Win32 创建窗口翻车记录

今天创建窗口的时候,在捕获消息WM_CREATE的时候翻车了,找了好久都没找到,我换另一台电脑上又没出问题,

现分享下:LRESULT QWnd::WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam{    if (WM_CREATE == uMsg)

    {
        //就是这里,在创建的时候传进来一个this指针,我给写成了
        //QWnd* pWnd = (QWnd*)(LPCREATESTRUCT)lParam;
        //我晕了好久,
        QWnd* pWnd = (QWnd*)((LPCREATESTRUCT)lParam)->lpCreateParams;
        if (pWnd)//所以这样判断是不全的,应该再想个办法
        {
            pWnd->m_hWnd = hWnd;
            SetWindowLongPtr(hWnd, GWL_USERDATA, (LONG)pWnd);
        }
    }
    QWnd* pWnd = (QWnd*)GetWindowLongPtr(hWnd, GWL_USERDATA);
    if (pWnd)
    {
        const MSGSTRUCT* pMs = pWnd->FindMsg(uMsg,wParam);
        if (pMs != NULL)
        {
            return (pWnd->*(pMs->pfn))(wParam, lParam);
        }

    }
    return DefWindowProc(hWnd, uMsg, wParam, lParam);
}   

老是出现访问冲突,又找不到哪冲突.晕死了半天.