Zipping files without a third party library

[jj2007]

Globally shared memory is always problem for that kind of interfaces.

Do you have a link explaining the problem? My suspicion is that with CLSCTX_INPROC_SERVER the memory is local to the process; and I do not see any increase of the working set when not releasing the IShellDispatch interface.

[TimoVJL]

Is IShellDispatch interface capable to serve CLSCTX_INPROC_SERVER at all ?
Just too big interface with too many features ?

[jj2007]

Is IShellDispatch interface capable to serve CLSCTX_INPROC_SERVER at all ?

Well, zipping works fine, so obviously it is capable ;-)

[jj2007]

Google groups, Dec 4, 2007:

However, if there is an empty subdirectory I receive the following error
"The specified directory c:\temp\vbe is empty, so compressed (zipped) folders
cannot add it to the archive.

I tested this by adding an empty folder and using this code:

Code Select Expand

include \masm32\MasmBasic\MasmBasic.inc
  Init
  Dim Files$() ; redim to empty the Files$() array
  Let Files$(0)="\Masm32\examples\threads"
  ZipFiles "ThreadsTest.zip" ; create zip archive
  ShEx "ThreadsTest.zip" ; open it
EndOfCode
Result: no problem, ZipFiles doesn't complain but you'll see the empty folder in the archive.

Windows internals from the same post:

WenYuan Wang [MSFT]
unread,
Dec 7, 2007, 8:49:09 AM
to
Hello Rds,
Thanks for your reply.
I consulted shell team. Windows XP or above handles Zip files by
zipfldr.dll (which is located in %windir%\system32\zipfldr.dll). It's a
thrid party product. I'm sorry to say Microsoft doesn't provide any API to
compress Zip via zipfldr.dll.

The MSDN documentation you referenced about CopyHere method only applies to
normal file system path.It doesn't work for a zip file folder. That's why
you find the option 4 to disable the progress dialog doesn't help.It's by
desgin.

By the way, currently the zip file functionality is only meant to be used
with User Interaction. In other words, programmatically access to the zip
file NSE is not officially supported.

That was almost 16 years ago, and it seems it's still only unofficially supported. It works fine