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From: Woody on 1 Jun 2010 03:14
I have moved a project from VS6 to VS2005. The app is an MFC dialog,
with tracking tooltips in a list control. When the app was built in
VS6, the tracking tooltips performed as expected, but when the app is
built in VS2005, no tooltips appear. I cannot figure out why this is
happening, and would appreciate some advice.

Here is the code, same in both VS6 and VS2005:

Creation of the tooltip, CToolTipCtrlEx:
// Set up the tooltip which will display variable values in the list
control
toolTipCtrl.Create(this,TTS_ALWAYSTIP);
toolTipCtrl.AddWindowTool(&pgmCtrl,LPSTR_TEXTCALLBACK); // tooltip
will not show until activated
toolTipDisplayed=false;
toolInfo.cbSize = sizeof (TOOLINFO); // set up the stuff needed for
message processing
toolInfo.hwnd = this->m_hWnd;
toolInfo.uId = (UINT) pgmCtrl.m_hWnd;

In PreTranslateMessage, the tooltip is activated and its position set
when we are within the list control:
if(pMsg->message==WM_MOUSEMOVE)
{
if(pMsg->hwnd==pgmCtrl.m_hWnd) // mouse move within list control
{
if(!toolTipDisplayed)
{
::SendMessage (toolTipCtrl.m_hWnd,TTM_TRACKACTIVATE,
(WPARAM)TRUE, (LPARAM) &toolInfo);
// Above message is sent in both VS6 and VS2005
}
::SendMessage(toolTipCtrl.m_hWnd,TTM_TRACKPOSITION,0,(LPARAM)
(DWORD) MAKELONG(pMsg->pt.x+15, pMsg->pt.y-15));
toolTipPos=pMsg->pt;
}
else // mouse move outside list control
{
if(toolTipDisplayed)
{
::SendMessage (toolTipCtrl.m_hWnd,TTM_TRACKACTIVATE,
(WPARAM)FALSE, (LPARAM) &toolInfo);
toolTipDisplayed=false;
}
}
}
return CDialog::PreTranslateMessage(pMsg);

Here is where we should come when the tooltip is to be displayed. In
VS2005, this is never reached; in VS6 it is.
BOOL CMasterDlg::OnNeedText( UINT id, NMHDR * pTTTStruct, LRESULT *
pResult )
{
....
}

In class CToolTipCtrlEx (adapted from Proise):

BOOL CToolTipCtrlEx::AddWindowTool (CWnd* pWnd, LPCTSTR pszText)
{
TOOLINFO ti;
ti.cbSize = sizeof (TOOLINFO);
ti.uFlags = TTF_IDISHWND | TTF_TRACK | TTF_ABSOLUTE;
ti.hwnd = pWnd->GetParent ()->GetSafeHwnd ();
ti.uId = (UINT) pWnd->GetSafeHwnd ();
ti.hinst = AfxGetInstanceHandle ();
ti.lpszText = (LPTSTR) pszText;

return (BOOL) SendMessage (TTM_ADDTOOL, 0, (LPARAM) &ti);
}

I noticed someone's post suggesting that there might be a mismatch
between commctrl.dll and WINVER, so I also tried using the older
TOOLINFO (v2) structure, but that didn't make any difference. On my
both systems, WINVER=501.






From: Cameron_C on 1 Jun 2010 11:56
Hello Woody,
I am not sure if this will be helpful or not.
I use ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTA, 0, 0xFFFF,
OnGetToolTipTextForFinalizeButton) and ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTW, 0,
0xFFFF, OnGetToolTipTextForFinalizeButton)
For the ToolTips Needt Text messages.
I know aI spent a fair bit of effort to get this to work.

"Woody" wrote:

