计算MDI子窗口数,仅显示文件夹的打开对话框 < 窗口管理 > 1、我正在写一个 MFC 的多文档（MDI）应用。在父窗口中，我如何检查所有的MDI...

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计算MDI子窗口数,仅显示文件夹的打开对话框 < 窗口管理 > 1、我正在写一个 MFC 的多文档（MDI）应用。在父窗口中，我如何检查所有的MDI子窗口是否都已经关闭？如果都关闭了，那么我想在我的主窗口激活一个窗格。 2、我正在用 Visual Studio .NET 和 MFC 做一个程序。在我的程序里，用户要选择一个文件夹，并在其中拷贝文件。我可以调用 OpenFileDialog 让用户选择某个文件，但如何让打开对话框只显示文件夹呢？我见过好多安装程序给出的对话框里只显示文件夹，但我好像找不到这样的标志。-calculated MDI window for a few, only showed the folder open dialog lt; Window management gt; One, I was writing a Multiple Document MFC (MDI) applications. The father of the window, how can I check all the MDI window whether son have closure? If the closure of all, I think in my main window activated a pane. 2, I was with Visual Studio.NET and MFC do a procedure. In my programs, and users have to choose a folder, and copies of documents in which. I can call OpenFileDialog to allow users to select a file, but how to open the box only shows that folder? I have seen a lot of the installation process is limited to only the dialog box shown folder, but I do not like the signs.