Example: Opening an existing ISO

This example will show how to examine an existing ISO. Here’s the complete code for this example:

import sys
import pycdlib

iso = pycdlib.PyCdlib()
iso.open(sys.argv[1])

for child in iso.list_children(iso_path='/'):
    print(child.file_identifier())

iso.close()

Let’s take a closer look at the code.

import sys
import pycdlib

As we’ve seen before, import pycdlib. We also import the sys module so we get access to the command-line arguments.

iso = pycdlib.PyCdlib()
iso.open(sys.argv[1])

As we saw in the last example, create a new PyCdlib object. Once we have the object, we can then open up the file passed on the command-line. During the open, PyCdlib will parse all of the metadata on the ISO, so if the file is coming over a network, this may take a bit of time. Note that besides the open method, there is also an open_fp method that takes an arbitrary file-like object.

for child in iso.list_children(iso_path='/'):
    print(child.file_identifier())

Use the list_children API from PyCdlib to iterate over all of the files and directories at the root of the ISO. As discussed in the Creating a new, basic ISO example, the paths are Unix-like absolute paths.

iso.close()

Close out the PyCdlib object, releasing all resources and invalidating the contents. After this call, the object can be reused to create a new ISO or open up an existing ISO.

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