GCC/SDL2 Hangs Indefinitely and Stops Responding - c

Question

Hi guys Ive been at this issue for a few days now and cant find the answer. After a successful build of SDL2 my projects hang and dont respond. They dont accept input and hang indefinitely unless I close them using the command prompt window. Even the 'X' on the application window doesnt respond. As far as I can tell this issue seems to be related to the window itself as the program can draw to the renderer. Please help.
I am using Windows 7, MinGW32, Eclipse Europa and SDL2
See below for example of the problem....
Internal Builder is used for build
gcc -O0 -g3 -Wall -c -fmessage-length=0 -osrc\CTestProject.o ..\src\CTestProject.c
gcc -oCTestProject.exe src\CTestProject.o -lmingw32 -lSDL2main -lSDL2
Build complete for project CTestProject
Time consumed: 562 ms.
Here is the example program
#include <stdio.h>
#include <stdlib.h>
#include <SDL2/SDL.h>
int main(int argc, char* args[]) {
SDL_Init(SDL_INIT_EVERYTHING);
SDL_Event event;
SDL_Window* sdlWindow = SDL_CreateWindow("test",SDL_WINDOWPOS_CENTERED,SDL_WINDOWPOS_CENTERED,300,300,SDL_WINDOW_OPENGL);
SDL_Renderer* sdlRenderer = SDL_CreateRenderer(sdlWindow, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
while(event.type != SDL_QUIT){
SDL_RenderClear(sdlRenderer);
SDL_SetRenderDrawColor(sdlRenderer, 150, 0, 0, 255);
SDL_RenderPresent(sdlRenderer);
}
SDL_DestroyRenderer(sdlRenderer);
SDL_DestroyWindow(sdlWindow);
SDL_Quit();
return EXIT_SUCCESS;
}

Answer 1

while(event.type != SDL_QUIT)
{
SDL_RenderClear(sdlRenderer);
SDL_SetRenderDrawColor(sdlRenderer, 150, 0, 0, 255);
SDL_RenderPresent(sdlRenderer);
}
You are comparing a variable that doesn't change in your while loop. You need to update it in every iteration of loop using SDL_PollEvent(&event) Something like this:
bool quit = false;
SDL_Event event;
// Loop while user hasn't quit
while ( !quit )
{
// Check all new event to see if a SDL_QUIT event has come in...
while (SDL_PollEvent(&event) )
{
// SDL_QUIT event has come in, quit.
if ( event.type == SDL_QUIT )
{
quit = true;
}
}
SDL_RenderClear(sdlRenderer);
SDL_SetRenderDrawColor(sdlRenderer, 150, 0, 0, 255);
SDL_RenderPresent(sdlRenderer);
}
Also I don't think you need SDL2_main anymore. At least I don't use it in my code.
Nor do you need #include <stdio.h> and #include <stdlib.h> in your specific example.
Tutorials
SDL2 is fairly new, so there aren't that much tutorials around. The only ones I know is TwinklebearDev.But in most cases SDL1.3 and SDL2 are quite similar. So in most cases you can use SDL1.3 code with SDL_Texture, SDL_Renderer and SDL_Window.You can have a look here for more information on porting from 1.3 to 2.0. For SDL1.3 I have used LazyFoo's tutorials.