如何处理 SDL 中的输入?

我的 SDL 程序无法正常工作。当我按下 Up 时，它应该会改变图像。但是，只有当我单击窗口中的x时，它才会更改图像

#include "SDL.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
int main(int argc, char* argv[])
{
enum KeyPressSurfaces {
KEY_PRESS_SURFACE_DEFAULT,
KEY_PRESS_SURFACE_UP,
KEY_PRESS_SURFACE_LEFT,
KEY_PRESS_SURFACE_RIGHT,
KEY_PRESS_SURFACE_DOWN,
KEY_PRESS_SURFACE_TOTAL
};
SDL_Init(SDL_INIT_VIDEO);
SDL_Event e;
SDL_Window* window = SDL_CreateWindow("antena1", // window's title
10, 25, // coordinates on the screen, in pixels, of the window's upper left corner
640, 420, // window's length and height in pixels
SDL_WINDOW_OPENGL);
SDL_Surface* key_press_surface[KEY_PRESS_SURFACE_TOTAL];
SDL_Surface* gImage = NULL;
SDL_Surface* gScreenSurface = NULL;
bool quit = false;
key_press_surface[KEY_PRESS_SURFACE_UP] = SDL_LoadBMP("hello_world.bmp");
gScreenSurface = SDL_GetWindowSurface(window);
gImage = SDL_LoadBMP("nick.bmp");
if (gImage == NULL) {
printf("Erro", SDL_GetError);
}
SDL_BlitSurface(gImage, NULL, gScreenSurface, NULL);
SDL_UpdateWindowSurface(window);
gScreenSurface = SDL_GetWindowSurface(window);
while (!quit) {
while (SDL_PollEvent(&e) == 0) {
if (e.type == SDL_QUIT) {
quit = true;
//SDL_DestroyWindow(window);#
}
else if (e.type == SDL_KEYDOWN) {
switch (e.key.keysym.sym) {
case SDLK_LEFT:
gImage = key_press_surface[KEY_PRESS_SURFACE_UP];
break;
default:
gScreenSurface = NULL;
break;
}
}
}
};
SDL_BlitSurface(gImage, NULL, gScreenSurface, NULL);
SDL_UpdateWindowSurface(window);
SDL_Delay(30000);
return 0;
}