How to parse char * buffer from C to C# via dll.

The C function:

extern "C" int  DLLIMPORT ReadDataSP(char *buffer, unsigned int nbChar);

The C# function

[DllImport ("SerialPort")]
public static extern int ReadDataSP( [In, Out] byte[] buffer, int nbChar);

And the usage:

 
byte[] incomingData = new byte[1024];
SerialPortBridge.ReadDataSP(incomingData,dataLength);

string s = System.Text.Encoding.UTF8.GetString(incomingData);

Debug.Log(s);