fread с непонятной ошибкой

    FILE *t = fopen("squares.db","r");                            
    if (!t) {
        char log[1024];
        sprintf(log, "Error opening squares.db", argv[1]);
        SetReady(log);      
        return 1;
    }
    town_square *town=NULL;                                    
    vector<TOWN_SQUARE> squares;                           
    while (fread(town,sizeof(town_square),1,t)==1) {
        squares.push_back(*town);                               
    }
    fclose(t);

typedef struct point_town
{
    float x, y;
    point_town(float _x = 0.0f, float _y = 0.0f) { x = _x, y = _y; }
    bool operator == (const point_town& p){return (this->x == p.x && this->y == p.y);}
    bool operator != (const point_town& p){return !((*this) == p);}
} POINT_TOWN;
 
typedef struct town_square
{
    point_town min,max;
    char file_name[32];
    town_square(point_town _min, point_town _max, char _file_name[32]) { min.x=_min.x; min.y=_min.y; max.x=_max.x; max.y=_max.y; 
      memset(_file_name,0,sizeof(file_name)*sizeof(file_name[0]));
}
} TOWN_SQUARE;

    town_square town=town_square((0.0f,0.0f),(0.0f,0.0f),"");     
    vector<TOWN_SQUARE> squares;                                  
    while (fread(&town,sizeof(town_square),1,t)==1) {
        squares.push_back(town);                           
    }
    fclose(t);

FILE *t = fopen("squares.db","r");

int main()
{
    FILE *t = fopen("squares.db", "rb");                            
    
    town_square town = town_square((0.0f, 0.0f),(0.0f, 0.0f),"");                                    
    vector<TOWN_SQUARE> squares;                           
    while (!feof(t))
    {
        fread(&town.min.x, sizeof(float), 1, t);
        fread(&town.min.y, sizeof(float), 1, t);
        fread(&town.max.x, sizeof(float), 1, t);
        fread(&town.max.y, sizeof(float), 1, t);
        fread(&town.file_name, sizeof(char), 32, t);
        squares.push_back(town);
    }                               
    
    fclose(t);

typedef struct town_square
{
    point_town min; 
    point_town max;
    char file_name[32];
    
    town_square(point_town _min, point_town _max, char _file_name[32]) 
    { 
        min.x = _min.x; min.y = _min.y; max.x = _max.x; max.y = _max.y; 
        strcpy(file_name, _file_name);
    }

 town_square town(point_town(0.0f, 0.0f), point_town(0.0f, 0.0f), "");

 while (true)
    {
        fread(&town.min.x, sizeof(float), 1, t);
        fread(&town.min.y, sizeof(float), 1, t);
        fread(&town.max.x, sizeof(float), 1, t);
        fread(&town.max.y, sizeof(float), 1, t);
        fread(&town.file_name, sizeof(char), 32, t);
        if (feof(t)) break;
        squares.push_back(town);
   }

town_square town(point_town(), point_town(), "");