Why the game window closes after specific time? - c++

Question

Why the window that created by SDL Game Library are automatically closed after specific time.
I know the reason is SDL_Delay() function, but if not used that function, the game will appear runtime error.
How can I create a window that continuously work without appear in specific period time ?
My code(Simplest code):
SDL_Window *window;
SDL_Renderer *render;
int main(int argc, char* args[]){
if(SDL_Init(SDL_INIT_EVERYTHING) >= 0){
window = SDL_CreateWindow("Simple game", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
if(window != 0){
render = SDL_CreateRenderer(window, -1, 0);
}
}else{
return 1;
}
SDL_SetRenderDrawColor(render, 0, 0, 0, 255);
SDL_RenderClear(render);
SDL_RenderPresent(render);
SDL_Delay(3000);
SDL_Quit();
return 0
}

Answer 1

You need to loop forever and call SDL update screen functions. Read LazyFoo tutorials found here: http://lazyfoo.net/SDL_tutorials
Or here a short code to get you started:
#include <iostream>
#include "SDL/SDL.h" // basic SDL
#include <string>
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BBP = 32; // bits per-pixel
SDL_Surface* screen = NULL; // display screen
SDL_Event event; // grab events
using namespace std;
bool init() {
// initialize SDL
if(SDL_Init( SDL_INIT_EVERYTHING ) == -1)
return false;
//the screen image
screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT,
SCREEN_BBP, SDL_SWSURFACE );
if(!screen) {
cout << "error creating screen" << endl;
return false;
}
//Set the window caption
SDL_WM_SetCaption("Event Test", NULL );
return true;
}
int main(int argc, char* argv[])
{
try
{
// make sure the program waits for a quit
bool quit = false;
cout << "Starting SDL..." << endl;
// Start SDL
if(!init()) {
cout << "initialize error" << endl;
return false;
}
// main loop
while( quit == false )
{
if (SDL_PollEvent(&event))
{
// The x button click
if(event.type == SDL_QUIT)
{
//quit the program
quit = true;
}
}
// Fill the screen white
SDL_FillRect( screen, &screen->clip_rect, SDL_MapRGB(
screen->format, 0xFF, 0xFF, 0xFF ) );
//Update screen
if(SDL_Flip(screen) == -1)
return -1;
}
}
catch (exception& e)
{
cerr << "exception caught: " << e.what() << endl;
return -1;
}
return 0;
}