> I have moved a project from VS6 to VS2005. The app is an MFC dialog,
> with tracking tooltips in a list control. When the app was built in
> VS6, the tracking tooltips performed as expected, but when the app is
> built in VS2005, no tooltips appear. I cannot figure out why this is
> happening, and would appreciate some advice.
>
> Here is the code, same in both VS6 and VS2005:
>
> Creation of the tooltip, CToolTipCtrlEx:
> // Set up the tooltip which will display variable values in the list
> control
> toolTipCtrl.Create(this,TTS_ALWAYSTIP);
> toolTipCtrl.AddWindowTool(&pgmCtrl,LPSTR_TEXTCALLBACK); // tooltip
> will not show until activated
> toolTipDisplayed=false;
> toolInfo.cbSize = sizeof (TOOLINFO); // set up the stuff needed for
> message processing
> toolInfo.hwnd = this->m_hWnd;
> toolInfo.uId = (UINT) pgmCtrl.m_hWnd;
>
> In PreTranslateMessage, the tooltip is activated and its position set
> when we are within the list control:
> if(pMsg->message==WM_MOUSEMOVE)
> {
> if(pMsg->hwnd==pgmCtrl.m_hWnd) // mouse move within list control
> {
> if(!toolTipDisplayed)
> {
> ::SendMessage (toolTipCtrl.m_hWnd,TTM_TRACKACTIVATE,
> (WPARAM)TRUE, (LPARAM) &toolInfo);
> // Above message is sent in both VS6 and VS2005
> }
> ::SendMessage(toolTipCtrl.m_hWnd,TTM_TRACKPOSITION,0,(LPARAM)
> (DWORD) MAKELONG(pMsg->pt.x+15, pMsg->pt.y-15));
> toolTipPos=pMsg->pt;
> }
> else // mouse move outside list control
> {
> if(toolTipDisplayed)
> {
> ::SendMessage (toolTipCtrl.m_hWnd,TTM_TRACKACTIVATE,
> (WPARAM)FALSE, (LPARAM) &toolInfo);
> toolTipDisplayed=false;
> }
> }
> }
> return CDialog::PreTranslateMessage(pMsg);
>
> Here is where we should come when the tooltip is to be displayed. In
> VS2005, this is never reached; in VS6 it is.
> BOOL CMasterDlg::OnNeedText( UINT id, NMHDR * pTTTStruct, LRESULT *
> pResult )
> {
> ....
> }
>
> In class CToolTipCtrlEx (adapted from Proise):
>
> BOOL CToolTipCtrlEx::AddWindowTool (CWnd* pWnd, LPCTSTR pszText)
> {
> TOOLINFO ti;
> ti.cbSize = sizeof (TOOLINFO);
> ti.uFlags = TTF_IDISHWND | TTF_TRACK | TTF_ABSOLUTE;
> ti.hwnd = pWnd->GetParent ()->GetSafeHwnd ();
> ti.uId = (UINT) pWnd->GetSafeHwnd ();
> ti.hinst = AfxGetInstanceHandle ();
> ti.lpszText = (LPTSTR) pszText;
>
> return (BOOL) SendMessage (TTM_ADDTOOL, 0, (LPARAM) &ti);
> }
>
> I noticed someone's post suggesting that there might be a mismatch
> between commctrl.dll and WINVER, so I also tried using the older
> TOOLINFO (v2) structure, but that didn't make any difference. On my
> both systems, WINVER=501.
>
>
>
>
>
>
> .
>
From: Woody on 1 Jun 2010 14:07
On Jun 1, 8:56 am, Cameron_C <Camer...(a)discussions.microsoft.com>
wrote:
> I am not sure if this will be helpful or not.
> I use ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTA, 0, 0xFFFF,
> OnGetToolTipTextForFinalizeButton)

It was extremely helpful. Armed with this hint, I experimented and
discovered that my original code worked fine if I changed my message
map entry from

ON_NOTIFY_EX(TTN_NEEDTEXT, IDC_ListCtrl, OnNeedText)
to
ON_NOTIFY_EX(TTN_NEEDTEXT ,0, OnNeedText)

In other words, the notification doesn't include the control's ID. I
have no idea why this works. You example included both Unicode and
ASCII messages, and all possible IDs, which I narrowed down to just
what I needed.

BTW, apparently the reason it worked in VS6 was that the message map
entry there was

ON_NOTIFY_EX(TTN_NEEDTEXT, NULL, OnNeedText)

but this doesn't work in VS2005.

From: Cameron_C on 2 Jun 2010 10:26
Woody,
I am happy that you worked this one out.


"Woody" wrote:

> On Jun 1, 8:56 am, Cameron_C <Camer...(a)discussions.microsoft.com>
> wrote:
> > I am not sure if this will be helpful or not.
> > I use ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTA, 0, 0xFFFF,
> > OnGetToolTipTextForFinalizeButton)
>
> It was extremely helpful. Armed with this hint, I experimented and
> discovered that my original code worked fine if I changed my message
> map entry from
>
> ON_NOTIFY_EX(TTN_NEEDTEXT, IDC_ListCtrl, OnNeedText)
> to
> ON_NOTIFY_EX(TTN_NEEDTEXT ,0, OnNeedText)
>
> In other words, the notification doesn't include the control's ID. I
> have no idea why this works. You example included both Unicode and
> ASCII messages, and all possible IDs, which I narrowed down to just
> what I needed.
>
> BTW, apparently the reason it worked in VS6 was that the message map
> entry there was
>
> ON_NOTIFY_EX(TTN_NEEDTEXT, NULL, OnNeedText)
>
> but this doesn't work in VS2005.
>
> .
>
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