Problems with SDL (LNK1561)

[Luis Pais]

Hi everyone!

I've been reading SDLtutorials.com and now I'm learning the "Per pixel Collision" tutorial but whenever I try to Build my programs it comes out with a LNK5161 error..
Here is the code:

game.h

#ifndef GAME_H
#define GAME_H
#include "SDL.h"

class game
{
public:
    game();
    ~game();

    void onexecute();

    void onthink();
    void onupdate();
    void onrender();

private:
    int screenwidth;
    int screenheight;
    int screenbbp;
    Uint32 screenflags;

    bool done;

    double thistime;
    double lasttime;
    double deltatime;

    SDL_Surface* screen;
    SDL_Event event;
};

#endif

Game.cpp

#include "Games.h"

game::game()
{
    screenwidth=800;
    screenheight=600;
    screenbbp=32;
    screenflags=SDL_HWSURFACE | SDL_DOUBLEBUF;

    thistime=0.0;
    lasttime=0.0;
    deltatime=0.0;

    done=false;

    SDL_Init(SDL_INIT_EVERYTHING);
    SDL_WM_SetCaption("SDL Per Pizel Collision", NULL);
    SDL_ShowCursor(0);

    screen=SDL_SetVideoMode(screenwidth, screenheight, screenbbp, screenflags);

}
game::~game()
{
    SDL_Quit();
}

void game::onexecute()
{
    while(!done)
    {
        onthink();
        onupdate();
        onrender();
    }
}

void game::onthink()
{
    while(SDL_PollEvent(&event))
    {
        if(event.type==SDL_QUIT)
            done=true;

        if(event.type==SDL_KEYDOWN)
            if(event.key.keysym.sym==SDLK_ESCAPE)
                done=true;
    }
}

void game::onrender()
{
    SDL_FillRect(screen, NULL, 0);

        SDL_Flip(screen);
}

int main(int argc, char* args[])
{
    game game;
    game.onexecute();

    return 0;
}

Log

1>------ Build started: Project: re-write SDL pre pixel collision, Configuration: Debug Win32 ------
1>  game.cpp
1>LINK : fatal error LNK1561: entry point must be defined
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Any ideas?

Thanks for reading!

[Neo1]

SDL requires you to use argc and argv as the arguments to main, since you're using "args" instead it probably chokes on that. Replace your main with this:

int main(int argc, char *argv[])

[Luis Pais]

Nop, same error after replace...

I'm gonna give up on SDL and move to java..

Thanks for the help!

[sfryett]

A couple of things:

#include "Games.h"

Should that be game.h?

void game::onexecute()
{
    while(!done)
    {
        onthink();
        onupdate();
        onrender();
    }
}

The onupdate() method has a declaration but no implementation.

Otherwise compiles & runs fine (Xubuntu 12.04 / Codeblocks 10.05); have you set the compiler / linker options? Have you run other SDL programs okay?

Before we start, I'd like to say that this is an advanced SDL tutorial. You should have experience with creating SDL applications and some basic knowledge of getting a program with it's libraries up and running.

Cheers,
Stu