[英]In C, how can I get the appropriate memory alignment for my platform?
[英]How can I perfectly manage my memory of my C project?
我正在研究 SDL Tetris 的一个对象。 当我运行我的代码时,它首先运行良好。 但它会在几分钟后自动停止显示我的文字。 我猜内存管理肯定有问题,我通过任务管理器证明我是对的。
我查看了我的源代码,但没有发现任何问题。 (至少我没有找到它)我删除的每个堆对象都被释放并且纹理被破坏。 那么,可能是什么问题?
这是我的源代码:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include <stdbool.h>
#define SDL_MAIN_HANDLED
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>
SDL_Window * window;
SDL_Renderer * renderer;
SDL_Surface * text;
TTF_Font* font;
bool running = true;
#define ScreenWidth 60
#define ScreenHeight 30
#define CharWidth 14
#define CharHeight 24
char screen[ScreenHeight][ScreenWidth + 1];
SDL_Color color = {192, 192, 192};
SDL_Rect rect;
int score = 0;
char shapes[7][17];
typedef struct Block {
int type;
char shape[17];
int x, y;
int width, height;
} Block;
Block * newBlock(int type) {
Block * block = malloc(sizeof(Block));
return block;
}
void CheckEvents() {
SDL_Event event;
while (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT) {
running = false;
} else if (event.type == SDL_KEYDOWN) {
switch (event.key.keysym.sym) {
case SDLK_w:
;
break;
case SDLK_a:
;
break;
case SDLK_d:
;
break;
case SDLK_s:
;
break;
case SDLK_SPACE:
;
break;
default:
break;
}
}
}
free(&event);
}
void UpdateBoard() {
for (int i = 0; i < ScreenHeight; ++i) {
for (int j = 0; j < ScreenWidth; ++j) {
screen[i][j] = ' ';
}
}
for (int i = 0; i != 20; ++i) {
screen[i + 2][1] = '#';
screen[i + 2][1 + 10 + 1] = '#';
}
for (int i = 0; i != 10 + 2; ++i) {
screen[22][i + 1] = '#';
}
sprintf(&(screen[0][1]), "Score: %d", score);
for (int i = 0; i != ScreenHeight; i++) {
for (int j = 0; j != ScreenWidth; j++) {
if (screen[i][j] == '\0') {
screen[i][j] = ' ';
}
}
}
}
void UpdateScreen() {
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
for (int i = 0; i < ScreenHeight; ++i) {
text = TTF_RenderText_Solid(font, screen[i], color);
SDL_Texture * texture;
texture = SDL_CreateTextureFromSurface(renderer, text);
rect.x = 0;
rect.y = i * CharHeight;
rect.w = strlen(screen[i]) * CharWidth;
rect.h = CharHeight;
SDL_RenderCopy(renderer, texture, NULL, &rect);
free(texture);
SDL_DestroyTexture(texture);
}
SDL_RenderPresent(renderer);
}
void Init() {
SDL_Init(SDL_INIT_EVERYTHING);
TTF_Init();
window = SDL_CreateWindow("Tetris", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
ScreenWidth * CharWidth, ScreenHeight * CharHeight, 0);
renderer = SDL_CreateRenderer(window, -1, 0);
font = TTF_OpenFont("s8514oem.fon", 0);
sprintf(shapes[0], "OOOO............");
sprintf(shapes[1], "OO...OO.........");
sprintf(shapes[2], ".OO.OO..........");
sprintf(shapes[3], "O...OOO.........");
sprintf(shapes[4], "..O.OOO.........");
sprintf(shapes[5], "OO..OO..........");
sprintf(shapes[6], "OOO..O..........");
}
int main(int argc, char ** argv) {
Init();
while (running) {
CheckEvents();
UpdateBoard();
UpdateScreen();
SDL_Delay(1000/16);
}
TTF_Quit();
SDL_Quit();
return 0;
}
我的制作文件:
tetris:
gcc -std=c99 -Wall -Isrc/include -Lsrc/lib -o Tetris main.c -lSDL2main -lSDL2 -lSDL2_ttf
几件事:
不要尝试free()
堆栈分配的变量,例如event
:
//free(&event);
在用来自TTF_RenderText_Solid()
的新指针值替换其指针值之前,需要使用SDL_FreeSurface()
释放text
:
if(text) { SDL_FreeSurface(text); } text = TTF_RenderText_Solid(font, screen[i], color);
不要在SDL_CreateTextureFromSurface()
返回的纹理上使用free()
) ,只使用SDL_DestroyTexture()
:
texture = SDL_CreateTextureFromSurface(renderer, text); ... //free(texture); SDL_DestroyTexture(texture);
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