如何在DLL中使用类? [英] How to use a class in DLL?
问题描述
我可以把一个类放在DLL中吗?
我写的类是这样:
Can I put a class inside a DLL? The class i wrote is this:
class SDLConsole
{
public:
SDLConsole();
~SDLConsole(){};
void getInfo(int,int);
void initConsole(char*, char*, SDL_Surface*, int, int, int);
void sendMsg(char*,int, SDL_Surface*);
void cls(SDL_Surface*);
private:
TTF_Font *font;
SDL_Surface *consoleImg;
int width, pos, height, line, size, ctLine;
SDL_Surface* render(char*,int);
};
我知道如何加载DLL并使用DLL中的函数,类里面的DLL?非常感谢。
I know how to load a DLL and use the function inside a DLL, but how can I put a class inside a DLL? Thank you very much.
推荐答案
如果使用运行时动态链接(使用LoadLibrary加载dll)直接,你需要为你的类声明一个接口,并创建一个返回这个类的实例的函数,如下所示:
If you use run time dynamic linking (uses LoadLibrary to load the dll) you cannot access the class directly, you need to declare a interface for your class and create a function that returns a instance of this class, like this:
class ISDLConsole
{
public:
virtual void getInfo(int,int) = 0;
virtual void initConsole(char*, char*, SDL_Surface*, int, int, int) = 0;
virtual void sendMsg(char*,int, SDL_Surface*) = 0;
virtual void cls(SDL_Surface*) = 0;
};
class SDLConsole: public ISDLConsole
{
//rest of the code
};
__declspec(dllexport) ISDLConsole *Create()
{
return new SDLConsole();
}
否则,如果你在加载时链接dll,只需使用提供的信息作者:icecrime: http://msdn.microsoft.com/en-us/library/a90k134d.aspx
Otherwise, if you link the dll during load time, just use the information provided by icecrime: http://msdn.microsoft.com/en-us/library/a90k134d.aspx
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