delphi - C#: How to access an unmanaged, 2-Dbinary array nested in a struct? -

problem: i'm trying access binary records created in borland delphi , stored in sql server database (as blob).

q: heck syntax accessing two-d array in c#????

here's example:

 const   max_bowlers = 8;   gmax_frames = 40;   ...
  
type
  
tframe = record     balls       : array[1..3] of shortint;  // pins standing: balls 1, 2 , 3     pins        : array[1..3] of shortint;      currentball : byte;     score       : integer; // current score (-1= undefined)     attributes  : tframeattributes;     ...
  
tframes = array[1..max_bowlers, 0..gmax_frames] of tframe;
  
tgamerec = record     side       : byte;     bowlers    : tbowlers;     frames     : tframes;     ... 

soooooooo....

i've got valid "gamerec" on c#-land.

i want access gamerec.frames[ibowler, iframe].

q: how define c# type "tframes = array[1..max_bowlers, 0..gmax_frames] of tframe;" can it?

thank in advance .. psm

i found solution:

1. treat 2-d array own struct, containing array.

2. the contained array 1d, consisting of cols * rows elements

3. provide c# "indexed property" external clients can access elements though in 2-d array (which, in terms of memory layout, are!)

     // c# definition delphi 2-d array     [structlayout(layoutkind.sequential, pack = 4)]     public unsafe struct tframes     {         [marshalas(unmanagedtype.byvalarray, sizeconst=(max_bowlers)*(gmax_frames+1))]         private tframe[] row;         public tframe this[int ibowler, int iframe]         {                         {                 int ioffset = (ibowler * (gmax_frames+1)) + iframe;                 return row[ioffset];             }         }     }

    // c# client example     public static string convertsplittostring(tgamerec currentgame, int ibowler)     {         stringbuilder sb = new stringbuilder();         tframes frames = currentgame.frames;         (int iframe = 0; iframe < 10; iframe++)         {             if (frames[ibowler, iframe].fsplit != 0)                 sb.append('.');             else                  sb.append(' ');         }         return sb.tostring ();     }