Marshalling a pointer of struct in C++ to an array in C# -

i have following c++ structs:

typedef struct point {     int x;     int y; } point;   typedef struct imtresult {     int    numberofpoints;     point* vect_intima;     point* vect_media;     point* vect_adventitia; } imtresult; 

where numberofpoints length of each pointer of point

and c++ function:

bool setsecondpoint( int x, int y, imtresult* result ); 

how can marshall imtresult struct in c#? tried:

public struct imtresult {     public int numberofpoints;     public intptr vect_intima;     public intptr vect_media;     public intptr vect_adventitia; } 

and tried manage myself 3 vectors using:

[dllimport("mydll.dll", callingconvention = callingconvention.cdecl)] public static extern bool setsecondpoint(int x, int y, [marshalas(unmanagedtype.struct)] ref imtresult result);  public bool dllsetsecondpoint(int x, int y, ref imtresult result) {     bool res = setsecondpoint(x, y, ref result);      int structsize = marshal.sizeof(typeof(point));     point vect = new point();     intptr ptr = result.vect_media;     (int = 0; < result.numberofpoints; i++)     {         point vect = (point) marshal.ptrtostructure(ptr, typeof(point));         ptr = (intptr)((int)ptr + structsize);     }      return res; } 

but vect results in vector x , y equal -1 . tried marshal attribute each of these vectors unsuccessfully. me?

in fact, there no problem @ all. code absolutely correct. thanks!