CLion不显示C ++ SDL2的输出

时间:2018-02-17 20:00:52

标签: c++ stdout sdl-2 clion

我正在使用Windows上的SDL2在CLion中开展一个小项目。

当我在CLion中编译并运行(Shift + F10)我的程序时,它不会显示任何控制台输出。但是,当我使用调试器(Shift + F9)运行它时,它确实显示控制台输出..

我不知道造成这种情况的原因。

为了确保我的项目或CLion没有破坏某些内容,我已将源代码复制到新项目并使用相同的CMakeList.txt文件进行设置,但仍然没有工作

我的CMakeList.txt

CMakeList.txt

cmake_minimum_required(VERSION 3.6)
project(SDL_Project)

set(CMAKE_CXX_STANDARD 14)

# FindSDL2.cmake
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

find_package(SDL2 REQUIRED)
find_package(SDL2_image REQUIRED)
#find_package(SDL2_ttf REQUIRED)

include_directories(${SDL2_INCLUDE_DIR})
include_directories(${SDL2_IMAGE_INCLUDE_DIR})
#include_directories(${SDL2_TTF_INCLUDE_DIR})

add_executable(SDL_Project src/main.cpp src/Game.cpp src/Game.h)
set_target_properties(SDL_Project PROPERTIES WIN32_EXECUTABLE FALSE)

target_link_libraries(SDL_Project ${SDL2_LIBRARY})
target_link_libraries(SDL_Project ${SDL2_IMAGE_LIBRARIES})
#target_link_libraries(SDL_Project ${SDL2_TTF_LIBRARIES})

我也尝试编译以下代码(没有SDL2,但使用相同的CMakeList.txt):

#include <iostream>

int main(int argv, char* args[]) {
    std::cout << "Hello World!" << std::endl;
    return 0;
}

这有同样的问题;没有控制台输出。

find_package中没有include_directoriestarget_link_librariesCMakeList.txt的情况下编译上述代码会显示控制台输出!所以它与SDL2有关,我认为......?

有谁知道造成这种情况的原因,以及如何解决?

虽然我认为问题出在CMakeList.txt,但这是剩下的代码:

main.cpp

#include <SDL.h>
#include <iostream>

#include "Game.h"

int main(int argv, char* args[]) {

    const int FPS = 60;
    const uint32_t frameDelay = 1000 / FPS;

    const WindowSettings settings = {SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 1280, 720};
    Game game;

    Uint32 frameStart;
    Uint32 frameTime;

    game.init("Game", settings);

    while (game.isRunning()) {
        frameStart = SDL_GetTicks();

        game.handleEvents();
        game.tick();
        game.render();

        frameTime = SDL_GetTicks() - frameStart;

        std::cout << "Frame time: " << frameTime << " / " << frameDelay << std::endl;
        if (frameTime < frameDelay) {
            std::cout << "Frame delay: " << (frameDelay - frameTime) << std::endl;
            SDL_Delay(frameDelay - frameTime);
        }
    }

    game.cleanup();

    return 0;
}

Game.h

#ifndef SDL_PROJECT_GAME_H
#define SDL_PROJECT_GAME_H

#include <SDL.h>

struct WindowSettings {
    int x;
    int y;
    int width;
    int height;
};

class Game {
private:
    bool running;
    SDL_Window* window;
    SDL_Renderer* renderer;

public:
    Game();
    ~Game();

    void init(const char* title, const WindowSettings &settings);
    void tick();
    void render();
    void cleanup();
    void handleEvents();

    bool isRunning() { return running; }
};


#endif //SDL_PROJECT_GAME_H

Game.cpp

#include <iostream>
#include "Game.h"

Game::Game():
        running(false),
        window(nullptr),
        renderer(nullptr) {
}

Game::~Game() = default;

void Game::init(const char *title, const WindowSettings &settings) {
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        std::cout << "SDL initialization failed: " << SDL_GetError() << std::endl;
        return;
    };

    window = SDL_CreateWindow(title, settings.x, settings.y, settings.width, settings.height, SDL_WINDOW_SHOWN);
    if (window == nullptr) {
        std::cout << "Unable to create window: " << SDL_GetError() << std::endl;
        return;
    }

    renderer = SDL_CreateRenderer(window, -1 , 0);
    if (renderer == nullptr) {
        std::cout << "Unable to create renderer: " << SDL_GetError() << std::endl;
        return;
    }

    running = true;
}

void Game::tick() {

}

void Game::render() {
    SDL_RenderClear(renderer);
    SDL_RenderPresent(renderer);
}

void Game::cleanup() {
    if (renderer) {
        SDL_DestroyRenderer(renderer);
    }
    if (window) {
        SDL_DestroyWindow(window);
    }

    SDL_Quit();
    std::cout << "Game clean exit" << std::endl;
}

void Game::handleEvents() {
    SDL_Event event;
    while (SDL_PollEvent(&event)) {
        if (event.type == SDL_QUIT) {
            running = false;
        }
    }
}

2 个答案:

答案 0 :(得分:1)

我能想到1个问题。你确定你的运行配置是正确的CLION吗?调试版本可能正在运行与您想象的不同的可执行文件。 CLION在幕后做了很多事情。单击运行箭头下拉列表,查看编辑配置或其他相应内容。

答案 1 :(得分:0)

好吧,我想通了......

显然,compiling on Windows redirects stdout and stderr to null(?)。我无法找到/删除影响它的编译器标志,但是,SDL provides SDL_Log,实际上输出到控制台(并且可能是stdout?)。

由于我无论如何都在使用SDL2,我不妨使用记录器。它支持printf风格的格式化,这是一个很好的奖励。如果我想重定向日志消息,它允许我设置自定义日志记录功能。