dialog写进dll调用

#ifdef DLG_WINDOW_API
#define  DLG_WINDOW_EXPORT __declspec(dllexport)
#else
#define DLG_WINDOW_EXPORT __declspec(dllimport)
#endif
class DLG_WINDOW_EXPORT CDlg

extern "C" DLG_WINDOW_EXPORT CDlg* getInstance();
extern "C" DLG_WINDOW_EXPORT void destroyInstance(CDlg*);