create a button control at run time in VC 5

Hi, Expert

I've successfully create some button controls at run-time.  However, I don't know how to add the message (ON_BUTTON_CLICK) mapping for these controls at the run-time. Normally, the message mapping is implemented by adding some code at message area like

BEGIN_MESSAGE_MAP(.....)
.....
END_MESSAGE_MAP()

However, since all these buttons are created at run time. It is no way to add in any definition in that area during the run time.

Please, give me some idea!
wzouAsked:
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galkinCommented:
When you create button control in runtime you pass UINT number in last parameter in CButton::Create function. This is ID of the button. Now if you want to add BN_CLICKED message handler to button parent class you need to insert the following macro
ON_BN_CLICKED(ID, OnButtonClicked) between BEGIN_MESSAGE_MAP and END_MESSAGE_MAP where ID is buton ID you pass as last parameter in CButton::Create. Then you must add OnButtonClicked function to button parent class declaration and function definition itself.
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wzouAuthor Commented:
Hi, galkin;

Thanks for the reply!
The problem run the program I don't know exactly how many Button Controls I will create. So, I have to assign the ID to the new Button Control at run time.  That's why I can't put the message mapping in the BEGIN_MESSAGE_MAP and END_MESSAGE_MAP at build time.
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galkinCommented:
In this case define macro ON_CONTROL_EX_RANGE as follows

#define ON_CONTROL_EX_RANGE(wNotifyCode, id, idLast, memberFxn) \
      { WM_COMMAND, (WORD)wNotifyCode, (WORD)id, (WORD)idLast, AfxSig_bw, \
            (AFX_PMSG)(void (AFX_MSG_CALL CCmdTarget::*)(UINT))&memberFxn },

to map range of button IDs to the single handler.
where memberFxn is defined as afx_msg BOOL memberFxn (UINT nID);
where nID is ID of the button sent notification message.
wNotifyCode is BN_CLICKED in your case
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wzouAuthor Commented:
Hi galkin,

It seems to be a good idea. I will test it.

Tanks for your help!


Wei Zou
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