printf not doing anything in C++ and SDL

[faillord adam]

I'm trying to make a simple Space Invaders game, but when I try to print instructions to the player, nothing happens.

Here's my code:

#ifdef __cplusplus
#include <cstdlib>
#else
#include <stdlib.h>
#endif
#ifdef __APPLE__
#include <SDL/SDL.h>
#else
#include <SDL/SDL.h>
#endif
#include <iostream>

int main ( int argc, char** argv )
{
// initialize SDL video
if ( SDL_Init( SDL_INIT_VIDEO ) < 0 )
{
printf( "Unable to init SDL: %s\n", SDL_GetError() );
return 1;
}

// make sure SDL cleans up before exit
atexit(SDL_Quit);

// create a new window
SDL_Surface* screen = SDL_SetVideoMode(640, 480, 16,
SDL_HWSURFACE|SDL_DOUBLEBUF);
if ( !screen )
{
printf("Unable to set 640x480 video: %s\n", SDL_GetError());
return 1;
}

// program main loop
bool done = false;
while (!done)
{
// message processing loop
SDL_Event event;
while (SDL_PollEvent(&event))
{
// check for messages
switch (event.type)
{
// exit if the window is closed
case SDL_QUIT:
done = true;
break;

// check for keypresses
case SDL_KEYDOWN:
{
// exit if ESCAPE is pressed
if (event.key.keysym.sym == SDLK_ESCAPE)
done = true;
break;
}

{
printf("Press ESC to exit/nUse the left and right keys to move/nCLick to fire/n");
}
} // end switch
} // end of message processing

// DRAWING STARTS HERE

// clear screen
SDL_FillRect(screen, 0, SDL_MapRGB(screen->format, 0, 0, 0));

// DRAWING ENDS HERE

// finally, update the screen :)
SDL_Flip(screen);
} // end main loop

// all is well ;)
printf("Thank you for playing Space Invaders\n");
return 0;
}


What's wrong?

[Arndt]

I'm trying to make a simple Space Invaders game, but when I try to print instructions to the player, nothing happens.

Here's my code:

#ifdef __cplusplus
#include <cstdlib>
#else
#include <stdlib.h>
#endif
#ifdef __APPLE__
#include <SDL/SDL.h>
#else
#include <SDL/SDL.h>
#endif
#include <iostream>

int main ( int argc, char** argv )
{
// initialize SDL video
if ( SDL_Init( SDL_INIT_VIDEO ) < 0 )
{
printf( "Unable to init SDL: %s\n", SDL_GetError() );
return 1;
}

// make sure SDL cleans up before exit
atexit(SDL_Quit);

// create a new window
SDL_Surface* screen = SDL_SetVideoMode(640, 480, 16,
SDL_HWSURFACE|SDL_DOUBLEBUF);
if ( !screen )
{
printf("Unable to set 640x480 video: %s\n", SDL_GetError());
return 1;
}

// program main loop
bool done = false;
while (!done)
{
// message processing loop
SDL_Event event;
while (SDL_PollEvent(&event))
{
// check for messages
switch (event.type)
{
// exit if the window is closed
case SDL_QUIT:
done = true;
break;

// check for keypresses
case SDL_KEYDOWN:
{
// exit if ESCAPE is pressed
if (event.key.keysym.sym == SDLK_ESCAPE)
done = true;
break;
}

{
printf("Press ESC to exit/nUse the left and right keys to move/nCLick to fire/n");
}
} // end switch
} // end of message processing

// DRAWING STARTS HERE

// clear screen
SDL_FillRect(screen, 0, SDL_MapRGB(screen->format, 0, 0, 0));

// DRAWING ENDS HERE

// finally, update the screen :)
SDL_Flip(screen);
} // end main loop

// all is well ;)
printf("Thank you for playing Space Invaders\n");
return 0;
}


What's wrong?

Is the printf in question actually reached?

[gusnan]

How are you starting your program? If you are starting it from your desktop by double-clicking the programs icon, you won't see the output of your printf's. On the other hand, if you are starting it from a terminal, or from an IDE, the output should be visible.

(If all worked fine, at least the "Thank you for playing Space Invaders\n" message should be shown.)