对话框内控件更新

afxpriv.h has a message, WM_KICKIDLE, that is sent during idle processing. To get dialogs to work with the ON_UPDATE_COMMAND_UI message maps, you need to trap the kick idle message and call UpdateDialogControls.

In a dalog class header, add the following in the message map:

afx_msg LRESULT OnKickIdle(WPARAM , LPARAM );
In the implementation file: 
#include <afxpriv.h>

 
In the message map add: 
ON_MESSAGE(WM_KICKIDLE, OnKickIdle)
Implement the function: 
LRESULT CMyDlg::OnKickIdle(WPARAM wParam, LPARAM lParam)
{
	UpdateDialogControls(this, FALSE);
	return 0;
}
I leave the bDisableIfNoHndler flag as FALSE so buttons without message map entries are not disabled. 
You can now use ON_UPDATE_COMMAND_UI message maps for enabling/disabling controls, setting static text, etc. 
It works really well when you have two or more radio buttons that enable/disable different groups of controls. Just have one OnUpdate... function for each group of controls that enables/disables depending on the radio button selected, use IsDlgButtonChecked. Then add a message map entry for each control. 
To use ON_UPDATE_COMMAND_UI in form views.
The kick idle message doesn't work in form views, but there's another message in afxpriv.h called WM_IDLEUPDATECMDUI, that does. 
In a form view class header, add the following in the message map: 
afx_msg LRESULT OnIdleUpdateCmdUI(WPARAM , LPARAM );
In the implementation file: 
#include <afxpriv.h>
In the message map add: 
ON_MESSAGE(WM_IDLEUPDATECMDUI, OnIdleUpdateCmdUI)
Implement the function: 
LRESULT CMyFormView::OnIdleUpdateCmdUI(WPARAM wParam, LPARAM)
{
	UpdateDialogControls(this, FALSE);
	return 0L;
}
ON_UPDATE_COMMAND_UI can now be used as described above. 
 
Form： http://www.codeguru.com/Cpp/W-D/dislog/commandui/