程序运行退出没有错误

问题描述

我正在编写关于SDL的LazyFoo SDL教程的第7个教程 []。我已确保标头和库文件位于SDL文件夹中的正确位置。我还用我的exe包含了项目文件夹中的所有dll。我试着评论我的所有返回语句，看看其中一个条件是否被绊倒返回。一切看起来都很好，但我不能让窗户保持打开状态，并在其上显示带有文字的背景。我正在使用代码块作为我的IDE。





/ *此源代码版权归Lazy Foo'Productions所有（2004-2013）

，未经书面许可，不得重新分发。* /

I am working through the 7th tutorial on LazyFoo's SDL tutorials on SDL http://lazyfoo.net/SDL_tutorials/index.php[^]. I have made sure that the header and library files are in the proper location in my SDL folder. I also have include all the dll's in the project folder with my exe. I tried commenting out all my return statements to see if one of the conditions was being tripped to return. everything looks fine but I cannot get the window to stay open and display the background with text on it. I am using codeblocks as my IDE.


/*This source code copyrighted by Lazy Foo' Productions (2004-2013)
and may not be redistributed without written permission.*/

//The headers
#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "SDL/SDL_ttf.h"
#include <string>

//Screen attributes
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;

//The surfaces
SDL_Surface *background = NULL;
SDL_Surface *message = NULL;
SDL_Surface *screen = NULL;

//The event structure
SDL_Event event;

//The font that's going to be used
TTF_Font *font = NULL;

//The color of the font
SDL_Color textColor = { 255, 255, 255 };

SDL_Surface *load_image( std::string filename )
{
    //The image that's loaded
    SDL_Surface* loadedImage = NULL;

    //The optimized surface that will be used
    SDL_Surface* optimizedImage = NULL;

    //Load the image
    loadedImage = IMG_Load( filename.c_str() );

    //If the image loaded
    if( loadedImage != NULL )
    {
        //Create an optimized surface
        optimizedImage = SDL_DisplayFormat( loadedImage );

        //Free the old surface
        SDL_FreeSurface( loadedImage );

        //If the surface was optimized
        if( optimizedImage != NULL )
        {
            //Color key surface
            SDL_SetColorKey( optimizedImage, SDL_SRCCOLORKEY, SDL_MapRGB( optimizedImage->format, 0, 0xFF, 0xFF ) );
        }
    }

    //Return the optimized surface
    return optimizedImage;
}

void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination, SDL_Rect* clip = NULL )
{
    //Holds offsets
    SDL_Rect offset;

    //Get offsets
    offset.x = x;
    offset.y = y;

    //Blit
    SDL_BlitSurface( source, clip, destination, &offset );
}

bool init()
{
    //Initialize all SDL subsystems
    if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )
    {
        return false;
    }

    //Set up the screen
    screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );

    //If there was an error in setting up the screen
    if( screen == NULL )
    {
        return false;
    }

    //Initialize SDL_ttf
    if( TTF_Init() == -1 )
    {
        return false;
    }

    //Set the window caption
    SDL_WM_SetCaption( "TTF Test", NULL );

    //If everything initialized fine
    return true;
}

bool load_files()
{
    //Load the background image
    background = load_image( "background.png" );

    //Open the font
    font = TTF_OpenFont( "lazy.ttf", 28 );

    //If there was a problem in loading the background
    if( background == NULL )
    {
        return false;
    }

    //If there was an error in loading the font
    if( font == NULL )
    {
        return false;
    }

    //If everything loaded fine
    return true;
}

void clean_up()
{
    //Free the surfaces
    SDL_FreeSurface( background );
    SDL_FreeSurface( message );

    //Close the font that was used
    TTF_CloseFont( font );

    //Quit SDL_ttf
    TTF_Quit();

    //Quit SDL
    SDL_Quit();
}

int main( int argc, char* args[] )
{
    //Quit flag
    bool quit = false;

    //Initialize
    if( init() == false )
    {
        return 1;
    }

    //Load the files
    if( load_files() == false )
    {
        return 1;
    }

    //Render the text
    message = TTF_RenderText_Solid( font, "The quick brown fox jumps over the lazy dog", textColor );

    //If there was an error in rendering the text
    if( message == NULL )
    {
        return 1;
    }

    //Apply the images to the screen
    apply_surface( 0, 0, background, screen );
    apply_surface( 0, 150, message, screen );

    //Update the screen
    if( SDL_Flip( screen ) == -1 )
    {
        return 1;
    }

    //While the user hasn't quit
    while( quit == false )
    {
        //While there's events to handle
        while( SDL_PollEvent( &event ) )
        {
            //If the user has Xed out the window
            if( event.type == SDL_QUIT )
            {
                //Quit the program
                quit = true;
            }
        }
    }

    //Free surfaces and font then quit SDL_ttf and SDL
    clean_up();

    return 0;
}

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