Question

我正在学习法语教程，以学习C编程，现在我正在面对制作计时器的练习，该计时器每100毫秒更新一次。由于本教程适用于SDL，并且我正在使用SDL2，因此我将其与Internet上的一些知识相结合。如果这里有人有时间并且了解一些SDL2 / SDL_TTF，您可以尝试解决此问题吗？函数nulos（）是一种找到初始化的方法。要恢复，我的两个问题是：窗口在大约2秒后关闭，并且我无法单击关闭选项，第二个是我的文本不显示。

祝你有美好的一天！

int compteur()
{
    SDL_Window      *pWindow = NULL;
    SDL_Renderer    *pRenderer = NULL;
    SDL_Texture     *pTexture = NULL;
    SDL_Surface     *pSurface = NULL;
    SDL_Surface     *pTexte = NULL;
    SDL_Event       event;
    TTF_Font        *pFont = NULL;
    SDL_Color       black = {0, 0, 0};
    SDL_Color       white = {255, 255, 255};
    SDL_Rect        position = {200, 200, 0, 0};

    int             bPlay = 1;
    int             tempsActuel = 0;
    int             tempsPrecedent = 0;
    int             compteur = 0;
    char            temps[20];
    temps[0] = '\0';

    if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) != 0)
    {
        fprintf(stderr, "Erreur SDL_Init : %s ", SDL_GetError());
        exit(EXIT_FAILURE);
    }

    TTF_Init();

    pWindow = SDL_CreateWindow("COMPTEUR.C", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, WIDTH, HEIGHT, SDL_WINDOW_SHOWN);
    pRenderer = SDL_CreateRenderer(pWindow, -1, SDL_RENDERER_ACCELERATED);
    pSurface = SDL_GetWindowSurface(pWindow);
    if(nulos(pWindow, pRenderer, pSurface) != 0)
        exit(EXIT_FAILURE);

    pFont = TTF_OpenFont("images/Gabriola.ttf", 40);
    if(pFont == NULL)
    {
        fprintf(stderr, "Error TTF_OpenFont : %s ", TTF_GetError());
        exit(EXIT_FAILURE);
    }

    TTF_SetFontStyle(pFont, TTF_STYLE_ITALIC | TTF_STYLE_UNDERLINE);

    tempsActuel = SDL_GetTicks();
    sprintf(temps, "Temps : %d", compteur);
    pTexte = TTF_RenderText_Shaded(pFont, temps, black, white);

    while(bPlay != 0)
    {
        SDL_WaitEvent(&event);
        switch(event.type)
        {
            case SDL_QUIT:
                bPlay = 0;
                break;
        }

        SDL_FillRect(pSurface, NULL, SDL_MapRGB(pSurface->format, black.r, black.g, black.b));
        SDL_RenderClear(pRenderer);

        tempsActuel = SDL_GetTicks();
        if(tempsActuel - tempsPrecedent >= 100)
        {
            compteur += 100;
            sprintf(temps, "Temps : %d", compteur);
            pTexte = TTF_RenderText_Shaded(pFont, temps, black, white);
            tempsPrecedent = tempsActuel;
        }

        SDL_BlitSurface(pTexte, NULL, pSurface, &position);
        SDL_FreeSurface(pTexte);
        pTexture = SDL_CreateTextureFromSurface(pRenderer, pSurface);
        SDL_RenderCopy(pRenderer, pTexture, NULL, NULL);
        SDL_RenderClear(pRenderer);
    }

    SDL_DestroyRenderer(pRenderer);
    SDL_FreeSurface(pSurface);
    SDL_DestroyRenderer(pRenderer);
    SDL_DestroyWindow(pWindow);
    TTF_Quit();
    SDL_Quit();
    return EXIT_SUCCESS;
}

int nulos(SDL_Window *w, SDL_Renderer *r, SDL_Surface *s)
{
    if(w == NULL)
    {
        fprintf(stderr, "Erreur SDL_CreateWindow : %s ", SDL_GetError());
        return -1;
    }
    else if(r == NULL)
    {
        fprintf(stderr, "Erreur SDL_CreateRenderer : %s ", SDL_GetError());
        return -1;
    }
    else if(s == NULL)
    {
        fprintf(stderr, "Erreur SDL_GetWindowSurface : %s ", SDL_GetError());
        return -1;
    }
    return 0;
}

Answer 1

好的，我已经解决了第一个问题，那只是一个粗心的错误。应该是：

SDL_RenderPresent(pRenderer);

代替

SDL_RenderClear(pRenderer);

但是窗口仍然会自行关闭...

