Question

I have a .zip file that starts with a parent directory. I need to read that dir from the file then search my HD to see if that dir name already exists. If it exists, I then delete it and replace it the contents of the .zip file.

All of this I can do, except read the .zip without actually unzipping the file.

The .zip file can be upwards of 2G in size so I want to avoid unzipping, then reading the dir, then copying.

The reason I don’t just unzip directly to the location and force an overwrite is that for some reason when using the CopyHere method to unzip, it ignores the switches that would normally force the overwrite and still prompts the user if they want to overwrite.

Code to unzip files:

 Set objSA = CreateObject("Shell.Application")
 Set objSource = objSA.NameSpace(pathToZipFile).Items ()
 Set objTarget = objSA.NameSpace(extractTo)     

 objTarget.CopyHere objSource,4

Answer 1

Assuming that you can use an external application, try downloading 7Zip and then have your script execute it with the -l switch. This should give you some output that you should be able to parse in some way.

Sample from the help file: 7z l archive.zip