Question

#include<SDL2/SDL.h>
#include<stdio.h>
#include<stdbool.h>

bool init(char *title, int width, int height);
void close();

SDL_Window *window = NULL;
SDL_Surface *screen = NULL;

bool init(char *title, int width, int height){

    bool success = true;

// SDL_Init 0 on success and returns negative on failure
   if( SDL_Init(SDL_INIT_EVERYTHING) != 0 ){
       SDL_Log("Couldn't initialize SDL: %s",SDL_GetError());
       success = false;
   }

// creating Window and Surface
  window = SDL_CreateWindow(title, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, SDL_WINDOW_SHOWN );


// SDL_CreateWindow returns window on creation and NULL on failure
    if ( !window ){
        SDL_Log("Couldn't create window: %s",SDL_GetError());
        success = false;
    } else {
        // get window surface
        screen = SDL_GetWindowSurface( window );
        if ( screen == NULL ){
            SDL_Log("Couldn't get window surface: %s",SDL_GetError());
            success = false;
        }
    }
    return success;
}

void close(){
    // deallocate surface
    SDL_FreeSurface( screen );
    // destroy window
    SDL_DestroyWindow( window );
    // SDL_Quit();
    SDL_Quit();
}

int main(){
    bool running  = true;
    SDL_Event event;
    if( init("My Window", 800, 600) ){
       printf("Congrats\n");
    } else {
        printf("Sorry :(\n");
    }

   while( running ) {
      //  start = SDL_GetTicks();
        while ( SDL_PollEvent( &event ) ){
            switch( event.type ){
                case SDL_QUIT:
                    running = false;
                    break;
            }
        SDL_UpdateWindowSurface( window );
        }
    }

    close();
}

我尝试创建一个单独的函数来初始化SDL Window，然后尝试将曲面附加到它，但它给了Segmentation fault (core dumped)。有时它也会给出错误Info: invalid window。

如果我不创建单独的函数并仅在main函数中运行此代码，它就可以工作！

Answer 1

您忘记实现一个关键功能，即：

SDL_BlitSurface（SDL_Surface *，const SDL_Rect *，SDL_Surface *，SDL_Rect *）;

此功能可以使表面变白并将数据（图形信息）加载到SDL_Surface Structure中。

如果您想了解有关此功能的更多详细信息，可以查看链接。

链接：https://wiki.libsdl.org/SDL_BlitSurface

创建窗口时SDL错误？

1 个答案: