Tooltip is not coming for a control - c++

Question

One of my application is ported from windows Xp to WIN7. For this application tool tip control is not working in win7 while it is working for XP.
Code logic:
We are setting tooltip in a const string. aToolTipText =anImageTypeStr;
and passing in a function SetToolTipText(LPCTSTR tooltiptext, long Id) which is calling ActivateToolTipText(int Id, bool activateFlag) which is actually handling Tooltip based on id.
bool ActivateToolTipText(int Id, bool activateFlag)
{
CSA_TRY
{
// struct specifying info about tool in ToolTip control
TOOLINFO ti;
unsigned int uid = Id; // for ti initialization
LPTSTR lptstr = (LPTSTR)(LPCTSTR)m_strToolTipText[Id];
// CREATE A TOOLTIP WINDOW
if(activateFlag)
{
m_ToolTipHWND[Id] = CreateWindowEx(WS_EX_TOPMOST,
TOOLTIPS_CLASS,
NULL,
WS_POPUP | TTS_NOPREFIX | TTS_ALWAYSTIP,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
m_hWnd,
NULL,
0,
NULL
);
}
// INITIALIZE MEMBERS OF THE TOOLINFO STRUCTURE
ti.cbSize = sizeof(TOOLINFO);
ti.uFlags = TTF_SUBCLASS ;
ti.hwnd = m_hWnd;
ti.hinst = 0;
ti.uId = uid;
ti.lpszText = lptstr;
// ToolTip control will cover the rect of Id
CRect rect_out;
GetIdArea(Id, &rect_out);
ti.rect = rect_out;
if( activateFlag )
::SendMessage(m_ToolTipHWND[Id], TTM_ADDTOOL, 0, (LPARAM) (LPTOOLINFO)&ti);
}
else
{
::SendMessage(m_ToolTipHWND[Id], TTM_DELTOOL, 0, (LPARAM) (LPTOOLINFO) &ti);
}
return TRUE;
}
}

Answer 1

The problem is with common controls version 6. for xp+, the header file CommCtrl.h assume we will use comctl version 6, but if we dont enable it explictly with manifest file, we'll still use the old comctl version 5.x. problem starts here, the size of TOOLINFO of version 5.x is different to version 6.x. So if you need to use comctl version 5 under windows xp+, you should init TOOLINFO with follwing code, TOOLINFO ti; ti.cbSize = sizeof(TOOLINFO) - 4;