Question

我一直在尝试在控制台中发送日志以确保播放器已创建，但结果如下：

以下是问题部分的代码：

// Core Libraries and Headers
// - Global includes
#include <SDL.h>
#include <SDL_image.h>
#include <stdio.h>
#include <string>
#include <typeinfo>

// Defines
#define GRAPHICS "../resources/"

struct Player
{
  std::string sprite;
  std::string name;
  int level;
  int size;
  int health;
  int maxhealth;
  int magicpower; // Magic Points
  int damages;
  int armor;
  int magic;
};

struct Enemy
{
  std::string sprite;
  std::string name;
  int level;
  int size;
  int health;
  int maxhealth;
  int magicpower; // Magic Points
  int damages;
  int armor;
  int magic;
};

Player createPlayer(std::string name);
Enemy createEnemy(std::string name, int level);

int damagePlayer(Player target, int damages);
int damageEnemy(Enemy target, int damages);

void close();

systemValues.h：

// Local includes
// - Custom Headers
#include "systemValues.h"

// Screen constants and dimensions. (TODO: MOVE TO A PROPER HEADER FILE.)
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;

// The window that is rendered to
SDL_Window* window = NULL;

// Quit being false means the application is running and did not request to quit
bool quit = false;

// Event handler
SDL_Event e;

// The surface contained by the window
SDL_Surface* screenSurface = NULL;

// Main function
int main(int argc, char* args[])
{

  // Initializing SDL
  if (SDL_Init(SDL_INIT_VIDEO)<0)
  {
    SDL_Log("SDL could not initialize! SDL_Error: %s\n", SDL_GetError());
  }
  else
  {
    // Creating the window
    window = SDL_CreateWindow("SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
    if (window == NULL)
    {
      SDL_Log("The window could not be created! SDL_Error: %s\n", SDL_GetError());
    }
    else
    {

      Player player1 = createPlayer("Avarthar");
      Enemy enemy1 = createEnemy("Blob", 1);

      // Get the window surface
      screenSurface = SDL_GetWindowSurface(window);

      // While the application is running
      while (!quit){
        while (SDL_PollEvent(&e) != 0)
        {
          // User requests quit
          if (e.type == SDL_QUIT)
          {
            quit = true;
          }
          // Checks for a key being pressed down
          else if (e.type == SDL_KEYDOWN)
          {
            switch(e.key.keysym.sym)
            {
              // Checks if the key is F
              case SDLK_f:
                player1.health = damagePlayer(player1, 5);
                SDL_Log("%s has %i hp out of %i", player1.name, player1.health, player1.maxhealth); // TODO - Remove the test line
                break;
              case SDLK_ESCAPE:
                quit = true;
                break;
            }
          }
        }

        // Test if player is created
        if (player1.name == "Avarthar")
        {
          SDL_FillRect(screenSurface, NULL, SDL_MapRGB(screenSurface->format, (player1.health*-1+100*2), player1.health*2, 0));
        }
        else
        {
          SDL_FillRect(screenSurface, NULL, SDL_MapRGB(screenSurface->format, 255, 255, 255));
        }
        // Update the surface
        SDL_UpdateWindowSurface(window);
      }
    }
  }

  close();

  // Return 0 to terminate the program
  return 0;
}

// Creates a player with the given varables 
Player createPlayer(std::string name)
{
  Player player;
  player.sprite = "";
  player.name = name;
  player.level = 1;
  player.size = 32;
  player.health = 100;
  player.maxhealth = 100;
  player.magicpower = 100;
  player.damages = 1;
  player.armor = 0;
  player.magic = 1;

  return player;
}

Enemy createEnemy(std::string name, int level)
{
  Enemy enemy;
  enemy.sprite = "";
  enemy.name = name;
  enemy.level = level;
  enemy.size = 32;
  enemy.health = 100;
  enemy.maxhealth = 100;
  enemy.magicpower = 100; // Magic Points
  enemy.damages = 1;
  enemy.armor = 0;
  enemy.magic = 1;

  return enemy;
}

// Deals damage to the target of type Player
int damagePlayer(Player target, int damages)
{
  target.health -= damages;

  // Checks whether the target is in the health range or not
  if (target.health < 0)
    target.health = 0;
  if (target.health > target.maxhealth)
    target.health = target.maxhealth;

  return target.health;
}

// Deals damage to the target of type Enemy
int damageEnemy(Enemy target, int damages)
{
  target.health -= damages;

  // Checks whether the target is in the health range or not
  if (target.health < 0)
    target.health = 0;
  if (target.health > target.maxhealth)
    target.health = target.maxhealth;

  return target.health;
}

void close()
{
  // Wait 0.1 seconds
  SDL_Delay(100);

  // Clear the window from the memory
  SDL_DestroyWindow(window);

  // Quit the SDL subsystems
  SDL_Quit();
}

main.cpp中：

&player1.name

到目前为止我尝试了什么：

我尝试使用SDL_Log("%s", player1.name);并没有改变任何内容。
我还尝试了?，而是在输出中写了一个player1.health。

根据SDL_Log更改颜色的工作没有任何问题，但是当我尝试在malloc(sizeof(10))中获取并发送名称时，它会发送上面屏幕截图中显示的输出。

Answer 1

SDL_Log无法std::string。使用player1.name.c_str()。这应该已经触发了警告，检查你的编译器标志。 - 昆汀

感谢您的快速回答，也感谢您注意到我的编译器存在的另一个问题^^

SDL_Log输出??“当试图输出一个字符串

1 个答案: