CR_INIT **init_struct to C#

[zamap]

first i try to call cr_init. than cr_file_get_sign_struct
i dont have compilation error. but
cr_file_get_sign_struct function tell to me that i use wrong parametrs description

WHERE is my fault?

using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;


namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
my myclass = new my();
myclass.myfunction();
}

}
public class my
{
const int MASTER_KEY_LEN = 108;
const int ELG_KEY_LEN = 64 + 2;
const int TM_NUMBER_LEN = 8;
const int USER_ID_LEN = 256;
const int COMMENT_LEN = 256; // ???
const int SIGN_LEN = 64; // Pure Signature length, without User ID, its lenght and CRC.
const int HASH_LEN = 32;
const int ERR_NO_SIGN = 11;

struct CR_INIT
{
public IntPtr empty;
}

CR_INIT init_struct = new CR_INIT();
//CR_INIT init_struct = new CR_INIT();

IntPtr ptrparam = IntPtr.Zero;
//int DECL cr_init(int tm_flag, in
// const char *gk, in
// const char *uz, in
// const char *psw, in
// char *tm_number, out
// int *tmn_blen, in,out
// int *init_mode, out
// CR_INIT **init_struct ); out
[DllImport("Bicr_usr.dll")]
static extern int cr_init(
Int32 tm_flag,
string gk,
string uz,
string psw,
out string tm_number,
ref Int32 tmn_blen,
ref Int32 init_mode,
ref IntPtr init_struct);

//int DECL cr_uninit( CR_INIT *init_struct );
[DllImport("Bicr_usr.dll")]
static extern int cr_uninit(
IntPtr init_struct);

//int DECL cr_file_get_sign_struct (
// CR_INIT *init_struct, In
// const char *file_name, In
// int search_from, In
// void *sign, out
// int *sign_blen, In,out
// char *userid, out
// int *userid_blen, In,out
// int *struct_blen); out
//[DllImport("bicr_usr.dll")]
//unsafe public static extern int cr_file_get_sign_struct(ref CR_INIT glob_cr_init, string file_name, int search_from, object sign, int* sign_blen, string userid, int* ulen, int* struct_blen);
[DllImport("Bicr_usr.dll")]
static extern int cr_file_get_sign_struct(
ref CR_INIT init_struct,
[In] string file_name,
[In] Int32 search_from,
[In, Out] ref char[] sign,
[In, Out] ref Int32 sign_blen,
[In, Out] ref char[] userid,
[In, Out] ref Int32 ulen,
[In, Out] ref Int32 struct_blen);

public void myfunction()
{
Int32 init_mode = 0;
Int32 tmn_blen = 0;
int err = 0;
Int32 signblocklen = 0;
string h = "";


err = cr_init(0, null, null, "", out h, ref tmn_blen, ref init_mode, ref ptrparam);


// Marshal.PtrToStructure(ptrparam,init_struct);
init_struct = (CR_INIT)Marshal.PtrToStructure(ptrparam, typeof(CR_INIT));

// int t = Marshal.SizeOf(ptr);
// init_struct = (CR_INIT)Marshal.PtrToStructure(ptr, typeof(CR_INIT));

GetSignatureFromFile("C:\\86410061.xml", ref signblocklen);
}
Int32 _GetSignatureFromFile(ref CR_INIT init_struct, string file, Int32 search_from, ref char[] sign, Int32 maxsignlen, ref Int32 signlen, ref char[] userid, Int32 maxuidlen, ref Int32 uidlen, ref Int32 struct_blen)
{
int slen = maxsignlen;
int ulen = maxuidlen;

int err = cr_file_get_sign_struct(ref init_struct, file, search_from, ref sign, ref slen, ref userid, ref ulen, ref struct_blen);

if (Convert.ToBoolean(err)) return err;
signlen = slen;
uidlen = ulen;
return 0; // OK
}
public Int32 GetSignatureFromFile(string file, ref int signblocklen)
{
// InitializeCryptoLib();

char[] sign = new char[SIGN_LEN + 101];

Int32 signlen = 0;
char[] userid = new char[USER_ID_LEN + 1];

Int32 uidlen = 0;
Int32 struct_blen = 0;
Int32 err = 0;
Int32 search_from = 0;

for (; ; )
{
err = _GetSignatureFromFile(ref init_struct, file, search_from, ref sign, SIGN_LEN + 100, ref signlen, ref userid, USER_ID_LEN, ref uidlen, ref struct_blen);
if (Convert.ToBoolean(err))
{
if (err == ERR_NO_SIGN)
{
err = 0; // Its OK
signblocklen = search_from;
}
break;
}
search_from = search_from + struct_blen;
}
return err;
}

}
}

[rigamonk]

Structs aren't declared "extern" since you're defining the struct inside your class. You also dont need to reference its dll, again because you are defining the struct in your code.
The "extern" keyword means that, in the case of a function, its body is defined OUTSIDE the current class.

Hope this helps