[英]Why Is SDL_image not working
我是C ++和SDL的新手。 我正在嘗試使用此處的說明添加新的SDL擴展庫: http : //www.lazyfoo.net/SDL_tutorials/lesson03/windows/devcpp/index.php
但是我得到這些錯誤:
3 C:\\ Documents and Settings \\ Edmund \\ My Documents \\ C ++ \\ myprojects \\ SDL \\ SDLevent.cpp SDL / SDL_image.h:無此類文件或目錄。
C:\\ Documents and Settings \\ Edmund \\ My Documents \\ C ++ \\ myprojects \\ SDL \\ SDLevent.cpp在函數SDL_Surface * load_image(std :: string)中:
28 C:\\ Documents and Settings \\ Edmund \\ My Documents \\ C ++ \\ myprojects \\ SDL \\ SDLevent.cpp未聲明“ IMG_Load”(首先使用此功能)
然后是一堆不合格的ID。
這是我的代碼:
#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include <string>
//Screen attributes
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;
//The surfaces
SDL_Surface *image = NULL;
SDL_Surface *screen = NULL;
//The event structure that will be used
SDL_Event event;
SDL_Surface *load_image( std::string filename )
{
//The image that's loaded
SDL_Surface* loadedImage = NULL;
//The optimized image 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 image
optimizedImage = SDL_DisplayFormat( loadedImage );
//Free the old image
SDL_FreeSurface( loadedImage );
}
//Return the optimized image
return optimizedImage;
}
void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination )
{
//Temporary rectangle to hold the offsets
SDL_Rect offset;
//Get the offsets
offset.x = x;
offset.y = y;
//Blit the surface
SDL_BlitSurface( source, NULL, 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;
}
//Set the window caption
SDL_WM_SetCaption( "Event test", NULL );
//If everything initialized fine
return true;
}
bool load_files()
{
//Load the image
image = load_image( "astyle.bmp" );
//If there was an error in loading the image
if( image == NULL )
{
return false;
}
//If everything loaded fine
return true;
}
void clean_up()
{
//Free the image
SDL_FreeSurface( image );
//Quit SDL
SDL_Quit();
}
//Initialize
if( init() == false )
{
return 1;
}
//Load the files
if( load_files() == false )
{
return 1;
}
//Apply the surface to the screen
apply_surface( 0, 0, image, screen );
//Update the screen
if( SDL_Flip( screen ) == -1 )
{
return 1;
}
//While the user hasn't quit
while( quit == false )
{
//While there's an event 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 the surface and quit SDL
clean_up();
return 0;
}
它與教程中的內容幾乎相同,因此代碼不會出現問題。 我已按照Lazy foo上的說明進行操作,我已將所有文件放在正確的位置並鏈接到它們,所以我不知道我在做什么錯。
您的編譯器找不到SDL/SDL_image.h
標頭,這將導致所有這些“未聲明的”錯誤。
也許您跳過了鏈接說明中的步驟2 。
您確定完全具有SDL_Image函數嗎? 您正在使用什么IDE? 如果其Visual Studio確保您已鏈接以下內容:
還要確保您已從http://www.libsdl.org/projects/SDL_image/下載了最新的SDL_Image文件。
另一個可能的問題是您沒有將SDL_Image DLL文件放置在正確的位置。
你應該使用
#include "SDL.h"
#include "SDL_image.h"
並確保已將sdl include文件夾放在include目錄中
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.