VC++.进程顶层窗口2

HWND GetProcessTopWnd2(IN DWORD dwPid)
{
    HWND ret = 0;
    try
    {
        DWORD dwEnumPid = 0;
        HWND hEnumWnd = GetTopWindow(0);
        while (hEnumWnd)
        {
            ::GetWindowThreadProcessId(hEnumWnd, &dwEnumPid);
            if (dwPid == dwEnumPid)
            {
                LONG lStyle = ::GetWindowLong(hEnumWnd, GWL_STYLE);
                if ((lStyle & WS_VISIBLE) && (GetParent(hEnumWnd) == 0)) /*顶层可见窗口*/
                {
                    ret = hEnumWnd;
                    break;
                }
            }
            hEnumWnd = GetWindow(hEnumWnd, GW_HWNDNEXT);
        }
    }
    catch (...)
    {
        OutputDebugStringA(__FUNCTION__);
    }
    return ret;
}

int main()
{
    STARTUPINFO si = { 0 };
    si.cb = sizeof(si);
    PROCESS_INFORMATION pi = { 0 };
    BOOL b = CreateProcess(_T("C:\\Using\\winmine.exe"), 0, 0, 0, 0, 0, 0, 0, &si, &pi);
    HWND h = 0;
    if (b)
    {
        for (int i = 0; i < 5 && !h; ++i)
        {
            h = GetProcessTopWnd2(pi.dwProcessId);
            Sleep(1000);
        }
        printf("%d %08X \r\n", h, h);
    }

    return 0;
}