c++ sqlite3_prepare_v2 is not working

this is my first post so excuse me if I forget to add some information, or my english mistakes.

I m working in c++ with code:block(13.12) making a DLL of sqlite3 functions and using MinGW toolchain. (windows 7)

I was using sqlite3_exec function but i want to change to sqlite3_prepare_v2, sqlite_bind.., sqlite3_step, etc because I think it will be easy to get back the return params. However, after calling that new function from another program written also in c++, it crash giving me this error:

  Nombre del evento de problema:  APPCRASH
  Nombre de la aplicación:    SQL_try.exe
  Versión de la aplicación:   0.0.0.0
  Marca de tiempo de la aplicación:   5594a5af
  Nombre del módulo con errores:  sqlite3.dll
  Versión del módulo con errores: 3.8.10.2
  Marca de tiempo del módulo con errores: 555cd28a
  Código de excepción:    c0000005
  Desplazamiento de excepción:    0001ee21
  Versión del sistema operativo:  6.1.7601.2.1.0.768.3
  Id. de configuración regional:  3082
  Información adicional 1:    0a9e
  Información adicional 2:    0a9e372d3b4ad19135b953a78882e789`
  Información adicional 3:    0a9e
  Información adicional 4:    0a9e372d3b4ad19135b953a78882e789

I can not easily depurated it because I m not use to code:block and also I m calling the function from a DLL.

This is the function I m using, that i get it from this other post:[Proper use of callback function of sqlite3 in C++

string DLL_EXPORT readFromDB(sqlite3* db, int id)
{   string result;
    sqlite3_stmt *stmt;
     const char *sql="SELECT name FROM datos WHERE id = ?";
    int rc = sqlite3_prepare_v2(db, sql,-1 , &stmt, NULL);
    if (rc != SQLITE_OK)
        return string(sqlite3_errmsg(db));

    rc = sqlite3_bind_int(stmt, 1, id);    // Using parameters ("?") is not
    if (rc != SQLITE_OK) {                 // really necessary, but recommended
        string errmsg(sqlite3_errmsg(db)); // (especially for strings) to avoid
        sqlite3_finalize(stmt);            // formatting problems and SQL
        return errmsg;                      // injection attacks.
    }

    rc = sqlite3_step(stmt);
    if (rc != SQLITE_ROW && rc != SQLITE_DONE) {
        string errmsg(sqlite3_errmsg(db));
        sqlite3_finalize(stmt);
        return errmsg;
    }
    if (rc == SQLITE_DONE) {
        sqlite3_finalize(stmt);
        return string("customer not found");
    }

    result= string((char *)sqlite3_column_text(stmt, 0))+ " ";
   // *result=*result + string((char*)sqlite3_column_text(stmt, 1)) +" ";
    //*result=*result + string((char*)sqlite3_column_int(stmt, 2));

    sqlite3_finalize(stmt);
   return result;
}

I m calling the DLL function with:

mifunc5=(Myfunc5)GetProcAddress(  histDLL,"readFromDB");
   aString=(mifunc5)(db,1);

An I don't think that the problem is that the db is not loaded, beacuse the other functions works and i tryed to comment all except the sqlite3_prepare_v2 and sqlite3_finalize funtions, neither works.

Thank you very much for your attention. :)