我正在使用名爲Chipmunk的物理庫來製作我正在寫的遊戲。庫調用中的分段錯誤
在我的initialize
函數中,初始化全局變量cpSpace space
。然後在更新中我打電話cpSpaceStep(space, timestep)
。這個功能的原型是void cpSpaceStep(cpSpace *space, cpFloat dt);
。我在這個函數調用中遇到了段錯誤。我在下面的代碼中標記了這兩個函數調用。
完整的代碼如下:
#include "../include/SDL/SDL_image.h"
#include "../include/SDL/SDL.h"
#include "../include/Player.h"
#include "../include/Timer.h"
#include "../include/Block.h"
#include "../include/ImageLoader.h"
#include "../include/chipmunk/chipmunk.h"
#include <string>
//Screen attributes
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;
//The frame rate
const int FRAMES_PER_SECOND = 60;
SDL_Event event;
SDL_Surface *screen = NULL;
SDL_Surface *player_img = NULL, *block_img = NULL;
Player *player;
Timer fps;
cpSpace *space;
bool quit = false;
void initialize();
void update();
int main(int argc, char* argv[])
{
initialize();
update();
return 1;
}
void initialize()
{
//Initialize all SDL subsystems
if(SDL_Init(SDL_INIT_EVERYTHING) == -1)
{
}
//Set up the screen
screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE);
//If there was an error in setting up the screen
if(screen == NULL)
{
}
//Set the window caption
SDL_WM_SetCaption("Move the Dot", NULL);
cpVect gravity = cpv(0, 100);
//******************cpSpacenew()*****************
//This is where space is init'ed
space = cpSpaceNew();
//***********************************************
}
void update()
{
//While the user hasn't quit
while(quit == false)
{
//Start the frame timer
fps.start();
while(SDL_PollEvent(&event))
{
//Handle events for the dot
player->handle_input(&event);
//If the user has Xed out the window
if(event.type == SDL_QUIT)
{
//Quit the program
quit = true;
}
}
player->update();
cpFloat timeStep = 1.0/FRAMES_PER_SECOND;
//************************Segfault**********************************************
cpSpaceStep(space, timeStep);
//******************************************************************************
//Cap the frame rate
if(fps.get_ticks() < 1000/FRAMES_PER_SECOND)
{
SDL_Delay((1000/FRAMES_PER_SECOND) - fps.get_ticks());
}
}
}
如果需要,我可以發佈gdb輸出。 – 2012-03-06 05:15:13
該解決方案應該從'gdb'輸出中顯而易見。 – 2012-03-06 05:18:02
'cpSpaceNew()'返回什麼?一個指針或引用? – 2012-03-06 05:19:22