#ifdef KEYDLL3_EXPORTS //判断是否定义了KEYDLL3_EXPORTS
//是,则定义宏KEYDLL3_API 为__declspec(dllexport)
#define KEYDLL3_API __declspec(dllexport)
#else
//否,则定义宏KEYDLL3_API 为__declspec(dllimport)
#define KEYDLL3_API __declspec(dllimport)
#endif__declspec(dllexport),__declspec(dllimport)是声明为导出还是导入函数。用于dll中。
//是,则定义宏KEYDLL3_API 为__declspec(dllexport)
#define KEYDLL3_API __declspec(dllexport)
#else
//否,则定义宏KEYDLL3_API 为__declspec(dllimport)
#define KEYDLL3_API __declspec(dllimport)
#endif__declspec(dllexport),__declspec(dllimport)是声明为导出还是导入函数。用于dll中。
2.The first param is the name of window class.