How to marshall byte* from C.dll in C# -

i have 2 functions trying call c# shares similar signatures:

bool read (byte len, byte* databuf) bool write (byte len, byte* databuf) 

from doc: databuf destination of transmitted data

what shall use in c# call?

• byte[]
• mybytearr[0]
• p/invoke assistant suggested system.intptr

don't have hardware test yet, trying many of calls right when have.

thanks.

for read function use:

[out] byte[] buffer 

for write function use:

[in] byte[] buffer 

[in] default , can omitted not hurt explicit.

the functions therefore be:

[dllimport(filename, callingconvention = callingconvention.cdecl)] static extern bool read(byte len, [out] byte[] buffer);  [dllimport(filename, callingconvention = callingconvention.cdecl)] static extern bool write(byte len, [in] byte[] buffer); 

obviously you'll need allocate array before passing unmanaged functions.

because byte blittable marshaller, optimisation, pins array , passes address of pinned object. means no copying performed , parameter passing efficient.