VC++中出现:Parsing error:Expected"afx_msg".Input Line:"DECLARE_MESSAGE_MAP()"请问是什么意思啊
推荐回答(1个)
有时候在给程序的类添加消息响应或者虚函数的时候,会弹出“Parsing error:Expected "afx_msg",input line.......”
//{{AFX_MSG(CMyimageDoc)
public:
afx_msg void OnStart();
afx_msg void Onsavefile();
afx_msg void OnStop();
protected:
afx_msg void OnFileSaveAs();
afx_msg void OnFileSave();
afx_msg void OnOriginalimage();
afx_msg void Onopenfile();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
如果你想给CMyimageDoc类添加虚函数或者消息响应的话就会弹出"Parsing error:......",你打开ClassWizard也会弹出这种错误。如果你在View类里打开的ClassWizard弹出这种错误的话,需要查找到底是哪个类中出现了问题,只需要再没个类中点右键添加虚函数(或者消息响应)就能查找出来大地哪儿出现了问题。本例然后再需要改成
public:
//{{AFX_MSG(CLock_imageDoc)
afx_msg void OnStart();
afx_msg void Onsavefile();
afx_msg void OnStop();
afx_msg void OnFileSaveAs();
afx_msg void OnFileSave();
afx_msg void OnOriginalimage();
afx_msg void Onopenfile();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
再添加的话就会没问题了。ClassWizard也能顺利打开了。
还有一种是自己添加的消息,如
public:
//{{AFX_MSG(CLock_imageDoc)
afx_msg void OnStart();
afx_msg void Onsavefile();
afx_msg void OnStop();
afx_msg void OnFileSaveAs();
afx_msg void OnFileSave();
afx_msg void OnOriginalimage();
afx_msg void Onopenfile();
afx_msg void OnmyMessage(); ///////////自己添加的消息对应的消息响应
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
此时的ClassWizard也会弹出"Parsing error:......",此时值需要改成
public:
//{{AFX_MSG(CLock_imageDoc)
afx_msg void OnStart();
afx_msg void Onsavefile();
afx_msg void OnStop();
afx_msg void OnFileSaveAs();
afx_msg void OnFileSave();
afx_msg void OnOriginalimage();
afx_msg void Onopenfile();
//}}AFX_MSG
afx_msg void OnmyMessage(); ///////////自己添加的消息对应的消息响应(放在//}}AFX_MSG的外面才行)
DECLARE_MESSAGE_MAP()
这样就不会出问题了。
MFC中有一种特殊的注释,叫注释宏。注释宏一般由VC自动加入到你的代码中。它是为class wizard服务的,class wizard通过它来定位各种系统自动添加代码的添加位置。若要使用类向导添加成员变量和成员函数,则要保留注释宏;否则,必须手动添加。如果你把它删了,classwizad就不能自动生成代码了 。 你添加消息响应的时候是不是发现源代码里多了些代码??那些代码为什么会在那里出现?为什么不在别的文件里出现?就是因为那里有注释宏它要将代码生成在相应注释宏之间 。 (这个注释是让ClassWizard能够分辨出哪些代码是它生成的,哪些是你自己写的。你自己写的代码要在这个注释之外,这样ClassWizard再修改消息映射的时候就不会管你的代码了。新版本vc(vs)已经没有注释宏了。)
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