Hello, Im trying to learn allegro, so I went to 2dnow.zenzer.net and found a 2d engine written in allegro. So I thought, maybe I could learn something from it. So I wrote down all code in dev-c++ but when I try to compile i get thoose errors: [Linker error] undefined reference to `_imp__key' [Linker error] undefined reference to `_imp__key' [Linker error] undefined reference to `_imp__key' [Linker error] undefined reference to `_imp__key' [Linker error] undefined reference to `_imp__key' [Linker error] undefined reference to `_imp__screen' [Linker error] undefined reference to `_imp__font' [Linker error] undefined reference to `_imp__font' [Linker error] undefined reference to `_imp__font' [Linker error] undefined reference to `_imp__font' [Linker error] undefined reference to `_imp__font' ld returned 1 exit status C:\Dev-Cpp\Makefile.win [Build Error] [2d.exe] Error 1 Thoose errors comes with this code:

/*
main.cpp
Very Basic Tile Engine
- a (what a surprise) very basic tile engine written by DeveloperX.
you may use this code freely, provided you give me credit.
http://ccps.rpgdx.net
This code uses Allegro, don't want to use Allegro?
Replace lines with //ALLEGRO after them with your own code.
*/
#include <allegro.h>
#include <stdio.h>
#define WIDTH           640 // screen width in pixels
#define HEIGHT          480 // screen height in pixels
#define STATE_SHUTDOWN  255 // time to end program?
#define TILEWIDTH       32  // width of tiles in pixels
#define TILEHEIGHT      32  // height of tiles in pixels
#define MAPWIDTH        20  // width of map in tiles
#define MAPHEIGHT       15  // height of map in tiles
#define TILECOUNT       3   // number of tiles in tileset
#define DIR_NORTH       0   // movement directions
#define DIR_EAST        1
#define DIR_SOUTH       2
#define DIR_WEST        3
BITMAP* DoubleBuffer; // ALLEGRO
BITMAP* Tiles[TILECOUNT]; // ALLEGRO
BITMAP* Hero[4]; // ALLEGRO
int Map[MAPHEIGHT][MAPWIDTH] =
{
{2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2},
{2,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,2},
{2,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,2},
{2,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,2},
{2,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2},
{2,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,2},
{2,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,2},
{2,1,1,1,1,1,0,0,0,0,0,0,1,0,0,0,0,0,0,2},
{2,0,0,0,0,1,0,0,1,1,1,1,1,0,0,0,0,0,0,2},
{2,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,2},
{2,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,2},
{2,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,2},
{2,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,2},
{2,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,2},         
{2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2}
};
struct NPC // very basic npc, cannot do anything yet.
{
int x, y;
};
NPC HeroNPC; // our little dude

int gamestate = 0;
int HeroFrame = DIR_SOUTH; // direction we are facing
void ShowScreen();
void RenderMap();

void initialize_gameengine()
{
allegro_init(); // ALLEGRO
install_timer(); // ALLEGRO
install_keyboard(); // ALLEGRO
set_color_depth(16); // ALLEGRO
set_gfx_mode(GFX_AUTODETECT_WINDOWED, WIDTH, HEIGHT, 0, 0); // ALLEGRO
DoubleBuffer = create_bitmap(WIDTH, HEIGHT); // ALLEGRO
srand(time(NULL));
text_mode(-1);
//load tiles
for (int index=0; index<TILECOUNT; index++)
{

  char tile_filename[12];
  sprintf(tile_filename, "data\\tile%d.bmp", index);
  Tiles[index] = load_bitmap(tile_filename, NULL);
}
//load hero images north,east,south,west
Hero[DIR_NORTH] = load_bitmap("data\\heronorth.bmp", NULL);
Hero[DIR_SOUTH] = load_bitmap("data\\herosouth.bmp", NULL);
Hero[DIR_EAST]  = load_bitmap("data\\heroeast.bmp", NULL);
Hero[DIR_WEST]  = load_bitmap("data\\herowest.bmp", NULL);
HeroNPC.x = MAPWIDTH/2; // center out little dude
HeroNPC.y = MAPHEIGHT/2; // ..
}

void process_gameengine()
{
RenderMap();
while(gamestate != STATE_SHUTDOWN)
{
  if (key[KEY_ESC])  {gamestate = STATE_SHUTDOWN;} // ALLEGRO
  if (key[KEY_UP])   {HeroFrame = DIR_NORTH;if (HeroNPC.y > 0)         {HeroNPC.y--;}RenderMap();}// ALLEGRO
  if (key[KEY_DOWN]) {HeroFrame = DIR_SOUTH;if (HeroNPC.y < MAPHEIGHT-1) {HeroNPC.y++;}RenderMap();}// ALLEGRO
  if (key[KEY_LEFT]) {HeroFrame = DIR_WEST; if (HeroNPC.x > 0)         {HeroNPC.x--;}RenderMap();}// ALLEGRO
  if (key[KEY_RIGHT]){HeroFrame = DIR_EAST; if (HeroNPC.x <MAPWIDTH-1)   {HeroNPC.x++;}RenderMap();}// ALLEGRO   
  rest(64); // slow game down a bit
}
}

void shutdown_gameengine()
{
int index;
for (index=0; index<3; index++)
  destroy_bitmap(Hero[index]);           // ALLEGRO
for (index=0; index<TILECOUNT; index++)
  destroy_bitmap(Tiles[index]);          // ALLEGRO
destroy_bitmap(DoubleBuffer);           // ALLEGRO
}

void ShowScreen()
{
blit(DoubleBuffer, screen, 0, 0, 0, 0, WIDTH, HEIGHT); // ALLEGRO
}

void RenderMap()
{
int mx,my;
for (my=0; my<MAPHEIGHT; my++)
{
  for (mx=0; mx<MAPWIDTH; mx++)
  {
   int tilenum = Map[my][mx];
   blit(Tiles[tilenum], DoubleBuffer, 0, 0,
   mx * TILEWIDTH, my * TILEHEIGHT, TILEWIDTH, TILEHEIGHT); // ALLEGRO
  }
}
textprintf(DoubleBuffer,font,8,0,makecol(255,255,255),
"Hero Position: X %d Y %d", HeroNPC.x, HeroNPC.y);
  textprintf(DoubleBuffer,font,8,16,makecol(255,255,255), "Hero Dir: %d", HeroFrame);

switch(Map[HeroNPC.y][HeroNPC.x])
{
  case 0: {textout(DoubleBuffer,font,"GRASS",8,32,makecol(255,255,255));}break;
  case 1: {textout(DoubleBuffer,font,"PATH",8,32,makecol(255,255,255));}break; 
  case 2: {textout(DoubleBuffer,font,"WALL",8,32,makecol(255,255,255));}break; 
}
// draw our dude - transparent color is Red(255), Green(0), Blue(255)

draw_sprite(DoubleBuffer,
             Hero[HeroFrame],
             HeroNPC.x * TILEWIDTH,
             HeroNPC.y * TILEHEIGHT);// ALEGRO
ShowScreen();
}


void main (void)
{
initialize_gameengine();
process_gameengine();
shutdown_gameengine();
}
END_OF_MAIN() // ALLEGRO 

Thanks for helping // Jepalano

Seems as if you forgot to link a library.
Check for missing library references in the linker settings.

Okey! I'll try that you rherm23 said, if it wont work I think I try to contact you :)

Thanks for the answers!

// Jepalano