c - 使用 ttf 库 SDL C 的段错误

Question

我正在尝试使用 C 将文本放在 sdl 的窗口上。我正在关注这个 tutorial.如果我一步一步地进行，在他初始化表面之后:

 SDL_Color color = { 255, 255, 255 };
 SDL_Surface * surface = TTF_RenderText_Solid(font,"Welcome to Programmer's Ranch", color);

我遇到段错误。所以此时我的代码是这样的:

#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_ttf.h>


int main(int argc, char ** argv)
{
    int quit = 0;
    SDL_Event event;

    SDL_Init(SDL_INIT_VIDEO);

    TTF_Init(); //Initialise ttf library

    SDL_Window * window = SDL_CreateWindow("SDL_ttf in SDL2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, 0);
    SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, 0);

    TTF_Font * font = TTF_OpenFont("arial.ttf", 25);//Load text(to put after renderere initialisation!)The first is the path to the TrueType Font (TTF) that it needs to load. The second is the font size (in points, not pixels). In this case we're loading Arial with a size of 25.
    SDL_Color color = { 255, 255, 255 };
    SDL_Surface * surface = TTF_RenderText_Solid(font, "Welcome to Programmer's Ranch", color);

    while (!quit)
    {
        SDL_WaitEvent(&event);

        switch (event.type)
        {
            case SDL_QUIT:
            quit = 1;
            break;
        }
    }

    TTF_CloseFont(font);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    TTF_Quit();
    SDL_Quit();

    return 0;
}

虽然他的整个源代码都可用here ，但无论如何它都不起作用。

Answer 1

很可能 arial.ttf 的路径是错误的。确保包含根项目目录中该文件的完整路径。

您应该做的是每次在 sdl 中启动或加载某些内容时添加异常处理程序/sdl-2 。例如:

#include <stdexcept>

try
{
    TTF_Font * font = TTF_OpenFont("arial.ttf", 25);
    if (font == NULL)
    {
        throw(::std::runtime_error("Font failed to load! ERROR: "));
    }
}
catch (std::runtime_error const& msg)
{
    printf("%s", msg.what());
    if (SDL_GetError() != NULL)
    {
        printf("%s", SDL_GetError());
    }
    if (TTF_GetError() != NULL)
    {
        printf("%s", TTF_GetError());
    }
}