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Question: I have a DLL written in Visual C++ 6.0. This DLL is used in a Visual Basic 6.0 application.

the function of this DLL is to provide the user with an imagemap and allow them to graphically select a region, and then select details for that specific region.

In Windows XP, this works fine, in Windows Vista it does not work at all and causes some serious issues with the program and painting on the Vista desktop.

here is the mouse button event:
void CGraphicCtrl::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default

KillTimer(0);

SetTimer(0, 750, NULL);


ClientToScreen(&point);

CBrush brushFill;
COLORREF cRefFill;
COLORREF cRefBackground;
COLORREF cRefBlue = RGB(0, 0, 255);
COLORREF cRefWhite = RGB(255,255,255);

CClientDC dc(NULL);

COLORREF cRefPixel = dc.GetPixel(point);

if(!m_bDragPaint)
{
if(cRefPixel == cRefBlue) // if this region is already selected
{
cRefFill=cRefWhite; // fill it with white to deselect it
cRefBackground=cRefBlue;

}
else
if(cRefPixel == cRefWhite) // if this region is not already selected
{
cRefFill = cRefBlue; // fill it with blue to select it
cRefBackground = cRefWhite;

}
else
MessageBeep(0xFFFFFFFF);
}
else // m_bDragPaint == TRUE
{
cRefFill = cRefBlue; // fill all areas with blue to activate them
cRefBackground = cRefWhite;

}

brushFill.CreateSolidBrush(cRefFill);
dc.SelectObject(&brushFill);

dc.ExtFloodFill(point.x, point.y , cRefBackground, FLOODFILLSURFACE );

#ifdef _DEBUG // PROGRAMMING: USE THIS TO FIND HOTSPOT FOR GRAPHIC
CString strBuffer;
strBuffer.Format("%i, %i\n", point.x, point.y);
TRACE0(strBuffer);
#endif

if(!m_bDragPaint)
{
if( !m_iGroupMode )
{
SetRegionAffected(dc);
}
else
{
SetGroupAffected(dc);
m_iGroupMode=FALSE;
}
}

ScreenToClient(&point);


if((nFlags & MK_CONTROL) && m_bDebugMode)
{
CPoint pointLower(99999, 99999);
CPoint pointUpper(-1, -1);

CString strMessage;

FindExtremeBounds(point - m_pt1, &pointUpper, &pointLower);

strMessage.Format("Arbitrary point (%i, %i); Upper bounds (%i, %i); Lower bounds (%i, %i);", point.x - m_pt1.x, point.y - m_pt1.y + GetScrollPos(SB_VERT),
pointUpper.x, pointUpper.y + GetScrollPos(SB_VERT),
pointLower.x, pointLower.y + GetScrollPos(SB_VERT) );

MessageBox(strMessage);
}



COleControl::OnLButtonDown(nFlags, point);
}

driverdownloads

>>>> i am not sure i understand what you are saying
You are calling the timer functions with a NULL argument where a HWND is required. Same applies to the CClientDC which normally takes a CWnd* as first pointer. I don't know whether it is the reason why it doesn't work on VISTA but itt is worth to firstly make it correct before looking further cause that isn't recommended for other Windows platforms either (even if it makes no problems there).