I've seen this question: Selecting a directory with TOpenDialog
Which technically is NOT answered (OP asked SPECIFICALLY about TOpenDialog - not TFileOpenDialog) but is applicable to later versions of Delphi.
I'm using Delphi 7 so TFileOpenDialog is not available.
So is it possible to use TOpenDialog to select a folder?
I know about SelectDirectory and have seen the other postings on that and I also know about BrowseFolder.
I am ONLY interested in answers that pertain to TOpenDialog.
I tried setting the Filename property to '*.' as someone suggested somewhere but that doesn't work.
I've seen this question: Selecting a directory with TOpenDialog
Which technically is NOT answered
It is, well in one of the comments anyway:
"TFileOpenDialog != TOpenDialog ... TOpenDialog doesn't have such an option"
That is the answer.
I'm using Delphi 7 so TFileOpenDialog is not available.
No, it is not. However, the underlying IFileDialog and IFileOpenDialog interfaces that it uses internally are standard Win32 COM interfaces (on Vista+ only), and as such they can be used in Delphi 7 just fine, as long as you have their declarations in your code.
So is it possible to use TOpenDialog to select a folder?
The short answer is NO.
In Delphi 7, TOpenDialog is just a wrapper for the Win32 API GetOpenFileName() function, which can only select and return files, not folders. You must use SelectDirectory() (which is just a wrapper for the Win32 API SHBrowseForFolder() function if you use the newer overload), or IFileDialog/IFileOpenDialog with the FOS_PICKFOLDERS option enabled.
In modern versions of Delphi, TOpenDialog does delegate to IFileDialog/IFileOpenDialog on Vista+ whenever possible (theming enabled, not using old VCL features that not expose by the newer dialog, etc), but it does not enable the FOS_PICKFOLDERS option.