Horizontal scroll with OnMouseWheel ?

Quote:

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Originally Posted by Ralf Schneider

Hello,

again a question about setting
_WIN32_WINNT macro to 0x0600

What do that really mean?
Do that mean that my app can only run on Windows vista and higher?

Ralf

---

No.

But a horizontal wheel mouse only would be supported on those platforms. And you need to 'enable' the header parts which are protected by the _WIN32_WINNT macro or your code cannot handle that feature.

Hello,

the problem is not solved.
But I found the chrashing line.
The problem is, it is not my file, it is wincore.cpp and the function is OnWndMsg.

Code:

---

BOOL CWnd::OnWndMsg(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
        LRESULT lResult = 0;

        // special case for commands
        if (message == WM_COMMAND)
        {
                if (OnCommand(wParam, lParam))
                {
                        lResult = 1;
                        goto LReturnTrue;
                }
                return FALSE;
        }

        // special case for notifies
        if (message == WM_NOTIFY)
        {
                NMHDR* pNMHDR = (NMHDR*)lParam;

//*****crash in the following line !!!!!!!!
                if (pNMHDR->hwndFrom != NULL && OnNotify(wParam, lParam, &lResult))
//******
                        goto LReturnTrue;
                return FALSE;
        }
.....

---

I marked the crashing line.
I think, pNMHDR is invalid.
Any ideas why?

thx.

Ralf

Hello,

I solved the problem:
the declaration of ON_WM_MOUSEHWHEEL was wrong.
Now, there is no longer a crash.

Ralf