(续上)例三、用c宏，自动生成代码这方面的例子也是多得很，不过有鉴于很多朋友不用很多编译器，不做嵌入式的开发，我就举个win平台的例子吧。我们知道mfc实现了windows的消息映射，比如： on_command(idm_about, onabout)
on_command(idm_filenew, onfilenew)
　　它是如何实现的idm_about和onabout的关联的呢？这要用到几个宏。
#define declare_message_map() /
private: /
static const afx_msgmap_entry _messageentries[]; /
protected: /
static afx_data const afx_msgmap messagemap; /
virtual const afx_msgmap* getmessagemap() const; /
#define begin_message_map(theclass, baseclass) /
const afx_msgmap* theclass::getmessagemap() const /
{ return &theclass::messagemap; } /
afx_comdat afx_datadef const afx_msgmap theclass::messagemap = /
{ &baseclass::messagemap, &theclass::_messageentries[0] }; /
afx_comdat const afx_msgmap_entry theclass::_messageentries[] = /
{ /
#define on_command(id, memberfxn) /
{ wm_command, 0, (word)id, (word)id, afxsig_vv, (afx_pmsg)memberfxn },
#define end_message_map() /
{0, 0, 0, 0, afxsig_end, (afx_pmsg)0 } /
}; /
#define declare_message_map() /
private: /
static const afx_msgmap_entry _messageentries[]; /
protected: /
static afx_data const afx_msgmap messagemap; /
virtual const afx_msgmap* getmessagemap() const; /
#define begin_message_map(theclass, baseclass) /
const afx_msgmap* theclass::getmessagemap() const /
{ return &theclass::messagemap; } /
afx_comdat afx_datadef const afx_msgmap theclass::messagemap = /
{ &baseclass::messagemap, &theclass::_messageentries[0] }; /
afx_comdat const afx_msgmap_entry theclass::_messageentries[] = /
{ /
#define on_command(id, memberfxn) /
{ wm_command, 0, (word)id, (word)id, afxsig_vv, (afx_pmsg)memberfxn },
#define end_message_map() /
{0, 0, 0, 0, afxsig_end, (afx_pmsg)0 } /
}; /

　　嘿嘿，就这么几个宏，就构造出一个消息数组来.