ASSERT((CWnd*)p == this);

我是编写了一个DLL的弹窗，然后MFC应用程序去调用就出现了这个问题： 

关于这个问题主要问题点在 ASSERT(pMap != NULL); ASSERT((CWnd*)p == this); // must be us

这两个问题在release版本的时候并不展现，但并不代表没有问题：

出问题的源码如下：

#ifdef _DEBUG

void CWnd::AssertValid() const

{

    if (m_hWnd == NULL)

        return; // null (unattached) windows are valid



    // check for special wnd??? values

    ASSERT(HWND_TOP == NULL); // same as desktop

    if (m_hWnd == HWND_BOTTOM)

        ASSERT(this == &CWnd::wndBottom);

    else if (m_hWnd == HWND_TOPMOST)

        ASSERT(this == &CWnd::wndTopMost);

    else if (m_hWnd == HWND_NOTOPMOST)

        ASSERT(this == &CWnd::wndNoTopMost);

    else

    {

        // should be a normal window

        ASSERT(::IsWindow(m_hWnd));



        // should also be in the permanent or temporary handle map

        CHandleMap* pMap = afxMapHWND();

        ASSERT(pMap != NULL);



        CObject* p=NULL;

        if(pMap)

        {

            ASSERT( (p = pMap->LookupPermanent(m_hWnd)) != NULL ||

                    (p = pMap->LookupTemporary(m_hWnd)) != NULL);

        }

        ASSERT((CWnd*)p == this); // must be us



        // Note: if either of the above asserts fire and you are

        // writing a multithreaded application, it is likely that

        // you have passed a C++ object from one thread to another

        // and have used that object in a way that was not intended.

        // (only simple inline wrapper functions should be used)

        //

        // In general, CWnd objects should be passed by HWND from

        // one thread to another. The receiving thread can wrap

        // the HWND with a CWnd object by using CWnd::FromHandle.

        //

        // It is dangerous to pass C++ objects from one thread to

        // another, unless the objects are designed to be used in

        // such a manner.

    }

}

#endif

 网上的资料大都说是多线程引起的，其实我没有多线程，只是有子窗口；只是MFC本身消息机制问题导致的，我的部分代码是这样写的：

代码里都是这种风格的，然后百思不得其解，仍然没有解决问题，实在没有办法了；最后对于窗口DLL又重新封装了一遍，类似这样：

重新编写之后就可以了！

来源：CSDN

作者：奥特曼VS怪兽

链接：https://blog.csdn.net/yuchu123456/article/details/104050012