#if(CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
#include <windows.h>
#define KEY_DOWN(vk_code) (GetAsyncKeyState(vk_code) & 0x8000 ? 1 : 0)
#define KEY_UP(vk_code) (GetAsyncKeyState(vk_code) & 0x8000 ? 0 : 1)
#endif

#if(CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)    
if(KEY_DOWN(VK_DOWN))
{
    // do something
}
#endif