掌機 - Miyoo A30 - C/C++ - SDL v2.0 - Keyboard Event

main.c

#include <stdio.h>
#include <stdlib.h>
#include <SDL.h>
#include <SDL2_gfxPrimitives.h>
  
int main(int argc, char **argv)
{
    const int w = 320;
    const int h = 240;
    const int bpp = 16;
    char buf[255] = {0};
    SDL_Window *window = NULL;
    SDL_Renderer *renderer = NULL;
 
    SDL_Init(SDL_INIT_VIDEO);
    window = SDL_CreateWindow("main", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, w, h, SDL_WINDOW_SHOWN);
    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
 
    SDL_RenderClear(renderer);
    SDL_RenderPresent(renderer);
 
    SDL_Event event;
    while (1) {
        if (SDL_PollEvent(&event)) {
            if (event.type == SDL_KEYDOWN) {
                sprintf(buf, "key: 0x%x", event.key.keysym.sym);
                SDL_RenderClear(renderer);
                stringRGBA(renderer, 100, 100, buf, 0xff, 0xff, 0xff, 0xff);
                SDL_RenderPresent(renderer);
 
                if (event.key.keysym.sym == SDLK_a) {
                    break;
                }
            }
        }
        SDL_Delay(15);
    }
 
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}

編譯、執行

$ /opt/a30/bin/arm-linux-gcc \
    -I/opt/a30/arm-a30-linux-gnueabihf/sysroot/usr/include/SDL2 \
    -lSDL2 -lSDL2_gfx -lSDL2_image -lSDL2_ttf -lSDL2_mixer \
    -lGLESv2 main.c -o main

/mnt/SDCARD# export LD_LIBRARY_PATH=.:/config/lib:/customer/lib:/usr/miyoo/lib
/mnt/SDCARD# ./main