Why doesn't the default case run here? - c++

Question

I wrote these following lines of codes:
#include <sdl.h>
#include <iostream>
#include <stdio.h>
#include <string>
bool running = true;
enum KeyPressSurfaces {
KEY_PRESS_SURFACE_DEFAULT,
KEY_PRESS_SURFACE_UP,
KEY_PRESS_SURFACE_DOWN,
KEY_PRESS_SURFACE_LEFT,
KEY_PRESS_SURFACE_RIGHT,
//de deallocate surface
KEY_PRESS_SURFACE_TOTAL
};
int main(int argc, char** argv) {
//standard stuffs
SDL_Init(SDL_INIT_VIDEO);
SDL_Window* window = SDL_CreateWindow("vibin' with smug pika", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 300, 300, 0);
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
SDL_Surface* loadSurface(std::string path);
SDL_Surface* surface = SDL_GetWindowSurface(window);
SDL_Surface* keypress [KEY_PRESS_SURFACE_TOTAL];
//anh hien tai dang duoc load, de BlitSurface len surface
//SDL_BlitSurface(current --> surface)
SDL_Surface* current = NULL;
//set windows icon
SDL_Surface* icon = SDL_LoadBMP("../pikachu/keypress_bmp/icon.bmp");
SDL_SetWindowIcon(window, icon);
SDL_Event event;
//load each image into the keypress array
keypress[KEY_PRESS_SURFACE_DEFAULT] = SDL_LoadBMP("../pikachu/keypress_bmp/default.bmp");
keypress[KEY_PRESS_SURFACE_UP] = SDL_LoadBMP("../pikachu/keypress_bmp/up.bmp");
keypress[KEY_PRESS_SURFACE_DOWN] = SDL_LoadBMP("../pikachu/keypress_bmp/down.bmp");
keypress[KEY_PRESS_SURFACE_LEFT] = SDL_LoadBMP("../pikachu/keypress_bmp/left.bmp");
keypress[KEY_PRESS_SURFACE_RIGHT] = SDL_LoadBMP("../pikachu/keypress_bmp/right.bmp");
while (running) {
while (SDL_PollEvent(&event)){
switch (event.type) {
//user click x
case SDL_QUIT:
running = false;
break;
//where all the user inputs are handled
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
case SDLK_UP:
current = keypress[KEY_PRESS_SURFACE_UP];
break;
case SDLK_DOWN:
current = keypress[KEY_PRESS_SURFACE_DOWN];
break;
case SDLK_LEFT:
current = keypress[KEY_PRESS_SURFACE_LEFT];
break;
case SDLK_RIGHT:
current = keypress[KEY_PRESS_SURFACE_RIGHT];
break;
case SDLK_SPACE:
current = keypress[KEY_PRESS_SURFACE_DEFAULT];
break;
default:
current = keypress[KEY_PRESS_SURFACE_DEFAULT];
}
}
}
SDL_BlitSurface(current, NULL, surface, NULL);
SDL_UpdateWindowSurface(window);
}
//deallocating surfaces
for(int i=0; i<KEY_PRESS_SURFACE_TOTAL; ++i) {
SDL_FreeSurface(keypress[i]);
keypress[i] = NULL;
}
//destroy everythangggg
SDL_DestroyWindow(window);
SDL_DestroyRenderer(renderer);
SDL_Quit();
return 0;
}
However, this bit:
default:
current = keypress[KEY_PRESS_SURFACE_DEFAULT];
does not run at all, no matter where I put it. The program should have shown the default image at the beginning, but there's only black when I compiled. Everything else runs fine and I cannot determine what mistake I make.
I'm using CodeBlock version 20.03 and the latest version of SDL2.

