Tooltip display fails

[yuenqi]

void CMyToolTip::InitToolTip(HWND hParentWnd)
{
    if(m_toolTip.m_hWnd)
    {
        m_toolTip.Create(CWnd::FromHandle(hParentWnd),WS_POPUP|TTS_BALLOON);
        m_toolTip.Activate(FALSE);
    }
}

void CMyToolTip::SetToolTipText(LPCTSTR lpToolTipTxt, HWND hParentWnd, BOOL bActivate)
{
    if(NULL==lpToolTipTxt) return;
    InitToolTip(hParentWnd);
    if(0==m_toolTip.GetToolCount())
    {
        CRect rcPic; 
        ::GetClientRect(hParentWnd,&rcPic);
        m_toolTip.AddTool(CWnd::FromHandle(hParentWnd), lpToolTipTxt, &rcPic,1);
    }
    m_toolTip.Activate(bActivate);
    m_toolTip.UpdateTipText(lpToolTipTxt,CWnd::FromHandle(hParentWnd),1);
} 

I have tried the above code to display a balloon tooltip when my mouse is over the picture control but it doesn't show me anything at all. Could you help me ?

Thanks

[CoolPG]

Picture control? are you refering to a canvas control or Any other like a Bitmap blittted on Static or so??

Anyways, you've defined the function, and it seems Okay for me.... (I havent compiled)..

You should need to display the Tooltip, when a Mousehover is occured on the Picture('s) Control.. right?

If so, you should have to Call this function from the WM_MOUSEHOVER mesage handler of the Picture('s) Control

[yuenqi]

static control that is to hold a bitmap with frame/etch/bitmap etc or say a bitmap control

I have declared a variable m_pic and I get the handle to this bitmap easily m_pic.hWnd hehehe
Handling mouse messages is fine, only the tooltip doesn't show up and I am really LONG long for it.

What is wrong ?

[Marc G]

Check your if statement in your InitToolTip.

[yuenqi]

Thanks I see m_hWnd=0x0000000
How should I fix this ?

[Marc G]

Your "m_toolTip.Create" creates the tooltip, so you want something like:

void CMyToolTip::InitToolTip(HWND hParentWnd) 
{ 
    if(!m_toolTip.m_hWnd) 
    { 
        m_toolTip.Create(CWnd::FromHandle(hParentWnd),WS_POPUP|TTS_BALLOON); 
        m_toolTip.Activate(FALSE); 
    } 
}

[yuenqi]

Sorry,
if(!m_toolTip.m_hWnd)
was what I had in my original source code, the above snip was copied incorrectly. I dont see the balloon display when mouse is over. I don't know why.

[Marc G]

Can you post a small demo project with the problem? Remove temporary files.

[yuenqi]

I will send you in email Ok ? no other information except deed for help on this problem is included

[Marc G]

ok, but why not post it on the forum, so other members might also take a look at it?

[yuenqi]

Ok, I will but not now, because I am very far away from home and I don't have the source code included in my usb to extract up here.

Later!

[Marc G]

One other thing, did you add a call to RelayEvent?
Something along the lines like:

BOOL CMyDialog::PreTranslateMessage(MSG* pMsg)
{
	m_toolTip.RelayEvent(pMsg);

	return CWnd::PreTranslateMessage(pMsg);
}

[yuenqi]

Thank you very much for your help
But I have to tell you that your help is yet to be sufficient to make the program work. I have to save my class's handle for use in my dialog. That is 1:1 I mean.