SDL/TTF: TTF_RenderText_Blended_Wrapped返回NULL

Question

这是我呈现文本的方法(file = Csurface.cpp)：

    SDL_Surface * Csurface::onLoadText(const char* text, TTF_Font* font, SDL_Color text_color, int length)
    {
        //OutputDebugString("Csurface.cpp onLoadText called\n");
        try
        {
            SDL_Surface *surf_return = NULL;

            surf_return = TTF_RenderText_Blended_Wrapped(font, text, text_color, length);

            if (surf_return != NULL) {
                return surf_return;
            }
            else {
                throw 30;
            }
        }
        catch (int e)
        {
            OutputDebugString("EXCEPTION \n");
            OutputDebugString(("Csurface.cpp "+std::to_string(e)).c_str());
EDIT: ADDED THIS LINE
        OutputDebugString(TTF_GetError());
            return NULL;
        }
    }

当我试图将循环中的向量中的信息呈现到屏幕上时，该方法在一段时间后开始返回NULL。这似乎是在该方法的随机调用次数之后。只有当我尝试在循环中呈现文本(file =Capp_OnRender.cpp)时，才会发生这种情况：

    BOOST_FOREACH(Incredient & incredient_value, v_incredients)
    {
        if (y > G_SCREEN_HEIGHT / 100 * 95) {
            x_buttons = G_SCREEN_WIDTH / 100 * 40;
            x_text = G_SCREEN_WIDTH / 100 * 41;
            y = G_SCREEN_HEIGHT / 100 * 20;
        }
        std::string text_incredient = i_game_logic.get_text_incredient(incredient_value);
        surf_text_incredient = Csurface::onLoadText(text_incredient.c_str(), font_large, text_color, G_SCREEN_WIDTH / 100 * 30);
        if (surf_list_incredients != NULL) {
            y_text = y + G_SCREEN_HEIGHT / 100 * 1;
            Csurface::OnDraw(surf_list_incredients, surf_button_buy, x_buttons, y);
            Csurface::OnDraw(surf_list_incredients, surf_text_incredient, x_text, y_text);
            y += G_SCREEN_HEIGHT / 100 * 7;
        }
        else {
            throw 30;
        }
    }

要呈现到屏幕上的字符串的文本看起来很好(不是空/空)。表面(surf_return)为空的原因是什么？

异常消息：

Csurface.cpp 30异常在Game.exe中在0x76DCC42D抛出: Microsoft C++异常: int位于内存位置0x0032E950。

Answer 1

我能读到一条Out of memory信息。

您必须在使用surf_text_incredient之后释放它，它应该避免内存泄漏。就像这样：

BOOST_FOREACH(Incredient & incredient_value, v_incredients)
    {
        if (y > G_SCREEN_HEIGHT / 100 * 95) {
            x_buttons = G_SCREEN_WIDTH / 100 * 40;
            x_text = G_SCREEN_WIDTH / 100 * 41;
            y = G_SCREEN_HEIGHT / 100 * 20;
        }
        std::string text_incredient = i_game_logic.get_text_incredient(incredient_value);
        surf_text_incredient = Csurface::onLoadText(text_incredient.c_str(), font_large, text_color, G_SCREEN_WIDTH / 100 * 30);
        if (surf_list_incredients != NULL) {
            y_text = y + G_SCREEN_HEIGHT / 100 * 1;
            Csurface::OnDraw(surf_list_incredients, surf_button_buy, x_buttons, y);
            Csurface::OnDraw(surf_list_incredients, surf_text_incredient, x_text, y_text);
            y += G_SCREEN_HEIGHT / 100 * 7;
        }
        else {
            throw 30;
        }
        SDL_FreeSurface(surf_text_incredient);
    }