SDL2 分段错误

我正在尝试制作一个程序来根据键盘输入移动框，但目前它只设置为在屏幕上呈现一个绿色矩形。但是，程序似乎初始化了窗口，然后在终止之前只返回"分段错误(核心转储)"。我根本没有收到编译器错误，而且相当多的代码与我在网上找到的教程相匹配。如果它有所作为，我将使用 GCC 在 Ubuntu 上运行 Code：：Blocks。

main基本上按顺序调用称为init、drawRect和close(均如下所示)的函数，根据成功或失败打印语句。

编辑：将其缩小到close，如下所示。特别是，它SDL_FreeSurface和SDL_Quit给我带来问题。我还清理了有关指针处理的近距离(和程序的其他部分)，并制作了一个新的 pastebin 文件。

关闭：

void close()
{
// Deallocate gScreenSurface
SDL_FreeSurface(gScreenSurface);
gScreenSurface=NULL;
// Destroy renderer
SDL_DestroyRenderer(gRenderer);
gRenderer=NULL;
// Destroy gWindow
SDL_DestroyWindow(gWindow);
gWindow=NULL;
SDL_Quit();
}

以下是新的完整源代码，包括指针初始化、包含和伪代码：

/* === Includes === */
#include <cstdlib>
#include <stdio.h>
#include "SDL2/SDL.h"
using namespace std;
/* === Constants === */
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
/* === Enums === */
/*enum Keys {KEY_DEFAULT,
KEY_UP,
KEY_DOWN,
KEY_LEFT,
KEY_RIGHT,
KEY_TOTAL};*/
/* === Prototypes === */
bool init();
bool drawRect(SDL_Renderer* pRenderer, SDL_Rect* pRect, int pX, int pY, int pW, int pH, int pR, int pG, int pB, int pA);
void close();
/* === Pointer Initialization === */
SDL_Window* gWindow = NULL;
SDL_Surface* gScreenSurface = NULL;
SDL_Renderer* gRenderer = NULL;
SDL_Rect* gRect = NULL;
/**==================================================
Box Mover
This was intended to be a learning activity to
teach myself how to use SDL, in particular basic
"block" graphics and keyboard inputs.
Unfortunately, I can't figure out why it's always
returning seg fault. I think it's outside of main,
but I can't be sure.
==================================================**/
int main()
{
if(!init())
printf("Failed to initialize!n");
else
{
if(!drawRect(gRenderer, gRect, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, 255, 0, 255))
printf("Failed to draw rectangle!n");
else
{
/*SDL_BlitSurface( gImage, NULL, gScreenSurface, NULL);
SDL_UpdateWindowSurface(gWindow);
SDL_Delay(2000);*/
printf("Success in main!n"); // Placeholder until I figure out why I'm getting a seg fault, then I can fix the contents.
}
}
close();
return 0;
}
/*=========================
Init
Initializes SDL
Returns true for success, false for failure
Prints error on failure
=========================*/
bool init()
{
//Initialization flag
bool success = true;
if( SDL_Init( SDL_INIT_VIDEO ) < 0 )
{
printf( "SDL could not initialize! SDL_Error: %sn", SDL_GetError() );
success = false;
}
else
{
gWindow = SDL_CreateWindow( "Box Mover", 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, 0 );
if( gWindow == NULL )
{
printf( "Window could not be created! SDL_Error: %sn", SDL_GetError() );
success = false;
}
else
{
gScreenSurface = SDL_GetWindowSurface( gWindow );
}
}
return success;
}
/*=========================
Draw Rectangle
Draws a rectangle of specified color and location
TO DO:
Check to see if renderer needs to be deallocated here.
Inputs:
>> pRenderer:     SDL_Renderer pointer which can be thought of as a drawing tool
>> pRect:         SDL_Rect pointer which holds location and size data
>> pX, pY:        X-Y location of the upper left corner of the rectangle
>> pR, pG, pB:    Color values (technically Uint8, 0-255)
>> pA:            Alpha (transparency) value of the rectangle (also technically Uint8)
=========================*/
bool drawRect(SDL_Renderer* pRenderer, SDL_Rect* pRect, int x, int y, int w, int h, int r, int g, int b, int a)
{
bool success = true;
pRenderer=SDL_CreateRenderer(gWindow, -1, SDL_RENDERER_SOFTWARE);
if(pRenderer==NULL)
{
printf("Renderer could not be created! SDL Error: %sn", SDL_GetError());
success=false;
}
else
{
pRect = new SDL_Rect;
if(pRect == NULL)
{
printf("Could not create rectangle! SDL Error: %sn", SDL_GetError());
success=false;
}
else
{
pRect->x = x;
pRect->y = y;
pRect->w = w;
pRect->h = h;
SDL_SetRenderDrawColor(pRenderer, r, g, b, a);
if(SDL_RenderDrawRect(pRenderer, pRect) < 0)
{
printf("Rectangle could not be rendered! SDL Error: %sn", SDL_GetError());
success=false;
}
}
}
return success;
}
/*=========================
Close
Closes the SDL systems cleanly, deallocating memory.
Found the seg fault! It's this fucker!
In particular, SDL_FreeSurface and SDL_Quit
=========================*/
void close()
{
// Deallocate gScreenSurface
SDL_FreeSurface(gScreenSurface);
gScreenSurface=NULL;
printf("Surface closed. Working on renderer...n");
// Destroy renderer
SDL_DestroyRenderer(gRenderer);
gRenderer=NULL;
printf("Renderer closed. Working on window...n");
// Destroy gWindow
SDL_DestroyWindow(gWindow);
gWindow=NULL;
printf("Window closed. Working on SDL...n");
SDL_Quit();
printf("SDL closed.n");
}