问题
In Vista, I have been using an IFileSaveDialog to let users pick a "save-as" folder. Users export a folder of images, say, and need to choose a new or existing target folder.
Briefly, the code goes like this:
IFileSaveDialog* dialog; // created
dialog->SetOptions(FOS_PICKFOLDERS);
dialog->Show(NULL);
dialog->GetResult(&shellItem)
In Windows 7, the FOS_PICKFOLDERS option appears to have been disallowed (and is marked as such in the API). The return value on the SetOptions call is E_INVALIDARG. If I use a IFileOpenDialog, I'm allowed to set the folders option, but the user is prompted with an error when choosing a nonexistent folder (despite my setting flags suggesting not to do this).
Is there an alternate way to get the new IFileDialog to act as a "save folder" dialog?
[To head off some comments, the SHBrowseForFolder API still exists, but is still not an acceptable solution for our UI deciders.]
回答1:
The reason for this can be found in the documentation:
FOS_PICKFOLDERS: Present the Open dialog offering a choice of folders rather than files.
Using FOS_PICKFOLDERS for "Save" was never supposed to be supported but Vista didn't enforce it. Use IFileOpenDialog instead and you're good to go. You are picking an existing folder (not specifying a folder to create), so open was always the correct choice.
回答2:
I haven't played around with the Windows 7 dialogs yet, but downloaded the Windows® API Code Pack just this morning as I am implementing the Thumbnail Toolbar and Icon Overlay in the application I am working on. It'll probably point you in the right direction.
来源：https://stackoverflow.com/questions/1626993/ifilesavedialog-choosing-folders-in-windows-7