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正在阅读:C宏--智者的利刃,愚者的恶梦C宏--智者的利刃,愚者的恶梦

2005-09-01 10:02 出处: 作者:乾坤一笑 责任编辑:moningfeng

  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。
键盘也能翻页,试试“← →”键

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