SFML community forums

Help => General => Topic started by: ravenheart on October 05, 2008, 11:41:45 am

Title: i didnt want to post it ^^
Post by: ravenheart on October 05, 2008, 11:41:45 am

Code: [Select]

class Missile
{
public :

    static bool Init(const std::string& ImageFile)
    {
        return Image.LoadFromFile(ImageFile);
    }

    Missile()
    {
        Sprite.SetImage(Image); // every sprite uses the same unique image
    }

private :

    static sf::Image Image; // shared by every instance

    sf::Sprite Sprite; // one per instance
};

 i want this to be in seperate files, but

Code: [Select]


#include "sfml-graphic.hpp"
class Missile
{
public :

    static bool Init(const std::string& ImageFile);
    Missile();

private :
    static sf::Image Image; // shared by every instance
    sf::Sprite Sprite; // one per instance
};

in .h and

Code: [Select]



#includes

static bool Missile::Init(...)
{
return Image.LoadFromFile(...)
}

Missile::Missile()
    {
        Sprite.SetImage(Image); // every sprite uses the same unique image
    }
doesnt work

i already asked in a c++ forum but i dont get a answer

edit : code::blocks says :
C:\Programme\CodeBlocks\MEINS\Object\object.cpp|16|error: cannot declare member function `static bool object::Init(const std::string&)' to have static linkage|
||=== Build finished: 1 errors, 0 warnings ===|

Title: i didnt want to post it ^^
Post by: InconnuConnu on October 05, 2008, 11:50:39 am

You don't need the static keyword in the function definition inside the cpp file.

Title: i didnt want to post it ^^
Post by: ravenheart on October 05, 2008, 11:53:08 am

then i get:
||Info: resolving vtable for sf::Spriteby linking to __imp___ZTVN2sf6SpriteE |
||warning: auto-importing has been activated without --enable-auto-import specified on the command line.|
This should work unless it involves constant data structures referencing symbols from auto-imported DLLs.obj\Debug\object.o||In function `_ZN6object4InitERKSs':|
C:\Programme\CodeBlocks\MEINS\Object\object.cpp|16|undefined reference to `object::Image'|
obj\Debug\object.o||In function `_ZN6objectC2Ev':|
C:\Programme\CodeBlocks\MEINS\Object\object.cpp|21|undefined reference to `object::Image'|
obj\Debug\object.o||In function `_ZN6objectC1Ev':|
C:\Programme\CodeBlocks\MEINS\Object\object.cpp|21|undefined reference to `object::Image'|
||=== Build finished: 3 errors, 1 warnings ===|

edit: replace Missile with object

Title: i didnt want to post it ^^
Post by: Avency on October 05, 2008, 12:23:08 pm

This should work:

Missile.h

Code: [Select]

#include <SFML/Graphics.hpp>

class Missile
{
public :

    Missile();

    static bool Init(const std::string& ImageFile);

private :

    static sf::Image Image; // shared by every instance

    sf::Sprite Sprite; // one per instance
};

Missile.cpp

Code: [Select]

sf::Image Missile::Image;

Missile::Missile()
{
Sprite.SetImage(Image); // every sprite uses the same unique image
}

bool Missile::Init(const std::string& ImageFile)
{
return Image.LoadFromFile(ImageFile);
}


Maybe you should read a book about C++.