Not too sure if this applies to BlitzPlus, but in Blitz3d you would use FileType and check for a return value of 2.
You can also use ReadDir and NextFile to sequence through all the files and directories in a directory.
eg. (Blitz3D code)
; ReadDir/NextFile$/CloseDir example
; Define what folder to start with ...
folder$="C:"
; Open up the directory, and assign the handle to myDir
myDir=ReadDir(folder$)
; Let's loop forever until we run out of files/folders to list!
Repeat
; Assign the next entry in the folder to file$
file$=NextFile$(myDir)
; If there isn't another one, let's exit this loop
If file$="" Then Exit
; Use FileType to determine if it is a folder (value 2) or a file and print results
If FileType(folder$+"\"+file$) = 2 Then
Print "Folder:" + file$
Else
Print "File:" + file$
End If
Forever
; Properly close the open folder
CloseDir myDir
; We're done!
Print "Done listing files!"
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