Answer 2

好吧，我做到了！对于任何想知道的人，这里都是“好的”编程。我将SDL_PollEvent并将pTexte移到其他地方：

#include "main.h"

int compteur()
{
    SDL_Window      *pWindow = NULL;
    SDL_Renderer    *pRenderer = NULL;
    SDL_Texture     *pTexture = NULL;
    SDL_Surface     *pSurface = NULL;
    SDL_Surface     *pTexte = NULL;
    SDL_Event       event;
    TTF_Font        *pFont = NULL;
    SDL_Color       black = {0, 0, 0};
    SDL_Color       white = {255, 255, 255};
    SDL_Rect        position;
    SDL_bool        bQuit = SDL_FALSE;

    int             tempsActuel = 0;
    int             tempsPrecedent = 0;
    int             compteur = 0;
    char            temps[20];
    temps[0] = '\0';

    if(SDL_Init(SDL_INIT_VIDEO) != 0)
    {
        fprintf(stderr, "Erreur SDL_Init : %s ", SDL_GetError());
        exit(EXIT_FAILURE);
    }

    TTF_Init();

    pWindow = SDL_CreateWindow("COMPTEUR.C", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, WIDTH, HEIGHT, SDL_WINDOW_SHOWN);
    pRenderer = SDL_CreateRenderer(pWindow, -1, SDL_RENDERER_ACCELERATED);
    SDL_RenderClear(pRenderer);
    pSurface = SDL_GetWindowSurface(pWindow);

    if(pWindow == NULL || pRenderer == NULL || pSurface == NULL)
    {
        fprintf(stderr, "Erreur : %s ", SDL_GetError());
        exit(EXIT_FAILURE);
    }

    pFont = TTF_OpenFont("images/Gabriola.ttf", 40); 
    if(pFont == NULL)
    {
        fprintf(stderr, "Error TTF_OpenFont : %s ", TTF_GetError());
        exit(EXIT_FAILURE);
    }

    TTF_SetFontStyle(pFont, TTF_STYLE_ITALIC | TTF_STYLE_UNDERLINE);

    tempsActuel = SDL_GetTicks();
    sprintf(temps, "Temps : %d", compteur);
    pTexte = TTF_RenderText_Shaded(pFont, temps, black, white);
    if(pTexte == NULL)
    {
        fprintf(stderr, "Error TTF_RenderText_Shaded : %s ", TTF_GetError());
        exit(EXIT_FAILURE);
    }

    while(!bQuit) //SDL_FALSE == 0
    {
        while(SDL_PollEvent(&event))
        {
            switch(event.type)
            {
                case SDL_QUIT:
                    bQuit = SDL_TRUE;
                    break; 
            }
        }
        tempsActuel = SDL_GetTicks();
        if(tempsActuel - tempsPrecedent >= 100)
        {
            compteur += 100;
            sprintf(temps, "Temps : %d", compteur);
            tempsPrecedent = tempsActuel;
        }

        position.x = 180;
        position.y = 210;

        pTexte = TTF_RenderText_Shaded(pFont, temps, white, black);
        SDL_FillRect(pSurface, NULL, SDL_MapRGB(pSurface->format, black.r, black.g, black.b));      
        SDL_BlitSurface(pTexte, NULL, pSurface, &position);
        SDL_FreeSurface(pTexte);

        pTexture = SDL_CreateTextureFromSurface(pRenderer, pSurface);
        if(pTexture == NULL)
        {
            fprintf(stderr, "Error SDL_CreateTextureFromSurface : %s ", SDL_GetError());
            exit(EXIT_FAILURE);
        }

        SDL_RenderCopy(pRenderer, pTexture, NULL, NULL);
        SDL_RenderPresent(pRenderer);
    }

    SDL_Delay(20);
    SDL_FreeSurface(pSurface);
    if(pTexture != NULL)
        SDL_DestroyTexture(pTexture);
    if(pRenderer != NULL)
        SDL_DestroyRenderer(pRenderer);
    if(pWindow != NULL)
        SDL_DestroyWindow(pWindow);
    TTF_Quit();
    SDL_Quit();
    return EXIT_SUCCESS;
}

开关（event.type）不起作用＆计时器不显示

2 个答案: