正在阅读：实用!超强VC/MFC 常见问答收集实用!超强VC/MFC 常见问答收集

2004-07-15 10:04 出处：CSDN 作者：jiangsheng收集责任编辑：linjixiong

    CWnd m_ax;
    LPCTSTR pszName = "MSDBGrid.DBGrid";
                     //控件的ProgID ，这里我用的是DBGrid32.ocx
    m_ax.CreateControl (pszName,NULL, WS_VISIBLE | WS_CHILD,
CRect(100,100,200,200), this, AFX_IDW_PANE_FIRST);
    m_ax.ShowWindow(SW_SHOW);

CView::OnRButtonDown(nFlags, point);
}

想要实现的功能是：在View中右键单击动态创建DBGrid.ocx控件的子窗体，通过调试发现没有问题，创建成功，但就是不能将创建的控件显示出来。

最奇怪的是，如果我在m_ax.ShowWindow(SW_SHOW);之后加上一句 AfxMessageBox("hehe");创建的子窗体居然能显示出来了，请高手指点，这到底是怎么回事啊？应该怎么解决？多谢
答：CWnd::~CWnd会调用DestroyWindow。将CWnd m_ax；不定义为局部变量就ok了！

问：在ACTIVEX中开线程，是用_beginthreadEx还是用Afxbeginthread
我在线程中用到了不少c runtime 的函数，如strlen等等。按照道理似乎应该使用beginthreadEx，但是我的activex是用MFC开发的，这样按照道理，似乎又应该使用Afxbeginthread。还有，如果我在项目设置里选择不使用mfc，整个程序正常运行。请问我到底该使用哪个函数。
beginthreadEx启动的线程中不使用MFC就没问题。否则还是用MFC的Afxbeginthread吧。MFC里面大把的函数引用线程局部存储的。

问：如何对基于对话框的MFC应用程序加入Accelerator，我已经添加了Accelerator资源，却没有作用
答：Q222829 HOWTO: Using Accelerator Keys Within a Modal Dialog Box
http://support.microsoft.com?kbid=222829
问：如何在文件夹浏览对话框中只显示映射文件夹
答：SHGetSpecialFolderLocation/CSIDL_DRIVES
Custom Filtering
Under Microsoft® Windows® XP, SHBrowseForFolder supports custom filtering on the contents of the dialog box. To create a custom filter, follow these steps:

Set the BIF_NEWDIALOGSTYLE flag in the ulFlags member of the BROWSEINFO parameter structure.
Specify a callback function in the lpfn member of the BROWSEINFO parameter structure.
The callback function will receive BFFM_INITIALIZED and BFFM_IUNKNOWN messages. On receipt of the BFFM_IUNKNOWN message, the callback function's LPARAM parameter will contain a pointer to an instance of IUnknown. Call QueryInterface on that IUnknown to obtain a pointer to an IFolderFilterSite interface.
Create an object that implements IFolderFilter.
Call IFolderFilterSite::SetFilter, passing it a pointer to IFolderFilter. IFolderFilter methods can then be used to include and exclude items from the tree.
Once the filter is created, the IFolderFilterSite interface is no longer needed. Call IFolderFilterSite::Release if you have no further use for it.