I'm attempting to zip a folder containing subfolders and items, using Windows shell CopyHere
command:
https://msdn.microsoft.com/en-us/library/windows/desktop/bb787866(v=vs.85).aspx https://msdn.microsoft.com/en-us/library/windows/desktop/ms723207(v=vs.85).aspx
Update: Note, prefer a native solution-- this is for a distributed Excel VBA tool, so bundling 3rd-party files is not ideal. And, need synchronous compression.
I can easily add a folder and its contents to the zip:
oShell.Namespace(sZipPath).CopyHere "C:\My Folder"
So we know CopyHere can process multiple objects inside a folder in 1 statement.
The problem is, the above command puts the containing-folder at the root of the zip, and it's contents inside of it. But, i don't want the containing folder-- just its contents.
The doc mentions a wildcard (option 128), but when i use a wildcard, i get an error:
oShell.Namespace(sZipPath).CopyHere "C:\My Folder\*"
The file name you specified is not valid or too long.
Perhaps there's a way to use my 1st command above, and then move the items in the zip to the root of the zip?
It would be acceptable to loop through each item in the source folder, adding one at a time to the zip. But, because CopyHere is asynchronous, each subsequent CopyHere fails if the previous CopyHere is not finished. None of the fixes work for this issue:
Comparing number of items in source-folder and destination-zip fail, because if the zip contains a folder, that counts as only 1 item (the items it contains are not counted. https://stackoverflow.com/a/16603850/209942
Waiting a while between each item works, but a timer is unacceptable: it's arbitrary. I cannot guess in advance the size or compress-time of each object.
Checking to see if the zip is locked for access failed for me. If I block my loop until the file is not locked, I still get a file-access error. https://stackoverflow.com/a/6666663/209942
Function FileIsOpen(sPathname As String) As Boolean ' true if file is open
Dim lFileNum As Long
lFileNum = FreeFile
Dim lErr As Long
On Error Resume Next
Open sPathname For Binary Access Read Write Lock Read Write As #lFileNum
lErr = Err
Close #lFileNum
On Error GoTo 0
FileIsOpen = (lErr <> 0)
End Function
Update: VBA can call shell commands synchronously (instead of creating a shell32.shell
object in VBA), so if CopyHere works on command-line or PowerShell, that could be the solution. Investigating...