, struct
Solution
The size would be 64, since 64 2-byte quantities have the same size as 128 1-byte ones.
I'd use a byte array for marshaling because otherwise you'll have to put up with splitting values in order to get the C chars (which are single bytes).
Problem
Simple question, but I can't find a straight answer: I want to have a char array of 128 bytes in my C structure. I am running this under 64bit Windows. I want to marshal this over to c#, using the following: The C code: ``` typedef struct s_parameterStuct { int count; char name[ 128 ]; } parameterStruct; ``` And the c# code: ``` [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)] public class parameterStuct { public int count; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)] public char[] name; } ``` Since a char is 2 bytes in c#, should the SizeConst be 128 or 256. Both seem to work fine, but I know only one of them is correct.