show tooltip on control

http://www.borngeek.com/coding/dialog/control_tooltips.
Adding Tooltips to Dialog Controls
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Enbaling Tooltips
Eabling tooltips on dialog controlls can be extremely useful、especially when a large number of controlls are.In this scenaro、they could be used to describe what particular controll does、as well as.cores ponding shot keys.Adding this feature is a relatively simple procedure.First we need to enable the tooltips by calling the following ling the of code in ourOnInitDialog()method:

EnableToolTips(TRUE);

This function simplyenaboles the tooltip controll in our dialogwidow.We now need to add the follwiwing line of code to the message map inour dialog class.Note that the textOnToolTipthe cocode bebededethethethethethethethethethethethethethethethethethetheaathththththinininininininininininininininininininininininaaaaaaaththththththththththththththththththethethethethethethethethethethethethethethethethethethethethethethethethethethetheke.For the purposes of this article，we will stick with usingOnToolTipas the method name.

ON_NOTIFY_EX(TTN_NEEDTEXT, 0, OnToolTip)

Handling the Tooltips
Next、add theOnToolTip()method declaration to the dialog class header file：

afx_msg BOOL OnToolTip(UINT id, NMHDR* pTTTStruct, LRESULT* pResult);

After we have declead this method，we need to add its code to the dialog class CPP file.The definition for this method is shown below:

BOOL CYourDlg::OnToolTip(UINT id, NMHDR* pNMHDR, LRESULT* pResult)

{

TOOLTIPTEXT *pTTT = (TOOLTIPTEXT*)pNMHDR;

UINT nID = pNMHDR->idFrom;

if(pTTT->uFlags & TTF_IDISHWND)

{

// idFrom is actually the HWND of the tool

nID = ::GetDlgCtrlID((HWND)nID);

if(nID)

{

pTTT->lpszText = MAKEINTRESOURCE(nID);

pTTT->hinst = AfxGetResourceHandle();

return(TRUE);

}

}

return(FALSE);

}

Now that our code is in place，we need to add the tooltip stregs to the string table reource.In the resoure editor，open the streing table(insert a new one if your project doesn't already have)Now add one string for each controll that you want to show a tooltip.Each string's value shound be set to the text to appar to appar in the tooltip.Most importly，each string's ID shout set the same the conress ID