Answer 1

I created a solution for you, and I have some notes to check from your end,
Check if the file path is correct
../pikachu/keypress_bmp/default.bmp.
When you want to trigger the default, you should press another key
e.i Enter, A, B, etc.
I have downloaded an SDL library I am not sure if you are using the
same, but mine is V2.
I have commented on your code, which I didn't use here in the image
path.
here is my code and result:
//#include <sdl.h>
#include <SDL.h>
#include <iostream>
#include <stdio.h>
#include <string>
bool running = true;
enum KeyPressSurfaces {
KEY_PRESS_SURFACE_DEFAULT,
KEY_PRESS_SURFACE_UP,
KEY_PRESS_SURFACE_DOWN,
KEY_PRESS_SURFACE_LEFT,
KEY_PRESS_SURFACE_RIGHT,
//de deallocate surface
KEY_PRESS_SURFACE_TOTAL
};
int main(int argc, char** argv) {
//standard stuffs
SDL_Init(SDL_INIT_VIDEO);
SDL_Window* window = SDL_CreateWindow("vibin' with smug pika", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 300, 300, 0);
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
SDL_Surface* loadSurface(std::string path);
SDL_Surface* surface = SDL_GetWindowSurface(window);
SDL_Surface* keypress[KEY_PRESS_SURFACE_TOTAL];
//anh hien tai dang duoc load, de BlitSurface len surface
//SDL_BlitSurface(current --> surface)
SDL_Surface* current = NULL;
//set windows icon
//SDL_Surface* icon = SDL_LoadBMP("../pikachu/keypress_bmp/icon.bmp");
SDL_Surface* icon = SDL_LoadBMP("C:/Users/Awat/Desktop/bmp/img1.bmp");
SDL_SetWindowIcon(window, icon);
SDL_Event event;
//load each image into the keypress array
/*
keypress[KEY_PRESS_SURFACE_DEFAULT] = SDL_LoadBMP("../pikachu/keypress_bmp/default.bmp");
keypress[KEY_PRESS_SURFACE_UP] = SDL_LoadBMP("../pikachu/keypress_bmp/up.bmp");
keypress[KEY_PRESS_SURFACE_DOWN] = SDL_LoadBMP("../pikachu/keypress_bmp/down.bmp");
keypress[KEY_PRESS_SURFACE_LEFT] = SDL_LoadBMP("../pikachu/keypress_bmp/left.bmp");
keypress[KEY_PRESS_SURFACE_RIGHT] = SDL_LoadBMP("../pikachu/keypress_bmp/right.bmp");
*/
keypress[KEY_PRESS_SURFACE_DEFAULT] = SDL_LoadBMP("C:/Users/Awat/Desktop/bmp/imgD.bmp");
keypress[KEY_PRESS_SURFACE_UP] = SDL_LoadBMP("C:/Users/Awat/Desktop/bmp/img3.bmp");
keypress[KEY_PRESS_SURFACE_DOWN] = SDL_LoadBMP("C:/Users/Awat/Desktop/bmp/img4.bmp");
keypress[KEY_PRESS_SURFACE_LEFT] = SDL_LoadBMP("C:/Users/Awat/Desktop/bmp/img5.bmp");
keypress[KEY_PRESS_SURFACE_RIGHT] = SDL_LoadBMP("C:/Users/Awat/Desktop/bmp/img6.bmp");
while (running) {
while (SDL_PollEvent(&event)) {
switch (event.type) {
//user click x
case SDL_QUIT:
running = false;
break;
//where all the user inputs are handled
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
case SDLK_UP:
current = keypress[KEY_PRESS_SURFACE_UP];
break;
case SDLK_DOWN:
current = keypress[KEY_PRESS_SURFACE_DOWN];
break;
case SDLK_LEFT:
current = keypress[KEY_PRESS_SURFACE_LEFT];
break;
case SDLK_RIGHT:
current = keypress[KEY_PRESS_SURFACE_RIGHT];
break;
case SDLK_SPACE:
current = keypress[KEY_PRESS_SURFACE_DEFAULT];
break;
default:
current = keypress[KEY_PRESS_SURFACE_DEFAULT];
}
}
}
SDL_BlitSurface(current, NULL, surface, NULL);
SDL_UpdateWindowSurface(window);
}
//deallocating surfaces
for (int i = 0; i < KEY_PRESS_SURFACE_TOTAL; ++i) {
SDL_FreeSurface(keypress[i]);
keypress[i] = NULL;
}
//destroy everythangggg
SDL_DestroyWindow(window);
SDL_DestroyRenderer(renderer);
SDL_Quit();
return 0;
}