这是我第一次使用SDL2库。当我按下W和S（处理第一个玩家位置）时，按住它们，然后我按下键盘，没有任何反应。好奇的是，当我拿着W和S按钮时，其他按钮工作得很好。
当我以相反的方式（按住向上和向下按钮......）时，会发生同样的事情。
标题文件：
/**
* Header file for theGame.
*
*/
#include <SDL2/SDL_ttf.h>
// macro definitions
#define HEIGHT 540
#define WIDTH 960
#define SPEED 300
#define MAXBULLETS 1000
#define BULLETSPEED 700
// structs definitions
typedef struct{
bool up, down, left, right, up2, down2, left2, right2;
bool p1Shooting, p2Shooting;
} Action;
typedef struct{
int x;
int y;
bool walking, shooting, alive, facingLeft;
int currentSprite;
int hp;
SDL_Texture *sheetTexture;
} Man;
typedef struct{
int x, y;
bool display; // is it on the screen
bool goingRight;
} Bullet;
typedef struct{
Man *p_p1;
Man *p_p2;
Bullet *bullets;
Action *action;
SDL_Texture *bulletTexture;
int frames;
} gameState;
/**
* Function detects keyboard actions.
*/
void eventsDetection(SDL_Event *event, Action *action, bool *running);
//other stuff
void renderStuff(SDL_Renderer *renderer, gameState game);
void logicStuff(gameState game);
int isInWindow(int x, int y);
void drawText(SDL_Renderer *renderer, char *text, int x, int y);
有问题的功能：
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_timer.h>
#include <SDL2/SDL_ttf.h>
#include "theGame.h"
void eventsDetection(SDL_Event *event, Action *p_action, bool *running)
{
switch(event->type)
{
case SDL_QUIT:
*running = false;
break;
case SDL_KEYDOWN:
switch (event->key.keysym.scancode)
{
case SDL_SCANCODE_W:
p_action->up = true;
break;
case SDL_SCANCODE_S:
p_action->down = true;
break;
case SDL_SCANCODE_D:
p_action->right = true;
break;
case SDL_SCANCODE_A:
p_action->left = true;
break;
case SDL_SCANCODE_SPACE:
p_action->p1Shooting = true;
break;
}
break;
case SDL_KEYUP:
switch (event->key.keysym.scancode)
{
case SDL_SCANCODE_W:
p_action->up = false;
break;
case SDL_SCANCODE_S:
p_action->down = false;
break;
case SDL_SCANCODE_D:
p_action->right = false;
break;
case SDL_SCANCODE_A:
p_action->left = false;
break;
case SDL_SCANCODE_SPACE:
p_action->p1Shooting = false;
break;
}
break;
}
switch(event->type)
{
case SDL_QUIT:
*running = false;
break;
case SDL_KEYDOWN:
switch (event->key.keysym.scancode)
{
case SDL_SCANCODE_UP:
p_action->up2 = true;
break;
case SDL_SCANCODE_DOWN:
p_action->down2 = true;
break;
case SDL_SCANCODE_RIGHT:
p_action->right2 = true;
break;
case SDL_SCANCODE_LEFT:
p_action->left2 = true;
break;
case SDL_SCANCODE_P:
p_action->p2Shooting = true;
break;
}
break;
case SDL_KEYUP:
switch (event->key.keysym.scancode)
{
case SDL_SCANCODE_UP:
p_action->up2 = false;
break;
case SDL_SCANCODE_DOWN:
p_action->down2 = false;
break;
case SDL_SCANCODE_RIGHT:
p_action->right2 = false;
break;
case SDL_SCANCODE_LEFT:
p_action->left2 = false;
break;
case SDL_SCANCODE_P:
p_action->p2Shooting = false;
break;
}
break;
}
/*printf("----------------------\nACTIONS\n"
"1p: %d up, %d down, %d left, %d right\n"
"2p: %d up, %d down, %d left, %d right\n",
p_action->up,p_action->down,p_action->left,p_action->right,
p_action->up2,p_action->down2,p_action->left2,p_action->right2
);*/
}
最后是主要的重要部分：
// Animation loop
while(running)
{
// events processing
while(SDL_PollEvent(&event))
{
eventsDetection(&event, p_action, &running);
}
// logic stuff
logicStuff(game);
// rendering
renderStuff(renderer, game);
// Show what was drawn
SDL_RenderPresent(renderer);
game.frames = game.frames + 1;
} // end of animation loop
非常感谢您的帮助。