模仿MFC寻找消息响应函数指针的 核心 代码

typedef struct 
{
UINT nMessage;
UINT nCode;
UINT nID;
UINT nLastID;
UINT nSig;


int * p;
}TEST;
const TEST* AFXAPI
MyAfxFindMessageEntry(const TEST* lpEntry,
UINT nMsg, UINT nCode, UINT nID)
{
ASSERT(offsetof(TEST, nMessage) == 0);
ASSERT(offsetof(TEST, nCode) == 4);
ASSERT(offsetof(TEST, nID) == 8);
ASSERT(offsetof(TEST, nLastID) == 12);