internal static string GetItemToolTipText(IntPtr hwnd, IntPtr hwndToolTip, int item)
{
if (hwndToolTip != IntPtr.Zero)
{
// We've found the tooltip window, so we won't need to scan for it.
// Got a tooltip window - use it.
NativeMethods.TOOLINFO tool = new NativeMethods.TOOLINFO();
tool.Init(Marshal.SizeOf(typeof(NativeMethods.TOOLINFO)));
tool.hwnd = hwnd;
tool.uId = item;
return XSendMessage.GetItemText(hwndToolTip, tool);
}
else
{
// Control doesn't know its tooltip window - instead scan for one...
// Enum the top-level windows owned by this thread...
uint processId;
uint threadId = GetWindowThreadProcessId(hwnd, out processId);
UnsafeNativeMethods.ENUMTOOLTIPWINDOWINFO info = new UnsafeNativeMethods.ENUMTOOLTIPWINDOWINFO();
info.hwnd = hwnd;
info.id = item;
info.name = "";
UnsafeNativeMethods.EnumThreadWndProc enumToolTipWindows = new UnsafeNativeMethods.EnumThreadWndProc(EnumToolTipWindows);
GCHandle gch = GCHandle.Alloc(enumToolTipWindows);
UnsafeNativeMethods.EnumThreadWindows(threadId, enumToolTipWindows, ref info);
gch.Free();
return info.name;
}
}
// ------------------------------------------------------
//
// Private Methods
//
// ------------------------------------------------------
#region Private Methods
private static bool EnumToolTipWindows(IntPtr hwnd, ref UnsafeNativeMethods.ENUMTOOLTIPWINDOWINFO lParam)
{
// Use ProxyGetClassName here instead of GetClassName(),
// since for a [....] tooltip the latter will return
// "WindowsForms10.tooltips_class32.app.0.b7ab7b".
// Instead, ProxyGetClassName uses WM_GETOBJECT with
// OBJID_QUERYCLASSNAMEIDX, which will return the correct answer.
if (!ProxyGetClassName(hwnd).Equals("tooltips_class32"))
{
return true;
}
NativeMethods.TOOLINFO tool = new NativeMethods.TOOLINFO();
tool.Init(Marshal.SizeOf(typeof(NativeMethods.TOOLINFO)));
// For tooltips with ids of 0, MFC will create the tooltip with the flag of TTF_IDISHWND.
// TTF_IDISHWND indicates that the uId member is the window handle to the tool.
if (lParam.id == 0)
{
tool.hwnd = Misc.GetParent(lParam.hwnd);
tool.uId = unchecked((int)lParam.hwnd);
tool.uFlags = NativeMethods.TTF_IDISHWND;
}
else
{
tool.hwnd = lParam.hwnd;
tool.uId = lParam.id;
}
string name = XSendMessage.GetItemText(hwnd, tool);
// Didn't get anything - continue looking...
if (string.IsNullOrEmpty(name))
{
return true;
}
lParam.name = name;
// Got it - can stop iterating now.
return false;
}