限制目录与GetOpenFileName（） [英] limit directory with GetOpenFileName()

问题描述

我知道Microsoft建议使用 GetOpenFileName（）和 GetSaveFileName（）的公共项目对话框，但我

如何限制 GetOpenFileName（）只允许用户选择文件在某个目录中？

例如，我只希望用户能够从Images目录中选择一个文件。我不希望他们在打开文件时能够导航到其他目录。他们必须从Images目录中选择一个文件。

标志 OFN_NOCHANGEDIR 听起来像是我需要的，

如果不能使用 GetOpenFileName（）

GetOpenFileName（）可以使用新的Common Item对话框

解决方案

和 GetSaveFileName（），您可以将分配一个回调过程到 OPENFILENAME :: lpfnHook 领域。当它收到 CDN_FILEOK 通知，通过发送对话框检索所选文件夹 CDM_GETFOLDERPATH 消息。如果您不能接受该文件夹，请向用户显示一条消息，然后通过调用 SetWindowLong（）来拒绝所选文件，以将非零值设置为 DWL_MSGRESULT 值，并从钩子过程返回非零值。





更新 $ c> IFileOpenDialog 和 IFileSaveDialog ，您可以实现 IFileDialogEvents :: OnFolderChanging 事件回调以防止导航到不需要的文件夹，错误 HRESULT 除以外的值S_OK 或 E_NOTIMPL p>

I know that Microsoft recommends using the Common Item Dialog boxes over GetOpenFileName() and GetSaveFileName() but I am working with some older code.

How can I limit GetOpenFileName() to only allow the user to select files in a certain directory?

For example, I only want the user to be able to select a file from the "Images" directory. I don't want them to be able to navigate into other directories when opening a file. They must select a file from the "Images" directory.

The flag OFN_NOCHANGEDIR sounds like it could be what I need, but that just changes the current directory back to the original directory if the user changes it when opening a file.

If it's not possible with GetOpenFileName(), is it possible with the newer Common Item Dialog?

解决方案

For GetOpenFileName() and GetSaveFileName(), you can assign a callback procedure to the OPENFILENAME::lpfnHook field. When it receives a CDN_FILEOK notification, retrieve the selected folder by sending the dialog a CDM_GETFOLDERPATH message. If the folder is not acceptable to you, display a message to the user and then reject the selected file(s) by calling SetWindowLong() to set a nonzero DWL_MSGRESULT value, and return a nonzero value from the hook procedure.

Update: for IFileOpenDialog and IFileSaveDialog, you can implement the IFileDialogEvents::OnFolderChanging event callback to prevent navigation to unwanted folders, by simply returning an error HRESULT value other than S_OK or E_NOTIMPL.

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